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Move the Type2 utils to a new file and create a Stack object

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This commit is contained in:
Vivien Nicolas 2011-06-10 02:07:41 +02:00
parent 74abf984d5
commit 3834c9be08
2 changed files with 457 additions and 525 deletions
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630
PDFFont.js
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@ -11,6 +11,47 @@ var Fonts = new Dict();
var _Fonts = {};
var Stack = function() {
var innerStack = [];
this.push = function(aOperand) {
innerStack.push(aOperand);
};
this.pop = function() {
if (!this.count())
throw new Error("stackunderflow");
return innerStack.pop();
};
this.peek = function() {
if (!this.count())
return null;
return innerStack[innerStack.length - 1];
};
this.get = function(aIndex) {
return innerStack[aIndex];
};
this.clear = function() {
innerStack = [];
};
this.count = function() {
return innerStack.length;
};
this.dump = function() {
for (var i = 0; i < this.length; i++)
log(innerStack[i]);
};
this.clone = function() {
return innerStack.slice();
};
};
var Base64Encoder = {
encode: function(aData) {
var str = [];
@ -36,20 +77,8 @@ var TrueTypeFont = function(aFontName, aFontFile) {
document.styleSheets[0].insertRule("@font-face { font-family: '" + aFontName + "'; src: " + url + " }", 0);
};
var Type1Parser = function(aAsciiStream, aBinaryStream) {
if (IsStream(aAsciiStream)) {
var lexer = new Lexer(aAsciiStream);
} else {
var lexer = {
__data__: aAsciiStream.slice(),
getObj: function() {
return this.__data__.shift();
}
}
}
var lexer = aAsciiStream ? new Lexer(aAsciiStream) : null;
// Turn on this flag for additional debugging logs
var debug = false;
@ -225,41 +254,7 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
* operator returns one or more results, it does so by pushing them on the
* operand stack.
*/
var operandStack = {
__innerStack__: [],
push: function(aOperand) {
this.__innerStack__.push(aOperand);
},
pop: function() {
if (!this.length)
throw new Error("stackunderflow");
return this.__innerStack__.pop();
},
peek: function() {
if (!this.length)
return null;
return this.__innerStack__[this.__innerStack__.length - 1];
},
get: function(aIndex) {
return this.__innerStack__[aIndex];
},
dump: function() {
log("=== Start Dumping operandStack ===");
var str = [];
for (var i = 0; i < this.length; i++)
log(this.__innerStack__[i]);
log("=== End Dumping operandStack ===");
},
get length() {
return this.__innerStack__.length;
}
};
var operandStack = new Stack();
// Flag indicating if the topmost operand of the operandStack is an array
var operandIsArray = 0;
@ -277,42 +272,10 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
globalDict = new Dict(),
userDict = new Dict();
var dictionaryStack = {
__innerStack__: [systemDict, globalDict, userDict],
push: function(aDictionary) {
this.__innerStack__.push(aDictionary);
},
pop: function() {
if (this.__innerStack__.length == 3)
return null;
return this.__innerStack__.pop();
},
peek: function() {
if (!this.length)
return null;
return this.__innerStack__[this.__innerStack__.length - 1];
},
get: function(aIndex) {
return this.__innerStack__[aIndex];
},
get length() {
return this.__innerStack__.length;
},
dump: function() {
log("=== Start Dumping dictionaryStack ===");
var str = [];
for (var i = 0; i < this.length; i++)
log(this.__innerStack__[i]);
log("=== End Dumping dictionaryStack ===");
},
};
var dictionaryStack = new Stack();
dictionaryStack.push(systemDict);
dictionaryStack.push(globalDict);
dictionaryStack.push(userDict);
/*
* The execution stack holds executable objects (mainly procedures and files)
@ -324,31 +287,7 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
* object off the execution stack and resumes executing the suspended object
* beneath it.
