mirror/RetroArch
1
0
Fork 0
mirror of https://github.com/libretro/RetroArch synced 2025-02-19 03:40:59 +00:00
Code Issues Packages Projects Releases Wiki Activity

(deps/libz) Backport 9aaec95e82

Browse Source
This commit is contained in:
twinaphex 2020-07-01 23:39:26 +02:00
parent 043a60633f
commit b3d12c3dc9
3 changed files with 31 additions and 74 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

95
deps/libz/inffast.c vendored
View File

@ -10,25 +10,6 @@
#ifndef ASMINF
/* Allow machine dependent optimization for post-increment or pre-increment.
Based on testing to date,
Pre-increment preferred for:
- PowerPC G3 (Adler)
- MIPS R5000 (Randers-Pehrson)
Post-increment preferred for:
- none
No measurable difference:
- Pentium III (Anderson)
- M68060 (Nikl)
*/
#ifdef POSTINC
# define OFF 0
# define PUP(a) *(a)++
#else
# define OFF 1
# define PUP(a) *++(a)
#endif
/*
Decode literal, length, and distance codes and write out the resulting
literal and match bytes until either not enough input or output is
@ -72,9 +53,6 @@ void ZLIB_INTERNAL inflate_fast(z_streamp strm, unsigned start)
unsigned char FAR *out; /* local strm->next_out */
unsigned char FAR *beg; /* inflate()'s initial strm->next_out */
unsigned char FAR *end; /* while out < end, enough space available */
#ifdef INFLATE_STRICT
unsigned dmax; /* maximum distance from zlib header */
#endif
unsigned wsize; /* window size or zero if not using window */
unsigned whave; /* valid bytes in the window */
unsigned wnext; /* window write index */
@ -94,14 +72,11 @@ void ZLIB_INTERNAL inflate_fast(z_streamp strm, unsigned start)
/* copy state to local variables */
state = (struct inflate_state FAR *)strm->state;
in = strm->next_in - OFF;
in = strm->next_in;
last = in + (strm->avail_in - 5);
out = strm->next_out - OFF;
out = strm->next_out;
beg = out - (start - strm->avail_out);
end = out + (strm->avail_out - 257);
#ifdef INFLATE_STRICT
dmax = state->dmax;
#endif
wsize = state->wsize;
whave = state->whave;
wnext = state->wnext;
@ -117,9 +92,9 @@ void ZLIB_INTERNAL inflate_fast(z_streamp strm, unsigned start)
input data or output space */
do {
if (bits < 15) {
hold += (unsigned long)(PUP(in)) << bits;
hold += (unsigned long)(*in++) << bits;
bits += 8;
hold += (unsigned long)(PUP(in)) << bits;
hold += (unsigned long)(*in++) << bits;
bits += 8;
}
here = lcode[hold & lmask];
@ -132,14 +107,14 @@ dolen:
Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
"inflate: literal '%c'\n" :
"inflate: literal 0x%02x\n", here.val));
PUP(out) = (unsigned char)(here.val);
*out++ = (unsigned char)(here.val);
}
else if (op & 16) { /* length base */
len = (unsigned)(here.val);
op &= 15; /* number of extra bits */
if (op) {
if (bits < op) {
hold += (unsigned long)(PUP(in)) << bits;
hold += (unsigned long)(*in++) << bits;
bits += 8;
}
len += (unsigned)hold & ((1U << op) - 1);
@ -148,9 +123,9 @@ dolen:
}
Tracevv((stderr, "inflate: length %u\n", len));
if (bits < 15) {
hold += (unsigned long)(PUP(in)) << bits;
hold += (unsigned long)(*in++) << bits;
bits += 8;
hold += (unsigned long)(PUP(in)) << bits;
hold += (unsigned long)(*in++) << bits;
bits += 8;
}
here = dcode[hold & dmask];
@ -163,21 +138,14 @@ dodist:
dist = (unsigned)(here.val);
op &= 15; /* number of extra bits */
if (bits < op) {
hold += (unsigned long)(PUP(in)) << bits;
hold += (unsigned long)(*in++) << bits;
bits += 8;
if (bits < op) {
hold += (unsigned long)(PUP(in)) << bits;
hold += (unsigned long)(*in++) << bits;
bits += 8;
}
}
dist += (unsigned)hold & ((1U << op) - 1);
#ifdef INFLATE_STRICT
if (dist > dmax) {
strm->msg = (char *)"invalid distance too far back";
state->mode = BAD;
break;
}
#endif
hold >>= op;
bits -= op;
Tracevv((stderr, "inflate: distance %u\n", dist));
@ -194,30 +162,30 @@ dodist:
#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
if (len <= op - whave) {
do {
PUP(out) = 0;
*out++ = 0;
} while (--len);
continue;
}
len -= op - whave;
do {
PUP(out) = 0;
*out++ = 0;
} while (--op > whave);
if (op == 0) {
from = out - dist;
do {
PUP(out) = PUP(from);
*out++ = *from++;
} while (--len);
continue;
}
#endif
}
from = window - OFF;
from = window;
if (wnext == 0) { /* very common case */
from += wsize - op;
if (op < len) { /* some from window */
len -= op;
do {
PUP(out) = PUP(from);
*out++ = *from++;
} while (--op);
from = out - dist; /* rest from output */
}
@ -228,14 +196,14 @@ dodist:
if (op < len) { /* some from end of window */
len -= op;
do {
PUP(out) = PUP(from);
*out++ = *from++;
} while (--op);
from = window - OFF;
from = window;
if (wnext < len) { /* some from start of window */
op = wnext;
len -= op;
do {
PUP(out) = PUP(from);
*out++ = *from++;
} while (--op);
from = out - dist; /* rest from output */
}
@ -246,35 +214,35 @@ dodist:
if (op < len) { /* some from window */
len -= op;
do {
PUP(out) = PUP(from);
*out++ = *from++;
} while (--op);
from = out - dist; /* rest from output */
}
}
while (len > 2) {
PUP(out) = PUP(from);
PUP(out) = PUP(from);
PUP(out) = PUP(from);
*out++ = *from++;
*out++ = *from++;
*out++ = *from++;
len -= 3;
}
if (len) {
PUP(out) = PUP(from);
*out++ = *from++;
if (len > 1)
PUP(out) = PUP(from);
*out++ = *from++;
}
}
else {
from = out - dist; /* copy direct from output */
do { /* minimum length is three */
PUP(out) = PUP(from);
PUP(out) = PUP(from);
PUP(out) = PUP(from);
*out++ = *from++;
*out++ = *from++;
*out++ = *from++;
len -= 3;
} while (len > 2);
if (len) {
PUP(out) = PUP(from);
*out++ = *from++;
if (len > 1)
PUP(out) = PUP(from);
*out++ = *from++;
}
}
}
@ -311,14 +279,13 @@ dodist:
hold &= (1U << bits) - 1;
/* update state and return */
strm->next_in = in + OFF;
strm->next_out = out + OFF;
strm->next_in = in;
strm->next_out = out;
strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last));
strm->avail_out = (unsigned)(out < end ?
257 + (end - out) : 257 - (out - end));
state->hold = hold;
state->bits = bits;
return;
}
/*

