Sakurai/pdf.js
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avoid constantly calling ensureBuffer

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This commit is contained in:
Andreas Gal 2011-06-21 18:31:07 -04:00
parent 51b9659f55
commit 00e2ff5a60
1 changed files with 28 additions and 20 deletions
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48
pdf.js
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@ -314,7 +314,7 @@ var FlateStream = (function() {
}, },
ensureBuffer: function(requested) { ensureBuffer: function(requested) {
var buffer = this.buffer; var buffer = this.buffer;
var current = buffer ? buffer.byteLength : 0; var current = buffer ? buffer.length : 0;
if (requested < current) if (requested < current)
return buffer; return buffer;
var size = 512; var size = 512;
@ -494,32 +494,40 @@ var FlateStream = (function() {
} }
var pos = this.bufferLength; var pos = this.bufferLength;
var buffer = this.buffer;
var limit = buffer ? buffer.length : 0;
while (true) { while (true) {
var code1 = this.getCode(litCodeTable); var code1 = this.getCode(litCodeTable);
if (code1 < 256) {
if (pos + 1 >= limit) {
buffer = this.ensureBuffer(pos + 1);
limit = buffer.length;
}
buffer[pos++] = code1;
continue;
}
if (code1 == 256) { if (code1 == 256) {
this.bufferLength = pos; this.bufferLength = pos;
return; return;
} }
if (code1 < 256) { code1 -= 257;
var buffer = this.ensureBuffer(pos + 1); code1 = lengthDecode[code1];
buffer[pos++] = code1; var code2 = code1 >> 16;
} else { if (code2 > 0)
code1 -= 257; code2 = this.getBits(code2);
code1 = lengthDecode[code1]; var len = (code1 & 0xffff) + code2;
var code2 = code1 >> 16; code1 = this.getCode(distCodeTable);
if (code2 > 0) code1 = distDecode[code1];
code2 = this.getBits(code2); code2 = code1 >> 16;
var len = (code1 & 0xffff) + code2; if (code2 > 0)
code1 = this.getCode(distCodeTable); code2 = this.getBits(code2);
code1 = distDecode[code1]; var dist = (code1 & 0xffff) + code2;
code2 = code1 >> 16; if (pos + len >= limit) {
if (code2 > 0) buffer = this.ensureBuffer(pos + len);
code2 = this.getBits(code2); limit = buffer.length;
var dist = (code1 & 0xffff) + code2;
var buffer = this.ensureBuffer(pos + len);
for (var k = 0; k < len; ++k, ++pos)
buffer[pos] = buffer[pos - dist];
} }
for (var k = 0; k < len; ++k, ++pos)
buffer[pos] = buffer[pos - dist];
} }
} }
}; };