mirror of
https://github.com/mozilla/pdf.js.git
synced 2025-04-28 23:28:16 +02:00
Merge branch 'master' of github.com:andreasgal/pdf.js
This commit is contained in:
sbarman
commit
8705c341d6
17 changed files with 1105 additions and 61 deletions
223
pdf.js
223
pdf.js
|
|
@ -1,11 +1,12 @@
|
|||
/* -*- 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) {
|
||||
msg = msg.toString ? msg.toString() : msg;
|
||||
if (console && console.log)
|
||||
console.log(msg);
|
||||
else if (print)
|
||||
|
|
@ -390,6 +391,12 @@ var FlateStream = (function() {
|
|||
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 stream = this.stream;
|
||||
|
||||
// read block header
|
||||
|
|
@ -450,11 +457,6 @@ var FlateStream = (function() {
|
|||
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);
|
||||
|
|
@ -507,6 +509,94 @@ var FlateStream = (function() {
|
|||
return constructor;
|
||||
})();
|
||||
|
||||
var PredictorStream = (function() {
|
||||
function constructor(stream, params) {
|
||||
this.stream = stream;
|
||||
this.predictor = params.get("Predictor") || 1;
|
||||
if (this.predictor <= 1) {
|
||||
return stream; // no prediction
|
||||
}
|
||||
if (params.has("EarlyChange")) {
|
||||
error("EarlyChange predictor parameter is not supported");
|
||||
}
|
||||
this.colors = params.get("Colors") || 1;
|
||||
this.bitsPerComponent = params.get("BitsPerComponent") || 8;
|
||||
this.columns = params.get("Columns") || 1;
|
||||
if (this.colors !== 1 || this.bitsPerComponent !== 8) {
|
||||
error("Multi-color and multi-byte predictors are not supported");
|
||||
}
|
||||
if (this.predictor < 10 || this.predictor > 15) {
|
||||
error("Unsupported predictor");
|
||||
}
|
||||
this.currentRow = new Uint8Array(this.columns);
|
||||
this.pos = 0;
|
||||
this.bufferLength = 0;
|
||||
}
|
||||
|
||||
constructor.prototype = {
|
||||
readRow : function() {
|
||||
var lastRow = this.currentRow;
|
||||
var predictor = this.stream.getByte();
|
||||
var currentRow = this.stream.getBytes(this.columns), i;
|
||||
switch (predictor) {
|
||||
default:
|
||||
error("Unsupported predictor");
|
||||
break;
|
||||
case 0:
|
||||
break;
|
||||
case 2:
|
||||
for (i = 0; i < currentRow.length; ++i) {
|
||||
currentRow[i] = (lastRow[i] + currentRow[i]) & 0xFF;
|
||||
}
|
||||
break;
|
||||
}
|
||||
this.pos = 0;
|
||||
this.bufferLength = currentRow.length;
|
||||
this.currentRow = currentRow;
|
||||
},
|
||||
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
|
||||
|
|
@ -523,9 +613,6 @@ var Name = (function() {
|
|||
}
|
||||
|
||||
constructor.prototype = {
|
||||
toString: function() {
|
||||
return this.name;
|
||||
}
|
||||
};
|
||||
|
||||
return constructor;
|
||||
|
|
@ -537,9 +624,6 @@ var Cmd = (function() {
|
|||
}
|
||||
|
||||
constructor.prototype = {
|
||||
toString: function() {
|
||||
return this.cmd;
|
||||
}
|
||||
};
|
||||
|
||||
return constructor;
|
||||
|
|
@ -566,12 +650,6 @@ var Dict = (function() {
|
|||
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;
|
||||
}
|
||||
};
|
||||
|
||||
|
|
@ -738,6 +816,7 @@ var Lexer = (function() {
|
|||
var done = false;
|
||||
var str = "";
|
||||
var stream = this.stream;
|
||||
var ch;
|
||||
do {
|
||||
switch (ch = stream.getChar()) {
|
||||
case undefined:
|
||||
|
|
@ -1098,7 +1177,9 @@ var Parser = (function() {
|
|||
this.encAlgorithm,
|
||||
this.keyLength);
|
||||
}
|
||||
return this.filter(stream, dict);
|
||||
stream = this.filter(stream, dict);
|
||||
stream.parameters = dict;
|
||||
return stream;
|
||||
},
|
||||
filter: function(stream, dict) {
|
||||
var filter = dict.get2("Filter", "F");
|
||||
|
|
@ -1123,8 +1204,9 @@ var Parser = (function() {
|
|||
},
|
||||
makeFilter: function(stream, name, params) {
|
||||
if (name == "FlateDecode" || name == "Fl") {
|
||||
if (params)
|
||||
error("params not supported yet for FlateDecode");
|
||||
if (params) {
|
||||
return new PredictorStream(new FlateStream(stream), params);
|
||||
}
|
||||
return new FlateStream(stream);
|
||||
} else {
|
||||
error("filter '" + name + "' not supported yet");
|
||||
|
|
@ -1217,10 +1299,10 @@ var XRef = (function() {
|
|||
this.stream = stream;
|
||||
this.entries = [];
|
||||
this.xrefstms = {};
|
||||
this.readXRef(startXRef);
|
||||
var trailerDict = this.readXRef(startXRef);
|
||||
|
||||
// get the root dictionary (catalog) object
|
||||
