Sakurai/pdf.js
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pdf.js/pdf.js

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/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- /
/* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
"use strict";
var ERRORS = 0, WARNINGS = 1, TODOS = 5;
var verbosity = WARNINGS;
function log(msg) {
if (console && console.log)
console.log(msg);
else if (print)
print(msg);
}
function warn(msg) {
if (verbosity >= WARNINGS)
log("Warning: "+ msg);
}
function error(msg) {
throw new Error(msg);
}
function TODO(what) {
if (verbosity >= TODOS)
log("TODO: "+ what);
}
function malformed(msg) {
error("Malformed PDF: "+ msg);
}
function assert(cond, msg) {
if (!cond)
error(msg);
}
// In a well-formed PDF, |cond| holds. If it doesn't, subsequent
// behavior is undefined.
function assertWellFormed(cond, msg) {
if (!cond)
malformed(msg);
}
function shadow(obj, prop, value) {
Object.defineProperty(obj, prop, { value: value, enumerable: true });
return value;
}
function bytesToString(bytes) {
var str = "";
var length = bytes.length;
for (var n = 0; n < length; ++n)
str += String.fromCharCode(bytes[n]);
return str;
}
var Stream = (function() {
function constructor(arrayBuffer, start, length, dict) {
this.bytes = Uint8Array(arrayBuffer);
this.start = start || 0;
this.pos = this.start;
this.end = (start + length) || this.bytes.byteLength;
this.dict = dict;
}
constructor.prototype = {
get length() {
return this.end - this.start;
},
getByte: function() {
var bytes = this.bytes;
if (this.pos >= this.end)
return -1;
return bytes[this.pos++];
},
// returns subarray of original buffer
// should only be read
getBytes: function(length) {
var bytes = this.bytes;
var pos = this.pos;
var end = pos + length;
var strEnd = this.end;
if (!end || end > strEnd)
end = strEnd;
this.pos = end;
return bytes.subarray(pos, end);
},
lookChar: function() {
var bytes = this.bytes;
if (this.pos >= this.end)
return;
return String.fromCharCode(bytes[this.pos]);
},
getChar: function() {
var ch = this.lookChar();
if (!ch)
return ch;
this.pos++;
return ch;
},
skip: function(n) {
if (!n && !IsNum(n))
n = 1;
this.pos += n;
},
reset: function() {
this.pos = this.start;
},
moveStart: function() {
this.start = this.pos;
},
makeSubStream: function(start, length, dict) {
return new Stream(this.bytes.buffer, start, length, dict);
}
};
return constructor;
})();
var StringStream = (function() {
function constructor(str) {
var length = str.length;
var bytes = Uint8Array(length);
for (var n = 0; n < length; ++n)
bytes[n] = str.charCodeAt(n);
Stream.call(this, bytes);
}
constructor.prototype = Stream.prototype;
return constructor;
})();
var FlateStream = (function() {
const codeLenCodeMap = Uint32Array([
16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
]);
const lengthDecode = Uint32Array([
0x00003, 0x00004, 0x00005, 0x00006, 0x00007, 0x00008, 0x00009,
0x0000a, 0x1000b, 0x1000d, 0x1000f, 0x10011, 0x20013, 0x20017,
0x2001b, 0x2001f, 0x30023, 0x3002b, 0x30033, 0x3003b, 0x40043,
0x40053, 0x40063, 0x40073, 0x50083, 0x500a3, 0x500c3, 0x500e3,
0x00102, 0x00102, 0x00102
]);
const distDecode = Uint32Array([
0x00001, 0x00002, 0x00003, 0x00004, 0x10005, 0x10007, 0x20009,
0x2000d, 0x30011, 0x30019, 0x40021, 0x40031, 0x50041, 0x50061,
0x60081, 0x600c1, 0x70101, 0x70181, 0x80201, 0x80301, 0x90401,
0x90601, 0xa0801, 0xa0c01, 0xb1001, 0xb1801, 0xc2001, 0xc3001,
0xd4001, 0xd6001
]);
const fixedLitCodeTab = [Uint32Array([
0x70100, 0x80050, 0x80010, 0x80118, 0x70110, 0x80070, 0x80030,
0x900c0, 0x70108, 0x80060, 0x80020, 0x900a0, 0x80000, 0x80080,
0x80040, 0x900e0, 0x70104, 0x80058, 0x80018, 0x90090, 0x70114,
0x80078, 0x80038, 0x900d0, 0x7010c, 0x80068, 0x80028, 0x900b0,
0x80008, 0x80088, 0x80048, 0x900f0, 0x70102, 0x80054, 0x80014,
0x8011c, 0x70112, 0x80074, 0x80034, 0x900c8, 0x7010a, 0x80064,
0x80024, 0x900a8, 0x80004, 0x80084, 0x80044, 0x900e8, 0x70106,
0x8005c, 0x8001c, 0x90098, 0x70116, 0x8007c, 0x8003c, 0x900d8,
0x7010e, 0x8006c, 0x8002c, 0x900b8, 0x8000c, 0x8008c, 0x8004c,
0x900f8, 0x70101, 0x80052, 0x80012, 0x8011a, 0x70111, 0x80072,
0x80032, 0x900c4, 0x70109, 0x80062, 0x80022, 0x900a4, 0x80002,
0x80082, 0x80042, 0x900e4, 0x70105, 0x8005a, 0x8001a, 0x90094,
0x70115, 0x8007a, 0x8003a, 0x900d4, 0x7010d, 0x8006a, 0x8002a,
0x900b4, 0x8000a, 0x8008a, 0x8004a, 0x900f4, 0x70103, 0x80056,
0x80016, 0x8011e, 0x70113, 0x80076, 0x80036, 0x900cc, 0x7010b,
0x80066, 0x80026, 0x900ac, 0x80006, 0x80086, 0x80046, 0x900ec,
0x70107, 0x8005e, 0x8001e, 0x9009c, 0x70117, 0x8007e, 0x8003e,
0x900dc, 0x7010f, 0x8006e, 0x8002e, 0x900bc, 0x8000e, 0x8008e,
0x8004e, 0x900fc, 0x70100, 0x80051, 0x80011, 0x80119, 0x70110,
0x80071, 0x80031, 0x900c2, 0x70108, 0x80061, 0x80021, 0x900a2,
0x80001, 0x80081, 0x80041, 0x900e2, 0x70104, 0x80059, 0x80019,
0x90092, 0x70114, 0x80079, 0x80039, 0x900d2, 0x7010c, 0x80069,
0x80029, 0x900b2, 0x80009, 0x80089, 0x80049, 0x900f2, 0x70102,
0x80055, 0x80015, 0x8011d, 0x70112, 0x80075, 0x80035, 0x900ca,
0x7010a, 0x80065, 0x80025, 0x900aa, 0x80005, 0x80085, 0x80045,
0x900ea, 0x70106, 0x8005d, 0x8001d, 0x9009a, 0x70116, 0x8007d,
0x8003d, 0x900da, 0x7010e, 0x8006d, 0x8002d, 0x900ba, 0x8000d,
0x8008d, 0x8004d, 0x900fa, 0x70101, 0x80053, 0x80013, 0x8011b,
0x70111, 0x80073, 0x80033, 0x900c6, 0x70109, 0x80063, 0x80023,
0x900a6, 0x80003, 0x80083, 0x80043, 0x900e6, 0x70105, 0x8005b,
0x8001b, 0x90096, 0x70115, 0x8007b, 0x8003b, 0x900d6, 0x7010d,
0x8006b, 0x8002b, 0x900b6, 0x8000b, 0x8008b, 0x8004b, 0x900f6,
0x70103, 0x80057, 0x80017, 0x8011f, 0x70113, 0x80077, 0x80037,
0x900ce, 0x7010b, 0x80067, 0x80027, 0x900ae, 0x80007, 0x80087,
0x80047, 0x900ee, 0x70107, 0x8005f, 0x8001f, 0x9009e, 0x70117,
0x8007f, 0x8003f, 0x900de, 0x7010f, 0x8006f, 0x8002f, 0x900be,
0x8000f, 0x8008f, 0x8004f, 0x900fe, 0x70100, 0x80050, 0x80010,
0x80118, 0x70110, 0x80070, 0x80030, 0x900c1, 0x70108, 0x80060,
0x80020, 0x900a1, 0x80000, 0x80080, 0x80040, 0x900e1, 0x70104,
0x80058, 0x80018, 0x90091, 0x70114, 0x80078, 0x80038, 0x900d1,
0x7010c, 0x80068, 0x80028, 0x900b1, 0x80008, 0x80088, 0x80048,
0x900f1, 0x70102, 0x80054, 0x80014, 0x8011c, 0x70112, 0x80074,
0x80034, 0x900c9, 0x7010a, 0x80064, 0x80024, 0x900a9, 0x80004,
0x80084, 0x80044, 0x900e9, 0x70106, 0x8005c, 0x8001c, 0x90099,
0x70116, 0x8007c, 0x8003c, 0x900d9, 0x7010e, 0x8006c, 0x8002c,
0x900b9, 0x8000c, 0x8008c, 0x8004c, 0x900f9, 0x70101, 0x80052,
0x80012, 0x8011a, 0x70111, 0x80072, 0x80032, 0x900c5, 0x70109,
0x80062, 0x80022, 0x900a5, 0x80002, 0x80082, 0x80042, 0x900e5,
0x70105, 0x8005a, 0x8001a, 0x90095, 0x70115, 0x8007a, 0x8003a,
0x900d5, 0x7010d, 0x8006a, 0x8002a, 0x900b5, 0x8000a, 0x8008a,
0x8004a, 0x900f5, 0x70103, 0x80056, 0x80016, 0x8011e, 0x70113,
0x80076, 0x80036, 0x900cd, 0x7010b, 0x80066, 0x80026, 0x900ad,
0x80006, 0x80086, 0x80046, 0x900ed, 0x70107, 0x8005e, 0x8001e,
0x9009d, 0x70117, 0x8007e, 0x8003e, 0x900dd, 0x7010f, 0x8006e,
0x8002e, 0x900bd, 0x8000e, 0x8008e, 0x8004e, 0x900fd, 0x70100,
0x80051, 0x80011, 0x80119, 0x70110, 0x80071, 0x80031, 0x900c3,
0x70108, 0x80061, 0x80021, 0x900a3, 0x80001, 0x80081, 0x80041,
0x900e3, 0x70104, 0x80059, 0x80019, 0x90093, 0x70114, 0x80079,
0x80039, 0x900d3, 0x7010c, 0x80069, 0x80029, 0x900b3, 0x80009,
0x80089, 0x80049, 0x900f3, 0x70102, 0x80055, 0x80015, 0x8011d,
0x70112, 0x80075, 0x80035, 0x900cb, 0x7010a, 0x80065, 0x80025,
0x900ab, 0x80005, 0x80085, 0x80045, 0x900eb, 0x70106, 0x8005d,
0x8001d, 0x9009b, 0x70116, 0x8007d, 0x8003d, 0x900db, 0x7010e,
0x8006d, 0x8002d, 0x900bb, 0x8000d, 0x8008d, 0x8004d, 0x900fb,
0x70101, 0x80053, 0x80013, 0x8011b, 0x70111, 0x80073, 0x80033,
0x900c7, 0x70109, 0x80063, 0x80023, 0x900a7, 0x80003, 0x80083,
0x80043, 0x900e7, 0x70105, 0x8005b, 0x8001b, 0x90097, 0x70115,
0x8007b, 0x8003b, 0x900d7, 0x7010d, 0x8006b, 0x8002b, 0x900b7,
0x8000b, 0x8008b, 0x8004b, 0x900f7, 0x70103, 0x80057, 0x80017,
0x8011f, 0x70113, 0x80077, 0x80037, 0x900cf, 0x7010b, 0x80067,
0x80027, 0x900af, 0x80007, 0x80087, 0x80047, 0x900ef, 0x70107,
0x8005f, 0x8001f, 0x9009f, 0x70117, 0x8007f, 0x8003f, 0x900df,
0x7010f, 0x8006f, 0x8002f, 0x900bf, 0x8000f, 0x8008f, 0x8004f,
0x900ff
]), 9];
const fixedDistCodeTab = [Uint32Array([
0x50000, 0x50010, 0x50008, 0x50018, 0x50004, 0x50014, 0x5000c,
0x5001c, 0x50002, 0x50012, 0x5000a, 0x5001a, 0x50006, 0x50016,
0x5000e, 0x00000, 0x50001, 0x50011, 0x50009, 0x50019, 0x50005,
0x50015, 0x5000d, 0x5001d, 0x50003, 0x50013, 0x5000b, 0x5001b,
0x50007, 0x50017, 0x5000f, 0x00000
]), 5];
function constructor(stream) {
var bytes = stream.getBytes();
var bytesPos = 0;
this.dict = stream.dict;
var cmf = bytes[bytesPos++];
var flg = bytes[bytesPos++];
if (cmf == -1 || flg == -1)
error("Invalid header in flate stream");
if ((cmf & 0x0f) != 0x08)
error("Unknown compression method in flate stream");
if ((((cmf << 8) + flg) % 31) != 0)
error("Bad FCHECK in flate stream");
if (flg & 0x20)
error("FDICT bit set in flate stream");
this.bytes = bytes;
this.bytesPos = bytesPos;
this.eof = false;
this.codeSize = 0;
this.codeBuf = 0;
this.pos = 0;
this.bufferLength = 0;
}
constructor.prototype = {
getBits: function(bits) {
var codeSize = this.codeSize;
var codeBuf = this.codeBuf;
var bytes = this.bytes;
var bytesPos = this.bytesPos;
var b;
while (codeSize < bits) {
if (typeof (b = bytes[bytesPos++]) == "undefined")
error("Bad encoding in flate stream");
codeBuf |= b << codeSize;
codeSize += 8;
}
b = codeBuf & ((1 << bits) - 1);
this.codeBuf = codeBuf >> bits;
this.codeSize = codeSize -= bits;
this.bytesPos = bytesPos;
return b;
},
getCode: function(table) {
var codes = table[0];
var maxLen = table[1];
var codeSize = this.codeSize;
var codeBuf = this.codeBuf;
var bytes = this.bytes;
var bytesPos = this.bytesPos;
while (codeSize < maxLen) {
var b;
if (typeof (b = bytes[bytesPos++]) == "undefined")
error("Bad encoding in flate stream");
codeBuf |= (b << codeSize);
codeSize += 8;
}
var code = codes[codeBuf & ((1 << maxLen) - 1)];
var codeLen = code >> 16;
var codeVal = code & 0xffff;
if (codeSize == 0|| codeSize < codeLen || codeLen == 0)
error("Bad encoding in flate stream");
this.codeBuf = (codeBuf >> codeLen);
this.codeSize = (codeSize - codeLen);
this.bytesPos = bytesPos;
return codeVal;
},
ensureBuffer: function(requested) {
var buffer = this.buffer;
var current = buffer ? buffer.byteLength : 0;
if (requested < current)
return buffer;
var size = 512;
while (size < requested)
size <<= 1;
var buffer2 = Uint8Array(size);
for (var i = 0; i < current; ++i)
buffer2[i] = buffer[i];
return this.buffer = buffer2;
},
getByte: function() {
var pos = this.pos;
while (this.bufferLength <= pos) {
if (this.eof)
return;
this.readBlock();
}
return this.buffer[this.pos++];
},
getBytes: function(length) {
var pos = this.pos;
while (!this.eof && this.bufferLength < pos + length)
this.readBlock();
var end = pos + length;
var bufEnd = this.bufferLength;
if (end > bufEnd)
end = bufEnd;
this.pos = end;
return this.buffer.subarray(pos, end)
},
lookChar: function() {
var pos = this.pos;
while (this.bufferLength <= pos) {
if (this.eof)
return;
this.readBlock();
}
return String.fromCharCode(this.buffer[pos]);
},
getChar: function() {
var ch = this.lookChar();
// shouldnt matter what the position is if we get past the eof
// so no need to check if ch is undefined
this.pos++;
return ch;
},
skip: function(n) {
if (!n)
n = 1;
this.pos += n;
},
generateHuffmanTable: function(lengths) {
var n = lengths.length;
// find max code length