*/
var executionStack = {
__innerStack__: [],
push: function(aProcedure) {
this.__innerStack__.push(aProcedure);
},
pop: function() {
return this.__innerStack__.pop();
},
peek: function() {
if (!this.length)
return null;
return this.__innerStack__[this.__innerStack__.length - 1];
},
get: function(aIndex) {
return this.__innerStack__[aIndex];
},
get length() {
return this.__innerStack__.length;
}
};
var executionStack = new Stack();
/*
* Return the next token in the execution stack
@ -637,7 +576,7 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
default:
var command = null;
if (IsCmd(obj)) {
for (var i = 0; i < dictionaryStack.length; i++) {
for (var i = 0; i < dictionaryStack.count(); i++) {
if (command = dictionaryStack.get(i).get(obj.cmd)) {
dump("found in dictionnary for " + obj.cmd + " command: " + command);
executionStack.push(command.slice());
@ -760,7 +699,11 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
* as descrived in 'Using Subroutines' of 'Adobe Type 1 Font Format',
* chapter 8.
*/
this.flattenCharstring = function(aCharString, aDefaultWidth, aNominalWidth, aSubrs) {
this.flattenCharstring = function(aCharstring, aDefaultWidth, aNominalWidth, aSubrs) {
operandStack.clear();
executionStack.clear();
executionStack.push(aCharstring);
var leftSidebearing = 0;
var lastPoint = 0;
while (true) {
@ -791,7 +734,7 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
break;
case "vstem":
log(obj + " is not converted (yet?)");
//log(obj + " is not converted (yet?)");
operandStack.push("vstem");
break;
@ -841,20 +784,24 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
break;
case "callothersubr":
log("callothersubr");
// XXX need to be improved
var index = operandStack.pop();
var count = operandStack.pop();
var data = operandStack.pop();
if (index != 3)
log("callothersubr for index: " + index);
operandStack.push(3);
operandStack.push("callothersubr");
break;
case "endchar":
operandStack.push("endchar");
return operandStack.__innerStack__.slice();
return operandStack.clone();
case "pop":
operandStack.pop();
break;
default:
operandStack.push(obj);
break;
@ -885,41 +832,31 @@ var Type1Font = function(aFontName, aFontFile) {
this.parser = new Type1Parser(ASCIIStream, binaryStream);
var fontName = this.parser.parse();
this.convertToOTF(fontName);
var end = Date.now();
log("Time to parse font is:" + (end - start));
}
};
Type1Font.prototype = {
convertToOTF: function(aFontName) {
var font = Fonts.get(aFontName);
var private = font.get("Private");
var subrs = private.get("Subrs");
var otherSubrs = private.get("OtherSubrs");
var charstrings = font.get("CharStrings")
// Try to get the most used glyph width
var widths = {};
for (var glyph in charstrings.map) {
var glyphData = charstrings.get(glyph);
var glyphWidth = glyphData[1];
if (widths[glyphWidth])
widths[glyphWidth]++;
else
widths[glyphWidth] = 1;
}
getDefaultWidths: function(aCharstrings) {
var defaultWidth = 0;
var used = 0;
for (var width in widths) {
if (widths[width] > used) {
defaultWidth = width;
used = widths[width];
}
}
log("defaultWidth to used: " + defaultWidth);
var defaultUsedCount = 0;
var maxNegDistance = 0;
var maxPosDistance = 0;
var widths = {};
for (var glyph in aCharstrings.map) {
var width = aCharstrings.get(glyph)[1];
var usedCount = (widths[width] || 0) + 1;
if (usedCount > defaultUsedCount) {
defaultUsedCount = usedCount;
defaultWidth = width;
}
widths[width] = usedCount;
}
defaultWidth = parseInt(defaultWidth);
var maxNegDistance = 0, maxPosDistance = 0;
for (var width in widths) {
var diff = width - defaultWidth;
if (diff < 0 && diff < maxNegDistance) {
@ -929,394 +866,37 @@ Type1Font.prototype = {
}
}
var nominalWidth = parseInt(defaultWidth) + (parseInt(maxPosDistance) + parseInt(maxNegDistance)) / 2;
return {
