forked from rrcarlosr/Jetpack
944 lines
34 KiB
C
944 lines
34 KiB
C
/* inflate.c -- zlib decompression
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* Copyright (C) 1995-2005 Mark Adler
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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local void fixedtables OF((struct inflate_state FAR *state));
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local int updatewindow OF((z_streamp strm, unsigned out));
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int ZEXPORT inflateReset(z_streamp strm)
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{
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struct inflate_state FAR *state;
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if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
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state = (struct inflate_state FAR *)strm->state;
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strm->total_in = strm->total_out = state->total = 0;
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strm->msg = Z_NULL;
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strm->adler = 1; /* to support ill-conceived Java test suite */
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state->mode = HEAD;
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state->last = 0;
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state->havedict = 0;
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state->dmax = 32768U;
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state->head = Z_NULL;
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state->wsize = 0;
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state->whave = 0;
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state->write = 0;
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state->hold = 0;
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state->bits = 0;
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state->lencode = state->distcode = state->next = state->codes;
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WATCHDOG_RESET();
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Tracev((stderr, "inflate: reset\n"));
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return Z_OK;
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}
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int ZEXPORT inflateInit2_(z_streamp strm, int windowBits, const char *version,
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int stream_size)
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{
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struct inflate_state FAR *state;
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if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
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stream_size != (int)(sizeof(z_stream)))
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return Z_VERSION_ERROR;
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if (strm == Z_NULL) return Z_STREAM_ERROR;
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strm->msg = Z_NULL; /* in case we return an error */
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if (strm->zalloc == (alloc_func)0) {
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strm->zalloc = zcalloc;
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strm->opaque = (voidpf)0;
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}
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if (strm->zfree == (free_func)0) strm->zfree = zcfree;
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state = (struct inflate_state FAR *)
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ZALLOC(strm, 1, sizeof(struct inflate_state));
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if (state == Z_NULL) return Z_MEM_ERROR;
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Tracev((stderr, "inflate: allocated\n"));
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strm->state = (struct internal_state FAR *)state;
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if (windowBits < 0) {
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state->wrap = 0;
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windowBits = -windowBits;
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}
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else {
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state->wrap = (windowBits >> 4) + 1;
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#ifdef GUNZIP
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if (windowBits < 48) windowBits &= 15;
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#endif
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}
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if (windowBits < 8 || windowBits > 15) {
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ZFREE(strm, state);
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strm->state = Z_NULL;
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return Z_STREAM_ERROR;
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}
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state->wbits = (unsigned)windowBits;
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state->window = Z_NULL;
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return inflateReset(strm);
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}
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int ZEXPORT inflateInit_(z_streamp strm, const char *version, int stream_size)
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{
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return inflateInit2_(strm, DEF_WBITS, version, stream_size);
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}
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local void fixedtables(struct inflate_state FAR *state)
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{
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state->lencode = lenfix;
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state->lenbits = 9;
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state->distcode = distfix;
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state->distbits = 5;
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}
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/*
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Update the window with the last wsize (normally 32K) bytes written before
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returning. If window does not exist yet, create it. This is only called
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when a window is already in use, or when output has been written during this
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inflate call, but the end of the deflate stream has not been reached yet.
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It is also called to create a window for dictionary data when a dictionary
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is loaded.
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Providing output buffers larger than 32K to inflate() should provide a speed
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advantage, since only the last 32K of output is copied to the sliding window
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upon return from inflate(), and since all distances after the first 32K of
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output will fall in the output data, making match copies simpler and faster.
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The advantage may be dependent on the size of the processor's data caches.
