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fix issue with parsing distance of more then 8 bits; convert to just supporting arrays for buffers

This commit is contained in:
Mike Tinglof 2012-01-26 14:35:36 -05:00
parent a820f1267a
commit 0fa6748c52
1 changed files with 19 additions and 24 deletions
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43
include/jsunzip.js
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@ -337,7 +337,7 @@ this.getbit = function(d)
if (!d.bitcount--)
{
/* load next tag */
d.tag = d.source.charCodeAt(d.sourceIndex++) & 0xff;
d.tag = d.source[d.sourceIndex++] & 0xff;
d.bitcount = 7;
}
@ -355,11 +355,11 @@ this.read_bits = function(d, num, base)
return base;
var val = 0;
while (d.bitcount < 24) {
d.tag = d.tag | (d.source.charCodeAt(d.sourceIndex++) & 0xff) << d.bitcount;
while (d.bitcount < num) {
d.tag = d.tag | (d.source[d.sourceIndex++] & 0xff) << d.bitcount;
d.bitcount += 8;
}
val = d.tag & (0xff >> (8 - num));
val = d.tag & (0xffff >> (16 - num));
d.tag >>= num;
d.bitcount -= num;
return val + base;
@ -368,8 +368,8 @@ this.read_bits = function(d, num, base)
/* given a data stream and a tree, decode a symbol */
this.decode_symbol = function(d, t)
{
while (d.bitcount < 24) {
d.tag = d.tag | (d.source.charCodeAt(d.sourceIndex++) & 0xff) << d.bitcount;
while (d.bitcount < 10) {
d.tag = d.tag | (d.source[d.sourceIndex++] & 0xff) << d.bitcount;
d.bitcount += 8;
}
@ -488,6 +488,7 @@ this.inflate_block_data = function(d, lt, dt)
if (sym < 256)
{
ddest[ddestlength++] = sym; // ? String.fromCharCode(sym);
d.history.push(sym);
} else {
var length, dist, offs;
@ -503,12 +504,14 @@ this.inflate_block_data = function(d, lt, dt)
/* possibly get more bits from distance code */
offs = ddestlength - this.read_bits(d, this.dist_bits[dist], this.dist_base[dist]);
if (offs < 0)
throw ("Invalid zlib offset " + offs);
/* copy match */
for (i = offs; i < offs + length; ++i) {
if (i < 0)
ddest[ddestlength++] = d.history[d.history.length + i];
else
ddest[ddestlength++] = ddest[i];
ddest[ddestlength++] = ddest[i];
//ddest[ddestlength++] = d.history[i];
//d.history.push(d.history[i]);
}
}
}
@ -541,8 +544,10 @@ this.inflate_uncompressed_block = function(d)
d.sourceIndex += 4;
/* copy block */
for (i = length; i; --i)
for (i = length; i; --i) {
d.history.push(d.source[d.sourceIndex]);
d.dest[d.dest.length] = d.source[d.sourceIndex++];
}
/* make sure we start next block on a byte boundary */
d.bitcount = 0;
@ -597,13 +602,10 @@ this.reset = function()
/* inflate stream from source to dest */
this.uncompress = function(source, offset)
{
var d = this.d;
var bfinal;
if (Object.prototype.toString.call(source) === '[object Array]') {
source.charCodeAt = function(id) { return this[id]; }
}
/* initialise data */
d.source = source;
d.sourceIndex = offset;
@ -655,15 +657,8 @@ this.uncompress = function(source, offset)
} while (!bfinal && d.sourceIndex < d.source.length);
if (blocks != 2) throw ("Unexpected number of blocks");
if (Object.prototype.toString.call(source) !== '[object Array]') {
d.dest = d.dest.join('');
}
else {
d.history.push.apply(d.history, d.dest);
d.history = d.history.slice(-this.WINDOW_SIZE);
}
//d.history.push.apply(d.history, d.dest);
d.history = d.history.slice(-this.WINDOW_SIZE);
return { 'status' : this.OK, 'data' : d.dest };
}