/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- /
/* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
var ERRORS = 0, WARNINGS = 1, TODOS = 5;
var verbosity = WARNINGS;
function log(msg) {
msg = msg.toString ? msg.toString() : 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;
}
var Stream = (function() {
function constructor(arrayBuffer, start, length, dict) {
this.bytes = new 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 > 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 = new 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 = new Uint32Array([
16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
]);
const lengthDecode = new 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 = new 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 = [new 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 = [new 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) {
this.stream = stream;
this.dict = stream.dict;
var cmf = stream.getByte();
var flg = stream.getByte();
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.eof = false;
this.codeSize = 0;
this.codeBuf = 0;
this.pos = 0;
this.bufferLength = 0;
}
constructor.prototype = {
getBits: function(bits) {
var stream = this.stream;
var codeSize = this.codeSize;
var codeBuf = this.codeBuf;
var b;
while (codeSize < bits) {
if ((b = stream.getByte()) == -1)
error("Bad encoding in flate stream");
codeBuf |= b << codeSize;
codeSize += 8;
}
b = codeBuf & ((1 << bits) - 1);
this.codeBuf = codeBuf >> bits;
this.codeSize = codeSize -= bits;
return b;
},
getCode: function(table) {
var codes = table[0];
var maxLen = table[1];
var codeSize = this.codeSize;
var codeBuf = this.codeBuf;
var stream = this.stream;
while (codeSize < maxLen) {
var b;
if ((b = stream.getByte()) == -1)
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);
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 = new Uint8Array(size);
for (var i = 0; i < current; ++i)
buffer2[i] = buffer[i];
return this.buffer = buffer2;
},
getByte: function() {
var bufferLength = this.bufferLength;
var pos = this.pos;
if (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 bufferLength = this.bufferLength;
var pos = this.pos;
if (bufferLength == pos) {
if (this.eof)
return;
this.readBlock();
}
return String.fromCharCode(this.buffer[pos]);
},
getChar: function() {
var ch = this.lookChar();
if (!ch)
return;
this.pos++;
return ch;
},
skip: function(n) {
if (!n)
n = 1;
while (n-- > 0)
this.getChar();
},
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 = new 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() {
var stream = this.stream;
// read block header
var hdr = this.getBits(3);
if (hdr & 1)
this.eof = true;
hdr >>= 1;
var b;
if (hdr == 0) { // uncompressed block
if ((b = stream.getByte()) == -1)
error("Bad block header in flate stream");
var blockLen = b;
if ((b = stream.getByte()) == -1)
error("Bad block header in flate stream");
blockLen |= (b << 8);
if ((b = stream.getByte()) == -1)
error("Bad block header in flate stream");
var check = b;
if ((b = stream.getByte()) == -1)
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 ((b = stream.getByte()) == -1) {
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) {
function repeat(stream, array, len, offset, what) {
var repeat = stream.getBits(len) + offset;
while (repeat-- > 0)
array[i++] = what;
}
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;
})();
var DecryptStream = (function() {
function constructor(str, fileKey, encAlgorithm, keyLength) {
// TODO
}
constructor.prototype = Stream.prototype;
return constructor;
})();
var Name = (function() {
function constructor(name) {
this.name = name;
}
constructor.prototype = {
toString: function() {
return this.name;
}
};
return constructor;
})();
var Cmd = (function() {
function constructor(cmd) {
this.cmd = cmd;
}
constructor.prototype = {
toString: function() {
return this.cmd;
}
};
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);
},
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]);
},
toString: function() {
var keys = [];
for (var key in this.map)
keys.push(key);
return "Dict with " + keys.length + " keys: " + keys;
}
};
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 IsFunction(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");
}
function IsFunctionDict(v) {
return IsFunction(v) && IsDict(v);
}
function IsFunctionStream(v) {
return IsFunction(v) && IsStream(v);
}
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;
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');
}
}
x = Fonts.unicodeFromCode(x);