if (!IsRef(this.root = this.trailerDict.get("Root")))
|
||||
if (!IsRef(this.root = trailerDict.get("Root")))
|
||||
error("Invalid root reference");
|
||||
|
||||
// prepare the XRef cache
|
||||
|
|
@ -1275,18 +1357,18 @@ var XRef = (function() {
|
|||
error("Invalid XRef table");
|
||||
|
||||
// get the 'Prev' pointer
|
||||
var more = false;
|
||||
var prev;
|
||||
obj = dict.get("Prev");
|
||||
if (IsInt(obj)) {
|
||||
this.prev = obj;
|
||||
more = true;
|
||||
prev = obj;
|
||||
} else if (IsRef(obj)) {
|
||||
// certain buggy PDF generators generate "/Prev NNN 0 R" instead
|
||||
// of "/Prev NNN"
|
||||
this.prev = obj.num;
|
||||
more = true;
|
||||
prev = obj.num;
|
||||
}
|
||||
if (prev) {
|
||||
this.readXRef(prev);
|
||||
}
|
||||
this.trailerDict = dict;
|
||||
|
||||
// check for 'XRefStm' key
|
||||
if (IsInt(obj = dict.get("XRefStm"))) {
|
||||
|
|
@ -1296,11 +1378,64 @@ var XRef = (function() {
|
|||
this.xrefstms[pos] = 1; // avoid infinite recursion
|
||||
this.readXRef(pos);
|
||||
}
|
||||
|
||||
return more;
|
||||
return dict;
|
||||
},
|
||||
readXRefStream: function(parser) {
|
||||
error("Invalid XRef stream");
|
||||
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();
|
||||
}
|
||||
for (j = 0; j < offsetFieldWidth; ++j) {
|
||||
offset = (offset << 8) | stream.getByte();
|
||||
}
|
||||
for (j = 0; j < generationFieldWidth; ++j) {
|
||||
generation = (generation << 8) | stream.getByte();
|
||||
}
|
||||
var entry = { offset: offset, gen: generation };
|
||||
if (typeFieldWidth > 0) {
|
||||
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;
|
||||
|
|
@ -1442,7 +1577,7 @@ var Catalog = (function() {
|
|||
return shadow(this, "toplevelPagesDict", obj);
|
||||
},
|
||||
get numPages() {
|
||||
obj = this.toplevelPagesDict.get("Count");
|
||||
var obj = this.toplevelPagesDict.get("Count");
|
||||
assertWellFormed(IsInt(obj),
|
||||
"page count in top level pages object is not an integer");
|
||||
// shadow the prototype getter
|
||||
|
|
@ -1584,7 +1719,7 @@ var PDFDoc = (function() {
|
|||
},
|
||||
getPage: function(n) {
|
||||
var linearization = this.linearization;
|
||||
assert(!linearization, "linearized page access not implemented");
|
||||
// assert(!linearization, "linearized page access not implemented");
|
||||
return this.catalog.getPage(n);
|
||||
}
|
||||
};
|
||||
|
|
@ -1925,9 +2060,11 @@ var CanvasGraphics = (function() {
|
|||
|
||||
// Get the font charset if any
|
||||
var charset = descriptor.get("CharSet");
|
||||
assertWellFormed(IsString(charset), "invalid charset");
|
||||
if (charset) {
|
||||
assertWellFormed(IsString(charset), "invalid charset");
|
||||
|
||||
charset = charset.split("/");
|
||||
charset = charset.split("/");
|
||||
}
|
||||
} else if (IsName(encoding)) {
|
||||
var encoding = Encodings[encoding.name];
|
||||
if (!encoding)
|
||||
|
|
@ -1935,7 +2072,7 @@ var CanvasGraphics = (function() {
|
|||
|
||||
var widths = xref.fetchIfRef(fontDict.get("Widths"));
|
||||
var firstChar = xref.fetchIfRef(fontDict.get("FirstChar"));
|
||||
assertWellFormed(IsArray(widths) && IsInteger(firstChar),
|
||||
assertWellFormed(IsArray(widths) && IsInt(firstChar),
|
||||
"invalid font Widths or FirstChar");
|
||||
var charset = [];
|
||||
for (var j = 0; j < widths.length; j++) {
|
||||
|
|
@ -2245,13 +2382,7 @@ var CanvasGraphics = (function() {
|
|||
this.ctx.translate(0, 2 * this.current.y);
|
||||
this.ctx.scale(1, -1);
|
||||
this.ctx.transform.apply(this.ctx, this.current.textMatrix);
|
||||
|
||||
// Replace characters code by glyphs code
|
||||
var glyphs = [];
|
||||
for (var i = 0; i < text.length; i++)
|
||||
glyphs[i] = String.fromCharCode(Fonts.unicodeFromCode(text[i].charCodeAt(0)));
|
||||
|
||||
this.ctx.fillText(glyphs.join(""), this.current.x, this.current.y);
|
||||
this.ctx.fillText(Fonts.chars2Unicode(text), this.current.x, this.current.y);
|
||||
this.current.x += this.ctx.measureText(text).width;
|
||||
|
||||
this.ctx.restore();
|
||||
|
|
@ -2400,7 +2531,7 @@ var CanvasGraphics = (function() {
|
|||
error("No support for array of functions");
|
||||
else if (!IsPDFFunction(fnObj))
|
||||
error("Invalid function");
|
||||
fn = new PDFFunction(this.xref, fnObj);
|
||||
var fn = new PDFFunction(this.xref, fnObj);
|
||||
|
||||
var gradient = this.ctx.createLinearGradient(x0, y0, x1, y1);
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue