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-rw-r--r--lib/libz/infback.c154
1 files changed, 104 insertions, 50 deletions
diff --git a/lib/libz/infback.c b/lib/libz/infback.c
index e980358..037ecac 100644
--- a/lib/libz/infback.c
+++ b/lib/libz/infback.c
@@ -1,5 +1,6 @@
+/* $OpenBSD: infback.c,v 1.7 2021/07/04 14:24:49 tb Exp $ */
/* infback.c -- inflate using a call-back interface
- * Copyright (C) 1995-2005 Mark Adler
+ * Copyright (C) 1995-2016 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*/
@@ -42,20 +43,29 @@ int stream_size;
return Z_STREAM_ERROR;
strm->msg = Z_NULL; /* in case we return an error */
if (strm->zalloc == (alloc_func)0) {
+#ifdef Z_SOLO
+ return Z_STREAM_ERROR;
+#else
strm->zalloc = zcalloc;
strm->opaque = (voidpf)0;
+#endif
}
- if (strm->zfree == (free_func)0) strm->zfree = zcfree;
+ if (strm->zfree == (free_func)0)
+#ifdef Z_SOLO
+ return Z_STREAM_ERROR;
+#else
+ strm->zfree = zcfree;
+#endif
state = (struct inflate_state FAR *)ZALLOC(strm, 1,
sizeof(struct inflate_state));
if (state == Z_NULL) return Z_MEM_ERROR;
Tracev((stderr, "inflate: allocated\n"));
strm->state = (struct internal_state FAR *)state;
state->dmax = 32768U;
- state->wbits = windowBits;
+ state->wbits = (uInt)windowBits;
state->wsize = 1U << windowBits;
state->window = window;
- state->write = 0;
+ state->wnext = 0;
state->whave = 0;
return Z_OK;
}
@@ -253,7 +263,7 @@ void FAR *out_desc;
unsigned bits; /* bits in bit buffer */
unsigned copy; /* number of stored or match bytes to copy */
unsigned char FAR *from; /* where to copy match bytes from */
- code this; /* current decoding table entry */
+ code here; /* current decoding table entry */
code last; /* parent table entry */
unsigned len; /* length to copy for repeats, bits to drop */
int ret; /* return code */
@@ -308,8 +318,8 @@ void FAR *out_desc;
state->mode = TABLE;
break;
case 3:
-#ifdef SMALL
- strm->msg = "error";
+#ifdef SMALL
+ strm->msg = "error";
#else
strm->msg = (char *)"invalid block type";
#endif
@@ -323,8 +333,8 @@ void FAR *out_desc;
BYTEBITS(); /* go to byte boundary */
NEEDBITS(32);
if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
-#ifdef SMALL
- strm->msg = "error";
+#ifdef SMALL
+ strm->msg = "error";
#else
strm->msg = (char *)"invalid stored block lengths";
#endif
@@ -365,8 +375,8 @@ void FAR *out_desc;
DROPBITS(4);
#ifndef PKZIP_BUG_WORKAROUND
if (state->nlen > 286 || state->ndist > 30) {
-#ifdef SMALL
- strm->msg = "error";
+#ifdef SMALL
+ strm->msg = "error";
#else
strm->msg = (char *)"too many length or distance symbols";
#endif
@@ -391,7 +401,11 @@ void FAR *out_desc;
ret = inflate_table(CODES, state->lens, 19, &(state->next),
&(state->lenbits), state->work);
if (ret) {
+#ifdef SMALL
+ strm->msg = "error";
+#else
strm->msg = (char *)"invalid code lengths set";
+#endif
state->mode = BAD;
break;
}
@@ -401,21 +415,24 @@ void FAR *out_desc;
state->have = 0;
while (state->have < state->nlen + state->ndist) {
for (;;) {
- this = state->lencode[BITS(state->lenbits)];
- if ((unsigned)(this.bits) <= bits) break;
+ here = state->lencode[BITS(state->lenbits)];
+ if ((unsigned)(here.bits) <= bits) break;
PULLBYTE();
}
- if (this.val < 16) {
- NEEDBITS(this.bits);
- DROPBITS(this.bits);
- state->lens[state->have++] = this.val;
+ if (here.val < 16) {
+ DROPBITS(here.bits);
+ state->lens[state->have++] = here.val;
}
else {
- if (this.val == 16) {
- NEEDBITS(this.bits + 2);
- DROPBITS(this.bits);
+ if (here.val == 16) {
+ NEEDBITS(here.bits + 2);
+ DROPBITS(here.bits);
if (state->have == 0) {
+#ifdef SMALL
+ strm->msg = "error";
+#else
strm->msg = (char *)"invalid bit length repeat";
+#endif
state->mode = BAD;
break;
}
@@ -423,22 +440,26 @@ void FAR *out_desc;
copy = 3 + BITS(2);
DROPBITS(2);
}
- else if (this.val == 17) {
- NEEDBITS(this.bits + 3);
- DROPBITS(this.bits);
+ else if (here.val == 17) {
+ NEEDBITS(here.bits + 3);
+ DROPBITS(here.bits);
len = 0;
copy = 3 + BITS(3);
DROPBITS(3);
}
else {
- NEEDBITS(this.bits + 7);
- DROPBITS(this.bits);
+ NEEDBITS(here.bits + 7);
+ DROPBITS(here.bits);
len = 0;
copy = 11 + BITS(7);
DROPBITS(7);
}
if (state->have + copy > state->nlen + state->ndist) {
+#ifdef SMALL
+ strm->msg = "error";
+#else
strm->msg = (char *)"invalid bit length repeat";
+#endif
state->mode = BAD;
break;
}
@@ -450,14 +471,31 @@ void FAR *out_desc;
/* handle error breaks in while */
