618 lines
21 KiB
C
618 lines
21 KiB
C
/* infback9.c -- inflate deflate64 data using a call-back interface
|
|
* Copyright (C) 1995-2008 Mark Adler
|
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
|
*/
|
|
|
|
#include "zutil.h"
|
|
#include "infback9.h"
|
|
#include "inftree9.h"
|
|
#include "inflate9.h"
|
|
|
|
#define WSIZE 65536UL
|
|
|
|
/*
|
|
strm provides memory allocation functions in zalloc and zfree, or
|
|
Z_NULL to use the library memory allocation functions.
|
|
|
|
window is a user-supplied window and output buffer that is 64K bytes.
|
|
*/
|
|
int ZEXPORT inflateBack9Init_(strm, window, version, stream_size)
|
|
z_stream FAR *strm;
|
|
unsigned char FAR *window;
|
|
const char *version;
|
|
int stream_size;
|
|
{
|
|
struct inflate_state FAR *state;
|
|
|
|
if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
|
|
stream_size != (int)(sizeof(z_stream)))
|
|
return Z_VERSION_ERROR;
|
|
if (strm == Z_NULL || window == Z_NULL)
|
|
return Z_STREAM_ERROR;
|
|
strm->msg = Z_NULL; /* in case we return an error */
|
|
if (strm->zalloc == (alloc_func)0) {
|
|
strm->zalloc = zcalloc;
|
|
strm->opaque = (voidpf)0;
|
|
}
|
|
if (strm->zfree == (free_func)0) strm->zfree = zcfree;
|
|
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 = (voidpf)state;
|
|
state->window = window;
|
|
return Z_OK;
|
|
}
|
|
|
|
/*
|
|
Build and output length and distance decoding tables for fixed code
|
|
decoding.
|
|
*/
|
|
#ifdef MAKEFIXED
|
|
#include <stdio.h>
|
|
|
|
void makefixed9(void)
|
|
{
|
|
unsigned sym, bits, low, size;
|
|
code *next, *lenfix, *distfix;
|
|
struct inflate_state state;
|
|
code fixed[544];
|
|
|
|
/* literal/length table */
|
|
sym = 0;
|
|
while (sym < 144) state.lens[sym++] = 8;
|
|
while (sym < 256) state.lens[sym++] = 9;
|
|
while (sym < 280) state.lens[sym++] = 7;
|
|
while (sym < 288) state.lens[sym++] = 8;
|
|
next = fixed;
|
|
lenfix = next;
|
|
bits = 9;
|
|
inflate_table9(LENS, state.lens, 288, &(next), &(bits), state.work);
|
|
|
|
/* distance table */
|
|
sym = 0;
|
|
while (sym < 32) state.lens[sym++] = 5;
|
|
distfix = next;
|
|
bits = 5;
|
|
inflate_table9(DISTS, state.lens, 32, &(next), &(bits), state.work);
|
|
|
|
/* write tables */
|
|
puts(" /* inffix9.h -- table for decoding deflate64 fixed codes");
|
|
puts(" * Generated automatically by makefixed9().");
|
|
puts(" */");
|
|
puts("");
|
|
puts(" /* WARNING: this file should *not* be used by applications.");
|
|
puts(" It is part of the implementation of this library and is");
|
|
puts(" subject to change. Applications should only use zlib.h.");
|
|
puts(" */");
|
|
puts("");
|
|
size = 1U << 9;
|
|
printf(" static const code lenfix[%u] = {", size);
|
|
low = 0;
|
|
for (;;) {
|
|
if ((low % 6) == 0) printf("\n ");
|
|
printf("{%u,%u,%d}", lenfix[low].op, lenfix[low].bits,
|
|
lenfix[low].val);
|
|
if (++low == size) break;
|
|
putchar(',');
|
|
}
|
|
puts("\n };");
|
|
size = 1U << 5;
|
|
printf("\n static const code distfix[%u] = {", size);
|
|
low = 0;
|
|
for (;;) {
|
|
if ((low % 5) == 0) printf("\n ");
|
|
printf("{%u,%u,%d}", distfix[low].op, distfix[low].bits,