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:
var unicode = Fonts.unicodeFromCode(ch.charCodeAt(0));
str += String.fromCharCode(unicode);
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;
} else if (!ch) {
warn("Unterminated hex string");
break;
} else 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);
}
return this.filter(stream, dict);
},
filter: function(stream, dict) {
var filter = dict.get2("Filter", "F");
var params = dict.get2("DecodeParms", "DP");
if (IsName(filter))
return this.makeFilter(stream, filter.name, params);
if (IsArray(filter)) {
var filterArray = filter;
var paramsArray = params;
for (filter in filterArray) {
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, params);
}
}
}
return stream;
},
makeFilter: function(stream, name, params) {
if (name == "FlateDecode" || name == "Fl") {
if (params)
error("params not supported yet for FlateDecode");
return new FlateStream(stream);
} 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 = {};
this.readXRef(startXRef);
// get the root dictionary (catalog) object
if (!IsRef(this.root = this.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 more = false;
obj = dict.get("Prev");
if (IsInt(obj)) {
this.prev = obj;
more = true;
} else if (IsRef(obj)) {
// certain buggy PDF generators generate "/Prev NNN 0 R" instead
// of "/Prev NNN"
this.prev = obj.num;
more = true;
}
this.trailerDict = dict;
// 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 more;
},
readXRefStream: function(parser) {
error("Invalid XRef stream");
},
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;
if (e.uncompressed) {
if (e.gen != gen)
throw("inconsistent generation in XRef");
var stream = this.stream.makeSubStream(e.offset);
var 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;
}
error("compressed entry");
},
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 contents() {
return shadow(this, "contents", this.pageDict.get("Contents"));
},
get resources() {
return shadow(this, "resources", this.pageDict.get("Resources"));
},
get mediaBox() {
var obj = this.pageDict.get("MediaBox");
return shadow(this, "mediaBox", ((IsArray(obj) && obj.length == 4)
? obj
: null));
},
get fonts() {
var xref = this.xref;
var resources = xref.fetchIfRef(this.resources);
var fontsDict = new Dict();
// Get the fonts use on the page if any
var fontResources = resources.get("Font");
if (IsDict(fontResources)) {
fontResources.forEach(function(fontKey, fontData) {
fontsDict.set(fontKey, xref.fetch(fontData))
});
}
// Get the fonts use on xobjects of the page if any
var xobjs = xref.fetchIfRef(resources.get("XObject"));
if (xobjs) {
xobjs.forEach(function(key, xobj) {
xobj = xref.fetchIfRef(xobj);
assertWellFormed(IsStream(xobj), "XObject should be a stream");
var xobjFonts = xobj.dict.get("Resources").get("Font");
xobjFonts.forEach(function(fontKey, fontData) {
fontsDict.set(fontKey, xref.fetch(fontData))
});
});
}
return shadow(this, "fonts", fontsDict);
},
display: function(gfx) {
var xref = this.xref;
var contents = xref.fetchIfRef(this.contents);
var resources = xref.fetchIfRef(this.resources);
var mediaBox = xref.fetchIfRef(this.mediaBox);
assertWellFormed(IsStream(contents) && IsDict(resources),
"invalid page contents or resources");
gfx.beginDrawing({ x: mediaBox[0], y: mediaBox[1],
width: mediaBox[2] - mediaBox[0],
height: mediaBox[3] - mediaBox[1] });
gfx.interpret(new Parser(new Lexer(contents), false),
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() {
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;
// 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;
})();
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: this.setLineWidth,
J: this.setLineCap,
j: this.setLineJoin,
d: this.setDash,
ri: this.setRenderingIntent,
i: this.setFlatness,
gs: this.setGState,
q: this.save,
Q: this.restore,
cm: this.transform,
// Path
m: this.moveTo,
l: this.lineTo,
c: this.curveTo,
h: this.closePath,
re: this.rectangle,
S: this.stroke,
f: this.fill,
"f*": this.eoFill,
B: this.fillStroke,
b: this.closeFillStroke,
n: this.endPath,
// Clipping
W: this.clip,
"W*": this.eoClip,
// Text
BT: this.beginText,
ET: this.endText,
TL: this.setLeading,
Tf: this.setFont,
Td: this.moveText,
Tm: this.setTextMatrix,
"T*": this.nextLine,
Tj: this.showText,
TJ: this.showSpacedText,
// Type3 fonts
// Color
CS: this.setStrokeColorSpace,
cs: this.setFillColorSpace,
SC: this.setStrokeColor,
SCN: this.setStrokeColorN,
sc: this.setFillColor,
scn: this.setFillColorN,
G: this.setStrokeGray,
g: this.setFillGray,
RG: this.setStrokeRGBColor,
rg: this.setFillRGBColor,
// Shading
sh: this.shadingFill,
// Images