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*/
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local int updatewindow(z_streamp strm, unsigned out)
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{
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struct inflate_state FAR *state;
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unsigned copy, dist;
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state = (struct inflate_state FAR *)strm->state;
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/* if it hasn't been done already, allocate space for the window */
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if (state->window == Z_NULL) {
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state->window = (unsigned char FAR *)
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ZALLOC(strm, 1U << state->wbits,
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sizeof(unsigned char));
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if (state->window == Z_NULL) return 1;
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}
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/* if window not in use yet, initialize */
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if (state->wsize == 0) {
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state->wsize = 1U << state->wbits;
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state->write = 0;
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state->whave = 0;
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}
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/* copy state->wsize or less output bytes into the circular window */
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copy = out - strm->avail_out;
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if (copy >= state->wsize) {
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zmemcpy(state->window, strm->next_out - state->wsize, state->wsize);
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state->write = 0;
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state->whave = state->wsize;
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}
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else {
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dist = state->wsize - state->write;
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if (dist > copy) dist = copy;
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zmemcpy(state->window + state->write, strm->next_out - copy, dist);
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copy -= dist;
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if (copy) {
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zmemcpy(state->window, strm->next_out - copy, copy);
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state->write = copy;
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state->whave = state->wsize;
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}
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else {
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state->write += dist;
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if (state->write == state->wsize) state->write = 0;
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if (state->whave < state->wsize) state->whave += dist;
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}
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}
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return 0;
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}
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/* Macros for inflate(): */
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/* check function to use adler32() for zlib or crc32() for gzip */
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#ifdef GUNZIP
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# define UPDATE(check, buf, len) \
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(state->flags ? crc32(check, buf, len) : adler32(check, buf, len))
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#else
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# define UPDATE(check, buf, len) adler32(check, buf, len)
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#endif
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/* check macros for header crc */
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#ifdef GUNZIP
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# define CRC2(check, word) \
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do { \
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hbuf[0] = (unsigned char)(word); \
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hbuf[1] = (unsigned char)((word) >> 8); \
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check = crc32(check, hbuf, 2); \
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} while (0)
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# define CRC4(check, word) \
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do { \
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hbuf[0] = (unsigned char)(word); \
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hbuf[1] = (unsigned char)((word) >> 8); \
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hbuf[2] = (unsigned char)((word) >> 16); \
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hbuf[3] = (unsigned char)((word) >> 24); \
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check = crc32(check, hbuf, 4); \
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} while (0)
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#endif
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/* Load registers with state in inflate() for speed */
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#define LOAD() \
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do { \
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put = strm->next_out; \
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left = strm->avail_out; \
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next = strm->next_in; \
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have = strm->avail_in; \
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hold = state->hold; \
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bits = state->bits; \
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} while (0)
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/* Restore state from registers in inflate() */
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#define RESTORE() \
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do { \
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strm->next_out = put; \
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strm->avail_out = left; \
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strm->next_in = next; \
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strm->avail_in = have; \
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state->hold = hold; \
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state->bits = bits; \
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} while (0)
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/* Clear the input bit accumulator */
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#define INITBITS() \
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do { \
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hold = 0; \
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bits = 0; \
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} while (0)
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/* Get a byte of input into the bit accumulator, or return from inflate()
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if there is no input available. */
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#define PULLBYTE() \
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do { \
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if (have == 0) goto inf_leave; \
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have--; \
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hold += (unsigned long)(*next++) << bits; \
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bits += 8; \
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} while (0)
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/* Assure that there are at least n bits in the bit accumulator. If there is
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not enough available input to do that, then return from inflate(). */
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#define NEEDBITS(n) \
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do { \
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while (bits < (unsigned)(n)) \
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PULLBYTE(); \
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} while (0)
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/* Return the low n bits of the bit accumulator (n < 16) */
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#define BITS(n) \
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((unsigned)hold & ((1U << (n)) - 1))
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/* Remove n bits from the bit accumulator */
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#define DROPBITS(n) \
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do { \
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hold >>= (n); \
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bits -= (unsigned)(n); \
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} while (0)
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/* Remove zero to seven bits as needed to go to a byte boundary */
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#define BYTEBITS() \
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do { \
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hold >>= bits & 7; \
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bits -= bits & 7; \
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} while (0)
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/* Reverse the bytes in a 32-bit value */
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#define REVERSE(q) \
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((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
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(((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
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/*
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inflate() uses a state machine to process as much input data and generate as
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much output data as possible before returning. The state machine is
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structured roughly as follows:
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for (;;) switch (state) {
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...