|
|
distfix[low].val);
|
|
if (++low == size) break;
|
|
putchar(',');
|
|
}
|
|
puts("\n };");
|
|
}
|
|
#endif /* MAKEFIXED */
|
|
|
|
/* Macros for inflateBack(): */
|
|
|
|
/* Clear the input bit accumulator */
|
|
#define INITBITS() \
|
|
do { \
|
|
hold = 0; \
|
|
bits = 0; \
|
|
} while (0)
|
|
|
|
/* Assure that some input is available. If input is requested, but denied,
|
|
then return a Z_BUF_ERROR from inflateBack(). */
|
|
#define PULL() \
|
|
do { \
|
|
if (have == 0) { \
|
|
have = in(in_desc, &next); \
|
|
if (have == 0) { \
|
|
next = Z_NULL; \
|
|
ret = Z_BUF_ERROR; \
|
|
goto inf_leave; \
|
|
} \
|
|
} \
|
|
} while (0)
|
|
|
|
/* Get a byte of input into the bit accumulator, or return from inflateBack()
|
|
with an error if there is no input available. */
|
|
#define PULLBYTE() \
|
|
do { \
|
|
PULL(); \
|
|
have--; \
|
|
hold += (unsigned long)(*next++) << bits; \
|
|
bits += 8; \
|
|
} while (0)
|
|
|
|
/* Assure that there are at least n bits in the bit accumulator. If there is
|
|
not enough available input to do that, then return from inflateBack() with
|
|
an error. */
|
|
#define NEEDBITS(n) \
|
|
do { \
|
|
while (bits < (unsigned)(n)) \
|
|
PULLBYTE(); \
|
|
} while (0)
|
|
|
|
/* Return the low n bits of the bit accumulator (n <= 16) */
|
|
#define BITS(n) \
|
|
((unsigned)hold & ((1U << (n)) - 1))
|
|
|
|
/* Remove n bits from the bit accumulator */
|
|
#define DROPBITS(n) \
|
|
do { \
|
|
hold >>= (n); \
|
|
bits -= (unsigned)(n); \
|
|
} while (0)
|
|
|
|
/* Remove zero to seven bits as needed to go to a byte boundary */
|
|
#define BYTEBITS() \
|
|
do { \
|
|
hold >>= bits & 7; \
|
|
bits -= bits & 7; \
|
|
} while (0)
|
|
|
|
/* Assure that some output space is available, by writing out the window
|
|
if it's full. If the write fails, return from inflateBack() with a
|
|
Z_BUF_ERROR. */
|
|
#define ROOM() \
|
|
do { \
|
|
if (left == 0) { \
|
|
put = window; \
|
|
left = WSIZE; \
|
|
wrap = 1; \
|
|
if (out(out_desc, put, (unsigned)left)) { \
|
|
ret = Z_BUF_ERROR; \
|
|
goto inf_leave; \
|
|
} \
|
|
} \
|
|
} while (0)
|
|
|
|
/*
|
|
strm provides the memory allocation functions and window buffer on input,
|
|
and provides information on the unused input on return. For Z_DATA_ERROR
|
|
returns, strm will also provide an error message.
|
|
|
|
in() and out() are the call-back input and output functions. When
|
|
inflateBack() needs more input, it calls in(). When inflateBack() has
|
|
filled the window with output, or when it completes with data in the
|
|
window, it calls out() to write out the data. The application must not
|
|
change the provided input until in() is called again or inflateBack()
|
|
returns. The application must not change the window/output buffer until
|
|
inflateBack() returns.
|
|
|
|
in() and out() are called with a descriptor parameter provided in the
|
|
inflateBack() call. This parameter can be a structure that provides the
|
|
information required to do the read or write, as well as accumulated
|
|
information on the input and output such as totals and check values.