default: defaultWidth,
nominal: defaultWidth + (maxPosDistance + maxNegDistance) / 2
};
},
convertToOTF: function(aFontName) {
var font = Fonts.get(aFontName);
var charstrings = font.get("CharStrings")
var defaultWidths = this.getDefaultWidths(charstrings);
var defaultWidth = defaultWidths.default;
var nominalWidth = defaultWidths.nominal;
log("defaultWidth to used: " + defaultWidth);
log("nominalWidth to used: " + nominalWidth);
log("Hack nonimal:" + (nominalWidth = 615));
var glyphs = {};
var subrs = font.get("Private").get("Subrs");
var parser = new Type1Parser();
for (var glyph in charstrings.map) {
if (glyph == ".notdef")
continue;
var charstring = charstrings.get(glyph);
glyphs[glyph] = parser.flattenCharstring(charstring, defaultWidth, nominalWidth, subrs);
var glyphData = charstrings.get(glyph);
var parser = new Type1Parser(glyphData);
log("=================================== " + glyph + " ==============================");
log(charstrings.get(glyph));
log(parser.flattenCharstring("A", defaultWidth, nominalWidth, subrs));
log(validationData[glyph]);
//log("=================================== " + glyph + " ==============================");
//log(charstrings.get(glyph));
//log(flattenedCharstring);
//log(validationData[glyph]);
}
/*
log(charStrings.get("A"));
log(newCharStrings.get("A"));
log(validationData["A"]);
*/
var end = Date.now();
//log("Time to parse font is:" + (end - start));
}
};
/**
* The Type2 reader code below is only used for debugging purpose since Type2
* is only a CharString format and is never used directly as a Font file.
*
* So the code here is useful for dumping the data content of a .cff file in
* order to investigate the similarity between a Type1 CharString and a Type2
* CharString.
*/
/**
* Build a charset by assigning the glyph name and the human readable form
* of the glyph data.
*/
function readCharset(aStream, aCharstrings) {
var charset = {};
var format = aStream.getByte();
if (format == 0) {
charset[".notdef"] = readCharstringEncoding(aCharstrings[0]);
var count = aCharstrings.length - 1;
for (var i = 1; i < count + 1; i++) {
var sid = aStream.getByte() << 8 | aStream.getByte();
charset[CFFStrings[sid]] = readCharstringEncoding(aCharstrings[i]);
log(CFFStrings[sid] + "::" + charset[CFFStrings[sid]]);
}
} else if (format == 1) {
error("Charset Range are not supported");
} else {
error("Invalid charset format");
}
return charset;
};
/**
* Take a Type2 binary charstring as input and transform it to a human
* readable representation as specified by the 'The Type 2 Charstring Format',
* chapter 3.1.
*/
function readCharstringEncoding(aString) {
var charstringTokens = [];
var count = aString.length;
for (var i = 0; i < count; ) {
var value = aString[i++];
var token = null;
if (value < 0) {
continue;
} else if (value <= 11) {
token = CFFEncodingMap[value];
} else if (value == 12) {
token = CFFEncodingMap[value][aString[i++]];
} else if (value <= 18) {
token = CFFEncodingMap[value];
} else if (value <= 20) {
var mask = aString[i++];
token = CFFEncodingMap[value];
} else if (value <= 27) {
token = CFFEncodingMap[value];
} else if (value == 28) {
token = aString[i++] << 8 | aString[i++];
} else if (value <= 31) {
token = CFFEncodingMap[value];
} else if (value < 247) {
token = parseInt(value) - 139;
} else if (value < 251) {
token = ((value - 247) * 256) + aString[i++] + 108;
} else if (value < 255) {
token = -((value - 251) * 256) - aString[i++] - 108;
} else {// value == 255
token = aString[i++] << 24 | aString[i++] << 16 |
aString[i++] << 8 | aString[i];
}
charstringTokens.push(token);
}
return charstringTokens;
};
/**
* Take a binary DICT Data as input and transform it into a human readable
* form as specified by 'The Compact Font Format Specification', chapter 5.
