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Add option to not compute or check check values.

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9852c209ac

+ added macro renaming in
53ce271311
This commit is contained in:
Alex Kocharin 2022-06-08 18:51:39 +03:00
parent 8f630ba374
commit 024d11ee5f
1 changed files with 17 additions and 15 deletions
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32
lib/zlib/inflate.js
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@ -100,7 +100,8 @@ const zswap32 = (q) => {
function InflateState() {
this.mode = 0; /* current inflate mode */
this.last = false; /* true if processing last block */
this.wrap = 0; /* bit 0 true for zlib, bit 1 true for gzip */
this.wrap = 0; /* bit 0 true for zlib, bit 1 true for gzip,
bit 2 true to validate check value */
this.havedict = false; /* true if dictionary provided */
this.flags = 0; /* gzip header method and flags (0 if zlib) */
this.dmax = 0; /* zlib header max distance (INFLATE_STRICT) */
@ -208,7 +209,7 @@ const inflateReset2 = (strm, windowBits) => {
windowBits = -windowBits;
}
else {
wrap = (windowBits >> 4) + 1;
wrap = (windowBits >> 4) + 5;
if (windowBits < 48) {
windowBits &= 15;
}
@ -511,7 +512,7 @@ const inflate = (strm, flush) => {
if (state.head) {
state.head.text = ((hold >> 8) & 1);
}
if (state.flags & 0x0200) {
if ((state.flags & 0x0200) && (state.wrap & 4)) {
//=== CRC2(state.check, hold);
hbuf[0] = hold & 0xff;
hbuf[1] = (hold >>> 8) & 0xff;
@ -536,7 +537,7 @@ const inflate = (strm, flush) => {
if (state.head) {
state.head.time = hold;
}
if (state.flags & 0x0200) {
if ((state.flags & 0x0200) && (state.wrap & 4)) {
//=== CRC4(state.check, hold)
hbuf[0] = hold & 0xff;
hbuf[1] = (hold >>> 8) & 0xff;
@ -564,7 +565,7 @@ const inflate = (strm, flush) => {
state.head.xflags = (hold & 0xff);
state.head.os = (hold >> 8);
}
if (state.flags & 0x0200) {
if ((state.flags & 0x0200) && (state.wrap & 4)) {
//=== CRC2(state.check, hold);
hbuf[0] = hold & 0xff;
hbuf[1] = (hold >>> 8) & 0xff;
@ -591,7 +592,7 @@ const inflate = (strm, flush) => {
if (state.head) {
state.head.extra_len = hold;
}
if (state.flags & 0x0200) {
if ((state.flags & 0x0200) && (state.wrap & 4)) {
//=== CRC2(state.check, hold);
hbuf[0] = hold & 0xff;
hbuf[1] = (hold >>> 8) & 0xff;
@ -633,7 +634,7 @@ const inflate = (strm, flush) => {
// len + copy > state.head.extra_max ?
// state.head.extra_max - len : copy);
}
if (state.flags & 0x0200) {
if ((state.flags & 0x0200) && (state.wrap & 4)) {
state.check = crc32(state.check, input, copy, next);
}
have -= copy;
@ -659,7 +660,7 @@ const inflate = (strm, flush) => {
}
} while (len && copy < have);
if (state.flags & 0x0200) {
if ((state.flags & 0x0200) && (state.wrap & 4)) {
state.check = crc32(state.check, input, copy, next);
}
have -= copy;
@ -684,7 +685,7 @@ const inflate = (strm, flush) => {
state.head.comment += String.fromCharCode(len);
}
} while (len && copy < have);
if (state.flags & 0x0200) {
if ((state.flags & 0x0200) && (state.wrap & 4)) {
state.check = crc32(state.check, input, copy, next);
}
have -= copy;
@ -706,7 +707,7 @@ const inflate = (strm, flush) => {
bits += 8;
}
//===//
if (hold !== (state.check & 0xffff)) {
if ((state.wrap & 4) && hold !== (state.check & 0xffff)) {
strm.msg = 'header crc mismatch';
state.mode = BAD;
break;
@ -1359,15 +1360,15 @@ const inflate = (strm, flush) => {
_out -= left;
strm.total_out += _out;
state.total += _out;
if (_out) {
if ((state.wrap & 4) && _out) {
strm.adler = state.check =
/*UPDATE(state.check, put - _out, _out);*/
/*UPDATE_CHECK(state.check, put - _out, _out);*/
(state.flags ? crc32(state.check, output, _out, put - _out) : adler32(state.check, output, _out, put - _out));
}
_out = left;
// NB: crc32 stored as signed 32-bit int, zswap32 returns signed too
if ((state.flags ? hold : zswap32(hold)) !== state.check) {
if ((state.wrap & 4) && (state.flags ? hold : zswap32(hold)) !== state.check) {
strm.msg = 'incorrect data check';
state.mode = BAD;
break;
@ -1448,8 +1449,8 @@ const inflate = (strm, flush) => {
strm.total_in += _in;
strm.total_out += _out;
state.total += _out;
if (state.wrap && _out) {
strm.adler = state.check = /*UPDATE(state.check, strm.next_out - _out, _out);*/
if ((state.wrap & 4) && _out) {
strm.adler = state.check = /*UPDATE_CHECK(state.check, strm.next_out - _out, _out);*/
(state.flags ? crc32(state.check, output, _out, strm.next_out - _out) : adler32(state.check, output, _out, strm.next_out - _out));
}
strm.data_type = state.bits + (state.last ? 64 : 0) +
@ -1548,4 +1549,5 @@ module.exports.inflatePrime = inflatePrime;
module.exports.inflateSync = inflateSync;
module.exports.inflateSyncPoint = inflateSyncPoint;
module.exports.inflateUndermine = inflateUndermine;
module.exports.inflateValidate = inflateValidate;
*/