Sakurai/pdf.js
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turn distDecode into a typed array

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This commit is contained in:
Andreas Gal 2011-06-04 10:27:25 -07:00
parent 9143ad4cf5
commit 4d70cb4aaf
1 changed files with 10 additions and 34 deletions
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44
pdf.js
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@ -124,38 +124,13 @@ var FlateStream = (function() {
0x00102, 0x00102, 0x00102
]);
const distDecode = [
[0, 1],
[0, 2],
[0, 3],
[0, 4],
[1, 5],
[1, 7],
[2, 9],
[2, 13],
[3, 17],
[3, 25],
[4, 33],
[4, 49],
[5, 65],
[5, 97],
[6, 129],
[6, 193],
[7, 257],
[7, 385],
[8, 513],
[8, 769],
[9, 1025],
[9, 1537],
[10, 2049],
[10, 3073],
[11, 4097],
[11, 6145],
[12, 8193],
[12, 12289],
[13, 16385],
[13, 24577]
];
const distDecode = new Uint32Array([
0x00001, 0x00002, 0x00003, 0x00004, 0x10005, 0x10007, 0x20009,
0x2000d, 0x30011, 0x30019, 0x40021, 0x40031, 0x50041, 0x50061,
0x60081, 0x600c1, 0x70101, 0x70181, 0x80201, 0x80301, 0x90401,
0x90601, 0xa0801, 0xa0c01, 0xb1001, 0xb1801, 0xc2001, 0xc3001,
0xd4001, 0xd6001
]);
const fixedLitCodeTab = [[
[7, 0x0100],
@ -944,10 +919,11 @@ var FlateStream = (function() {
code2 = this.getBits(code2);
var len = (code1 & 0xffff) + code2;
code1 = this.getCode(distCodeTable);
code2 = distDecode[code1][0];
code1 = distDecode[code1];
code2 = code1 >> 16;
if (code2 > 0)
code2 = this.getBits(code2);
var dist = distDecode[code1][1] + code2;
var dist = (code1 & 0xffff) + code2;
var buffer = this.ensureBuffer(pos + len);
for (var k = 0; k < len; ++k, ++pos)
buffer[pos] = buffer[pos - dist];