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Change gzip header extra to native array for convenience

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This commit is contained in:
Vitaly Puzrin 2014-04-18 09:30:59 +04:00
parent de4c26e3c8
commit d71a712e68
3 changed files with 15 additions and 12 deletions
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4
lib/utils/common.js
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@ -38,9 +38,7 @@ exports.shrinkBuf = function (buf, size) {
var fnTyped = { var fnTyped = {
arraySet: function (dest, src, src_offs, len, dest_offs) { arraySet: function (dest, src, src_offs, len, dest_offs) {
// Suppose, that with typed array support destination is if (src.subarray && dest.subarray) {
// always typed - don't check it
if (src.subarray) {
dest.set(src.subarray(src_offs, src_offs+len), dest_offs); dest.set(src.subarray(src_offs, src_offs+len), dest_offs);
return; return;
} }

15
lib/zlib/gzheader.js
View file

@ -13,21 +13,24 @@ function GZheader() {
/* pointer to extra field or Z_NULL if none */ /* pointer to extra field or Z_NULL if none */
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; // Actually, we don't need it in JS,
// but leave for few code modifications
/* setup limits is not necessary because in js we should not preallocate memory */ //
/* for inflate use constant limit in 65536 bytes */ // 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) */

8
lib/zlib/inflate.js
View file

@ -603,14 +603,16 @@ function inflate(strm, flush) {
if (state.head) { if (state.head) {
len = state.head.extra_len - state.length; len = state.head.extra_len - state.length;
if (!state.head.extra) { if (!state.head.extra) {
state.head.extra = new utils.Buf8(state.head.extra_len); // Use untyped array for more conveniend processing later
state.head.extra = new Array(state.head.extra_len);
} }
utils.arraySet( utils.arraySet(
state.head.extra, state.head.extra,
input, input,
next, next,
/* use constant limit because of extra field limitation in 65536 bytes */ // extra field is limited to 65536 bytes
len + copy > 65536 - len ? 65536 : copy, // - no need for additional size check
copy,
/*len + copy > state.head.extra_max - len ? state.head.extra_max : copy,*/ /*len + copy > state.head.extra_max - len ? state.head.extra_max : copy,*/
len len
); );