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case STATEn:
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if (not enough input data or output space to make progress)
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return;
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... make progress ...
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state = STATEm;
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break;
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...
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}
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so when inflate() is called again, the same case is attempted again, and
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if the appropriate resources are provided, the machine proceeds to the
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next state. The NEEDBITS() macro is usually the way the state evaluates
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whether it can proceed or should return. NEEDBITS() does the return if
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the requested bits are not available. The typical use of the BITS macros
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is:
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NEEDBITS(n);
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... do something with BITS(n) ...
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DROPBITS(n);
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where NEEDBITS(n) either returns from inflate() if there isn't enough
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input left to load n bits into the accumulator, or it continues. BITS(n)
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gives the low n bits in the accumulator. When done, DROPBITS(n) drops
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the low n bits off the accumulator. INITBITS() clears the accumulator
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and sets the number of available bits to zero. BYTEBITS() discards just
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enough bits to put the accumulator on a byte boundary. After BYTEBITS()
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and a NEEDBITS(8), then BITS(8) would return the next byte in the stream.
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NEEDBITS(n) uses PULLBYTE() to get an available byte of input, or to return
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if there is no input available. The decoding of variable length codes uses
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PULLBYTE() directly in order to pull just enough bytes to decode the next
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code, and no more.
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Some states loop until they get enough input, making sure that enough
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state information is maintained to continue the loop where it left off
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if NEEDBITS() returns in the loop. For example, want, need, and keep
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would all have to actually be part of the saved state in case NEEDBITS()
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returns:
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case STATEw:
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while (want < need) {
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NEEDBITS(n);
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keep[want++] = BITS(n);
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DROPBITS(n);
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}
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state = STATEx;
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case STATEx:
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As shown above, if the next state is also the next case, then the break
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is omitted.
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A state may also return if there is not enough output space available to
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complete that state. Those states are copying stored data, writing a
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literal byte, and copying a matching string.
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When returning, a "goto inf_leave" is used to update the total counters,
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update the check value, and determine whether any progress has been made
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during that inflate() call in order to return the proper return code.
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Progress is defined as a change in either strm->avail_in or strm->avail_out.
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When there is a window, goto inf_leave will update the window with the last
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output written. If a goto inf_leave occurs in the middle of decompression
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and there is no window currently, goto inf_leave will create one and copy
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output to the window for the next call of inflate().
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In this implementation, the flush parameter of inflate() only affects the
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return code (per zlib.h). inflate() always writes as much as possible to
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strm->next_out, given the space available and the provided input--the effect
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documented in zlib.h of Z_SYNC_FLUSH. Furthermore, inflate() always defers
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the allocation of and copying into a sliding window until necessary, which
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provides the effect documented in zlib.h for Z_FINISH when the entire input
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stream available. So the only thing the flush parameter actually does is:
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when flush is set to Z_FINISH, inflate() cannot return Z_OK. Instead it
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will return Z_BUF_ERROR if it has not reached the end of the stream.