if (state->mode == BAD) break;
- /* build code tables */
+ /* check for end-of-block code (better have one) */
+ if (state->lens[256] == 0) {
+#ifdef SMALL
+ strm->msg = "error";
+#else
+ strm->msg = (char *)"invalid code -- missing end-of-block";
+#endif
+ state->mode = BAD;
+ break;
+ }
+
+ /* build code tables -- note: do not change the lenbits or distbits
+ values here (9 and 6) without reading the comments in inftrees.h
+ concerning the ENOUGH constants, which depend on those values */
state->next = state->codes;
state->lencode = (code const FAR *)(state->next);
state->lenbits = 9;
ret = inflate_table(LENS, state->lens, state->nlen, &(state->next),
&(state->lenbits), state->work);
if (ret) {
+#ifdef SMALL
+ strm->msg = "error";
+#else
strm->msg = (char *)"invalid literal/lengths set";
+#endif
state->mode = BAD;
break;
}
@@ -466,7 +504,11 @@ void FAR *out_desc;
ret = inflate_table(DISTS, state->lens + state->nlen, state->ndist,
&(state->next), &(state->distbits), state->work);
if (ret) {
+#ifdef SMALL
+ strm->msg = "error";
+#else
strm->msg = (char *)"invalid distances set";
+#endif
state->mode = BAD;
break;
}
@@ -488,28 +530,28 @@ void FAR *out_desc;
/* get a literal, length, or end-of-block code */
for (;;) {
- this = state->lencode[BITS(state->lenbits)];
- if ((unsigned)(this.bits) <= bits) break;
+ here = state->lencode[BITS(state->lenbits)];
+ if ((unsigned)(here.bits) <= bits) break;
PULLBYTE();
}
- if (this.op && (this.op & 0xf0) == 0) {
- last = this;
+ if (here.op && (here.op & 0xf0) == 0) {
+ last = here;
for (;;) {
- this = state->lencode[last.val +
+ here = state->lencode[last.val +
(BITS(last.bits + last.op) >> last.bits)];
- if ((unsigned)(last.bits + this.bits) <= bits) break;
+ if ((unsigned)(last.bits + here.bits) <= bits) break;
PULLBYTE();
}
DROPBITS(last.bits);
}
- DROPBITS(this.bits);
- state->length = (unsigned)this.val;
+ DROPBITS(here.bits);
+ state->length = (unsigned)here.val;
/* process literal */
- if (this.op == 0) {
- Tracevv((stderr, this.val >= 0x20 && this.val < 0x7f ?
+ if (here.op == 0) {
+ Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
"inflate: literal '%c'\n" :
- "inflate: literal 0x%02x\n", this.val));
+ "inflate: literal 0x%02x\n", here.val));
ROOM();
*put++ = (unsigned char)(state->length);
left--;
@@ -518,21 +560,25 @@ void FAR *out_desc;
}
/* process end of block */
- if (this.op & 32) {
+ if (here.op & 32) {
Tracevv((stderr, "inflate: end of block\n"));
state->mode = TYPE;
break;
}
/* invalid code */
- if (this.op & 64) {
+ if (here.op & 64) {
+#ifdef SMALL
+ strm->msg = "error";
+#else
strm->msg = (char *)"invalid literal/length code";
+#endif
state->mode = BAD;
break;
}
/* length code -- get extra bits, if any */
- state->extra = (unsigned)(this.op) & 15;
+ state->extra = (unsigned)(here.op) & 15;
if (state->extra != 0) {
NEEDBITS(state->extra);
state->length += BITS(state->extra);
@@ -542,30 +588,34 @@ void FAR *out_desc;
/* get distance code */
for (;;) {
- this = state->distcode[BITS(state->distbits)];
- if ((unsigned)(this.bits) <= bits) break;
+ here = state->distcode[BITS(state->distbits)];
+ if ((unsigned)(here.bits) <= bits) break;
PULLBYTE();
}
- if ((this.op & 0xf0) == 0) {
- last = this;
+ if ((here.op & 0xf0) == 0) {
+ last = here;
for (;;) {
- this = state->distcode[last.val +
+ here = state->distcode[last.val +
(BITS(last.bits + last.op) >> last.bits)];
- if ((unsigned)(last.bits + this.bits) <= bits) break;
+ if ((unsigned)(last.bits + here.bits) <= bits) break;
PULLBYTE();
}
DROPBITS(last.bits);
}
- DROPBITS(this.bits);
- if (this.op & 64) {
+ DROPBITS(here.bits);
+ if (here.op & 64) {
+#ifdef SMALL
+ strm->msg = "error";
+#else
strm->msg = (char *)"invalid distance code";
+#endif
state->mode = BAD;
break;
}
- state->offset = (unsigned)this.val;
+ state->offset = (unsigned)here.val;
/* get distance extra bits, if any */
- state->extra = (unsigned)(this.op) & 15;
+ state->extra = (unsigned)(here.op) & 15;
if (state->extra != 0) {
NEEDBITS(state->extra);
state->offset += BITS(state->extra);
@@ -573,7 +623,11 @@ void FAR *out_desc;
}
if (state->offset > state->wsize - (state->whave < state->wsize ?
left : 0)) {
+#ifdef SMALL
+ strm->msg = "error";
+#else
strm->msg = (char *)"invalid distance too far back";
+#endif
state->mode = BAD;
break;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 15:44:14 +0000