var maxLen = 0;
for (var i = 0; i < n; ++i) {
if (lengths[i] > maxLen)
maxLen = lengths[i];
}
// build the table
var size = 1 << maxLen;
var codes = Uint32Array(size);
for (var len = 1, code = 0, skip = 2;
len <= maxLen;
++len, code <<= 1, skip <<= 1) {
for (var val = 0; val < n; ++val) {
if (lengths[val] == len) {
// bit-reverse the code
var code2 = 0;
var t = code;
for (var i = 0; i < len; ++i) {
code2 = (code2 << 1) | (t & 1);
t >>= 1;
}
// fill the table entries
for (var i = code2; i < size; i += skip)
codes[i] = (len << 16) | val;
++code;
}
}
}
return [codes, maxLen];
},
readBlock: function() {
function repeat(stream, array, len, offset, what) {
var repeat = stream.getBits(len) + offset;
while (repeat-- > 0)
array[i++] = what;
}
var bytes = this.bytes;
var bytesPos = this.bytesPos;
// read block header
var hdr = this.getBits(3);
if (hdr & 1)
this.eof = true;
hdr >>= 1;
var b;
if (hdr == 0) { // uncompressed block
if (typeof (b = bytes[bytesPos++]) == "undefined")
error("Bad block header in flate stream");
var blockLen = b;
if (typeof (b = bytes[bytesPos++]) == "undefined")
error("Bad block header in flate stream");
blockLen |= (b << 8);
if (typeof (b = bytes[bytesPos++]) == "undefined")
error("Bad block header in flate stream");
var check = b;
if (typeof (b = bytes[bytesPos++]) == "undefined")
error("Bad block header in flate stream");
check |= (b << 8);
if (check != (~this.blockLen & 0xffff))
error("Bad uncompressed block length in flate stream");
var bufferLength = this.bufferLength;
var buffer = this.ensureBuffer(bufferLength + blockLen);
this.bufferLength = bufferLength + blockLen;
for (var n = bufferLength; n < blockLen; ++n) {
if (typeof (b = bytes[bytesPos++]) == "undefined") {
this.eof = true;
break;
}
buffer[n] = b;
}
return;
}
var litCodeTable;
var distCodeTable;
if (hdr == 1) { // compressed block, fixed codes
litCodeTable = fixedLitCodeTab;
distCodeTable = fixedDistCodeTab;
} else if (hdr == 2) { // compressed block, dynamic codes
var numLitCodes = this.getBits(5) + 257;
var numDistCodes = this.getBits(5) + 1;
var numCodeLenCodes = this.getBits(4) + 4;
// build the code lengths code table
var codeLenCodeLengths = Array(codeLenCodeMap.length);
var i = 0;
while (i < numCodeLenCodes)
codeLenCodeLengths[codeLenCodeMap[i++]] = this.getBits(3);
var codeLenCodeTab = this.generateHuffmanTable(codeLenCodeLengths);
// build the literal and distance code tables
var len = 0;
var i = 0;
var codes = numLitCodes + numDistCodes;
var codeLengths = new Array(codes);
while (i < codes) {
var code = this.getCode(codeLenCodeTab);
if (code == 16) {
repeat(this, codeLengths, 2, 3, len);
} else if (code == 17) {
repeat(this, codeLengths, 3, 3, len = 0);
} else if (code == 18) {
repeat(this, codeLengths, 7, 11, len = 0);
} else {
codeLengths[i++] = len = code;
}
}
litCodeTable = this.generateHuffmanTable(codeLengths.slice(0, numLitCodes));
distCodeTable = this.generateHuffmanTable(codeLengths.slice(numLitCodes, codes));
} else {
error("Unknown block type in flate stream");
}
var pos = this.bufferLength;
while (true) {
var code1 = this.getCode(litCodeTable);
if (code1 == 256) {
this.bufferLength = pos;
return;
}
if (code1 < 256) {
var buffer = this.ensureBuffer(pos + 1);
buffer[pos++] = code1;
} else {
code1 -= 257;
code1 = lengthDecode[code1];
var code2 = code1 >> 16;
if (code2 > 0)
code2 = this.getBits(code2);
var len = (code1 & 0xffff) + code2;
code1 = this.getCode(distCodeTable);
code1 = distDecode[code1];
code2 = code1 >> 16;
if (code2 > 0)
code2 = this.getBits(code2);
var dist = (code1 & 0xffff) + code2;
var buffer = this.ensureBuffer(pos + len);
for (var k = 0; k < len; ++k, ++pos)
buffer[pos] = buffer[pos - dist];
}
}
}
};
return constructor;
})();
// A JpegStream can't be read directly. We use the platform to render the underlying
// JPEG data for us.
var JpegStream = (function() {
function constructor(bytes, dict) {
// TODO: per poppler, some images may have "junk" before that need to be removed
this.dict = dict;
// create DOM image
var img = new Image();
img.src = "data:image/jpeg;base64," + window.btoa(bytesToString(bytes));
this.domImage = img;
}
constructor.prototype = {
getImage: function() {
return this.domImage;
},
getChar: function() {
error("internal error: getChar is not valid on JpegStream");
}
};
return constructor;
})();
var PredictorStream = (function() {
function constructor(stream, params) {
var predictor = this.predictor = params.get("Predictor") || 1;
if (predictor <= 1)
return stream; // no prediction
if (predictor !== 2 && (predictor < 10 || predictor > 15))
error("Unsupported predictor");
if (predictor === 2)
this.readRow = this.readRowTiff;
else
this.readRow = this.readRowPng;
this.stream = stream;
this.dict = stream.dict;
if (params.has("EarlyChange")) {
error("EarlyChange predictor parameter is not supported");
}
var colors = this.colors = params.get("Colors") || 1;
var bits = this.bits = params.get("BitsPerComponent") || 8;
var columns = this.columns = params.get("Columns") || 1;
var pixBytes = this.pixBytes = (colors * bits + 7) >> 3;
// add an extra pixByte to represent the pixel left of column 0
var rowBytes = this.rowBytes = ((columns * colors * bits + 7) >> 3) + pixBytes;
this.currentRow = new Uint8Array(rowBytes);
this.bufferLength = rowBytes;
this.pos = rowBytes;
}
constructor.prototype = {
readRowTiff : function() {
var currentRow = this.currentRow;
var rowBytes = this.rowBytes;
var pixBytes = this.pixBytes;
var bits = this.bits;
var colors = this.colors;
var rawBytes = this.stream.getBytes(rowBytes - pixBytes);
if (bits === 1) {
var inbuf = 0;
for (var i = pixBytes, j = 0; i < rowBytes; ++i, ++j) {
var c = rawBytes[j];
inBuf = (inBuf << 8) | c;
// bitwise addition is exclusive or
// first shift inBuf and then add
currentRow[i] = (c ^ (inBuf >> colors)) & 0xFF;
// truncate inBuf (assumes colors < 16)
inBuf &= 0xFFFF;
}
} else if (bits === 8) {
for (var i = pixBytes, j = 0; i < rowBytes; ++i, ++j)
currentRow[i] = currentRow[i - colors] + rawBytes[j];
} else {
var compArray = new Uint8Array(colors + 1);
var bitMask = (1 << bits) - 1;
var inbuf = 0, outbut = 0;
var inbits = 0, outbits = 0;
var j = 0, k = pixBytes;
var columns = this.columns;
for (var i = 0; i < columns; ++i) {
for (var kk = 0; kk < colors; ++kk) {
if (inbits < bits) {
inbuf = (inbuf << 8) | (rawBytes[j++] & 0xFF);
inbits += 8;
}
compArray[kk] = (compArray[kk] +
(inbuf >> (inbits - bits))) & bitMask;
inbits -= bits;
outbuf = (outbuf << bits) | compArray[kk];
outbits += bits;
if (outbits >= 8) {
currentRow[k++] = (outbuf >> (outbits - 8)) & 0xFF;
outbits -= 8;
}
}
}
if (outbits > 0) {
currentRow[k++] = (outbuf << (8 - outbits)) +
(inbuf & ((1 << (8 - outbits)) - 1))
}
}
this.pos = pixBytes;
},
readRowPng : function() {
var currentRow = this.currentRow;
var rowBytes = this.rowBytes;
var pixBytes = this.pixBytes;
var predictor = this.stream.getByte();
var rawBytes = this.stream.getBytes(rowBytes - pixBytes);
switch (predictor) {
case 0:
break;
case 1:
for (var i = pixBytes, j = 0; i < rowBytes; ++i, ++j)
currentRow[i] = (currentRow[i - pixBytes] + rawBytes[j]) & 0xFF;
break;
case 2:
for (var i = pixBytes, j = 0; i < rowBytes; ++i, ++j)
currentRow[i] = (currentRow[i] + rawBytes[j]) & 0xFF;
break;
case 3:
for (var i = pixBytes, j = 0; i < rowBytes; ++i, ++j)
currentRow[i] = (((currentRow[i] + currentRow[i - pixBytes])
>> 1) + rawBytes[j]) & 0xFF;
break;
case 4:
// we need to save the up left pixels values. the simplest way
// is to create a new buffer
var lastRow = currentRow;
var currentRow = new Uint8Array(rowBytes);
for (var i = pixBytes, j = 0; i < rowBytes; ++i, ++j) {
var up = lastRow[i];
var upLeft = lastRow[i - pixBytes];
var left = currentRow[i - pixBytes];
var p = left + up - upLeft;
var pa = p - left;
if (pa < 0)
pa = -pa;
var pb = p - up;
if (pb < 0)
pb = -pb;
var pc = p - upLeft;
if (pc < 0)
pc = -pc;
var c = rawBytes[j];
if (pa <= pb && pa <= pc)
currentRow[i] = left + c;
else if (pb <= pc)
currentRow[i] = up + c;
else
currentRow[i] = upLeft + c;
break;
this.currentRow = currentRow;
}
default:
error("Unsupported predictor");
break;
}
this.pos = pixBytes;
},
getByte : function() {
if (this.pos >= this.bufferLength)
this.readRow();
return this.currentRow[this.pos++];
},
getBytes : function(n) {
var i, bytes;
bytes = new Uint8Array(n);
for (i = 0; i < n; ++i) {
if (this.pos >= this.bufferLength)
this.readRow();
bytes[i] = this.currentRow[this.pos++];
}
return bytes;
},
getChar : function() {
return String.formCharCode(this.getByte());
},
lookChar : function() {
if (this.pos >= this.bufferLength)
this.readRow();
return String.formCharCode(this.currentRow[this.pos]);
},
skip : function(n) {
var i;
if (!n) {
n = 1;
}
while (n > this.bufferLength - this.pos) {
n -= this.bufferLength - this.pos;
this.readRow();
if (this.bufferLength === 0) break;
}
this.pos += n;
}
};
return constructor;
})();
var DecryptStream = (function() {
function constructor(str, fileKey, encAlgorithm, keyLength) {
TODO("decrypt stream is not implemented");
}
constructor.prototype = Stream.prototype;
return constructor;
})();
var Name = (function() {
function constructor(name) {
this.name = name;
}
constructor.prototype = {
};
return constructor;
})();
var Cmd = (function() {
function constructor(cmd) {
this.cmd = cmd;
}
constructor.prototype = {
};
return constructor;
})();
var Dict = (function() {
function constructor() {
this.map = Object.create(null);
}
constructor.prototype = {
get: function(key) {
return this.map[key];
},
get2: function(key1, key2) {
return this.get(key1) || this.get(key2);
},
getOrInherit: function(key, xref) {
var obj = this.map[key];
var dict = this;
while (!obj && dict) {
dict = xref.fetchIfRef(dict.get("Parent"));
if (dict)
obj = dict.get(key);
}
return obj;
},
has: function(key) {
return key in this.map;
},
set: function(key, value) {
this.map[key] = value;
},
forEach: function(aCallback) {
for (var key in this.map)
aCallback(key, this.map[key]);
}
};
return constructor;
})();
var Ref = (function() {
function constructor(num, gen) {
this.num = num;
this.gen = gen;
}
constructor.prototype = {
};
return constructor;
})();
function IsBool(v) {
return typeof v == "boolean";
}
function IsInt(v) {
return typeof v == "number" && ((v|0) == v);
}
function IsNum(v) {
return typeof v == "number";
}
function IsString(v) {
return typeof v == "string";
}
function IsNull(v) {
return v === null;
}
function IsName(v) {
return v instanceof Name;
}
function IsCmd(v, cmd) {
return v instanceof Cmd && (!cmd || v.cmd == cmd);
}
function IsDict(v, type) {
return v instanceof Dict && (!type || v.get("Type").name == type);
}
function IsArray(v) {
return v instanceof Array;
}
function IsStream(v) {
return typeof v == "object" && "getChar" in v;
}
function IsRef(v) {
return v instanceof Ref;
}
function IsPDFFunction(v) {
var fnDict;
if (typeof v != "object")
return false;
else if (IsDict(v))
fnDict = v;
else if (IsStream(v))
fnDict = v.dict;
else
return false;
return fnDict.has("FunctionType");
}
var EOF = {};
function IsEOF(v) {
return v == EOF;
}
var None = {};
function IsNone(v) {
return v == None;
}
var Lexer = (function() {
function constructor(stream) {
this.stream = stream;
}
constructor.isSpace = function(ch) {
return ch == " " || ch == "\t";
}
// A '1' in this array means the character is white space. A '1' or
// '2' means the character ends a name or command.