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*/
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int ZEXPORT inflate(z_streamp strm, int flush)
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{
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struct inflate_state FAR *state;
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unsigned char FAR *next; /* next input */
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unsigned char FAR *put; /* next output */
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unsigned have, left; /* available input and output */
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unsigned long hold; /* bit buffer */
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unsigned bits; /* bits in bit buffer */
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unsigned in, out; /* save starting available input and output */
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unsigned copy; /* number of stored or match bytes to copy */
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unsigned char FAR *from; /* where to copy match bytes from */
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code this; /* current decoding table entry */
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code last; /* parent table entry */
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unsigned len; /* length to copy for repeats, bits to drop */
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int ret; /* return code */
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#ifdef GUNZIP
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unsigned char hbuf[4]; /* buffer for gzip header crc calculation */
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#endif
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static const unsigned short order[19] = /* permutation of code lengths */
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{16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
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if (strm == Z_NULL || strm->state == Z_NULL ||
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(strm->next_in == Z_NULL && strm->avail_in != 0))
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return Z_STREAM_ERROR;
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state = (struct inflate_state FAR *)strm->state;
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if (state->mode == TYPE) state->mode = TYPEDO; /* skip check */
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LOAD();
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in = have;
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out = left;
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ret = Z_OK;
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for (;;)
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switch (state->mode) {
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case HEAD:
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if (state->wrap == 0) {
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state->mode = TYPEDO;
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break;
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}
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NEEDBITS(16);
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#ifdef GUNZIP
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if ((state->wrap & 2) && hold == 0x8b1f) { /* gzip header */
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state->check = crc32(0L, Z_NULL, 0);
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CRC2(state->check, hold);
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INITBITS();
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state->mode = FLAGS;
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break;
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}
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state->flags = 0; /* expect zlib header */
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if (state->head != Z_NULL)
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state->head->done = -1;
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if (!(state->wrap & 1) || /* check if zlib header allowed */
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#else
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if (
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#endif
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((BITS(8) << 8) + (hold >> 8)) % 31) {
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strm->msg = (char *)"incorrect header check";
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state->mode = BAD;
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break;
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}
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if (BITS(4) != Z_DEFLATED) {
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strm->msg = (char *)"unknown compression method";
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state->mode = BAD;
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break;
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}
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DROPBITS(4);
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len = BITS(4) + 8;
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if (len > state->wbits) {
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strm->msg = (char *)"invalid window size";
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state->mode = BAD;
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break;
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}
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state->dmax = 1U << len;
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Tracev((stderr, "inflate: zlib header ok\n"));
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strm->adler = state->check = adler32(0L, Z_NULL, 0);
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state->mode = hold & 0x200 ? DICTID : TYPE;
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INITBITS();
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break;
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#ifdef GUNZIP
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case FLAGS:
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NEEDBITS(16);
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state->flags = (int)(hold);
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if ((state->flags & 0xff) != Z_DEFLATED) {
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strm->msg = (char *)"unknown compression method";
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state->mode = BAD;
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break;
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}
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if (state->flags & 0xe000) {
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strm->msg = (char *)"unknown header flags set";
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state->mode = BAD;
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break;
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}
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if (state->head != Z_NULL)
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state->head->text = (int)((hold >> 8) & 1);
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if (state->flags & 0x0200) CRC2(state->check, hold);
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INITBITS();
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state->mode = TIME;
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case TIME:
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NEEDBITS(32);
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if (state->head != Z_NULL)
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state->head->time = hold;
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if (state->flags & 0x0200) CRC4(state->check, hold);
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INITBITS();
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state->mode = OS;
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case OS:
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NEEDBITS(16);
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if (state->head != Z_NULL) {
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state->head->xflags = (int)(hold & 0xff);
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state->head->os = (int)(hold >> 8);
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}
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if (state->flags & 0x0200) CRC2(state->check, hold);
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INITBITS();
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state->mode = EXLEN;
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case EXLEN:
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if (state->flags & 0x0400) {
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NEEDBITS(16);
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state->length = (unsigned)(hold);
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if (state->head != Z_NULL)
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state->head->extra_len = (unsigned)hold;
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if (state->flags & 0x0200) CRC2(state->check, hold);
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INITBITS();
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}
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else if (state->head != Z_NULL)
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state->head->extra = Z_NULL;
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state->mode = EXTRA;
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case EXTRA:
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if (state->flags & 0x0400) {
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copy = state->length;
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if (copy > have) copy = have;
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if (copy) {
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if (state->head != Z_NULL &&
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state->head->extra != Z_NULL) {
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len = state->head->extra_len - state->length;
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zmemcpy(state->head->extra + len, next,
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len + copy > state->head->extra_max ?