|
|
|
|
in() should return zero on failure. out() should return non-zero on
|
|
failure. If either in() or out() fails, than inflateBack() returns a
|
|
Z_BUF_ERROR. strm->next_in can be checked for Z_NULL to see whether it
|
|
was in() or out() that caused in the error. Otherwise, inflateBack()
|
|
returns Z_STREAM_END on success, Z_DATA_ERROR for an deflate format
|
|
error, or Z_MEM_ERROR if it could not allocate memory for the state.
|
|
inflateBack() can also return Z_STREAM_ERROR if the input parameters
|
|
are not correct, i.e. strm is Z_NULL or the state was not initialized.
|
|
*/
|
|
int ZEXPORT inflateBack9(strm, in, in_desc, out, out_desc)
|
|
z_stream FAR *strm;
|
|
in_func in;
|
|
void FAR *in_desc;
|
|
out_func out;
|
|
void FAR *out_desc;
|
|
{
|
|
struct inflate_state FAR *state;
|
|
unsigned char FAR *next; /* next input */
|
|
unsigned char FAR *put; /* next output */
|
|
unsigned have; /* available input */
|
|
unsigned long left; /* available output */
|
|
inflate_mode mode; /* current inflate mode */
|
|
int lastblock; /* true if processing last block */
|
|
int wrap; /* true if the window has wrapped */
|
|
unsigned long write; /* window write index */
|
|
unsigned char FAR *window; /* allocated sliding window, if needed */
|
|
unsigned long hold; /* bit buffer */
|
|
unsigned bits; /* bits in bit buffer */
|
|
unsigned extra; /* extra bits needed */
|
|
unsigned long length; /* literal or length of data to copy */
|
|
unsigned long offset; /* distance back to copy string from */
|
|
unsigned long copy; /* number of stored or match bytes to copy */
|
|
unsigned char FAR *from; /* where to copy match bytes from */
|
|
code const FAR *lencode; /* starting table for length/literal codes */
|
|
code const FAR *distcode; /* starting table for distance codes */
|
|
unsigned lenbits; /* index bits for lencode */
|
|
unsigned distbits; /* index bits for distcode */
|
|
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 */
|
|
static const unsigned short order[19] = /* permutation of code lengths */
|
|
{16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
|
|
#include "inffix9.h"
|
|
|
|
/* Check that the strm exists and that the state was initialized */
|
|
if (strm == Z_NULL || strm->state == Z_NULL)
|
|
return Z_STREAM_ERROR;
|
|
state = (struct inflate_state FAR *)strm->state;
|
|
|
|
/* Reset the state */
|
|
strm->msg = Z_NULL;
|
|
mode = TYPE;
|
|
lastblock = 0;
|
|
write = 0;
|
|
wrap = 0;
|
|
window = state->window;
|
|
next = strm->next_in;
|
|
have = next != Z_NULL ? strm->avail_in : 0;
|
|
hold = 0;
|
|
bits = 0;
|
|
put = window;
|
|
left = WSIZE;
|
|
lencode = Z_NULL;
|
|
distcode = Z_NULL;
|
|
|
|
/* Inflate until end of block marked as last */
|
|
for (;;)
|
|
switch (mode) {
|
|
case TYPE:
|
|
/* determine and dispatch block type */