var specialChars = [
1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, // 0x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 1x
1, 0, 0, 0, 0, 2, 0, 0, 2, 2, 0, 0, 0, 0, 0, 2, // 2x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 2, 0, // 3x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 4x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, // 5x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 6x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, // 7x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 8x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 9x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // ax
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // bx
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // cx
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // dx
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // ex
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 // fx
];
const MIN_INT = (1<<31) | 0;
const MAX_INT = (MIN_INT - 1) | 0;
const MIN_UINT = 0;
const MAX_UINT = ((1<<30) * 4) - 1;
function ToHexDigit(ch) {
if (ch >= "0" && ch <= "9")
return ch - "0";
ch = ch.toLowerCase();
if (ch >= "a" && ch <= "f")
return ch - "a";
return -1;
}
constructor.prototype = {
getNumber: function(ch) {
var floating = false;
var str = ch;
var stream = this.stream;
do {
ch = stream.lookChar();
if (ch == "." && !floating) {
str += ch;
floating = true;
} else if (ch == "-") {
// ignore minus signs in the middle of numbers to match
// Adobe's behavior
warn("Badly formated number");
} else if (ch >= "0" && ch <= "9") {
str += ch;
} else if (ch == "e" || ch == "E") {
floating = true;
} else {
// the last character doesn't belong to us
break;
}
stream.skip();
} while (true);
var value = parseFloat(str);
if (isNaN(value))
error("Invalid floating point number");
return value;
},
getString: function() {
var n = 0;
var numParen = 1;
var done = false;
var str = "";
var stream = this.stream;
var ch;
do {
switch (ch = stream.getChar()) {
case undefined:
warn("Unterminated string");
done = true;
break;
case '(':
++numParen;
str += ch;
break;
case ')':
if (--numParen == 0) {
done = true;
} else {
str += ch;
}
break;
case '\\':
switch (ch = stream.getChar()) {
case undefined:
warn("Unterminated string");
done = true;
break;
case 'n':
str += '\n';
break;
case 'r':
str += '\r';
break;
case 't':
str += '\t';
break;
case 'b':
str += '\b';
break;
case 'f':
str += '\f';
break;
case '\\':
case '(':
case ')':
str += ch;
break;
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
var x = ch - '0';
ch = stream.lookChar();
if (ch >= '0' && ch <= '7') {
stream.skip();
x = (x << 3) + (ch - '0');
ch = stream.lookChar();
if (ch >= '0' && ch <= '7') {
stream.skip();
x = (x << 3) + (ch - '0');
}
}
str += String.fromCharCode(x);
break;
case '\r':
ch = stream.lookChar();
if (ch == '\n')
stream.skip();
break;
case '\n':
break;
default:
str += ch;
break;
}
break;
default:
str += ch;
break;
}
} while (!done);
if (!str.length)
return EOF;
return str;
},
getName: function(ch) {
var str = "";
var stream = this.stream;
while (!!(ch = stream.lookChar()) && !specialChars[ch.charCodeAt(0)]) {
stream.skip();
if (ch == "#") {
ch = stream.lookChar();
var x = ToHexDigit(ch);
if (x != -1) {
stream.skip();
var x2 = ToHexDigit(stream.getChar());
if (x2 == -1)
error("Illegal digit in hex char in name");
str += String.fromCharCode((x << 4) | x2);
} else {
str += "#";
str += ch;
}
} else {
str += ch;
}
}
if (str.length > 128)
error("Warning: name token is longer than allowed by the specification");
return new Name(str);
},
getHexString: function(ch) {
var str = "";
var stream = this.stream;
while (1) {
ch = stream.getChar();
if (ch == '>') {
break;
}
if (!ch) {
warn("Unterminated hex string");
break;
}
if (specialChars[ch.charCodeAt(0)] != 1) {
var x, x2;
if (((x = ToHexDigit(ch)) == -1) ||
((x2 = ToHexDigit(stream.getChar())) == -1)) {
error("Illegal character in hex string");
break;
}
str += String.fromCharCode((x << 4) | x2);
}
}
return str;
},
getObj: function() {
// skip whitespace and comments
var comment = false;
var stream = this.stream;
var ch;
while (true) {
if (!(ch = stream.getChar()))
return EOF;
if (comment) {
if (ch == '\r' || ch == '\n')
comment = false;
} else if (ch == '%') {
comment = true;
} else if (specialChars[ch.charCodeAt(0)] != 1) {
break;
}
}
// start reading token
switch (ch) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case '+': case '-': case '.':
return this.getNumber(ch);
case '(':
return this.getString();
case '/':
return this.getName(ch);
// array punctuation
case '[':
case ']':
return new Cmd(ch);
// hex string or dict punctuation
case '<':
ch = stream.lookChar();
if (ch == '<') {
// dict punctuation
stream.skip();
return new Cmd("<<");
}
return this.getHexString(ch);
// dict punctuation
case '>':
ch = stream.lookChar();
if (ch == '>') {
stream.skip();
return new Cmd(">>");
}
case "{":
case "}":
return new Cmd(ch);
// fall through
case ')':
error("Illegal character");
return Error;
}
// command
var str = ch;
while (!!(ch = stream.lookChar()) && !specialChars[ch.charCodeAt(0)]) {
stream.skip();
if (str.length == 128) {
error("Command token too long");
break;
}
str += ch;
}
if (str == "true")
return true;
if (str == "false")
return false;
if (str == "null")
return null;
return new Cmd(str);
},
skipToNextLine: function() {
var stream = this.stream;
while (true) {
var ch = stream.getChar();
if (!ch || ch == "\n")
return;
if (ch == "\r") {
if ((ch = stream.lookChar()) == "\n")
stream.skip();
return;
}
}
}
};
return constructor;
})();
var Parser = (function() {
function constructor(lexer, allowStreams, xref) {
this.lexer = lexer;
this.allowStreams = allowStreams;
this.xref = xref;
this.inlineImg = 0;
this.refill();
}
constructor.prototype = {
refill: function() {
this.buf1 = this.lexer.getObj();
this.buf2 = this.lexer.getObj();
},
shift: function() {
if (this.inlineImg > 0) {
if (this.inlineImg < 2) {
this.inlineImg++;
} else {
// in a damaged content stream, if 'ID' shows up in the middle
// of a dictionary, we need to reset
this.inlineImg = 0;
}
} else if (IsCmd(this.buf2, "ID")) {
this.lexer.skip(); // skip char after 'ID' command
this.inlineImg = 1;
}
this.buf1 = this.buf2;
// don't buffer inline image data
this.buf2 = (this.inlineImg > 0) ? null : this.lexer.getObj();
},
getObj: function() {
// refill buffer after inline image data
if (this.inlineImg == 2)
this.refill();
if (IsCmd(this.buf1, "[")) { // array
this.shift();
var array = [];
while (!IsCmd(this.buf1, "]") && !IsEOF(this.buf1))
array.push(this.getObj());
if (IsEOF(this.buf1))
error("End of file inside array");
this.shift();
return array;
} else if (IsCmd(this.buf1, "<<")) { // dictionary or stream
this.shift();
var dict = new Dict();
while (!IsCmd(this.buf1, ">>") && !IsEOF(this.buf1)) {
if (!IsName(this.buf1)) {
error("Dictionary key must be a name object");
shift();
} else {
var key = this.buf1.name;
this.shift();
if (IsEOF(this.buf1))
break;
dict.set(key, this.getObj());
}
}
if (IsEOF(this.buf1))
error("End of file inside dictionary");
// stream objects are not allowed inside content streams or
// object streams
if (this.allowStreams && IsCmd(this.buf2, "stream")) {
return this.makeStream(dict);
} else {
this.shift();
}
return dict;
} else if (IsInt(this.buf1)) { // indirect reference or integer
var num = this.buf1;
this.shift();
if (IsInt(this.buf1) && IsCmd(this.buf2, "R")) {
var ref = new Ref(num, this.buf1);
this.shift();
this.shift();
return ref;
}
return num;
} else if (IsString(this.buf1)) { // string
var str = this.buf1;
this.shift();
if (this.fileKey) {
var decrypt = new DecryptStream(new StringStream(str),
this.fileKey,
this.encAlgorithm,
this.keyLength);
var str = "";
var pos = decrypt.pos;
var length = decrypt.length;
while (pos++ > length)
str += decrypt.getChar();
}
return str;
}
// simple object
var obj = this.buf1;
this.shift();
return obj;
},
makeStream: function(dict) {
var lexer = this.lexer;
var stream = lexer.stream;
// get stream start position
lexer.skipToNextLine();
var pos = stream.pos;
// get length
var length = dict.get("Length");
var xref = this.xref;
if (xref)
length = xref.fetchIfRef(length);
if (!IsInt(length)) {
error("Bad 'Length' attribute in stream");
length = 0;
}
// skip over the stream data
stream.pos = pos + length;
this.shift(); // '>>'
this.shift(); // 'stream'
if (!IsCmd(this.buf1, "endstream"))
error("Missing 'endstream'");
this.shift();
stream = stream.makeSubStream(pos, length, dict);
if (this.fileKey) {
stream = new DecryptStream(stream,
this.fileKey,
this.encAlgorithm,
this.keyLength);
}
stream = this.filter(stream, dict, length);
stream.parameters = dict;
return stream;
},
filter: function(stream, dict, length) {
var filter = dict.get2("Filter", "F");
var params = dict.get2("DecodeParms", "DP");
if (IsName(filter))
return this.makeFilter(stream, filter.name, length, params);
if (IsArray(filter)) {
var filterArray = filter;
var paramsArray = params;
for (var i = 0, ii = filter.length; i < ii; ++i) {
filter = filter[i];
if (!IsName(filter))
error("Bad filter name");
else {
params = null;
if (IsArray(paramsArray) && (i in paramsArray))
params = paramsArray[i];
stream = this.makeFilter(stream, filter.name, length, params);
}
}
}
return stream;
},
makeFilter: function(stream, name, length, params) {
if (name == "FlateDecode" || name == "Fl") {
if (params) {
return new PredictorStream(new FlateStream(stream), params);
}
return new FlateStream(stream);
} else if (name == "DCTDecode") {
var bytes = stream.getBytes(length);
return new JpegStream(bytes, stream.dict);
} else {
error("filter '" + name + "' not supported yet");
}
return stream;
}
};
return constructor;
})();
var Linearization = (function() {
function constructor(stream) {
this.parser = new Parser(new Lexer(stream), false);
var obj1 = this.parser.getObj();
var obj2 = this.parser.getObj();
var obj3 = this.parser.getObj();
this.linDict = this.parser.getObj();
if (IsInt(obj1) && IsInt(obj2) && IsCmd(obj3, "obj") && IsDict(this.linDict)) {
var obj = this.linDict.get("Linearized");
if (!(IsNum(obj) && obj > 0))
this.linDict = null;
}
}
constructor.prototype = {
getInt: function(name) {
var linDict = this.linDict;
var obj;
if (IsDict(linDict) &&
IsInt(obj = linDict.get(name)) &&
obj > 0) {
return obj;
}
error("'" + name + "' field in linearization table is invalid");
return 0;
},
getHint: function(index) {
var linDict = this.linDict;
var obj1, obj2;
if (IsDict(linDict) &&
IsArray(obj1 = linDict.get("H")) &&
obj1.length >= 2 &&
IsInt(obj2 = obj1[index]) &&
obj2 > 0) {
return obj2;
}
error("Hints table in linearization table is invalid");
return 0;
},
get length() {
if (!IsDict(this.linDict))
return 0;
return this.getInt("L");
},
get hintsOffset() {
return this.getHint(0);
},
get hintsLength() {
return this.getHint(1);
},
get hintsOffset2() {
return this.getHint(2);
},
get hintsLenth2() {
return this.getHint(3);
},
get objectNumberFirst() {
return this.getInt("O");
},
get endFirst() {
return this.getInt("E");
},
get numPages() {
return this.getInt("N");
},
get mainXRefEntriesOffset() {
return this.getInt("T");
},
get pageFirst() {
return this.getInt("P");
}
};
return constructor;
})();
var XRef = (function() {
function constructor(stream, startXRef, mainXRefEntriesOffset) {
this.stream = stream;
this.entries = [];
this.xrefstms = {};
var trailerDict = this.readXRef(startXRef);
// get the root dictionary (catalog) object
if (!IsRef(this.root = trailerDict.get("Root")))
error("Invalid root reference");
// prepare the XRef cache
this.cache = [];
}
constructor.prototype = {
readXRefTable: function(parser) {
var obj;
while (true) {
if (IsCmd(obj = parser.getObj(), "trailer"))
break;
if (!IsInt(obj))
error("Invalid XRef table");
var first = obj;
if (!IsInt(obj = parser.getObj()))
error("Invalid XRef table");
var n = obj;
if (first < 0 || n < 0 || (first + n) != ((first + n) | 0))
error("Invalid XRef table");
for (var i = first; i < first + n; ++i) {
var entry = {};
if (!IsInt(obj = parser.getObj()))
error("Invalid XRef table");
entry.offset = obj;
if (!IsInt(obj = parser.getObj()))
error("Invalid XRef table");
entry.gen = obj;
obj = parser.getObj();
if (IsCmd(obj, "n")) {
entry.uncompressed = true;
} else if (IsCmd(obj, "f")) {
entry.free = true;
} else {
error("Invalid XRef table");
}
if (!this.entries[i]) {
// In some buggy PDF files the xref table claims to start at 1
// instead of 0.
