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Attempt to infer if a CMap file actually contains just a standard Identity-H/Identity-V map

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This commit is contained in:
Jonas Jenwald 2015-03-06 15:01:26 +01:00
parent 48b2f6d023
commit 7c7d05e7a3
3 changed files with 60 additions and 5 deletions
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36
src/core/cmap.js
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@ -204,6 +204,7 @@ var CMap = (function CMapClosure() {
// - bf chars are variable-length byte sequences, stored as strings, with
// one byte per character.
this._map = [];
this.name = '';
this.vertical = false;
this.useCMap = null;
this.builtInCMap = builtInCMap;
@ -303,13 +304,28 @@ var CMap = (function CMapClosure() {
}
out.charcode = 0;
out.length = 1;
},
get isIdentityCMap() {
if (!(this.name === 'Identity-H' || this.name === 'Identity-V')) {
return false;
}
if (this._map.length !== 0x10000) {
return false;
}
for (var i = 0; i < 0x10000; i++) {
if (this._map[i] !== i) {
return false;
}
}
return true;
}
};
return CMap;
})();
// A special case of CMap, where the _map array implicitly has a length of
// 65535 and each element is equal to its index.
// 65536 and each element is equal to its index.
var IdentityCMap = (function IdentityCMapClosure() {
function IdentityCMap(vertical, n) {
CMap.call(this);
@ -364,7 +380,11 @@ var IdentityCMap = (function IdentityCMapClosure() {
return map;
},
readCharCode: CMap.prototype.readCharCode
readCharCode: CMap.prototype.readCharCode,
get isIdentityCMap() {
error('should not access .isIdentityCMap');
}
};
return IdentityCMap;
@ -829,6 +849,13 @@ var CMapFactory = (function CMapFactoryClosure() {
}
}
function parseCMapName(cMap, lexer) {
var obj = lexer.getObj();
if (isName(obj) && isString(obj.name)) {
cMap.name = obj.name;
}
}
function parseCMap(cMap, lexer, builtInCMapParams, useCMap) {
var previous;
var embededUseCMap;
@ -839,6 +866,8 @@ var CMapFactory = (function CMapFactoryClosure() {
} else if (isName(obj)) {
if (obj.name === 'WMode') {
parseWMode(cMap, lexer);
} else if (obj.name === 'CMapName') {
parseCMapName(cMap, lexer);
}
previous = obj;
} else if (isCmd(obj)) {
@ -948,6 +977,9 @@ var CMapFactory = (function CMapFactoryClosure() {
} catch (e) {
warn('Invalid CMap data. ' + e);
}
if (cMap.isIdentityCMap) {
return createBuiltInCMap(cMap.name, builtInCMapParams);
}
return cMap;
}
error('Encoding required.');