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Recognizes ascii type1 encoding

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Yury Delendik 2014-04-17 07:52:33 -05:00
parent b33f4adf88
commit bf3a2488df
4 changed files with 48 additions and 9 deletions
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50
src/core/fonts.js
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@ -4876,18 +4876,46 @@ var Type1Parser = (function Type1ParserClosure() {
var EEXEC_ENCRYPT_KEY = 55665;
var CHAR_STRS_ENCRYPT_KEY = 4330;
function decrypt(stream, key, discardNumber) {
var r = key, c1 = 52845, c2 = 22719;
var decryptedString = [];
function isHexDigit(code) {
return code >= 48 && code <= 57 || // '0'-'9'
code >= 65 && code <= 70 || // 'A'-'F'
code >= 97 && code <= 102; // 'a'-'f'
}
var value = '';
var count = stream.length;
function decrypt(data, key, discardNumber) {
var r = key | 0, c1 = 52845, c2 = 22719;
var count = data.length;
var decrypted = new Uint8Array(count);
for (var i = 0; i < count; i++) {
value = stream[i];
decryptedString[i] = value ^ (r >> 8);
var value = data[i];
decrypted[i] = value ^ (r >> 8);
r = ((value + r) * c1 + c2) & ((1 << 16) - 1);
}
return decryptedString.slice(discardNumber);
return Array.prototype.slice.call(decrypted, discardNumber);
}
function decryptAscii(data, key, discardNumber) {
var r = key | 0, c1 = 52845, c2 = 22719;
var count = data.length, maybeLength = count >>> 1;
var decrypted = new Uint8Array(maybeLength);
var i, j;
for (i = 0, j = 0; i < count; i++) {
var digit1 = data[i];
if (!isHexDigit(digit1)) {
continue;
}
i++;
var digit2;
while (i < count && !isHexDigit(digit2 = data[i])) {
i++;
}
if (i < count) {
var value = parseInt(String.fromCharCode(digit1, digit2), 16);
decrypted[j++] = value ^ (r >> 8);
r = ((value + r) * c1 + c2) & ((1 << 16) - 1);
}
}
return Array.prototype.slice.call(decrypted, discardNumber, j);
}
function isSpecial(c) {
@ -4899,7 +4927,11 @@ var Type1Parser = (function Type1ParserClosure() {
function Type1Parser(stream, encrypted) {
if (encrypted) {
stream = new Stream(decrypt(stream.getBytes(), EEXEC_ENCRYPT_KEY, 4));
var data = stream.getBytes();
var isBinary = !(isHexDigit(data[0]) && isHexDigit(data[1]) &&
isHexDigit(data[2]) && isHexDigit(data[3]));
stream = new Stream(isBinary ? decrypt(data, EEXEC_ENCRYPT_KEY, 4) :
decryptAscii(data, EEXEC_ENCRYPT_KEY, 4));
}
this.stream = stream;
this.nextChar();