if (i == 1 && first == 1 &&
entry.offset == 0 && entry.gen == 65535 && entry.free) {
i = first = 0;
}
this.entries[i] = entry;
}
}
}
// read the trailer dictionary
var dict;
if (!IsDict(dict = parser.getObj()))
error("Invalid XRef table");
// get the 'Prev' pointer
var prev;
obj = dict.get("Prev");
if (IsInt(obj)) {
prev = obj;
} else if (IsRef(obj)) {
// certain buggy PDF generators generate "/Prev NNN 0 R" instead
// of "/Prev NNN"
prev = obj.num;
}
if (prev) {
this.readXRef(prev);
}
// check for 'XRefStm' key
if (IsInt(obj = dict.get("XRefStm"))) {
var pos = obj;
if (pos in this.xrefstms)
error("Invalid XRef table");
this.xrefstms[pos] = 1; // avoid infinite recursion
this.readXRef(pos);
}
return dict;
},
readXRefStream: function(stream) {
var streamParameters = stream.parameters;
var length = streamParameters.get("Length");
var byteWidths = streamParameters.get("W");
var range = streamParameters.get("Index");
if (!range)
range = [0, streamParameters.get("Size")];
var i, j;
while (range.length > 0) {
var first = range[0], n = range[1];
if (!IsInt(first) || !IsInt(n))
error("Invalid XRef range fields");
var typeFieldWidth = byteWidths[0], offsetFieldWidth = byteWidths[1], generationFieldWidth = byteWidths[2];
if (!IsInt(typeFieldWidth) || !IsInt(offsetFieldWidth) || !IsInt(generationFieldWidth))
error("Invalid XRef entry fields length");
for (i = 0; i < n; ++i) {
var type = 0, offset = 0, generation = 0;
for (j = 0; j < typeFieldWidth; ++j)
type = (type << 8) | stream.getByte();
// if type field is absent, its default value = 1
if (typeFieldWidth == 0)
type = 1;
for (j = 0; j < offsetFieldWidth; ++j)
offset = (offset << 8) | stream.getByte();
for (j = 0; j < generationFieldWidth; ++j)
generation = (generation << 8) | stream.getByte();
var entry = {}
entry.offset = offset;
entry.gen = generation;
switch (type) {
case 0:
entry.free = true;
break;
case 1:
entry.uncompressed = true;
break;
case 2:
break;
default:
error("Invalid XRef entry type");
break;
}
if (!this.entries[first + i])
this.entries[first + i] = entry;
}
range.splice(0, 2);
}
var prev = streamParameters.get("Prev");
if (IsInt(prev))
this.readXRef(prev);
return streamParameters;
},
readXRef: function(startXRef) {
var stream = this.stream;
stream.pos = startXRef;
var parser = new Parser(new Lexer(stream), true);
var obj = parser.getObj();
// parse an old-style xref table
if (IsCmd(obj, "xref"))
return this.readXRefTable(parser);
// parse an xref stream
if (IsInt(obj)) {
if (!IsInt(parser.getObj()) ||
!IsCmd(parser.getObj(), "obj") ||
!IsStream(obj = parser.getObj())) {
error("Invalid XRef stream");
}
return this.readXRefStream(obj);
}
error("Invalid XRef");
},
getEntry: function(i) {
var e = this.entries[i];
if (e.free)
error("reading an XRef stream not implemented yet");
return e;
},
fetchIfRef: function(obj) {
if (!IsRef(obj))
return obj;
return this.fetch(obj);
},
fetch: function(ref) {
var num = ref.num;
var e = this.cache[num];
if (e)
return e;
e = this.getEntry(num);
var gen = ref.gen;
var stream, parser;
if (e.uncompressed) {
if (e.gen != gen)
throw("inconsistent generation in XRef");
stream = this.stream.makeSubStream(e.offset);
parser = new Parser(new Lexer(stream), true, this);
var obj1 = parser.getObj();
var obj2 = parser.getObj();
var obj3 = parser.getObj();
if (!IsInt(obj1) || obj1 != num ||
!IsInt(obj2) || obj2 != gen ||
!IsCmd(obj3)) {
error("bad XRef entry");
}
if (!IsCmd(obj3, "obj")) {
// some bad pdfs use "obj1234" and really mean 1234
if (obj3.cmd.indexOf("obj") == 0) {
var num = parseInt(obj3.cmd.substring(3));
if (!isNaN(num))
return num;
}
error("bad XRef entry");
}
e = parser.getObj();
// Don't cache streams since they are mutable.
if (!IsStream(e))
this.cache[num] = e;
return e;
}
// compressed entry
stream = this.fetch(new Ref(e.offset, 0));
if (!IsStream(stream))
error("bad ObjStm stream");
var first = stream.parameters.get("First");
var n = stream.parameters.get("N");
if (!IsInt(first) || !IsInt(n)) {
error("invalid first and n parameters for ObjStm stream");
}
parser = new Parser(new Lexer(stream), false);
var i, entries = [], nums = [];
// read the object numbers to populate cache
for (i = 0; i < n; ++i) {
var num = parser.getObj();
if (!IsInt(num)) {
error("invalid object number in the ObjStm stream");
}
nums.push(num);
var offset = parser.getObj();
if (!IsInt(offset)) {
error("invalid object offset in the ObjStm stream");
}
}
// read stream objects for cache
for (i = 0; i < n; ++i) {
entries.push(parser.getObj());
this.cache[nums[i]] = entries[i];
}
e = entries[e.gen];
if (!e) {
error("bad XRef entry for compressed object");
}
return e;
},
getCatalogObj: function() {
return this.fetch(this.root);
}
};
return constructor;
})();
var Page = (function() {
function constructor(xref, pageNumber, pageDict) {
this.xref = xref;
this.pageNumber = pageNumber;
this.pageDict = pageDict;
}
constructor.prototype = {
get content() {
return shadow(this, "content", this.pageDict.get("Contents"));
},
get resources() {
return shadow(this, "resources",
this.pageDict.getOrInherit("Resources", this.xref));
},
get mediaBox() {
var obj = this.pageDict.getOrInherit("MediaBox", this.xref);
return shadow(this, "mediaBox", ((IsArray(obj) && obj.length == 4)
? obj
: null));
},
compile: function(gfx, fonts) {
if (this.code) {
// content was compiled
return;
}
var xref = this.xref;
var content;
var resources = xref.fetchIfRef(this.resources);
if (!IsArray(this.content)) {
// content is not an array, shortcut
content = xref.fetchIfRef(this.content);
this.code = gfx.compile(content, xref, resources, fonts);
return;
}
// the content is an array, compiling all items
var i, n = this.content.length, compiledItems = [];
for (i = 0; i < n; ++i) {
content = xref.fetchIfRef(this.content[i]);
compiledItems.push(gfx.compile(content, xref, resources, fonts));
}
// creating the function that executes all compiled items
this.code = function(gfx) {
var i, n = compiledItems.length;
for (i = 0; i < n; ++i) {
compiledItems[i](gfx);
}
};
},
display: function(gfx) {
assert(this.code instanceof Function, "page content must be compiled first");
var xref = this.xref;
var resources = xref.fetchIfRef(this.resources);
var mediaBox = xref.fetchIfRef(this.mediaBox);
assertWellFormed(IsDict(resources), "invalid page resources");
gfx.beginDrawing({ x: mediaBox[0], y: mediaBox[1],
width: mediaBox[2] - mediaBox[0],
height: mediaBox[3] - mediaBox[1] });
gfx.execute(this.code, xref, resources);
gfx.endDrawing();
}
};
return constructor;
})();
var Catalog = (function() {
function constructor(xref) {
this.xref = xref;
var obj = xref.getCatalogObj();
assertWellFormed(IsDict(obj), "catalog object is not a dictionary");
this.catDict = obj;
}
constructor.prototype = {
get toplevelPagesDict() {
var obj = this.catDict.get("Pages");
assertWellFormed(IsRef(obj), "invalid top-level pages reference");
var obj = this.xref.fetch(obj);
assertWellFormed(IsDict(obj), "invalid top-level pages dictionary");
// shadow the prototype getter
return shadow(this, "toplevelPagesDict", obj);
},
get numPages() {
var obj = this.toplevelPagesDict.get("Count");
assertWellFormed(IsInt(obj),
"page count in top level pages object is not an integer");
// shadow the prototype getter
return shadow(this, "num", obj);
},
traverseKids: function(pagesDict) {
var pageCache = this.pageCache;
var kids = pagesDict.get("Kids");
assertWellFormed(IsArray(kids),
"page dictionary kids object is not an array");
for (var i = 0; i < kids.length; ++i) {
var kid = kids[i];
assertWellFormed(IsRef(kid),
"page dictionary kid is not a reference");
var obj = this.xref.fetch(kid);
if (IsDict(obj, "Page") || (IsDict(obj) && !obj.has("Kids"))) {
pageCache.push(new Page(this.xref, pageCache.length, obj));
} else { // must be a child page dictionary
assertWellFormed(IsDict(obj),
"page dictionary kid reference points to wrong type of object");
this.traverseKids(obj);
}
}
},
getPage: function(n) {
var pageCache = this.pageCache;
if (!pageCache) {
pageCache = this.pageCache = [];
this.traverseKids(this.toplevelPagesDict);
}
return this.pageCache[n-1];
}
};
return constructor;
})();
var PDFDoc = (function() {
function constructor(stream) {
this.stream = stream;
this.setup();
}
function find(stream, needle, limit, backwards) {
var pos = stream.pos;
var end = stream.end;
var str = "";
if (pos + limit > end)
limit = end - pos;
for (var n = 0; n < limit; ++n)
str += stream.getChar();
stream.pos = pos;
var index = backwards ? str.lastIndexOf(needle) : str.indexOf(needle);
if (index == -1)
return false; /* not found */
stream.pos += index;
return true; /* found */
}
constructor.prototype = {
get linearization() {
var length = this.stream.length;
var linearization = false;
if (length) {
linearization = new Linearization(this.stream);
if (linearization.length != length)
linearization = false;
}
// shadow the prototype getter with a data property
return shadow(this, "linearization", linearization);
},
get startXRef() {
var stream = this.stream;
var startXRef = 0;
var linearization = this.linearization;
if (linearization) {
// Find end of first obj.
stream.reset();
if (find(stream, "endobj", 1024))
startXRef = stream.pos + 6;
} else {
// Find startxref at the end of the file.
var start = stream.end - 1024;
if (start < 0)
start = 0;
stream.pos = start;
if (find(stream, "startxref", 1024, true)) {
stream.skip(9);
var ch;
while (Lexer.isSpace(ch = stream.getChar()))
;
var str = "";
while ((ch - "0") <= 9) {
str += ch;
ch = stream.getChar();
}
startXRef = parseInt(str);
if (isNaN(startXRef))
startXRef = 0;
}
}
// shadow the prototype getter with a data property
return shadow(this, "startXRef", startXRef);
},
get mainXRefEntriesOffset() {
var mainXRefEntriesOffset = 0;
var linearization = this.linearization;
if (linearization)
mainXRefEntriesOffset = linearization.mainXRefEntriesOffset;
// shadow the prototype getter with a data property
return shadow(this, "mainXRefEntriesOffset", mainXRefEntriesOffset);
},
// Find the header, remove leading garbage and setup the stream
// starting from the header.
checkHeader: function() {
var stream = this.stream;
stream.reset();
if (find(stream, "%PDF-", 1024)) {
// Found the header, trim off any garbage before it.
stream.moveStart();
return;
}
// May not be a PDF file, continue anyway.