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state->head->extra_max - len : copy);
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}
|
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if (state->flags & 0x0200)
|
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state->check = crc32(state->check, next, copy);
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have -= copy;
|
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next += copy;
|
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state->length -= copy;
|
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}
|
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if (state->length) goto inf_leave;
|
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}
|
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state->length = 0;
|
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state->mode = NAME;
|
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case NAME:
|
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if (state->flags & 0x0800) {
|
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if (have == 0) goto inf_leave;
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copy = 0;
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do {
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len = (unsigned)(next[copy++]);
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if (state->head != Z_NULL &&
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state->head->name != Z_NULL &&
|
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state->length < state->head->name_max)
|
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state->head->name[state->length++] = len;
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} while (len && copy < have);
|
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if (state->flags & 0x0200)
|
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state->check = crc32(state->check, next, copy);
|
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have -= copy;
|
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next += copy;
|
|
if (len) goto inf_leave;
|
|
}
|
|
else if (state->head != Z_NULL)
|
|
state->head->name = Z_NULL;
|
|
state->length = 0;
|
|
state->mode = COMMENT;
|
|
case COMMENT:
|
|
if (state->flags & 0x1000) {
|
|
if (have == 0) goto inf_leave;
|
|
copy = 0;
|
|
do {
|
|
len = (unsigned)(next[copy++]);
|
|
if (state->head != Z_NULL &&
|
|
state->head->comment != Z_NULL &&
|
|
state->length < state->head->comm_max)
|
|
state->head->comment[state->length++] = len;
|
|
} while (len && copy < have);
|
|
if (state->flags & 0x0200)
|
|
state->check = crc32(state->check, next, copy);
|
|
have -= copy;
|
|
next += copy;
|
|
if (len) goto inf_leave;
|
|
}
|
|
else if (state->head != Z_NULL)
|
|
state->head->comment = Z_NULL;
|
|
state->mode = HCRC;
|
|
case HCRC:
|
|
if (state->flags & 0x0200) {
|
|
NEEDBITS(16);
|
|
if (hold != (state->check & 0xffff)) {
|
|
strm->msg = (char *)"header crc mismatch";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
INITBITS();
|
|
}
|
|
if (state->head != Z_NULL) {
|
|
state->head->hcrc = (int)((state->flags >> 9) & 1);
|
|
state->head->done = 1;
|
|
}
|
|
strm->adler = state->check = crc32(0L, Z_NULL, 0);
|
|
state->mode = TYPE;
|
|
break;
|
|
#endif
|
|
case DICTID:
|
|
NEEDBITS(32);
|
|
strm->adler = state->check = REVERSE(hold);
|
|
INITBITS();
|
|
state->mode = DICT;
|
|
case DICT:
|
|
if (state->havedict == 0) {
