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Merge pull request #220 from saebekassebil/master

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ASCIIHexDecode Filter implementation
This commit is contained in:
sbarman 2011-07-08 15:41:25 -07:00
commit c16f594465
2 changed files with 126 additions and 1 deletions
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72
pdf.js
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@ -904,6 +904,74 @@ var Ascii85Stream = (function() {
return constructor;
})();
var AsciiHexStream = (function() {
function constructor(str) {
this.str = str;
this.dict = str.dict;
DecodeStream.call(this);
}
var hexvalueMap = {
9: -1, // \t
32: -1, // space
48: 0,
49: 1,
50: 2,
51: 3,
52: 4,
53: 5,
54: 6,
55: 7,
56: 8,
57: 9,
65: 10,
66: 11,
67: 12,
68: 13,
69: 14,
70: 15,
97: 10,
98: 11,
99: 12,
100: 13,
101: 14,
102: 15
};
constructor.prototype = Object.create(DecodeStream.prototype);
constructor.prototype.readBlock = function() {
var gtCode = '>'.charCodeAt(0), bytes = this.str.getBytes(), c, n,
decodeLength, buffer, bufferLength, i, length;
decodeLength = (bytes.length + 1) >> 1;
buffer = this.ensureBuffer(this.bufferLength + decodeLength);
bufferLength = this.bufferLength;
for(i = 0, length = bytes.length; i < length; i++) {
c = hexvalueMap[bytes[i]];
while (c == -1 && (i+1) < length) {
c = hexvalueMap[bytes[++i]];
}
if((i+1) < length && (bytes[i+1] !== gtCode)) {
n = hexvalueMap[bytes[++i]];
buffer[bufferLength++] = c*16+n;
} else {
if(bytes[i] !== gtCode) { // EOD marker at an odd number, behave as if a 0 followed the last digit.
buffer[bufferLength++] = c*16;
}
}
}
this.bufferLength = bufferLength;
this.eof = true;
};
return constructor;
})();
var CCITTFaxStream = (function() {
var ccittEOL = -2;
@ -1943,7 +2011,7 @@ var Dict = (function() {
forEach: function(callback) {
for (var key in this.map) {
callback.call(null, key, this.map[key]);
callback(key, this.map[key]);
}
}
};
@ -2496,6 +2564,8 @@ var Parser = (function() {
return new JpegStream(bytes, stream.dict);
} else if (name == 'ASCII85Decode') {
return new Ascii85Stream(stream);
} else if (name == 'ASCIIHexDecode') {
return new AsciiHexStream(stream);
} else if (name == 'CCITTFaxDecode') {
TODO('implement fax stream');
return new CCITTFaxStream(stream, params);

55
test/pdfs/asciihexdecode.pdf Normal file
View File

@ -0,0 +1,55 @@
%PDF-1.0
1 0 obj
<<
/Pages 2 0 R
/Type /Catalog
>>
endobj
2 0 obj
<<
/Count 1
/Kids [ 3 0 R ]
/Type /Pages
>>
endobj
3 0 obj
<<
/MediaBox [ 0 0 795 842 ]
/Parent 2 0 R
/Contents 4 0 R
/Resources <<
/Font <<
/F1 <<
/Name /F1
/BaseFont /Helvetica
/Subtype /Type1
/Type /Font
>>
>>
>>
/Type /Page
>>
endobj
4 0 obj
<<
/Filter /ASCIIHexDecode
/Length 111
>>stream
42540A2F46312033302054660A333530203735302054640A323020544C0A312054720A2848656C6C6F20776F726C642920546A0A45540A>
endstream
endobj
xref
0 5
0000000000 65535 f
0000000010 00000 n
0000000067 00000 n
0000000136 00000 n
0000000373 00000 n
trailer
<<
/Root 1 0 R
/Size 5
>>
startxref
568
%%EOF