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This commit is contained in:
Vivien Nicolas 2011-06-21 03:01:59 +02:00
parent d923953ee3
commit ab4ecdcb73
1 changed files with 97 additions and 36 deletions
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pdf.js
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@ -48,6 +48,14 @@ function shadow(obj, prop, value) {
return value; 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() { var Stream = (function() {
function constructor(arrayBuffer, start, length, dict) { function constructor(arrayBuffer, start, length, dict) {
this.bytes = Uint8Array(arrayBuffer); this.bytes = Uint8Array(arrayBuffer);
@ -74,9 +82,9 @@ var Stream = (function() {
var pos = this.pos; var pos = this.pos;
var end = pos + length; var end = pos + length;
var strEnd = this.end; var strEnd = this.end;
if (end > strEnd) if (!end || end > strEnd)
end = strEnd; end = strEnd;
this.pos = end; this.pos = end;
return bytes.subarray(pos, end); return bytes.subarray(pos, end);
}, },
@ -233,10 +241,12 @@ var FlateStream = (function() {
]), 5]; ]), 5];
function constructor(stream) { function constructor(stream) {
this.stream = stream; var bytes = stream.getBytes();
var bytesPos = 0;
this.dict = stream.dict; this.dict = stream.dict;
var cmf = stream.getByte(); var cmf = bytes[bytesPos++];
var flg = stream.getByte(); var flg = bytes[bytesPos++];
if (cmf == -1 || flg == -1) if (cmf == -1 || flg == -1)
error("Invalid header in flate stream"); error("Invalid header in flate stream");
if ((cmf & 0x0f) != 0x08) if ((cmf & 0x0f) != 0x08)
@ -245,6 +255,9 @@ var FlateStream = (function() {
error("Bad FCHECK in flate stream"); error("Bad FCHECK in flate stream");
if (flg & 0x20) if (flg & 0x20)
error("FDICT bit set in flate stream"); error("FDICT bit set in flate stream");
this.bytes = bytes;
this.bytesPos = bytesPos;
this.eof = false; this.eof = false;
this.codeSize = 0; this.codeSize = 0;
this.codeBuf = 0; this.codeBuf = 0;
@ -255,12 +268,14 @@ var FlateStream = (function() {
constructor.prototype = { constructor.prototype = {
getBits: function(bits) { getBits: function(bits) {
var stream = this.stream;
var codeSize = this.codeSize; var codeSize = this.codeSize;
var codeBuf = this.codeBuf; var codeBuf = this.codeBuf;
var bytes = this.bytes;
var bytesPos = this.bytesPos;
var b; var b;
while (codeSize < bits) { while (codeSize < bits) {
if ((b = stream.getByte()) == -1) if (typeof (b = bytes[bytesPos++]) == "undefined")
error("Bad encoding in flate stream"); error("Bad encoding in flate stream");
codeBuf |= b << codeSize; codeBuf |= b << codeSize;
codeSize += 8; codeSize += 8;
@ -268,6 +283,7 @@ var FlateStream = (function() {
b = codeBuf & ((1 << bits) - 1); b = codeBuf & ((1 << bits) - 1);
this.codeBuf = codeBuf >> bits; this.codeBuf = codeBuf >> bits;
this.codeSize = codeSize -= bits; this.codeSize = codeSize -= bits;
this.bytesPos = bytesPos;
return b; return b;
}, },
getCode: function(table) { getCode: function(table) {
@ -275,10 +291,12 @@ var FlateStream = (function() {
var maxLen = table[1]; var maxLen = table[1];
var codeSize = this.codeSize; var codeSize = this.codeSize;
var codeBuf = this.codeBuf; var codeBuf = this.codeBuf;
var stream = this.stream; var bytes = this.bytes;
var bytesPos = this.bytesPos;
while (codeSize < maxLen) { while (codeSize < maxLen) {
var b; var b;
if ((b = stream.getByte()) == -1) if (typeof (b = bytes[bytesPos++]) == "undefined")
error("Bad encoding in flate stream"); error("Bad encoding in flate stream");
codeBuf |= (b << codeSize); codeBuf |= (b << codeSize);
codeSize += 8; codeSize += 8;
@ -290,6 +308,7 @@ var FlateStream = (function() {
error("Bad encoding in flate stream"); error("Bad encoding in flate stream");
this.codeBuf = (codeBuf >> codeLen); this.codeBuf = (codeBuf >> codeLen);
this.codeSize = (codeSize - codeLen); this.codeSize = (codeSize - codeLen);
this.bytesPos = bytesPos;
return codeVal; return codeVal;
}, },
ensureBuffer: function(requested) { ensureBuffer: function(requested) {
@ -306,9 +325,8 @@ var FlateStream = (function() {