// XObjects
Do: this.paintXObject,
// Marked content
// Compatibility
};
}
const LINE_CAP_STYLES = [ "butt", "round", "square" ];
const LINE_JOIN_STYLES = [ "miter", "round", "bevel" ];
const NORMAL_CLIP = {};
const EO_CLIP = {};
constructor.prototype = {
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);
},
interpret: function(parser, xref, resources) {
var savedXref = this.xref, savedRes = this.res, savedXobjs = this.xobjs;
this.xref = xref;
this.res = resources || new Dict();
this.xobjs = this.res.get("XObject") || new Dict();
this.xobjs = this.xref.fetchIfRef(this.xobjs);
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
fn.apply(this, args);
args.length = 0;
} else {
assertWellFormed(args.length <= 33, "Too many arguments");
args.push(obj);
}
}
this.xobjs = savedXobjs;
this.res = savedRes;
this.xref = savedXref;
},
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];
},
setDash: function(dashArray, dashPhase) {
TODO("set dash");
},
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);
},
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();
},
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();
},
closeFillStroke: function() {
return this.fillStroke();
},
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() {
},
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.num) {
var fontDescriptor = this.xref.fetchIfRef(fontDescriptor);
fontName = fontDescriptor.get("FontName").name.replace("+", "_");
Fonts.active = fontName;
}
this.current.fontSize = size;
this.ctx.font = this.current.fontSize +'px "' + fontName + '"';
},
moveText: function (x, y) {
this.current.x = this.current.lineX += x;
this.current.y = this.current.lineY += 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.translate(0, 2 * this.current.y);
this.ctx.scale(1, -1);
this.ctx.transform.apply(this.ctx, this.current.textMatrix);
this.ctx.fillText(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");
}
}
},
// Type3 fonts
// Color
setStrokeColorSpace: function(space) {
// TODO real impl
},
setFillColorSpace: function(space) {
// TODO real impl
},
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
this.setFillColor.apply(this, arguments);
},
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);
},
// Shading
shadingFill: function(entryRef) {
var shadingRes = this.res.get("Shading");
if (!shadingRes)
return;
shadingRes = this.xref.fetchIfRef(shadingRes);
var shading = shadingRes.get(entryRef.name);
if (!shading)
return;
shading = this.xref.fetchIfRef(shading);
if (!shading)
return;
this.save();
var bbox = shading.get("BBox");
if (bbox && IsArray(bbox) && 4 == bbox.length) {
this.rectangle.apply(this, bbox);
this.clip();
this.endPath();
}
TODO("shading-fill color space");
var type = shading.get("ShadingType");
switch (type) {
case 1:
this.fillFunctionShading(shading);
break;
case 2:
this.fillAxialShading(shading);
break;
case 3:
this.fillRadialShading(shading);
break;
case 4: case 5: case 6: case 7:
TODO("shading fill type "+ type);
default:
malformed("Unknown shading type "+ type);
}
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];
}
var fn = sh.get("Function");
fn = this.xref.fetchIfRef(fn);
var gradient = this.ctx.createLinearGradient(x0, y0, x1, y1);
gradient.addColorStop(0, 'rgb(0,0,255)');
gradient.addColorStop(1, 'rgb(0,255,0)');
this.ctx.fillStyle = gradient;
this.ctx.fill();
this.consumePath();
},
// 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(xobj, false);
} else if ("Form" == type.name) {
this.paintFormXObject(xobj);
} else if ("PS" == type.name) {
warn("(deprecated) PostScript XObjects are not supported");
} else {
malformed("Unknown XObject subtype "+ type.name);
}
},
paintFormXObject: function(form) {
this.save();
var matrix = form.dict.get("Matrix");
if (matrix && IsArray(matrix) && 6 == matrix.length)
this.transform.apply(this, matrix);
var bbox = form.dict.get("BBox");
if (bbox && IsArray(bbox) && 4 == bbox.length) {
this.rectangle.apply(this, bbox);
this.clip();
this.endPath();
}
this.interpret(new Parser(new Lexer(form), false),
this.xref, form.dict.get("Resources"));
this.restore();
},
paintImageXObject: function(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);
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
} else {
smask = null;
}
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[imageIdx++];
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[imageIdx++];
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, 0);
this.restore();
},
// 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;
}
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;
})();