|
|
if (lastblock) {
|
|
BYTEBITS();
|
|
mode = DONE;
|
|
break;
|
|
}
|
|
NEEDBITS(3);
|
|
lastblock = BITS(1);
|
|
DROPBITS(1);
|
|
switch (BITS(2)) {
|
|
case 0: /* stored block */
|
|
Tracev((stderr, "inflate: stored block%s\n",
|
|
lastblock ? " (last)" : ""));
|
|
mode = STORED;
|
|
break;
|
|
case 1: /* fixed block */
|
|
lencode = lenfix;
|
|
lenbits = 9;
|
|
distcode = distfix;
|
|
distbits = 5;
|
|
Tracev((stderr, "inflate: fixed codes block%s\n",
|
|
lastblock ? " (last)" : ""));
|
|
mode = LEN; /* decode codes */
|
|
break;
|
|
case 2: /* dynamic block */
|
|
Tracev((stderr, "inflate: dynamic codes block%s\n",
|
|
lastblock ? " (last)" : ""));
|
|
mode = TABLE;
|
|
break;
|
|
case 3:
|
|
strm->msg = (char *)"invalid block type";
|
|
mode = BAD;
|
|
}
|
|
DROPBITS(2);
|
|
break;
|
|
|
|
case STORED:
|
|
/* get and verify stored block length */
|
|
BYTEBITS(); /* go to byte boundary */
|
|
NEEDBITS(32);
|
|
if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
|
|
strm->msg = (char *)"invalid stored block lengths";
|
|
mode = BAD;
|
|
break;
|
|
}
|
|
length = (unsigned)hold & 0xffff;
|
|
Tracev((stderr, "inflate: stored length %lu\n",
|
|
length));
|
|
INITBITS();
|
|
|
|
/* copy stored block from input to output */
|
|
while (length != 0) {
|
|
copy = length;
|
|
PULL();
|
|
ROOM();
|
|
if (copy > have) copy = have;
|
|
if (copy > left) copy = left;
|
|
zmemcpy(put, next, copy);
|
|
have -= copy;
|
|
next += copy;
|
|
left -= copy;
|
|
put += copy;
|
|
length -= copy;
|
|
}
|
|
Tracev((stderr, "inflate: stored end\n"));
|
|
mode = TYPE;
|
|
break;
|
|
|
|
case TABLE:
|
|
/* get dynamic table entries descriptor */
|
|
NEEDBITS(14);
|
|
state->nlen = BITS(5) + 257;
|
|
DROPBITS(5);
|
|
state->ndist = BITS(5) + 1;
|
|
DROPBITS(5);
|
|
state->ncode = BITS(4) + 4;
|
|
DROPBITS(4);
|
|
if (state->nlen > 286) {
|
|
strm->msg = (char *)"too many length symbols";
|
|
mode = BAD;
|
|
break;
|
|
}
|
|
Tracev((stderr, "inflate: table sizes ok\n"));
|
|
|
|
/* get code length code lengths (not a typo) */
|
|
state->have = 0;
|
|
while (state->have < state->ncode) {
|
|
NEEDBITS(3);
|
|
state->lens[order[state->have++]] = (unsigned short)BITS(3);
|
|
DROPBITS(3);
|
|
}
|
|
while (state->have < 19)
|
|
state->lens[order[state->have++]] = 0;
|
|
state->next = state->codes;
|
|
lencode = (code const FAR *)(state->next);
|
|
lenbits = 7;
|
|
ret = inflate_table9(CODES, state->lens, 19, &(state->next),
|
|
&(lenbits), state->work);
|
|
if (ret) {
|
|
strm->msg = (char *)"invalid code lengths set";
|
|
mode = BAD;
|
|
break;
|
|
}
|
|
Tracev((stderr, "inflate: code lengths ok\n"));
|
|
|
|
/* get length and distance code code lengths */
|
|
state->have = 0;
|
|
while (state->have < state->nlen + state->ndist) {
|
|
for (;;) {
|
|
here = lencode[BITS(lenbits)];
