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clean useless fields in gzip header

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nik 2014-04-17 20:44:19 -03:00
parent a4d7bdef8d
commit de4c26e3c8
3 changed files with 14 additions and 10 deletions
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3
lib/inflate.js
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@ -137,9 +137,6 @@ var Inflate = function(options) {
} }
this.header = new gzheader(); this.header = new gzheader();
this.header.name_max = 65536;
this.header.comm_max = 65536;
this.header.extra_max = 65536;
zlib_inflate.inflateGetHeader(this.strm, this.header); zlib_inflate.inflateGetHeader(this.strm, this.header);
}; };

10
lib/zlib/gzheader.js
View file

@ -14,16 +14,20 @@ function GZheader() {
this.extra = null; this.extra = null;
/* extra field length (valid if extra != Z_NULL) */ /* extra field length (valid if extra != Z_NULL) */
this.extra_len = 0; this.extra_len = 0;
/* setup limits is not necessary because in js we should not preallocate memory */
/* for inflate use constant limit in 65536 bytes */
/* space at extra (only when reading header) */ /* space at extra (only when reading header) */
this.extra_max = 0; /*this.extra_max = 0;*/
/* pointer to zero-terminated file name or Z_NULL */ /* pointer to zero-terminated file name or Z_NULL */
this.name = ''; this.name = '';
/* space at name (only when reading header) */ /* space at name (only when reading header) */
this.name_max = 0; /*this.name_max = 0;*/
/* pointer to zero-terminated comment or Z_NULL */ /* pointer to zero-terminated comment or Z_NULL */
this.comment = ''; this.comment = '';
/* space at comment (only when reading header) */ /* space at comment (only when reading header) */
this.comm_max = 0; /*this.comm_max = 0;*/
/* true if there was or will be a header crc */ /* true if there was or will be a header crc */
this.hcrc = 0; this.hcrc = 0;
/* true when done reading gzip header (not used when writing a gzip file) */ /* true when done reading gzip header (not used when writing a gzip file) */

11
lib/zlib/inflate.js
View file

@ -142,7 +142,6 @@ function InflateState() {
this.ndist = 0; /* number of distance code lengths */ this.ndist = 0; /* number of distance code lengths */
this.have = 0; /* number of code lengths in lens[] */ this.have = 0; /* number of code lengths in lens[] */
this.next = null; /* next available space in codes[] */ this.next = null; /* next available space in codes[] */
this.next_index = 0;
//unsigned short array //unsigned short array
//todo: test later with Uint16Array //todo: test later with Uint16Array
@ -610,7 +609,9 @@ function inflate(strm, flush) {
state.head.extra, state.head.extra,
input, input,
next, next,
len + copy > state.head.extra_max - len ? state.head.extra_max : copy, /* use constant limit because of extra field limitation in 65536 bytes */
len + copy > 65536 - len ? 65536 : copy,
/*len + copy > state.head.extra_max - len ? state.head.extra_max : copy,*/
len len
); );
//zmemcpy(state.head.extra + len, next, //zmemcpy(state.head.extra + len, next,
@ -636,8 +637,9 @@ function inflate(strm, flush) {
do { do {
// TODO: 2 or 1 bytes? // TODO: 2 or 1 bytes?
len = input[next + copy++]; len = input[next + copy++];
/* use constant limit because in js we should not preallocate memory */
if (state.head && len && if (state.head && len &&
(state.length < state.head.name_max)) { (state.length < 65536 /*state.head.name_max*/)) {
state.head.name += String.fromCharCode(len); state.head.name += String.fromCharCode(len);
} }
} while (len && copy < have); } while (len && copy < have);
@ -661,8 +663,9 @@ function inflate(strm, flush) {
copy = 0; copy = 0;
do { do {
len = input[next + copy++]; len = input[next + copy++];
/* use constant limit because in js we should not preallocate memory */
if (state.head && len && if (state.head && len &&
(state.length < state.head.comm_max)) { (state.length < 65536 /*state.head.comm_max*/)) {
state.head.comment += String.fromCharCode(len); state.head.comment += String.fromCharCode(len);
} }
} while (len && copy < have); } while (len && copy < have);