},
setup: function(ownerPassword, userPassword) {
this.checkHeader();
this.xref = new XRef(this.stream,
this.startXRef,
this.mainXRefEntriesOffset);
this.catalog = new Catalog(this.xref);
},
get numPages() {
var linearization = this.linearization;
var num = linearization
? linearization.numPages
: this.catalog.numPages;
// shadow the prototype getter
return shadow(this, "numPages", num);
},
getPage: function(n) {
var linearization = this.linearization;
// assert(!linearization, "linearized page access not implemented");
return this.catalog.getPage(n);
}
};
return constructor;
})();
const IDENTITY_MATRIX = [ 1, 0, 0, 1, 0, 0 ];
// <canvas> contexts store most of the state we need natively.
// However, PDF needs a bit more state, which we store here.
var CanvasExtraState = (function() {
function constructor() {
// Are soft masks and alpha values shapes or opacities?
this.alphaIsShape = false;
this.fontSize = 0.0;
this.textMatrix = IDENTITY_MATRIX;
this.leading = 0.0;
this.colorSpace = null;
// Current point (in user coordinates)
this.x = 0.0;
this.y = 0.0;
// Start of text line (in text coordinates)
this.lineX = 0.0;
this.lineY = 0.0;
}
constructor.prototype = {
};
return constructor;
})();
const Encodings = {
get ExpertEncoding() {
return shadow(this, "ExpertEncoding", [ ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"space","exclamsmall","Hungarumlautsmall",,"dollaroldstyle","dollarsuperior",
"ampersandsmall","Acutesmall","parenleftsuperior","parenrightsuperior",
"twodotenleader","onedotenleader","comma","hyphen","period","fraction",
"zerooldstyle","oneoldstyle","twooldstyle","threeoldstyle","fouroldstyle",
"fiveoldstyle","sixoldstyle","sevenoldstyle","eightoldstyle","nineoldstyle",
"colon","semicolon","commasuperior","threequartersemdash","periodsuperior",
"questionsmall",,"asuperior","bsuperior","centsuperior","dsuperior","esuperior",,,
"isuperior",,,"lsuperior","msuperior","nsuperior","osuperior",,,"rsuperior",
"ssuperior","tsuperior",,"ff","fi","fl","ffi","ffl","parenleftinferior",,
"parenrightinferior","Circumflexsmall","hyphensuperior","Gravesmall","Asmall",
"Bsmall","Csmall","Dsmall","Esmall","Fsmall","Gsmall","Hsmall","Ismall","Jsmall",
"Ksmall","Lsmall","Msmall","Nsmall","Osmall","Psmall","Qsmall","Rsmall","Ssmall",
"Tsmall","Usmall","Vsmall","Wsmall","Xsmall","Ysmall","Zsmall","colonmonetary",
"onefitted","rupiah","Tildesmall",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"exclamdownsmall","centoldstyle","Lslashsmall",,,"Scaronsmall","Zcaronsmall",
"Dieresissmall","Brevesmall","Caronsmall",,"Dotaccentsmall",,,"Macronsmall",,,
"figuredash","hypheninferior",,,"Ogoneksmall","Ringsmall","Cedillasmall",,,,
"onequarter","onehalf","threequarters","questiondownsmall","oneeighth",
"threeeighths","fiveeighths","seveneighths","onethird","twothirds",,,
"zerosuperior","onesuperior","twosuperior","threesuperior","foursuperior",
"fivesuperior","sixsuperior","sevensuperior","eightsuperior","ninesuperior",
"zeroinferior","oneinferior","twoinferior","threeinferior","fourinferior",
"fiveinferior","sixinferior","seveninferior","eightinferior","nineinferior",
"centinferior","dollarinferior","periodinferior","commainferior","Agravesmall",
"Aacutesmall","Acircumflexsmall","Atildesmall","Adieresissmall","Aringsmall",
"AEsmall","Ccedillasmall","Egravesmall","Eacutesmall","Ecircumflexsmall",
"Edieresissmall","Igravesmall","Iacutesmall","Icircumflexsmall","Idieresissmall",
"Ethsmall","Ntildesmall","Ogravesmall","Oacutesmall","Ocircumflexsmall",
"Otildesmall","Odieresissmall","OEsmall","Oslashsmall","Ugravesmall",
"Uacutesmall","Ucircumflexsmall","Udieresissmall","Yacutesmall","Thornsmall",
"Ydieresissmall"
]);
},
get MacExpertEncoding() {
return shadow(this, "MacExpertEncoding", [ ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"space","exclamsmall","Hungarumlautsmall","centoldstyle","dollaroldstyle",
"dollarsuperior","ampersandsmall","Acutesmall","parenleftsuperior",
"parenrightsuperior","twodotenleader","onedotenleader","comma","hyphen","period",
"fraction","zerooldstyle","oneoldstyle","twooldstyle","threeoldstyle",
"fouroldstyle","fiveoldstyle","sixoldstyle","sevenoldstyle","eightoldstyle",
"nineoldstyle","colon","semicolon",,"threequartersemdash",,"questionsmall",,,,,
"Ethsmall",,,"onequarter","onehalf","threequarters","oneeighth","threeeighths",
"fiveeighths","seveneighths","onethird","twothirds",,,,,,,"ff","fi","fl","ffi",
"ffl","parenleftinferior",,"parenrightinferior","Circumflexsmall",
"hypheninferior","Gravesmall","Asmall","Bsmall","Csmall","Dsmall","Esmall",
"Fsmall","Gsmall","Hsmall","Ismall","Jsmall","Ksmall","Lsmall","Msmall","Nsmall",
"Osmall","Psmall","Qsmall","Rsmall","Ssmall","Tsmall","Usmall","Vsmall","Wsmall",
"Xsmall","Ysmall","Zsmall","colonmonetary","onefitted","rupiah","Tildesmall",,,
"asuperior","centsuperior",,,,,"Aacutesmall","Agravesmall","Acircumflexsmall",
"Adieresissmall","Atildesmall","Aringsmall","Ccedillasmall","Eacutesmall",
"Egravesmall","Ecircumflexsmall","Edieresissmall","Iacutesmall","Igravesmall",
"Icircumflexsmall","Idieresissmall","Ntildesmall","Oacutesmall","Ogravesmall",
"Ocircumflexsmall","Odieresissmall","Otildesmall","Uacutesmall","Ugravesmall",
"Ucircumflexsmall","Udieresissmall",,"eightsuperior","fourinferior",
"threeinferior","sixinferior","eightinferior","seveninferior","Scaronsmall",,
"centinferior","twoinferior",,"Dieresissmall",,"Caronsmall","osuperior",
"fiveinferior",,"commainferior","periodinferior","Yacutesmall",,"dollarinferior",,
"Thornsmall",,"nineinferior","zeroinferior","Zcaronsmall","AEsmall","Oslashsmall",
"questiondownsmall","oneinferior","Lslashsmall",,,,,,,"Cedillasmall",,,,,,
"OEsmall","figuredash","hyphensuperior",,,,,"exclamdownsmall",,"Ydieresissmall",,
"onesuperior","twosuperior","threesuperior","foursuperior","fivesuperior",
"sixsuperior","sevensuperior","ninesuperior","zerosuperior",,"esuperior",
"rsuperior","tsuperior",,,"isuperior","ssuperior","dsuperior",,,,,,"lsuperior",
"Ogoneksmall","Brevesmall","Macronsmall","bsuperior","nsuperior","msuperior",
"commasuperior","periodsuperior","Dotaccentsmall","Ringsmall",,,
]);
},
get MacRomanEncoding() {
return shadow(this, "MacRomanEncoding", [ ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"space","exclam","quotedbl","numbersign","dollar","percent","ampersand",
"quotesingle","parenleft","parenright","asterisk","plus","comma","hyphen",
"period","slash","zero","one","two","three","four","five","six","seven","eight",
"nine","colon","semicolon","less","equal","greater","question","at","A","B","C",
"D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W",
"X","Y","Z","bracketleft","backslash","bracketright","asciicircum","underscore",
"grave","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r",
"s","t","u","v","w","x","y","z","braceleft","bar","braceright","asciitilde",,
"Adieresis","Aring","Ccedilla","Eacute","Ntilde","Odieresis","Udieresis","aacute",
"agrave","acircumflex","adieresis","atilde","aring","ccedilla","eacute","egrave",
"ecircumflex","edieresis","iacute","igrave","icircumflex","idieresis","ntilde",
"oacute","ograve","ocircumflex","odieresis","otilde","uacute","ugrave",
"ucircumflex","udieresis","dagger","degree","cent","sterling","section","bullet",
"paragraph","germandbls","registered","copyright","trademark","acute","dieresis",
"notequal","AE","Oslash","infinity","plusminus","lessequal","greaterequal","yen",
"mu","partialdiff","summation","product","pi","integral","ordfeminine",
"ordmasculine","Omega","ae","oslash","questiondown","exclamdown","logicalnot",
"radical","florin","approxequal","Delta","guillemotleft","guillemotright",
"ellipsis","space","Agrave","Atilde","Otilde","OE","oe","endash","emdash",
"quotedblleft","quotedblright","quoteleft","quoteright","divide","lozenge",
"ydieresis","Ydieresis","fraction","currency","guilsinglleft","guilsinglright",
"fi","fl","daggerdbl","periodcentered","quotesinglbase","quotedblbase",
"perthousand","Acircumflex","Ecircumflex","Aacute","Edieresis","Egrave","Iacute",
"Icircumflex","Idieresis","Igrave","Oacute","Ocircumflex","apple","Ograve",
"Uacute","Ucircumflex","Ugrave","dotlessi","circumflex","tilde","macron","breve",
"dotaccent","ring","cedilla","hungarumlaut","ogonek","caron"
]);
},
get StandardEncoding() {
return shadow(this, "StandardEncoding", [ ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"space","exclam","quotedbl","numbersign","dollar","percent","ampersand",
"quoteright","parenleft","parenright","asterisk","plus","comma","hyphen","period",
"slash","zero","one","two","three","four","five","six","seven","eight","nine",
"colon","semicolon","less","equal","greater","question","at","A","B","C","D","E",
"F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y",
"Z","bracketleft","backslash","bracketright","asciicircum","underscore",
"quoteleft","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q",
"r","s","t","u","v","w","x","y","z","braceleft","bar","braceright","asciitilde",,,
"exclamdown","cent","sterling","fraction","yen","florin","section","currency",
"quotesingle","quotedblleft","guillemotleft","guilsinglleft","guilsinglright",
"fi","fl",,"endash","dagger","daggerdbl","periodcentered",,"paragraph","bullet",
"quotesinglbase","quotedblbase","quotedblright","guillemotright","ellipsis",
"perthousand",,"questiondown",,"grave","acute","circumflex","tilde","macron",
"breve","dotaccent","dieresis",,"ring","cedilla",,"hungarumlaut","ogonek","caron",
"emdash",,,,,,,,,,,,,,,,,"AE",,"ordfeminine",,,,,"Lslash","Oslash","OE",
"ordmasculine",,,,,,"ae",,,,"dotlessi",,,"lslash","oslash","oe","germandbls",,,
]);
},
get WinAnsiEncoding() {
return shadow(this, "WinAnsiEncoding", [ ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"space","exclam","quotedbl","numbersign","dollar","percent","ampersand",
"quotesingle","parenleft","parenright","asterisk","plus","comma","hyphen",
"period","slash","zero","one","two","three","four","five","six","seven","eight",
"nine","colon","semicolon","less","equal","greater","question","at","A","B","C",
"D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W",
"X","Y","Z","bracketleft","backslash","bracketright","asciicircum","underscore",
"grave","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r",
"s","t","u","v","w","x","y","z","braceleft","bar","braceright","asciitilde",
"bullet","Euro","bullet","quotesinglbase","florin","quotedblbase","ellipsis",
"dagger","daggerdbl","circumflex","perthousand","Scaron","guilsinglleft","OE",
"bullet","Zcaron","bullet","bullet","quoteleft","quoteright","quotedblleft",
"quotedblright","bullet","endash","emdash","tilde","trademark","scaron",
"guilsinglright","oe","bullet","zcaron","Ydieresis","space","exclamdown","cent",
"sterling","currency","yen","brokenbar","section","dieresis","copyright",
"ordfeminine","guillemotleft","logicalnot","hyphen","registered","macron",
"degree","plusminus","twosuperior","threesuperior","acute","mu","paragraph",
"periodcentered","cedilla","onesuperior","ordmasculine","guillemotright",
