Sakurai/pdf.js
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wired up decompression, not working yet

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This commit is contained in:
Andreas Gal 2011-05-11 03:26:33 -07:00
parent cebd567fa1
commit 9543128796
1 changed files with 38 additions and 35 deletions
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73
pdf.js
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@ -23,9 +23,6 @@ var Stream = (function() {
get length() {
return this.bytes.length;
},
reset: function() {
this.pos = this.start;
},
getByte: function() {
var bytes = this.bytes;
if (this.pos >= bytes.length)
@ -50,6 +47,9 @@ var Stream = (function() {
n = 1;
this.pos += n;
},
reset: function() {
this.pos = this.start;
},
moveStart: function() {
this.start = this.pos;
},
@ -667,29 +667,26 @@ var FlateStream = (function() {
[0, 0x0000]
], 5];
function constructor() {
this.reset();
function constructor(stream) {
this.stream = stream;
this.eof = true;
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;
}
constructor.prototype = {
reset: function() {
stream.reset();
this.eof = true;
var cmf = stream.getByte();
var flg = stream.getByte();
if (cmf == -1 || flg == -1)
return;
if ((cmd & 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;
},
getBits: function(bits) {
var stream = this.stream;
var codeSize = this.codeSize;
@ -707,18 +704,19 @@ var FlateStream = (function() {
return b;
},
getCode: function(table) {
var codes = table.codes;
var maxLen = table.maxLen;
var codes = table[0];
var maxLen = table[1];
var codeSize = this.codeSize;
var codeBuf = this.codeBuf;
while (codeSize < maxlen) {
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 = table.codes[codeBuf & ((1 << table.maxLen) - 1)];
var code = codes[codeBuf & ((1 << maxLen) - 1)];
var codeLen = code[0];
var codeVal = code[1];
if (codeSize == 0|| codeSize < codeLen || codeLen == 0)
@ -777,7 +775,7 @@ var FlateStream = (function() {
}
// build the table
var size = 1 << max;
var size = 1 << maxLen;
var codes = new Array(size);
for (var len = 1, code = 0, skip = 2;
len < maxLen;
@ -801,7 +799,7 @@ var FlateStream = (function() {
}
}
return { codes: codes, maxLen: maxLen };
return [codes, maxLen];
},
readBlock: function() {
var stream = this.stream;
@ -879,7 +877,7 @@ var FlateStream = (function() {
} else if (code == 18) {
repeat(codeLengths, i, 7, 11, len = 0);
} else {
codeLenths[i++] = len = code;
codeLengths[i++] = len = code;
}
}
@ -1023,7 +1021,7 @@ function IsArray(v) {
}
function IsStream(v) {
return v instanceof Stream;
return typeof v == "object" && "getChar" in v;
}
function IsRef(v) {
@ -1497,10 +1495,13 @@ var Parser = (function() {
return stream;
},
makeFilter: function(stream, name, params) {
print(name);
if (params)
error("filter params not supported yet");
// TODO
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;
}
};
@ -2721,6 +2722,8 @@ function runParseTests() {
var pdf = new PDFDoc(new Stream(data));
var page = pdf.getPage(1);
var contents = page.contents;
for (var i = 0; i < 100; ++i)
print(contents.getChar());
}
if ("arguments" in this) {