|
|
if ((unsigned)(here.bits) <= bits) break;
|
|
PULLBYTE();
|
|
}
|
|
if (here.val < 16) {
|
|
NEEDBITS(here.bits);
|
|
DROPBITS(here.bits);
|
|
state->lens[state->have++] = here.val;
|
|
}
|
|
else {
|
|
if (here.val == 16) {
|
|
NEEDBITS(here.bits + 2);
|
|
DROPBITS(here.bits);
|
|
if (state->have == 0) {
|
|
strm->msg = (char *)"invalid bit length repeat";
|
|
mode = BAD;
|
|
break;
|
|
}
|
|
len = (unsigned)(state->lens[state->have - 1]);
|
|
copy = 3 + BITS(2);
|
|
DROPBITS(2);
|
|
}
|
|
else if (here.val == 17) {
|
|
NEEDBITS(here.bits + 3);
|
|
DROPBITS(here.bits);
|
|
len = 0;
|
|
copy = 3 + BITS(3);
|
|
DROPBITS(3);
|
|
}
|
|
else {
|
|
NEEDBITS(here.bits + 7);
|
|
DROPBITS(here.bits);
|
|
len = 0;
|
|
copy = 11 + BITS(7);
|
|
DROPBITS(7);
|
|
}
|
|
if (state->have + copy > state->nlen + state->ndist) {
|
|
strm->msg = (char *)"invalid bit length repeat";
|
|
mode = BAD;
|
|
break;
|
|
}
|
|
while (copy--)
|
|
state->lens[state->have++] = (unsigned short)len;
|
|
}
|
|
}
|
|
|
|
/* handle error breaks in while */
|
|
if (mode == BAD) break;
|
|
|
|
/* check for end-of-block code (better have one) */
|
|
if (state->lens[256] == 0) {
|
|
strm->msg = (char *)"invalid code -- missing end-of-block";
|
|
mode = BAD;
|
|
break;
|
|
}
|
|
|
|
/* build code tables -- note: do not change the lenbits or distbits
|
|
values here (9 and 6) without reading the comments in inftree9.h
|
|
concerning the ENOUGH constants, which depend on those values */
|
|
state->next = state->codes;
|
|
lencode = (code const FAR *)(state->next);
|
|
lenbits = 9;
|
|
ret = inflate_table9(LENS, state->lens, state->nlen,
|
|
&(state->next), &(lenbits), state->work);
|
|
if (ret) {
|
|
strm->msg = (char *)"invalid literal/lengths set";
|
|
mode = BAD;
|
|
break;
|
|
}
|
|
distcode = (code const FAR *)(state->next);
|
|
distbits = 6;
|
|
ret = inflate_table9(DISTS, state->lens + state->nlen,
|
|
state->ndist, &(state->next), &(distbits),
|
|
state->work);
|
|
if (ret) {
|
|
strm->msg = (char *)"invalid distances set";
|
|
mode = BAD;
|
|
break;
|
|
}
|
|
Tracev((stderr, "inflate: codes ok\n"));
|
|
mode = LEN;
|
|
|
|
case LEN:
|
|
/* get a literal, length, or end-of-block code */
|
|
for (;;) {
|
|
here = lencode[BITS(lenbits)];
|
|
if ((unsigned)(here.bits) <= bits) break;
|
|
PULLBYTE();
|
|
}
|
|
if (here.op && (here.op & 0xf0) == 0) {
|
|
last = here;
|
|
for (;;) {
|
|
here = lencode[last.val +
|
|
(BITS(last.bits + last.op) >> last.bits)];
|
|
if ((unsigned)(last.bits + here.bits) <= bits) break;
|
|
PULLBYTE();
|
|
}
|
|
DROPBITS(last.bits);
|
|
}
|
|
DROPBITS(here.bits);
|
|
length = (unsigned)here.val;
|
|
|
|
/* process literal */
|
|
if (here.op == 0) {
|
|
Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
|
|
"inflate: literal '%c'\n" :
|
|