"onequarter","onehalf","threequarters","questiondown","Agrave","Aacute",
"Acircumflex","Atilde","Adieresis","Aring","AE","Ccedilla","Egrave","Eacute",
"Ecircumflex","Edieresis","Igrave","Iacute","Icircumflex","Idieresis","Eth",
"Ntilde","Ograve","Oacute","Ocircumflex","Otilde","Odieresis","multiply","Oslash",
"Ugrave","Uacute","Ucircumflex","Udieresis","Yacute","Thorn","germandbls",
"agrave","aacute","acircumflex","atilde","adieresis","aring","ae","ccedilla",
"egrave","eacute","ecircumflex","edieresis","igrave","iacute","icircumflex",
"idieresis","eth","ntilde","ograve","oacute","ocircumflex","otilde","odieresis",
"divide","oslash","ugrave","uacute","ucircumflex","udieresis","yacute","thorn",
"ydieresis"
]);
},
get zapfDingbatsEncoding() {
return shadow(this, "zapfDingbatsEncoding", [ ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"space","a1","a2","a202","a3","a4","a5","a119","a118","a117","a11","a12","a13",
"a14","a15","a16","a105","a17","a18","a19","a20","a21","a22","a23","a24","a25",
"a26","a27","a28","a6","a7","a8","a9","a10","a29","a30","a31","a32","a33","a34",
"a35","a36","a37","a38","a39","a40","a41","a42","a43","a44","a45","a46","a47",
"a48","a49","a50","a51","a52","a53","a54","a55","a56","a57","a58","a59","a60",
"a61","a62","a63","a64","a65","a66","a67","a68","a69","a70","a71","a72","a73",
"a74","a203","a75","a204","a76","a77","a78","a79","a81","a82","a83","a84","a97",
"a98","a99","a100",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,"a101","a102","a103","a104",
"a106","a107","a108","a112","a111","a110","a109","a120","a121","a122","a123",
"a124","a125","a126","a127","a128","a129","a130","a131","a132","a133","a134",
"a135","a136","a137","a138","a139","a140","a141","a142","a143","a144","a145",
"a146","a147","a148","a149","a150","a151","a152","a153","a154","a155","a156",
"a157","a158","a159","a160","a161","a163","a164","a196","a165","a192","a166",
"a167","a168","a169","a170","a171","a172","a173","a162","a174","a175","a176",
"a177","a178","a179","a193","a180","a199","a181","a200","a182",,"a201","a183",
"a184","a197","a185","a194","a198","a186","a195","a187","a188","a189","a190",
"a191"
]);
}
};
var CanvasGraphics = (function() {
function constructor(canvasCtx) {
this.ctx = canvasCtx;
this.current = new CanvasExtraState();
this.stateStack = [ ];
this.pendingClip = null;
this.res = null;
this.xobjs = null;
this.map = {
// Graphics state
w: "setLineWidth",
J: "setLineCap",
j: "setLineJoin",
M: "setMiterLimit",
d: "setDash",
ri: "setRenderingIntent",
i: "setFlatness",
gs: "setGState",
q: "save",
Q: "restore",
cm: "transform",
// Path
m: "moveTo",
l: "lineTo",
c: "curveTo",
v: "curveTo2",
y: "curveTo3",
h: "closePath",
re: "rectangle",
S: "stroke",
s: "closeStroke",
f: "fill",
F: "fill",
"f*": "eoFill",
B: "fillStroke",
"B*": "eoFillStroke",
b: "closeFillStroke",
"b*": "closeEOFillStroke",
n: "endPath",
// Clipping
W: "clip",
"W*": "eoClip",
// Text
BT: "beginText",
ET: "endText",
Tc: "setCharSpacing",
Tw: "setWordSpacing",
Tz: "setHScale",
TL: "setLeading",
Tf: "setFont",
Tr: "setTextRenderingMode",
Ts: "setTextRise",
Td: "moveText",
TD: "setLeadingMoveText",
Tm: "setTextMatrix",
"T*": "nextLine",
Tj: "showText",
TJ: "showSpacedText",
"'": "nextLineShowText",
'"': "nextLineSetSpacingShowText",
// Type3 fonts
d0: "setCharWidth",
d1: "setCharWidthAndBounds",
// Color
CS: "setStrokeColorSpace",
cs: "setFillColorSpace",
SC: "setStrokeColor",
SCN: "setStrokeColorN",
sc: "setFillColor",
scn: "setFillColorN",
G: "setStrokeGray",
g: "setFillGray",
RG: "setStrokeRGBColor",
rg: "setFillRGBColor",
K: "setStrokeCMYKColor",
k: "setFillCMYKColor",
// Shading
sh: "shadingFill",
// Images
BI: "beginInlineImage",
// XObjects
Do: "paintXObject",
// Marked content
MP: "markPoint",
DP: "markPointProps",
BMC: "beginMarkedContent",
BDC: "beginMarkedContentProps",
EMC: "endMarkedContent",
// Compatibility
BX: "beginCompat",
EX: "endCompat",
};
}
const LINE_CAP_STYLES = [ "butt", "round", "square" ];
const LINE_JOIN_STYLES = [ "miter", "round", "bevel" ];
const NORMAL_CLIP = {};
const EO_CLIP = {};
// Used for tiling patterns
const PAINT_TYPE_COLORED = 1, PAINT_TYPE_UNCOLORED = 2;
constructor.prototype = {
translateFont: function(fontDict, xref, resources) {
var descriptor = xref.fetch(fontDict.get("FontDescriptor"));
var fontName = descriptor.get("FontName");
assertWellFormed(IsName(fontName), "invalid font name");
fontName = fontName.name.replace("+", "_");
var fontFile = descriptor.get2("FontFile", "FontFile2");
if (!fontFile)
error("FontFile not found for font: " + fontName);
fontFile = xref.fetchIfRef(fontFile);
// Fonts with an embedded cmap but without any assignment in
// it are not yet supported, so ask the fonts loader to ignore
// them to not pay a stupid one sec latence.
var ignoreFont = true;
var encodingMap = {};
var charset = [];
if (fontDict.has("Encoding")) {
ignoreFont = false;
var encoding = xref.fetchIfRef(fontDict.get("Encoding"));
if (IsDict(encoding)) {
// Build a map between codes and glyphs
var differences = encoding.get("Differences");
var index = 0;
for (var j = 0; j < differences.length; j++) {
var data = differences[j];
IsNum(data) ? index = data : encodingMap[index++] = data;
}
// Get the font charset if any
var charset = descriptor.get("CharSet");
if (charset) {
assertWellFormed(IsString(charset), "invalid charset");
charset = charset.split("/");
}
} else if (IsName(encoding)) {
var encoding = Encodings[encoding.name];
if (!encoding)
error("Unknown font encoding");
var index = 0;
for (var j = 0; j < encoding.length; j++) {
encodingMap[index++] = GlyphsUnicode[encoding[j]];
}
var firstChar = xref.fetchIfRef(fontDict.get("FirstChar"));
var widths = xref.fetchIfRef(fontDict.get("Widths"));
assertWellFormed(IsArray(widths) && IsInt(firstChar),
"invalid font Widths or FirstChar");
for (var j = 0; j < widths.length; j++) {
if (widths[j])
charset.push(encoding[j + firstChar]);
}
}
} else if (fontDict.has("ToUnicode")) {
var cmapObj = xref.fetchIfRef(fontDict.get("ToUnicode"));
if (IsName(cmapObj)) {
error("ToUnicode file cmap translation not implemented");
} else if (IsStream(cmapObj)) {
var encoding = Encodings["WinAnsiEncoding"];
var firstChar = xref.fetchIfRef(fontDict.get("FirstChar"));
for (var i = firstChar; i < encoding.length; i++)
encodingMap[i] = new Name(encoding[i]);
var tokens = [];
var token = "";
var buffer = cmapObj.ensureBuffer ? cmapObj.ensureBuffer() : cmapObj;
var cmap = cmapObj.getBytes(buffer.byteLength);
for (var i =0; i < cmap.length; i++) {
var byte = cmap[i];
if (byte == 0x20 || byte == 0x0A || byte == 0x3C || byte == 0x3E) {
switch (token) {
case "useCMap":
error("useCMap is not implemented");
break;
case "beginbfrange":
ignoreFont = false;
case "begincodespacerange":
token = "";
tokens = [];
break;
case "endcodespacerange":
TODO("Support CMap ranges");
break;
case "endbfrange":
for (var j = 0; j < tokens.length; j+=3) {
var startRange = parseInt("0x" + tokens[j]);
var endRange = parseInt("0x" + tokens[j+1]);
var code = parseInt("0x" + tokens[j+2]);
for (var k = startRange; k <= endRange; k++) {
encodingMap[k] = GlyphsUnicode[encoding[code]];
charset.push(encoding[code++]);
}
}
break;
case "beginfbchar":
case "endfbchar":
error("fbchar parsing is not implemented");
break;
default:
if (token.length) {
tokens.push(token);
token = "";
}
break;
}
} else if (byte == 0x5B || byte == 0x5D) {
error("CMAP list parsing is not implemented");
} else {
token += String.fromCharCode(byte);
}
}
}
}
var subType = fontDict.get("Subtype");
var bbox = descriptor.get("FontBBox");
assertWellFormed(IsName(subType) && IsArray(bbox),
"invalid font Subtype or FontBBox");
var properties = {
type: subType.name,
encoding: encodingMap,
charset: charset,
bbox: bbox,
ignore: ignoreFont
};
return {
name: fontName,
file: fontFile,
properties: properties
}
},
beginDrawing: function(mediaBox) {
var cw = this.ctx.canvas.width, ch = this.ctx.canvas.height;
this.ctx.save();
this.ctx.scale(cw / mediaBox.width, -ch / mediaBox.height);
this.ctx.translate(0, -mediaBox.height);
},
execute: function(code, xref, resources) {
var savedXref = this.xref, savedRes = this.res, savedXobjs = this.xobjs;
this.xref = xref;
this.res = resources || new Dict();
this.xobjs = xref.fetchIfRef(this.res.get("XObject")) || new Dict();
code(this);
this.xobjs = savedXobjs;
this.res = savedRes;
this.xref = savedXref;
},
compile: function(stream, xref, resources, fonts) {
var xobjs = xref.fetchIfRef(resources.get("XObject")) || new Dict();
var parser = new Parser(new Lexer(stream), false);
var objpool = [];
function emitArg(arg) {
if (typeof arg == "object" || typeof arg == "string") {
var index = objpool.length;
objpool[index] = arg;
return "objpool[" + index + "]";
}
return arg;
}
var src = "";
var args = [];
var map = this.map;
var obj;
while (!IsEOF(obj = parser.getObj())) {
if (IsCmd(obj)) {
var cmd = obj.cmd;
var fn = map[cmd];
assertWellFormed(fn, "Unknown command '" + cmd + "'");
// TODO figure out how to type-check vararg functions
if (cmd == "Do" && !args[0].code) { // eagerly compile XForm objects
var name = args[0].name;
var xobj = xobjs.get(name);
if (xobj) {
xobj = xref.fetchIfRef(xobj);
assertWellFormed(IsStream(xobj), "XObject should be a stream");
var type = xobj.dict.get("Subtype");
assertWellFormed(IsName(type), "XObject should have a Name subtype");
if ("Form" == type.name) {
args[0].code = this.compile(xobj,
xref,
xobj.dict.get("Resources"),
fonts);
}
}
} else if (cmd == "Tf") { // eagerly collect all fonts
var fontRes = resources.get("Font");
if (fontRes) {
fontRes = xref.fetchIfRef(fontRes);
var font = xref.fetchIfRef(fontRes.get(args[0].name));
assertWellFormed(IsDict(font));
if (!font.translated) {
font.translated = this.translateFont(font, xref, resources);
if (fonts && font.translated) {
// keep track of each font we translated so the caller can
// load them asynchronously before calling display on a page
fonts.push(font.translated);
}
}
}
}
src += "this.";
src += fn;
src += "(";
src += args.map(emitArg).join(",");
src += ");\n";
args.length = 0;
} else {
assertWellFormed(args.length <= 33, "Too many arguments");
args.push(obj);
}
}
var fn = Function("objpool", src);
return function (gfx) { fn.call(gfx, objpool); };
},
endDrawing: function() {
this.ctx.restore();
},
// Graphics state
setLineWidth: function(width) {
this.ctx.lineWidth = width;
},
setLineCap: function(style) {
this.ctx.lineCap = LINE_CAP_STYLES[style];
},
setLineJoin: function(style) {
this.ctx.lineJoin = LINE_JOIN_STYLES[style];
},
setMiterLimit: function(limit) {
this.ctx.miterLimit = limit;
},
setDash: function(dashArray, dashPhase) {
this.ctx.mozDash = dashArray;
this.ctx.mozDashOffset = dashPhase;
},
setRenderingIntent: function(intent) {
TODO("set rendering intent");
},
setFlatness: function(flatness) {
TODO("set flatness");
},
setGState: function(dictName) {
TODO("set graphics state from dict");
},
save: function() {
this.ctx.save();
this.stateStack.push(this.current);
