Sakurai/pdf.js
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Improve the extractInfo code to be more robust

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This commit is contained in:
Vivien Nicolas 2011-07-01 05:16:27 +02:00
parent 697aa0f15e
commit ae2d130f40
1 changed files with 35 additions and 43 deletions
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78
fonts.js
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@ -1333,14 +1333,19 @@ var Type1Parser = function() {
* extracted from and eexec encrypted block of data
*/
this.extractFontProgram = function t1_extractFontProgram(stream) {
var eexecString = decrypt(stream, kEexecEncryptionKey, 4);
var subrs = [], glyphs = [];
var inGlyphs = false;
var inSubrs = false;
var glyph = "";
var eexec = decrypt(stream, kEexecEncryptionKey, 4);
var eexecString = "";
for (var i = 0; i < eexec.length; i++)
eexecString += String.fromCharCode(eexec[i]);
var glyphsSection = false, subrsSection = false;
var extracted = {
subrs: [],
charstrings: []
};
var glyph = "";
var token = "";
var index = 0;
var length = 0;
var c = "";
@ -1348,52 +1353,39 @@ var Type1Parser = function() {
for (var i = 0; i < count; i++) {
var c = eexecString[i];
if (inSubrs && c == 0x52) {
length = parseInt(length);
var data = eexecString.slice(i + 3, i + 3 + length);
var encodedSubr = decrypt(data, kCharStringsEncryptionKey, 4);
var str = decodeCharString(encodedSubr);
if ((glyphsSection || subrsSection) && c == "R") {
var data = eexec.slice(i + 3, i + 3 + length);
var encoded = decrypt(data, kCharStringsEncryptionKey, 4);
var str = decodeCharString(encoded);
subrs.push(str.charstring);
i += 3 + length;
} else if (inGlyphs && c == 0x52) {
length = parseInt(length);
var data = eexecString.slice(i + 3, i + 3 + length);
var encodedCharstring = decrypt(data, kCharStringsEncryptionKey, 4);
var str = decodeCharString(encodedCharstring);
glyphs.push({
if (glyphsSection) {
extracted.charstrings.push({
glyph: glyph,
data: str.charstring,
lsb: str.lsb,
width: str.width
});
i += 3 + length;
} else if (inGlyphs && c == 0x2F) {
});
} else {
extracted.subrs.push(str.charstring);
}
i += length + 3;
} else if (c == " ") {
length = parseInt(token);
token = "";
glyph = "";
while ((c = eexecString[++i]) != 0x20)
glyph += String.fromCharCode(c);
} else if (!inSubrs && !inGlyphs && c == 0x2F && eexecString[i+1] == 0x53) {
while ((c = eexecString[++i]) != 0x20) {};
inSubrs = true;
} else if (c == 0x20) {
index = length;
length = token;
token = "";
} else if (c == 0x2F && eexecString[i+1] == 0x43 && eexecString[i+2] == 0x68) {
while ((c = eexecString[++i]) != 0x20) {};
inSubrs = false;
inGlyphs = true;
} else {
token += String.fromCharCode(c);
token += c;
if (!glyphsSection) {
glyphsSection = token.indexOf("/CharString") != -1;
subrsSection = subrsSection || token.indexOf("Subrs") != -1;
} else if (c == "/") {
token = glyph = "";
while ((c = eexecString[++i]) != " ")
glyph += c;
}
}
}
return {
subrs: subrs,
charstrings: glyphs
}
return extracted;
}
};