return this.buffer = buffer2; return this.buffer = buffer2;
}, },
getByte: function() { getByte: function() {
var bufferLength = this.bufferLength;
var pos = this.pos; var pos = this.pos;
if (bufferLength <= pos) { while (this.bufferLength <= pos) {
if (this.eof) if (this.eof)
return; return;
this.readBlock(); this.readBlock();
@ -331,9 +349,8 @@ var FlateStream = (function() {
return this.buffer.subarray(pos, end) return this.buffer.subarray(pos, end)
}, },
lookChar: function() { lookChar: function() {
var bufferLength = this.bufferLength;
var pos = this.pos; var pos = this.pos;
if (bufferLength <= pos) { while (this.bufferLength <= pos) {
if (this.eof) if (this.eof)
return; return;
this.readBlock(); this.readBlock();
@ -342,16 +359,15 @@ var FlateStream = (function() {
}, },
getChar: function() { getChar: function() {
var ch = this.lookChar(); var ch = this.lookChar();
if (!ch) // shouldnt matter what the position is if we get past the eof
return; // so no need to check if ch is undefined
this.pos++; this.pos++;
return ch; return ch;
}, },
skip: function(n) { skip: function(n) {
if (!n) if (!n)
n = 1; n = 1;
while (n-- > 0) this.pos += n;
this.getChar();
}, },
generateHuffmanTable: function(lengths) { generateHuffmanTable: function(lengths) {
var n = lengths.length; var n = lengths.length;
@ -397,7 +413,8 @@ var FlateStream = (function() {
array[i++] = what; array[i++] = what;
} }
var stream = this.stream; var bytes = this.bytes;
var bytesPos = this.bytesPos;
// read block header // read block header
var hdr = this.getBits(3); var hdr = this.getBits(3);
@ -407,16 +424,16 @@ var FlateStream = (function() {
var b; var b;
if (hdr == 0) { // uncompressed block if (hdr == 0) { // uncompressed block
if ((b = stream.getByte()) == -1) if (typeof (b = bytes[bytesPos++]) == "undefined")
error("Bad block header in flate stream"); error("Bad block header in flate stream");
var blockLen = b; var blockLen = b;
if ((b = stream.getByte()) == -1) if (typeof (b = bytes[bytesPos++]) == "undefined")
error("Bad block header in flate stream"); error("Bad block header in flate stream");
blockLen |= (b << 8); blockLen |= (b << 8);
if ((b = stream.getByte()) == -1) if (typeof (b = bytes[bytesPos++]) == "undefined")
error("Bad block header in flate stream"); error("Bad block header in flate stream");
var check = b; var check = b;
if ((b = stream.getByte()) == -1) if (typeof (b = bytes[bytesPos++]) == "undefined")
error("Bad block header in flate stream"); error("Bad block header in flate stream");
check |= (b << 8); check |= (b << 8);
if (check != (~this.blockLen & 0xffff)) if (check != (~this.blockLen & 0xffff))
@ -425,7 +442,7 @@ var FlateStream = (function() {
var buffer = this.ensureBuffer(bufferLength + blockLen); var buffer = this.ensureBuffer(bufferLength + blockLen);
this.bufferLength = bufferLength + blockLen; this.bufferLength = bufferLength + blockLen;
for (var n = bufferLength; n < blockLen; ++n) { for (var n = bufferLength; n < blockLen; ++n) {
if ((b = stream.getByte()) == -1) { if (typeof (b = bytes[bytesPos++]) == "undefined") {
this.eof = true; this.eof = true;
break; break;
} }
@ -509,9 +526,32 @@ var FlateStream = (function() {
return constructor; 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;
}
};
return constructor;
})();
var PredictorStream = (function() { var PredictorStream = (function() {
function constructor(stream, params) { function constructor(stream, params) {
this.stream = stream; this.stream = stream;
this.dict = stream.dict;
this.predictor = params.get("Predictor") || 1; this.predictor = params.get("Predictor") || 1;
if (this.predictor <= 1) { if (this.predictor <= 1) {
return stream; // no prediction return stream; // no prediction
@ -1177,15 +1217,15 @@ var Parser = (function() {
this.encAlgorithm, this.encAlgorithm,
this.keyLength); this.keyLength);
} }
stream = this.filter(stream, dict); stream = this.filter(stream, dict, length);
stream.parameters = dict; stream.parameters = dict;
return stream; return stream;
}, },
filter: function(stream, dict) { filter: function(stream, dict, length) {