this.current = new CanvasExtraState();
},
restore: function() {
var prev = this.stateStack.pop();
if (prev) {
this.current = prev;
this.ctx.restore();
}
},
transform: function(a, b, c, d, e, f) {
this.ctx.transform(a, b, c, d, e, f);
},
// Path
moveTo: function(x, y) {
this.ctx.moveTo(x, y);
},
lineTo: function(x, y) {
this.ctx.lineTo(x, y);
},
curveTo: function(x1, y1, x2, y2, x3, y3) {
this.ctx.bezierCurveTo(x1, y1, x2, y2, x3, y3);
},
curveTo2: function(x2, y2, x3, y3) {
TODO("'v' operator: need current point in gfx context");
},
curveTo3: function(x1, y1, x3, y3) {
this.curveTo(x1, y1, x3, y3, x3, y3);
},
closePath: function() {
this.ctx.closePath();
},
rectangle: function(x, y, width, height) {
this.ctx.rect(x, y, width, height);
},
stroke: function() {
this.ctx.stroke();
this.consumePath();
},
closeStroke: function() {
this.closePath();
this.stroke();
},
fill: function() {
this.ctx.fill();
this.consumePath();
},
eoFill: function() {
var savedFillRule = this.setEOFillRule();
this.fill();
this.restoreFillRule(savedFillRule);
},
fillStroke: function() {
this.ctx.fill();
this.ctx.stroke();
this.consumePath();
},
eoFillStroke: function() {
var savedFillRule = this.setEOFillRule();
this.fillStroke();
this.restoreFillRule(savedFillRule);
},
closeFillStroke: function() {
return this.fillStroke();
},
closeEOFillStroke: function() {
var savedFillRule = this.setEOFillRule();
this.fillStroke();
this.restoreFillRule(savedFillRule);
},
endPath: function() {
this.consumePath();
},
// Clipping
clip: function() {
this.pendingClip = NORMAL_CLIP;
},
eoClip: function() {
this.pendingClip = EO_CLIP;
},
// Text
beginText: function() {
this.current.textMatrix = IDENTITY_MATRIX;
this.current.x = this.current.lineX = 0;
this.current.y = this.current.lineY = 0;
},
endText: function() {
},
setCharSpacing: function(spacing) {
TODO("character (glyph?) spacing");
},
setWordSpacing: function(spacing) {
TODO("word spacing");
},
setHSpacing: function(scale) {
TODO("horizontal text scale");
},
setLeading: function(leading) {
this.current.leading = leading;
},
setFont: function(fontRef, size) {
var font = this.res.get("Font");
if (!IsDict(font))
return;
font = font.get(fontRef.name);
font = this.xref.fetchIfRef(font);
if (!font)
return;
var fontName = "";
var fontDescriptor = font.get("FontDescriptor");
if (fontDescriptor && fontDescriptor.num) {
var fontDescriptor = this.xref.fetchIfRef(fontDescriptor);
fontName = fontDescriptor.get("FontName").name.replace("+", "_");
Fonts.active = fontName;
}
if (!fontName) {
// TODO: fontDescriptor is not available, fallback to default font
this.current.fontSize = size;
this.ctx.font = this.current.fontSize + 'px sans-serif';
return;
}
this.current.fontSize = size;
this.ctx.font = this.current.fontSize +'px "' + fontName + '"';
},
setTextRenderingMode: function(mode) {
TODO("text rendering mode");
},
setTextRise: function(rise) {
TODO("text rise");
},
moveText: function (x, y) {
this.current.x = this.current.lineX += x;
this.current.y = this.current.lineY += y;
},
setLeadingMoveText: function(x, y) {
this.setLeading(-y);
this.moveText(x, y);
},
setTextMatrix: function(a, b, c, d, e, f) {
this.current.textMatrix = [ a, b, c, d, e, f ];
this.current.x = this.current.lineX = 0;
this.current.y = this.current.lineY = 0;
},
nextLine: function() {
this.moveText(0, this.current.leading);
},
showText: function(text) {
this.ctx.save();
this.ctx.transform.apply(this.ctx, this.current.textMatrix);
this.ctx.scale(1, -1);
this.ctx.translate(0, -2 * this.current.y);
this.ctx.fillText(Fonts.charsToUnicode(text), this.current.x, this.current.y);
this.current.x += this.ctx.measureText(text).width;
this.ctx.restore();
},
showSpacedText: function(arr) {
for (var i = 0; i < arr.length; ++i) {
var e = arr[i];
if (IsNum(e)) {
this.current.x -= e * 0.001 * this.current.fontSize;
} else if (IsString(e)) {
this.showText(e);
} else {
malformed("TJ array element "+ e +" isn't string or num");
}
}
},
nextLineShowText: function(text) {
this.nextLine();
this.showText(text);
},
nextLineSetSpacingShowText: function(wordSpacing, charSpacing, text) {
this.setWordSpacing(wordSpacing);
this.setCharSpacing(charSpacing);
this.nextLineShowText(text);
},
// Type3 fonts
setCharWidth: function(xWidth, yWidth) {
TODO("type 3 fonts ('d0' operator)");
},
setCharWidthAndBounds: function(xWidth, yWidth, llx, lly, urx, ury) {
TODO("type 3 fonts ('d1' operator)");
},
// Color
setStrokeColorSpace: function(space) {
// TODO real impl
},
setFillColorSpace: function(space) {
// TODO real impl
if (space.name === "Pattern")
this.current.colorSpace = "Pattern";
else
this.current.colorSpace = "DeviceRGB";
},
setStrokeColor: function(/*...*/) {
// TODO real impl
if (1 === arguments.length) {
this.setStrokeGray.apply(this, arguments);
} else if (3 === arguments.length) {
this.setStrokeRGBColor.apply(this, arguments);
}
},
setStrokeColorN: function(/*...*/) {
// TODO real impl
this.setStrokeColor.apply(this, arguments);
},
setFillColor: function(/*...*/) {
// TODO real impl
if (1 === arguments.length) {
this.setFillGray.apply(this, arguments);
} else if (3 === arguments.length) {
this.setFillRGBColor.apply(this, arguments);
}
},
setFillColorN: function(/*...*/) {
// TODO real impl
var colorSpace = this.current.colorSpace;
if (!colorSpace) {
var stateStack = this.stateStack;
var i = stateStack.length - 1;
while (!colorSpace && i >= 0) {
colorSpace = stateStack[i--].colorSpace;
}
}
if (this.current.colorSpace == "Pattern") {
var patternName = arguments[0];
if (IsName(patternName)) {
var xref = this.xref;
var patternRes = xref.fetchIfRef(this.res.get("Pattern"));
if (!patternRes)
error("Unable to find pattern resource");
var pattern = xref.fetchIfRef(patternRes.get(patternName.name));
const types = [null, this.tilingFill];
var typeNum = pattern.dict.get("PatternType");
var patternFn = types[typeNum];
if (!patternFn)
error("Unhandled pattern type");
patternFn.call(this, pattern);
}
} else {
// TODO real impl
this.setFillColor.apply(this, arguments);
}
},
tilingFill: function(pattern) {
function applyMatrix(point, m) {
var x = point[0] * m[0] + point[1] * m[2] + m[4];
var y = point[0] * m[1] + point[1] * m[3] + m[5];
return [x,y];
};
function multiply(m, tm) {
var a = m[0] * tm[0] + m[1] * tm[2];
var b = m[0] * tm[1] + m[1] * tm[3];
var c = m[2] * tm[0] + m[3] * tm[2];
var d = m[2] * tm[1] + m[3] * tm[3];
var e = m[4] * tm[0] + m[5] * tm[2] + tm[4];
var f = m[4] * tm[1] + m[5] * tm[3] + tm[5];
return [a, b, c, d, e, f]
};
this.save();
var dict = pattern.dict;
var ctx = this.ctx;
var paintType = dict.get("PaintType");
switch (paintType) {
case PAINT_TYPE_COLORED:
// should go to default for color space
ctx.fillStyle = this.makeCssRgb(1, 1, 1);
ctx.strokeStyle = this.makeCssRgb(0, 0, 0);
break;
case PAINT_TYPE_UNCOLORED:
default:
error("Unsupported paint type");
}
TODO("TilingType");
var matrix = dict.get("Matrix") || IDENTITY_MATRIX;
var bbox = dict.get("BBox");
var x0 = bbox[0], y0 = bbox[1], x1 = bbox[2], y1 = bbox[3];
var xstep = dict.get("XStep");
var ystep = dict.get("YStep");
// top left corner should correspond to the top left of the bbox
var topLeft = applyMatrix([x0,y0], matrix);
// we want the canvas to be as large as the step size
var botRight = applyMatrix([x0 + xstep, y0 + ystep], matrix);
var tmpCanvas = document.createElement("canvas");
tmpCanvas.width = Math.ceil(botRight[0] - topLeft[0]);
tmpCanvas.height = Math.ceil(botRight[1] - topLeft[1]);
// set the new canvas element context as the graphics context
var tmpCtx = tmpCanvas.getContext("2d");
var savedCtx = ctx;
this.ctx = tmpCtx;
// normalize transform matrix so each step
// takes up the entire tmpCanvas (need to remove white borders)
if (matrix[1] === 0 && matrix[2] === 0) {
matrix[0] = tmpCanvas.width / xstep;
matrix[3] = tmpCanvas.height / ystep;
topLeft = applyMatrix([x0,y0], matrix);
}
// move the top left corner of bounding box to [0,0]
matrix = multiply(matrix, [1, 0, 0, 1, -topLeft[0], -topLeft[1]]);
this.transform.apply(this, matrix);
if (bbox && IsArray(bbox) && 4 == bbox.length) {
this.rectangle.apply(this, bbox);
this.clip();
this.endPath();
}
var xref = this.xref;
var res = xref.fetchIfRef(dict.get("Resources"));
if (!pattern.code)
pattern.code = this.compile(pattern, xref, res, []);
this.execute(pattern.code, xref, res);
this.ctx = savedCtx;
this.restore();
TODO("Inverse pattern is painted");
var pattern = this.ctx.createPattern(tmpCanvas, "repeat");
this.ctx.fillStyle = pattern;
},
setStrokeGray: function(gray) {
this.setStrokeRGBColor(gray, gray, gray);
},
setFillGray: function(gray) {
this.setFillRGBColor(gray, gray, gray);
},
setStrokeRGBColor: function(r, g, b) {
this.ctx.strokeStyle = this.makeCssRgb(r, g, b);
},
setFillRGBColor: function(r, g, b) {
this.ctx.fillStyle = this.makeCssRgb(r, g, b);
},
setStrokeCMYKColor: function(c, m, y, k) {
TODO("CMYK space");
},
setFillCMYKColor: function(c, m, y, k) {
TODO("CMYK space");
},
// Shading
shadingFill: function(entryRef) {
var xref = this.xref;
var res = this.res;
var shadingRes = xref.fetchIfRef(res.get("Shading"));
if (!shadingRes)
error("No shading resource found");
var shading = xref.fetchIfRef(shadingRes.get(entryRef.name));
if (!shading)
error("No shading object found");
this.save();
var bbox = shading.get("BBox");
if (bbox && IsArray(bbox) && 4 == bbox.length) {
this.rectangle.apply(this, bbox);
this.clip();
this.endPath();
}
var cs = shading.get2("ColorSpace", "CS");
TODO("shading-fill color space");
var background = shading.get("Background");
if (background)
TODO("handle background colors");
const types = [null, this.fillFunctionShading,
this.fillAxialShading, this.fillRadialShading];
var typeNum = shading.get("ShadingType");
var fillFn = types[typeNum];
if (!fillFn)
error("Unknown type of shading");
fillFn.apply(this, [shading]);
this.restore();
},
fillAxialShading: function(sh) {
var coordsArr = sh.get("Coords");
var x0 = coordsArr[0], y0 = coordsArr[1],
x1 = coordsArr[2], y1 = coordsArr[3];
var t0 = 0.0, t1 = 1.0;
if (sh.has("Domain")) {
var domainArr = sh.get("Domain");
t0 = domainArr[0], t1 = domainArr[1];
}
var extendStart = false, extendEnd = false;
if (sh.has("Extend")) {
var extendArr = sh.get("Extend");
extendStart = extendArr[0], extendEnd = extendArr[1];
TODO("Support extend");
}
var fnObj = sh.get("Function");
fnObj = this.xref.fetchIfRef(fnObj);
if (IsArray(fnObj))
error("No support for array of functions");
else if (!IsPDFFunction(fnObj))
error("Invalid function");
var fn = new PDFFunction(this.xref, fnObj);
var gradient = this.ctx.createLinearGradient(x0, y0, x1, y1);
// 10 samples seems good enough for now, but probably won't work
// if there are sharp color changes. Ideally, we would implement
// the spec faithfully and add lossless optimizations.
var step = (t1 - t0) / 10;
for (var i = t0; i <= t1; i += step) {
var c = fn.func([i]);
gradient.addColorStop(i, this.makeCssRgb.apply(this, c));
}
this.ctx.fillStyle = gradient;
// HACK to draw the gradient onto an infinite rectangle.