"inflate: literal 0x%02x\n", here.val));
|
|
ROOM();
|
|
*put++ = (unsigned char)(length);
|
|
left--;
|
|
mode = LEN;
|
|
break;
|
|
}
|
|
|
|
/* process end of block */
|
|
if (here.op & 32) {
|
|
Tracevv((stderr, "inflate: end of block\n"));
|
|
mode = TYPE;
|
|
break;
|
|
}
|
|
|
|
/* invalid code */
|
|
if (here.op & 64) {
|
|
strm->msg = (char *)"invalid literal/length code";
|
|
mode = BAD;
|
|
break;
|
|
}
|
|
|
|
/* length code -- get extra bits, if any */
|
|
extra = (unsigned)(here.op) & 31;
|
|
if (extra != 0) {
|
|
NEEDBITS(extra);
|
|
length += BITS(extra);
|
|
DROPBITS(extra);
|
|
}
|
|
Tracevv((stderr, "inflate: length %lu\n", length));
|
|
|
|
/* get distance code */
|
|
for (;;) {
|
|
here = distcode[BITS(distbits)];
|
|
if ((unsigned)(here.bits) <= bits) break;
|
|
PULLBYTE();
|
|
}
|
|
if ((here.op & 0xf0) == 0) {
|
|
last = here;
|
|
for (;;) {
|
|
here = distcode[last.val +
|
|
(BITS(last.bits + last.op) >> last.bits)];
|
|
if ((unsigned)(last.bits + here.bits) <= bits) break;
|
|
PULLBYTE();
|
|
}
|
|
DROPBITS(last.bits);
|
|
}
|
|
DROPBITS(here.bits);
|
|
if (here.op & 64) {
|
|
strm->msg = (char *)"invalid distance code";
|
|
mode = BAD;
|
|
break;
|
|
}
|
|
offset = (unsigned)here.val;
|
|
|
|
/* get distance extra bits, if any */
|
|
extra = (unsigned)(here.op) & 15;
|
|
if (extra != 0) {
|
|
NEEDBITS(extra);
|
|
offset += BITS(extra);
|
|
DROPBITS(extra);
|
|
}
|
|
if (offset > WSIZE - (wrap ? 0: left)) {
|
|
strm->msg = (char *)"invalid distance too far back";
|
|
mode = BAD;
|
|
break;
|
|
}
|
|
Tracevv((stderr, "inflate: distance %lu\n", offset));
|
|
|
|
/* copy match from window to output */
|
|
do {
|
|
ROOM();
|
|
copy = WSIZE - offset;
|
|
if (copy < left) {
|
|
from = put + copy;
|
|
copy = left - copy;
|
|
}
|
|
else {
|
|
from = put - offset;
|
|
copy = left;
|
|
}
|
|
if (copy > length) copy = length;
|
|
length -= copy;
|
|
left -= copy;
|
|
do {
|
|
*put++ = *from++;
|
|
} while (--copy);
|
|
} while (length != 0);
|
|
break;
|
|
|
|
case DONE:
|
|
/* inflate stream terminated properly -- write leftover output */
|
|
ret = Z_STREAM_END;
|
|
if (left < WSIZE) {
|
|
if (out(out_desc, window, (unsigned)(WSIZE - left)))
|
|
ret = Z_BUF_ERROR;
|
|
}
|
|
goto inf_leave;
|
|
|
|
case BAD:
|
|
ret = Z_DATA_ERROR;
|
|
goto inf_leave;
|
|
|
|
default: /* can't happen, but makes compilers happy */
|
|
ret = Z_STREAM_ERROR;
|
|
goto inf_leave;
|
|
}
|
|
|
|
/* Return unused input */
|
|
inf_leave:
|
|
strm->next_in = next;
|
|
strm->avail_in = have;
|
|
return ret;
|
|
}
|
|
|
|
int ZEXPORT inflateBack9End(strm)
|
|
z_stream FAR *strm;
|
|
{
|
|
if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
|
|
return Z_STREAM_ERROR;
|
|
ZFREE(strm, strm->state);
|
|
strm->state = Z_NULL;
|
|
Tracev((stderr, "inflate: end\n"));
|
|
return Z_OK;
|
|
}
|