|
|
RESTORE();
|
|
return Z_NEED_DICT;
|
|
}
|
|
strm->adler = state->check = adler32(0L, Z_NULL, 0);
|
|
state->mode = TYPE;
|
|
case TYPE:
|
|
WATCHDOG_RESET();
|
|
if (flush == Z_BLOCK) goto inf_leave;
|
|
case TYPEDO:
|
|
if (state->last) {
|
|
BYTEBITS();
|
|
state->mode = CHECK;
|
|
break;
|
|
}
|
|
NEEDBITS(3);
|
|
state->last = BITS(1);
|
|
DROPBITS(1);
|
|
switch (BITS(2)) {
|
|
case 0: /* stored block */
|
|
Tracev((stderr, "inflate: stored block%s\n",
|
|
state->last ? " (last)" : ""));
|
|
state->mode = STORED;
|
|
break;
|
|
case 1: /* fixed block */
|
|
fixedtables(state);
|
|
Tracev((stderr, "inflate: fixed codes block%s\n",
|
|
state->last ? " (last)" : ""));
|
|
state->mode = LEN; /* decode codes */
|
|
break;
|
|
case 2: /* dynamic block */
|
|
Tracev((stderr, "inflate: dynamic codes block%s\n",
|
|
state->last ? " (last)" : ""));
|
|
state->mode = TABLE;
|
|
break;
|
|
case 3:
|
|
strm->msg = (char *)"invalid block type";
|
|
state->mode = BAD;
|
|
}
|
|
DROPBITS(2);
|
|
break;
|
|
case STORED:
|
|
BYTEBITS(); /* go to byte boundary */
|
|
NEEDBITS(32);
|
|
if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
|
|
strm->msg = (char *)"invalid stored block lengths";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
state->length = (unsigned)hold & 0xffff;
|
|
Tracev((stderr, "inflate: stored length %u\n",
|
|
state->length));
|
|
INITBITS();
|
|
state->mode = COPY;
|
|
case COPY:
|
|
copy = state->length;
|
|
if (copy) {
|
|
if (copy > have) copy = have;
|
|
if (copy > left) copy = left;
|
|
if (copy == 0) goto inf_leave;
|
|
zmemcpy(put, next, copy);
|
|
have -= copy;
|
|
next += copy;
|
|
left -= copy;
|
|
put += copy;
|
|
state->length -= copy;
|
|
break;
|
|
}
|
|
Tracev((stderr, "inflate: stored end\n"));
|
|
state->mode = TYPE;
|
|
break;
|
|
case TABLE:
|
|
NEEDBITS(14);
|
|
state->nlen = BITS(5) + 257;
|
|
DROPBITS(5);
|
|
state->ndist = BITS(5) + 1;
|
|
DROPBITS(5);
|
|
state->ncode = BITS(4) + 4;
|
|
DROPBITS(4);
|
|
#ifndef PKZIP_BUG_WORKAROUND
|
|
if (state->nlen > 286 || state->ndist > 30) {
|
|
strm->msg = (char *)"too many length or distance symbols";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
#endif
|
|
Tracev((stderr, "inflate: table sizes ok\n"));
|
|
state->have = 0;
|
|
state->mode = LENLENS;
|
|
case LENLENS:
|
|
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;
|
|
state->lencode = (code const FAR *)(state->next);
|
|
state->lenbits = 7;
|
|
ret = inflate_table(CODES, state->lens, 19, &(state->next),
|
|
&(state->lenbits), state->work);
|
|
if (ret) {
|
|
strm->msg = (char *)"invalid code lengths set";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
Tracev((stderr, "inflate: code lengths ok\n"));
|
|
state->have = 0;
|
|
state->mode = CODELENS;
|
|
case CODELENS:
|
|
while (state->have < state->nlen + state->ndist) {
|
|
for (;;) {
|
|
this = state->lencode[BITS(state->lenbits)];
|
|
if ((unsigned)(this.bits) <= bits) break;
|
|
PULLBYTE();
|
|
}
|
|
if (this.val < 16) {
|
|
NEEDBITS(this.bits);
|
|
DROPBITS(this.bits);
|
|
state->lens[state->have++] = this.val;
|
|
}
|
|
else {
|
|
if (this.val == 16) {
|
|
NEEDBITS(this.bits + 2);
|
|
DROPBITS(this.bits);
|
|
if (state->have == 0) {
|
|
strm->msg = (char *)"invalid bit length repeat";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
len = state->lens[state->have - 1];
|
|
copy = 3 + BITS(2);
|
|
DROPBITS(2);
|
|
}
|
|
else if (this.val == 17) {
|
|
NEEDBITS(this.bits + 3);