*/
function readFontDictData(aString, aMap) {
var fontDictDataTokens = [];
var count = aString.length;
for (var i = 0; i < count; i) {
var value = aString[i++];
var token = null;
if (value == 12) {
token = aMap[value][aString[i++]];
} else if (value == 28) {
token = aString[i++] << 8 | aString[i++];
} else if (value == 29) {
token = aString[i++] << 24 |
aString[i++] << 16 |
aString[i++] << 8 |
aString[i++];
} else if (value == 30) {
token = "";
var parsed = false;
while (!parsed) {
var byte = aString[i++];
var nibbles = [parseInt(byte / 16), parseInt(byte % 16)];
for (var j = 0; j < nibbles.length; j++) {
var nibble = nibbles[j];
switch (nibble) {
case 0xA:
token += ".";
break;
case 0xB:
token += "E";
break;
case 0xC:
token += "E-";
break;
case 0xD:
break;
case 0xE:
token += "-";
break;
case 0xF:
parsed = true;
break;
default:
token += nibble;
break;
}
}
};
token = parseFloat(token);
} else if (value <= 31) {
token = aMap[value];
} else if (value <= 246) {
token = parseInt(value) - 139;
} else if (value <= 250) {
token = ((value - 247) * 256) + aString[i++] + 108;
} else if (value <= 254) {
token = -((value - 251) * 256) - aString[i++] - 108;
} else if (value == 255) {
error("255 is not a valid DICT command");
}
fontDictDataTokens.push(token);
}
return fontDictDataTokens;
};
/**
* Take a stream as input and return an array of objects.
* In CFF an INDEX is a structure with the following format:
* {
* count: 2 bytes (Number of objects stored in INDEX),
* offsize: 1 byte (Offset array element size),
* offset: [count + 1] bytes (Offsets array),
* data: - (Objects data)
* }
*
* More explanation are given in the 'CFF Font Format Specification',
* chapter 5.
*/
function readFontIndexData(aStream, aIsByte) {
var count = aStream.getByte() << 8 | aStream.getByte();
var offsize = aStream.getByte();
function getNextOffset() {
switch (offsize) {
case 0:
return 0;
case 1:
return aStream.getByte();
case 2:
return aStream.getByte() << 8 | aStream.getByte();
case 3:
return aStream.getByte() << 16 | aStream.getByte() << 8 |
aStream.getByte();
case 4:
return aStream.getByte() << 24 | aStream.getByte() << 16 |
aStream.getByte() << 8 | aStream.getByte();
}
};
var offsets = [];
for (var i = 0; i < count + 1; i++)
offsets.push(getNextOffset());
log("Found " + count + " objects at offsets :" + offsets + " (offsize: " + offsize + ")");
// Now extract the objects
var relativeOffset = aStream.pos;
var objects = [];
for (var i = 0; i < count; i++) {
var offset = offsets[i];
aStream.pos = relativeOffset + offset - 1;
var data = [];
var length = offsets[i + 1] - 1;
for (var j = offset - 1; j < length; j++)
data.push(aIsByte ? aStream.getByte() : aStream.getChar());
objects.push(data);
}
return objects;
};
var Type2Parser = function(aFilePath) {
var font = new Dict();
// Turn on this flag for additional debugging logs
var debug = true;
function dump(aStr) {
if (debug)
log(aStr);
};
function parseAsToken(aString, aMap) {
var decoded = readFontDictData(aString, aMap);
log(decoded);
var stack = [];
var count = decoded.length;
for (var i = 0; i < count; i++) {
var token = decoded[i];
if (IsNum(token)) {
stack.push(token);
} else {
switch (token.operand) {
case "SID":
font.set(token.name, CFFStrings[stack.pop()]);
break;
case "number number":
font.set(token.name, {
offset: stack.pop(),
size: stack.pop()
});
break;
case "boolean":
font.set(token.name, stack.pop());
break;
case "delta":
font.set(token.name, stack.pop());
break;
default:
if (token.operand && token.operand.length) {
var array = [];
for (var j = 0; j < token.operand.length; j++)
array.push(stack.pop());
font.set(token.name, array);
} else {
font.set(token.name, stack.pop());
}
break;
}
}