var filter = dict.get2("Filter", "F"); var filter = dict.get2("Filter", "F");
var params = dict.get2("DecodeParms", "DP"); var params = dict.get2("DecodeParms", "DP");
if (IsName(filter)) if (IsName(filter))
return this.makeFilter(stream, filter.name, params); return this.makeFilter(stream, filter.name, length, params);
if (IsArray(filter)) { if (IsArray(filter)) {
var filterArray = filter; var filterArray = filter;
var paramsArray = params; var paramsArray = params;
@ -1196,18 +1236,21 @@ var Parser = (function() {
params = null; params = null;
if (IsArray(paramsArray) && (i in paramsArray)) if (IsArray(paramsArray) && (i in paramsArray))
params = paramsArray[i]; params = paramsArray[i];
stream = this.makeFilter(stream, filter.name, params); stream = this.makeFilter(stream, filter.name, length, params);
} }
} }
} }
return stream; return stream;
}, },
makeFilter: function(stream, name, params) { makeFilter: function(stream, name, length, params) {
if (name == "FlateDecode" || name == "Fl") { if (name == "FlateDecode" || name == "Fl") {
if (params) { if (params) {
return new PredictorStream(new FlateStream(stream), params); return new PredictorStream(new FlateStream(stream), params);
} }
return new FlateStream(stream); return new FlateStream(stream);
} else if (name == "DCTDecode") {
var bytes = stream.getBytes(length);
return new JpegStream(bytes, stream.dict);
} else { } else {
error("filter '" + name + "' not supported yet"); error("filter '" + name + "' not supported yet");
} }
@ -2475,12 +2518,19 @@ var CanvasGraphics = (function() {
var fontName = ""; var fontName = "";
var fontDescriptor = font.get("FontDescriptor"); var fontDescriptor = font.get("FontDescriptor");
if (fontDescriptor.num) { if (fontDescriptor && fontDescriptor.num) {
var fontDescriptor = this.xref.fetchIfRef(fontDescriptor); var fontDescriptor = this.xref.fetchIfRef(fontDescriptor);
fontName = fontDescriptor.get("FontName").name.replace("+", "_"); fontName = fontDescriptor.get("FontName").name.replace("+", "_");
Fonts.active = fontName; 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.current.fontSize = size;
this.ctx.font = this.current.fontSize +'px "' + fontName + '", Symbol'; this.ctx.font = this.current.fontSize +'px "' + fontName + '", Symbol';
}, },
@ -2508,9 +2558,9 @@ var CanvasGraphics = (function() {
}, },
showText: function(text) { showText: function(text) {
this.ctx.save(); 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.transform.apply(this.ctx, this.current.textMatrix);
this.ctx.scale(1, -1);
this.ctx.translate(0, -2 * this.current.y);
this.ctx.fillText(Fonts.chars2Unicode(text), 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.current.x += this.ctx.measureText(text).width;
@ -2882,10 +2932,21 @@ var CanvasGraphics = (function() {
if (w < 1 || h < 1) if (w < 1 || h < 1)
error("Invalid image width or height"); error("Invalid image width or height");
var ctx = this.ctx; var ctx = this.ctx;
// scale the image to the unit square // scale the image to the unit square
ctx.scale(1/w, 1/h); 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"); var interpolate = dict.get2("Interpolate", "I");
if (!IsBool(interpolate)) if (!IsBool(interpolate))
@ -2991,7 +3052,7 @@ var CanvasGraphics = (function() {
switch (numComps) { switch (numComps) {
case 1: case 1:
for (var i = 0; i < length; i += 4) { for (var i = 0; i < length; i += 4) {
var p = imgArray[imageIdx++]; var p = imgArray[imgIdx++];
pixels[i] = p; pixels[i] = p;
pixels[i+1] = p; pixels[i+1] = p;
pixels[i+2] = p; pixels[i+2] = p;
@ -3018,7 +3079,7 @@ var CanvasGraphics = (function() {
switch (numComps) { switch (numComps) {
case 1: case 1:
for (var i = 0; i < length; i += 4) { for (var i = 0; i < length; i += 4) {
var p = imgArray[imageIdx++]; var p = imgArray[imgIdx++];
pixels[i] = p; pixels[i] = p;
pixels[i+1] = p; pixels[i+1] = p;
pixels[i+2] = p; pixels[i+2] = p;
@ -3038,7 +3099,7 @@ var CanvasGraphics = (function() {
} }
} }
tmpCtx.putImageData(imgData, 0, 0); tmpCtx.putImageData(imgData, 0, 0);
ctx.drawImage(tmpCanvas, 0, 0); ctx.drawImage(tmpCanvas, 0, -h);
this.restore(); this.restore();
}, },