9
deps/libz/inflate.c vendored
View File

@ -127,7 +127,6 @@ int inflateResetKeep(z_streamp strm)
state->mode = HEAD;
state->last = 0;
state->havedict = 0;
state->dmax = 32768U;
state->head = Z_NULL;
state->hold = 0;
state->bits = 0;
@ -671,7 +670,6 @@ int inflate(z_streamp strm, int flush)
state->mode = BAD;
break;
}
state->dmax = 1U << len;
Tracev((stderr, "inflate: zlib header ok\n"));
strm->adler = state->check = adler32(0L, Z_NULL, 0);
state->mode = hold & 0x200 ? DICTID : TYPE;
@ -1105,13 +1103,6 @@ int inflate(z_streamp strm, int flush)
DROPBITS(state->extra);
state->back += state->extra;
}
#ifdef INFLATE_STRICT
if (state->offset > state->dmax) {
strm->msg = (char *)"invalid distance too far back";
state->mode = BAD;
break;
}
#endif
Tracevv((stderr, "inflate: distance %u\n", state->offset));
state->mode = MATCH;
case MATCH:

1
deps/libz/inflate.h vendored
View File

@ -87,7 +87,6 @@ struct inflate_state {
int wrap; /* bit 0 true for zlib, bit 1 true for gzip */
int havedict; /* true if dictionary provided */
int flags; /* gzip header method and flags (0 if zlib) */
unsigned dmax; /* zlib header max distance (INFLATE_STRICT) */
unsigned long check; /* protected copy of check value */
unsigned long total; /* protected copy of output count */
gz_headerp head; /* where to save gzip header information */