}
};
this.parse = function(aStream) {
font.set("major", aStream.getByte());
font.set("minor", aStream.getByte());
font.set("hdrSize", aStream.getByte());
font.set("offsize", aStream.getByte());
// Move the cursor after the header
aStream.skip(font.get("hdrSize") - aStream.pos);
// Read the NAME Index
dump("Reading Index: Names");
font.set("Names", readFontIndexData(aStream));
// Read the Top Dict Index
dump("Reading Index: TopDict");
var topDict = readFontIndexData(aStream, true);
// Read the String Index
dump("Reading Index: Strings");
var strings = readFontIndexData(aStream);
// Fill up the Strings dictionary with the new unique strings
for (var i = 0; i < strings.length; i++)
CFFStrings.push(strings[i].join(""));
// Parse the TopDict operator
var objects = [];
var count = topDict.length;
for (var i = 0; i < count; i++)
parseAsToken(topDict[i], CFFDictDataMap);
// Read the Global Subr Index that comes just after the Strings Index
// (cf. "The Compact Font Format Specification" Chapter 16)
dump("Reading Global Subr Index");
var subrs = readFontIndexData(aStream);
// Reading Private Dict
var private = font.get("Private");
log("Reading Private Dict (offset: " + private.offset + " size: " + private.size + ")");
aStream.pos = private.offset;
var privateDict = [];
for (var i = 0; i < private.size; i++)
privateDict.push(aStream.getByte());
parseAsToken(privateDict, CFFDictPrivateDataMap);
for (var p in font.map)
dump(p + "::" + font.get(p));
// Read CharStrings Index
var charStringsOffset = font.get("CharStrings");
dump("Read CharStrings Index (offset: " + charStringsOffset + ")");
aStream.pos = charStringsOffset;
var charStrings = readFontIndexData(aStream, true);
var charsetEntry = font.get("charset");
if (charsetEntry == 0) {
throw new Error("Need to support CFFISOAdobeCharset");
} else if (charsetEntry == 1) {
throw new Error("Need to support CFFExpert");
} else if (charsetEntry == 2) {
throw new Error("Need to support CFFExpertSubsetCharset");
} else {
aStream.pos = charsetEntry;
var charset = readCharset(aStream, charStrings);
}
}
};
// XXX
/*
var xhr = new XMLHttpRequest();
xhr.open("GET", "titi.cff", false);
xhr.mozResponseType = xhr.responseType = "arraybuffer";
xhr.expected = (document.URL.indexOf("file:") == 0) ? 0 : 200;
xhr.send(null);
var cffData = xhr.mozResponseArrayBuffer || xhr.mozResponse ||
xhr.responseArrayBuffer || xhr.response;
var cff = new Type2Parser("titi.cff");
cff.parse(new Stream(cffData));
*/

352
PDFFontUtils.js Normal file
View File

@ -0,0 +1,352 @@
/**
* The Type2 reader code below is only used for debugging purpose since Type2
* is only a CharString format and is never used directly as a Font file.
*
* So the code here is useful for dumping the data content of a .cff file in
* order to investigate the similarity between a Type1 CharString and a Type2
* CharString.
*/
/**
* Build a charset by assigning the glyph name and the human readable form
* of the glyph data.
*/
function readCharset(aStream, aCharstrings) {
var charset = {};
var format = aStream.getByte();
if (format == 0) {
charset[".notdef"] = readCharstringEncoding(aCharstrings[0]);
var count = aCharstrings.length - 1;
for (var i = 1; i < count + 1; i++) {
var sid = aStream.getByte() << 8 | aStream.getByte();
charset[CFFStrings[sid]] = readCharstringEncoding(aCharstrings[i]);
log(CFFStrings[sid] + "::" + charset[CFFStrings[sid]]);
}
} else if (format == 1) {
error("Charset Range are not supported");
} else {
error("Invalid charset format");
}
return charset;
};
/**
* Take a Type2 binary charstring as input and transform it to a human
* readable representation as specified by the 'The Type 2 Charstring Format',
* chapter 3.1.