|
|
DROPBITS(this.bits);
|
|
len = 0;
|
|
copy = 3 + BITS(3);
|
|
DROPBITS(3);
|
|
}
|
|
else {
|
|
NEEDBITS(this.bits + 7);
|
|
DROPBITS(this.bits);
|
|
len = 0;
|
|
copy = 11 + BITS(7);
|
|
DROPBITS(7);
|
|
}
|
|
if (state->have + copy > state->nlen + state->ndist) {
|
|
strm->msg = (char *)"invalid bit length repeat";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
while (copy--)
|
|
state->lens[state->have++] = (unsigned short)len;
|
|
}
|
|
}
|
|
|
|
/* handle error breaks in while */
|
|
if (state->mode == BAD) break;
|
|
|
|
/* build code tables */
|
|
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) {
|
|
strm->msg = (char *)"invalid literal/lengths set";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
state->distcode = (code const FAR *)(state->next);
|
|
state->distbits = 6;
|
|
ret = inflate_table(DISTS, state->lens + state->nlen, state->ndist,
|
|
&(state->next), &(state->distbits), state->work);
|
|
if (ret) {
|
|
strm->msg = (char *)"invalid distances set";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
Tracev((stderr, "inflate: codes ok\n"));
|
|
state->mode = LEN;
|
|
case LEN:
|
|
WATCHDOG_RESET();
|
|
if (have >= 6 && left >= 258) {
|
|
RESTORE();
|
|
inflate_fast(strm, out);
|
|
LOAD();
|
|
break;
|
|
}
|
|
for (;;) {
|
|
this = state->lencode[BITS(state->lenbits)];
|
|
if ((unsigned)(this.bits) <= bits) break;
|
|
PULLBYTE();
|
|
}
|
|
if (this.op && (this.op & 0xf0) == 0) {
|
|
last = this;
|
|
for (;;) {
|
|
this = state->lencode[last.val +
|
|
(BITS(last.bits + last.op) >> last.bits)];
|
|
if ((unsigned)(last.bits + this.bits) <= bits) break;
|
|
PULLBYTE();
|
|
}
|
|
DROPBITS(last.bits);
|
|
}
|
|
DROPBITS(this.bits);
|
|
state->length = (unsigned)this.val;
|
|
if ((int)(this.op) == 0) {
|
|
Tracevv((stderr, this.val >= 0x20 && this.val < 0x7f ?
|
|
"inflate: literal '%c'\n" :
|
|
"inflate: literal 0x%02x\n", this.val));
|
|
state->mode = LIT;
|
|
break;
|
|
}
|
|
if (this.op & 32) {
|
|
Tracevv((stderr, "inflate: end of block\n"));
|
|
state->mode = TYPE;
|
|
break;
|
|
}
|
|
if (this.op & 64) {
|
|
strm->msg = (char *)"invalid literal/length code";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
state->extra = (unsigned)(this.op) & 15;
|
|
state->mode = LENEXT;
|
|
case LENEXT:
|
|
if (state->extra) {
|
|
NEEDBITS(state->extra);
|
|
state->length += BITS(state->extra);
|
|
DROPBITS(state->extra);
|
|
}
|
|
Tracevv((stderr, "inflate: length %u\n", state->length));
|
|
state->mode = DIST;
|
|
case DIST:
|
|
for (;;) {
|
|
this = state->distcode[BITS(state->distbits)];
|
|
if ((unsigned)(this.bits) <= bits) break;
|
|
PULLBYTE();
|
|
}
|
|
if ((this.op & 0xf0) == 0) {
|
|
last = this;
|
|
for (;;) {
|
|
this = state->distcode[last.val +
|
|
(BITS(last.bits + last.op) >> last.bits)];
|
|
if ((unsigned)(last.bits + this.bits) <= bits) break;
|
|
PULLBYTE();
|
|
}
|
|
DROPBITS(last.bits);
|
|
}
|
|
DROPBITS(this.bits);
|
|
if (this.op & 64) {
|
|
strm->msg = (char *)"invalid distance code";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
state->offset = (unsigned)this.val;
|
|
state->extra = (unsigned)(this.op) & 15;
|
|
state->mode = DISTEXT;
|
|
case DISTEXT:
|
|
if (state->extra) {
|
|
NEEDBITS(state->extra);
|
|
state->offset += BITS(state->extra);
|
|
DROPBITS(state->extra);
|
|
}
|
|
#ifdef INFLATE_STRICT
|
|
if (state->offset > state->dmax) {
|
|
strm->msg = (char *)"invalid distance too far back";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