// PDF gradients are drawn across the entire image while
// Canvas only allows gradients to be drawn in a rectangle
// The following bug should allow us to remove this.
// https://bugzilla.mozilla.org/show_bug.cgi?id=664884
this.ctx.fillRect(-1e10, -1e10, 2e10, 2e10);
},
// Images
beginInlineImage: function() {
TODO("inline images");
error("(Stream will not be parsed properly, bailing now)");
// Like an inline stream:
// - key/value pairs up to Cmd(ID)
// - then image data up to Cmd(EI)
},
// XObjects
paintXObject: function(obj) {
var xobj = this.xobjs.get(obj.name);
if (!xobj)
return;
xobj = this.xref.fetchIfRef(xobj);
assertWellFormed(IsStream(xobj), "XObject should be a stream");
var oc = xobj.dict.get("OC");
if (oc) {
TODO("oc for xobject");
}
var opi = xobj.dict.get("OPI");
if (opi) {
TODO("opi for xobject");
}
var type = xobj.dict.get("Subtype");
assertWellFormed(IsName(type), "XObject should have a Name subtype");
if ("Image" == type.name) {
this.paintImageXObject(obj, xobj, false);
} else if ("Form" == type.name) {
this.paintFormXObject(obj, xobj);
} else if ("PS" == type.name) {
warn("(deprecated) PostScript XObjects are not supported");
} else {
malformed("Unknown XObject subtype "+ type.name);
}
},
paintFormXObject: function(ref, stream) {
this.save();
var matrix = stream.dict.get("Matrix");
if (matrix && IsArray(matrix) && 6 == matrix.length)
this.transform.apply(this, matrix);
var bbox = stream.dict.get("BBox");
if (bbox && IsArray(bbox) && 4 == bbox.length) {
this.rectangle.apply(this, bbox);
this.clip();
this.endPath();
}
this.execute(ref.code, this.xref, stream.dict.get("Resources"));
this.restore();
},
paintImageXObject: function(ref, image, inline) {
this.save();
if (image.getParams) {
// JPX/JPEG2000 streams directly contain bits per component
// and color space mode information.
TODO("get params from actual stream");
// var bits = ...
// var colorspace = ...
}
// TODO cache rendered images?
var dict = image.dict;
var w = dict.get2("Width", "W");
var h = dict.get2("Height", "H");
if (w < 1 || h < 1)
error("Invalid image width or height");
var ctx = this.ctx;
// scale the image to the unit square
ctx.scale(1/w, -1/h);
// If the platform can render the image format directly, the
// stream has a getImage property which directly returns a
// suitable DOM Image object.
if (image.getImage) {
var domImage = image.getImage();
ctx.drawImage(domImage, 0, 0, domImage.width, domImage.height,
0, -h, w, h);
this.restore();
return;
}
var interpolate = dict.get2("Interpolate", "I");
if (!IsBool(interpolate))
interpolate = false;
var imageMask = dict.get2("ImageMask", "IM");
if (!IsBool(imageMask))
imageMask = false;
var bitsPerComponent = image.bitsPerComponent;
if (!bitsPerComponent) {
bitsPerComponent = dict.get2("BitsPerComponent", "BPC");
if (!bitsPerComponent) {
if (imageMask)
bitsPerComponent = 1;
else
error("Bits per component missing in image");
}
}
if (bitsPerComponent !== 8)
error("Unsupported bpc");
var xref = this.xref;
var colorSpaces = this.colorSpaces;
if (imageMask) {
error("support image masks");
}
// actual image
var csStream = dict.get2("ColorSpace", "CS");
csStream = xref.fetchIfRef(csStream);
if (IsName(csStream) && inline)
csStream = colorSpaces.get(csStream);
var colorSpace = new ColorSpace(xref, csStream);
var decode = dict.get2("Decode", "D");
TODO("create color map");
var mask = image.dict.get("Mask");
mask = xref.fetchIfRef(mask);
var smask = image.dict.get("SMask");
smask = xref.fetchIfRef(smask);
if (IsStream(smask)) {
if (inline)
error("cannot combine smask and inlining");
var maskDict = smask.dict;
var maskW = maskDict.get2("Width", "W");
var maskH = maskDict.get2("Height", "H");
if (!IsNum(maskW) || !IsNum(maskH) || maskW < 1 || maskH < 1)
error("Invalid image width or height");
if (maskW !== w || maskH !== h)
error("Invalid image width or height");
var maskInterpolate = maskDict.get2("Interpolate", "I");
if (!IsBool(maskInterpolate))
maskInterpolate = false;
var maskBPC = maskDict.get2("BitsPerComponent", "BPC");
if (!maskBPC)
error("Invalid image mask bpc");
var maskCsStream = maskDict.get2("ColorSpace", "CS");
maskCsStream = xref.fetchIfRef(maskCsStream);
var maskColorSpace = new ColorSpace(xref, maskCsStream);
if (maskColorSpace.mode !== "DeviceGray")
error("Invalid color space for smask");
var maskDecode = maskDict.get2("Decode", "D");
if (maskDecode)
TODO("Handle mask decode");
// handle matte object
}
var tmpCanvas = document.createElement("canvas");
tmpCanvas.width = w;
tmpCanvas.height = h;
var tmpCtx = tmpCanvas.getContext("2d");
var imgData = tmpCtx.getImageData(0, 0, w, h);
var pixels = imgData.data;
if (bitsPerComponent != 8)
error("unhandled number of bits per component");
if (smask) {
if (maskColorSpace.numComps != 1)
error("Incorrect number of components in smask");
var numComps = colorSpace.numComps;
var imgArray = image.getBytes(numComps * w * h);
var imgIdx = 0;
var smArray = smask.getBytes(w * h);
var smIdx = 0;
var length = 4 * w * h;
switch (numComps) {
case 1:
for (var i = 0; i < length; i += 4) {
var p = imgArray[imgIdx++];
pixels[i] = p;
pixels[i+1] = p;
pixels[i+2] = p;
pixels[i+3] = smArray[smIdx++];
}
break;
case 3:
for (var i = 0; i < length; i += 4) {
pixels[i] = imgArray[imgIdx++];
pixels[i+1] = imgArray[imgIdx++];
pixels[i+2] = imgArray[imgIdx++];
pixels[i+3] = smArray[smIdx++];
}
break;
default:
error("unhandled amount of components per pixel: " + numComps);
}
} else {
var numComps = colorSpace.numComps;
var imgArray = image.getBytes(numComps * w * h);
var imgIdx = 0;
var length = 4 * w * h;
switch (numComps) {
case 1:
for (var i = 0; i < length; i += 4) {
var p = imgArray[imgIdx++];
pixels[i] = p;
pixels[i+1] = p;
pixels[i+2] = p;
pixels[i+3] = 255;
}
break;
case 3:
for (var i = 0; i < length; i += 4) {
pixels[i] = imgArray[imgIdx++];
pixels[i+1] = imgArray[imgIdx++];
pixels[i+2] = imgArray[imgIdx++];
pixels[i+3] = 255;
}
break;
default:
error("unhandled amount of components per pixel: " + numComps);
}
}
tmpCtx.putImageData(imgData, 0, 0);
ctx.drawImage(tmpCanvas, 0, -h);
this.restore();
},
// Marked content
markPoint: function(tag) {
TODO("Marked content");
},
markPointProps: function(tag, properties) {
TODO("Marked content");
},
beginMarkedContent: function(tag) {
TODO("Marked content");
},
beginMarkedContentProps: function(tag, properties) {
TODO("Marked content");
},
endMarkedContent: function() {
TODO("Marked content");
},
// Compatibility
beginCompat: function() {
TODO("ignore undefined operators (should we do that anyway?)");
},
endCompat: function() {
TODO("stop ignoring undefined operators");
},
// Helper functions
consumePath: function() {
if (this.pendingClip) {
var savedFillRule = null;
if (this.pendingClip == EO_CLIP)
savedFillRule = this.setEOFillRule();
this.ctx.clip();
this.pendingClip = null;
if (savedFillRule !== null)
this.restoreFillRule(savedFillRule);
}
this.ctx.beginPath();
},
makeCssRgb: function(r, g, b) {
var ri = (255 * r) | 0, gi = (255 * g) | 0, bi = (255 * b) | 0;
return "rgb("+ ri +","+ gi +","+ bi +")";
},
// We generally keep the canvas context set for
// nonzero-winding, and just set evenodd for the operations
// that need them.
setEOFillRule: function() {
var savedFillRule = this.ctx.mozFillRule;
this.ctx.mozFillRule = "evenodd";
return savedFillRule;
},
restoreFillRule: function(rule) {
this.ctx.mozFillRule = rule;
}
};
return constructor;
})();
var ColorSpace = (function() {
function constructor(xref, cs) {
if (IsName(cs)) {
var mode = cs.name;
this.mode = mode;
switch(mode) {
case "DeviceGray":
case "G":
this.numComps = 1;
break;
case "DeviceRGB":
this.numComps = 3;
break;
}
TODO("fill in color space constructor");
} else if (IsArray(cs)) {
var mode = cs[0].name;
this.mode = mode;
var stream = cs[1];
stream = xref.fetchIfRef(stream);
switch (mode) {
case "DeviceGray":
case "G":
this.stream = stream;
this.dict = stream.dict;
this.numComps = 1;
break;
case "ICCBased":
var dict = stream.dict;
this.stream = stream;
this.dict = dict;
this.numComps = dict.get("N");
break;
default:
error("unrecognized color space object");
}
} else {
error("unrecognized color space object");
}
};
constructor.prototype = {
};
return constructor;
})();
var PDFFunction = (function() {
function constructor(xref, fn) {
var dict = fn.dict;
if (!dict)
dict = fn;
const types = [this.constructSampled, null,
this.constructInterpolated, this.constructStiched,
this.constructPostScript];
var typeNum = dict.get("FunctionType");
var typeFn = types[typeNum];
if (!typeFn)
error("Unknown type of function");
typeFn.apply(this, [fn, dict]);
};
constructor.prototype = {
constructSampled: function(str, dict) {
var domain = dict.get("Domain");
var range = dict.get("Range");
if (!domain || !range)
error("No domain or range");
var inputSize = domain.length / 2;
var outputSize = range.length / 2;
if (inputSize != 1)
error("No support for multi-variable inputs to functions");
var size = dict.get("Size");
var bps = dict.get("BitsPerSample");
var order = dict.get("Order");
if (!order)
order = 1;
if (order !== 1)
error ("No support for cubic spline interpolation");
var encode = dict.get("Encode");
if (!encode) {
encode = [];
for (var i = 0; i < inputSize; ++i) {
encode.push(0);
encode.push(size[i] - 1);
}
}
var decode = dict.get("Decode");
if (!decode)
decode = range;
var samples = this.getSampleArray(size, outputSize, bps, str);
this.func = function(args) {
var clip = function(v, min, max) {
if (v > max)
v = max;
else if (v < min)
v = min
return v;
}
if (inputSize != args.length)
error("Incorrect number of arguments");
for (var i = 0; i < inputSize; i++) {
var i2 = i * 2;
// clip to the domain
var v = clip(args[i], domain[i2], domain[i2 + 1]);
// encode
v = encode[i2] + ((v - domain[i2]) *
(encode[i2 + 1] - encode[i2]) /
(domain[i2 + 1] - domain[i2]));
// clip to the size
args[i] = clip(v, 0, size[i] - 1);
}
// interpolate to table
TODO("Multi-dimensional interpolation");
var floor = Math.floor(args[0]);
var ceil = Math.ceil(args[0]);
var scale = args[0] - floor;
floor *= outputSize;
ceil *= outputSize;
var output = [];
for (var i = 0; i < outputSize; ++i) {
if (ceil == floor) {
var v = samples[ceil + i];
} else {
var low = samples[floor + i];
var high = samples[ceil + i];
var v = low * scale + high * (1 - scale);
}
var i2 = i * 2;
// decode
v = decode[i2] + (v * (decode[i2 + 1] - decode[i2]) /
((1 << bps) - 1));
// clip to the domain
output.push(clip(v, range[i2], range[i2 + 1]));
}
return output;
}
},
getSampleArray: function(size, outputSize, bps, str) {
var length = 1;
for (var i = 0; i < size.length; i++)
length *= size[i];
length *= outputSize;
var array = [];
var codeSize = 0;
var codeBuf = 0;
var strBytes = str.getBytes((length * bps + 7) / 8);
var strIdx = 0;
for (var i = 0; i < length; i++) {
var b;
while (codeSize < bps) {
codeBuf <<= 8;
codeBuf |= strBytes[strIdx++];
codeSize += 8;
}
codeSize -= bps
array.push(codeBuf >> codeSize);
codeBuf &= (1 << codeSize) - 1;
}
return array;
},
constructInterpolated: function() {
error("unhandled type of function");
},
constructStiched: function() {
error("unhandled type of function");
},
constructPostScript: function() {
error("unhandled type of function");
}
};
return constructor;
})();
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