*/
function readCharstringEncoding(aString) {
var charstringTokens = [];
var count = aString.length;
for (var i = 0; i < count; ) {
var value = aString[i++];
var token = null;
if (value < 0) {
continue;
} else if (value <= 11) {
token = CFFEncodingMap[value];
} else if (value == 12) {
token = CFFEncodingMap[value][aString[i++]];
} else if (value <= 18) {
token = CFFEncodingMap[value];
} else if (value <= 20) {
var mask = aString[i++];
token = CFFEncodingMap[value];
} else if (value <= 27) {
token = CFFEncodingMap[value];
} else if (value == 28) {
token = aString[i++] << 8 | aString[i++];
} else if (value <= 31) {
token = CFFEncodingMap[value];
} else if (value < 247) {
token = parseInt(value) - 139;
} else if (value < 251) {
token = ((value - 247) * 256) + aString[i++] + 108;
} else if (value < 255) {
token = -((value - 251) * 256) - aString[i++] - 108;
} else {// value == 255
token = aString[i++] << 24 | aString[i++] << 16 |
aString[i++] << 8 | aString[i];
}
charstringTokens.push(token);
}
return charstringTokens;
};
/**
* Take a binary DICT Data as input and transform it into a human readable
* form as specified by 'The Compact Font Format Specification', chapter 5.
*/
function readFontDictData(aString, aMap) {
var fontDictDataTokens = [];
var count = aString.length;
for (var i = 0; i < count; i) {
var value = aString[i++];
var token = null;
if (value == 12) {
token = aMap[value][aString[i++]];
} else if (value == 28) {
token = aString[i++] << 8 | aString[i++];
} else if (value == 29) {
token = aString[i++] << 24 |
aString[i++] << 16 |
aString[i++] << 8 |
aString[i++];
} else if (value == 30) {
token = "";
var parsed = false;
while (!parsed) {
var byte = aString[i++];
var nibbles = [parseInt(byte / 16), parseInt(byte % 16)];
for (var j = 0; j < nibbles.length; j++) {
var nibble = nibbles[j];
switch (nibble) {
case 0xA:
token += ".";
break;
case 0xB:
token += "E";
break;
case 0xC:
token += "E-";
break;
case 0xD:
break;
case 0xE:
token += "-";
break;
case 0xF:
parsed = true;
break;
default:
token += nibble;
break;
}
}
};
token = parseFloat(token);
} else if (value <= 31) {
token = aMap[value];
} else if (value <= 246) {
token = parseInt(value) - 139;
} else if (value <= 250) {
token = ((value - 247) * 256) + aString[i++] + 108;
} else if (value <= 254) {
token = -((value - 251) * 256) - aString[i++] - 108;
} else if (value == 255) {
error("255 is not a valid DICT command");
}
fontDictDataTokens.push(token);
}
return fontDictDataTokens;
};
/**
* Take a stream as input and return an array of objects.
* In CFF an INDEX is a structure with the following format:
* {
* count: 2 bytes (Number of objects stored in INDEX),
* offsize: 1 byte (Offset array element size),
* offset: [count + 1] bytes (Offsets array),
* data: - (Objects data)
* }
*
* More explanation are given in the 'CFF Font Format Specification',
* chapter 5.