#endif
|
|
if (state->offset > state->whave + out - left) {
|
|
strm->msg = (char *)"invalid distance too far back";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
Tracevv((stderr, "inflate: distance %u\n", state->offset));
|
|
state->mode = MATCH;
|
|
case MATCH:
|
|
if (left == 0) goto inf_leave;
|
|
copy = out - left;
|
|
if (state->offset > copy) { /* copy from window */
|
|
copy = state->offset - copy;
|
|
if (copy > state->write) {
|
|
copy -= state->write;
|
|
from = state->window + (state->wsize - copy);
|
|
}
|
|
else
|
|
from = state->window + (state->write - copy);
|
|
if (copy > state->length) copy = state->length;
|
|
}
|
|
else { /* copy from output */
|
|
from = put - state->offset;
|
|
copy = state->length;
|
|
}
|
|
if (copy > left) copy = left;
|
|
left -= copy;
|
|
state->length -= copy;
|
|
do {
|
|
*put++ = *from++;
|
|
} while (--copy);
|
|
if (state->length == 0) state->mode = LEN;
|
|
break;
|
|
case LIT:
|
|
if (left == 0) goto inf_leave;
|
|
*put++ = (unsigned char)(state->length);
|
|
left--;
|
|
state->mode = LEN;
|
|
break;
|
|
case CHECK:
|
|
if (state->wrap) {
|
|
NEEDBITS(32);
|
|
out -= left;
|
|
strm->total_out += out;
|
|
state->total += out;
|
|
if (out)
|
|
strm->adler = state->check =
|
|
UPDATE(state->check, put - out, out);
|
|
out = left;
|
|
if ((
|
|
#ifdef GUNZIP
|
|
state->flags ? hold :
|
|
#endif
|
|
REVERSE(hold)) != state->check) {
|
|
strm->msg = (char *)"incorrect data check";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
INITBITS();
|
|
Tracev((stderr, "inflate: check matches trailer\n"));
|
|
}
|
|
#ifdef GUNZIP
|
|
state->mode = LENGTH;
|
|
case LENGTH:
|
|
if (state->wrap && state->flags) {
|
|
NEEDBITS(32);
|
|
if (hold != (state->total & 0xffffffffUL)) {
|
|
strm->msg = (char *)"incorrect length check";
|
|
state->mode = BAD;
|
|
break;
|
|
}
|
|
INITBITS();
|
|
Tracev((stderr, "inflate: length matches trailer\n"));
|
|
}
|
|
#endif
|
|
state->mode = DONE;
|
|
case DONE:
|
|
ret = Z_STREAM_END;
|
|
goto inf_leave;
|
|
case BAD:
|
|
ret = Z_DATA_ERROR;
|
|
goto inf_leave;
|
|
case MEM:
|
|
return Z_MEM_ERROR;
|
|
case SYNC:
|
|
default:
|
|
return Z_STREAM_ERROR;
|
|
}
|
|
|
|
/*
|
|
Return from inflate(), updating the total counts and the check value.
|
|
If there was no progress during the inflate() call, return a buffer
|
|
error. Call updatewindow() to create and/or update the window state.
|
|
Note: a memory error from inflate() is non-recoverable.
|
|
*/
|
|
inf_leave:
|
|
RESTORE();
|
|
if (state->wsize || (state->mode < CHECK && out != strm->avail_out))
|
|
if (updatewindow(strm, out)) {
|
|
state->mode = MEM;
|
|
return Z_MEM_ERROR;
|
|
}
|
|
in -= strm->avail_in;
|
|
out -= strm->avail_out;
|
|
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);
|
|
strm->data_type = state->bits + (state->last ? 64 : 0) +
|
|
(state->mode == TYPE ? 128 : 0);
|
|
if (((in == 0 && out == 0) || flush == Z_FINISH) && ret == Z_OK)
|
|
ret = Z_BUF_ERROR;
|
|
return ret;
|
|
}
|
|
|
|
int ZEXPORT inflateEnd(z_streamp strm)
|
|
{
|
|
struct inflate_state FAR *state;
|
|
if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
|
|
return Z_STREAM_ERROR;
|
|
state = (struct inflate_state FAR *)strm->state;
|
|
if (state->window != Z_NULL) {
|
|
WATCHDOG_RESET();
|
|
ZFREE(strm, state->window);
|
|
}
|
|
ZFREE(strm, strm->state);
|
|
strm->state = Z_NULL;
|
|
Tracev((stderr, "inflate: end\n"));
|
|
return Z_OK;
|
|
}
|