*/
function readFontIndexData(aStream, aIsByte) {
var count = aStream.getByte() << 8 | aStream.getByte();
var offsize = aStream.getByte();
function getNextOffset() {
switch (offsize) {
case 0:
return 0;
case 1:
return aStream.getByte();
case 2:
return aStream.getByte() << 8 | aStream.getByte();
case 3:
return aStream.getByte() << 16 | aStream.getByte() << 8 |
aStream.getByte();
case 4:
return aStream.getByte() << 24 | aStream.getByte() << 16 |
aStream.getByte() << 8 | aStream.getByte();
}
};
var offsets = [];
for (var i = 0; i < count + 1; i++)
offsets.push(getNextOffset());
log("Found " + count + " objects at offsets :" + offsets + " (offsize: " + offsize + ")");
// Now extract the objects
var relativeOffset = aStream.pos;
var objects = [];
for (var i = 0; i < count; i++) {
var offset = offsets[i];
aStream.pos = relativeOffset + offset - 1;
var data = [];
var length = offsets[i + 1] - 1;
for (var j = offset - 1; j < length; j++)
data.push(aIsByte ? aStream.getByte() : aStream.getChar());
objects.push(data);
}
return objects;
};
var Type2Parser = function(aFilePath) {
var font = new Dict();
// Turn on this flag for additional debugging logs
var debug = true;
function dump(aStr) {
if (debug)
log(aStr);
};
function parseAsToken(aString, aMap) {
var decoded = readFontDictData(aString, aMap);
log(decoded);
var stack = [];
var count = decoded.length;
for (var i = 0; i < count; i++) {
var token = decoded[i];
if (IsNum(token)) {
stack.push(token);
} else {
switch (token.operand) {
case "SID":
font.set(token.name, CFFStrings[stack.pop()]);
break;
case "number number":
font.set(token.name, {
offset: stack.pop(),
size: stack.pop()
});
break;
case "boolean":
font.set(token.name, stack.pop());
break;
case "delta":
font.set(token.name, stack.pop());
break;
default:
if (token.operand && token.operand.length) {
var array = [];
for (var j = 0; j < token.operand.length; j++)
array.push(stack.pop());
font.set(token.name, array);
} else {
font.set(token.name, stack.pop());
}
break;
}
}
}
};
this.parse = function(aStream) {
font.set("major", aStream.getByte());
font.set("minor", aStream.getByte());
font.set("hdrSize", aStream.getByte());
font.set("offsize", aStream.getByte());
// Move the cursor after the header
aStream.skip(font.get("hdrSize") - aStream.pos);
// Read the NAME Index
dump("Reading Index: Names");
font.set("Names", readFontIndexData(aStream));
// Read the Top Dict Index
dump("Reading Index: TopDict");
var topDict = readFontIndexData(aStream, true);
// Read the String Index
dump("Reading Index: Strings");
var strings = readFontIndexData(aStream);
// Fill up the Strings dictionary with the new unique strings
for (var i = 0; i < strings.length; i++)
CFFStrings.push(strings[i].join(""));
// Parse the TopDict operator
var objects = [];
var count = topDict.length;
for (var i = 0; i < count; i++)
parseAsToken(topDict[i], CFFDictDataMap);
// Read the Global Subr Index that comes just after the Strings Index
// (cf. "The Compact Font Format Specification" Chapter 16)
dump("Reading Global Subr Index");
var subrs = readFontIndexData(aStream);
// Reading Private Dict
var private = font.get("Private");
log("Reading Private Dict (offset: " + private.offset + " size: " + private.size + ")");
aStream.pos = private.offset;
var privateDict = [];
for (var i = 0; i < private.size; i++)
privateDict.push(aStream.getByte());
parseAsToken(privateDict, CFFDictPrivateDataMap);
for (var p in font.map)
dump(p + "::" + font.get(p));
// Read CharStrings Index
var charStringsOffset = font.get("CharStrings");
dump("Read CharStrings Index (offset: " + charStringsOffset + ")");
aStream.pos = charStringsOffset;
var charStrings = readFontIndexData(aStream, true);
var charsetEntry = font.get("charset");
if (charsetEntry == 0) {
throw new Error("Need to support CFFISOAdobeCharset");
} else if (charsetEntry == 1) {
throw new Error("Need to support CFFExpert");
} else if (charsetEntry == 2) {
throw new Error("Need to support CFFExpertSubsetCharset");
} else {
aStream.pos = charsetEntry;
var charset = readCharset(aStream, charStrings);
}
}
};
// XXX
/*
var xhr = new XMLHttpRequest();
xhr.open("GET", "titi.cff", false);
xhr.mozResponseType = xhr.responseType = "arraybuffer";
xhr.expected = (document.URL.indexOf("file:") == 0) ? 0 : 200;
xhr.send(null);
var cffData = xhr.mozResponseArrayBuffer || xhr.mozResponse ||
xhr.responseArrayBuffer || xhr.response;
var cff = new Type2Parser("titi.cff");
cff.parse(new Stream(cffData));
*/