-/* inflate.c -- zlib decompression
- * Copyright (C) 1995-2005 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- *
- * Based on zlib 1.2.3 but modified for the Linux Kernel by
- * Richard Purdie <richard@openedhand.com>
- *
- * Changes mainly for static instead of dynamic memory allocation
- *
+/* inflate.c -- zlib interface to inflate modules
+ * Copyright (C) 1995-1998 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
*/
#include <linux/zutil.h>
-#include "inftrees.h"
-#include "inflate.h"
-#include "inffast.h"
+#include "infblock.h"
#include "infutil.h"
int zlib_inflate_workspacesize(void)
{
- return sizeof(struct inflate_workspace);
+ return sizeof(struct inflate_workspace);
}
-int zlib_inflateReset(z_streamp strm)
-{
- struct inflate_state *state;
-
- if (strm == NULL || strm->state == NULL) return Z_STREAM_ERROR;
- state = (struct inflate_state *)strm->state;
- strm->total_in = strm->total_out = state->total = 0;
- strm->msg = NULL;
- strm->adler = 1; /* to support ill-conceived Java test suite */
- state->mode = HEAD;
- state->last = 0;
- state->havedict = 0;
- state->dmax = 32768U;
- state->hold = 0;
- state->bits = 0;
- state->lencode = state->distcode = state->next = state->codes;
- /* Initialise Window */
- state->wsize = 1U << state->wbits;
- state->write = 0;
- state->whave = 0;
-
- return Z_OK;
-}
-
-#if 0
-int zlib_inflatePrime(z_streamp strm, int bits, int value)
+int zlib_inflateReset(
+ z_streamp z
+)
{
- struct inflate_state *state;
-
- if (strm == NULL || strm->state == NULL) return Z_STREAM_ERROR;
- state = (struct inflate_state *)strm->state;
- if (bits > 16 || state->bits + bits > 32) return Z_STREAM_ERROR;
- value &= (1L << bits) - 1;
- state->hold += value << state->bits;
- state->bits += bits;
- return Z_OK;
+ if (z == NULL || z->state == NULL || z->workspace == NULL)
+ return Z_STREAM_ERROR;
+ z->total_in = z->total_out = 0;
+ z->msg = NULL;
+ z->state->mode = z->state->nowrap ? BLOCKS : METHOD;
+ zlib_inflate_blocks_reset(z->state->blocks, z, NULL);
+ return Z_OK;
}
-#endif
-
-int zlib_inflateInit2(z_streamp strm, int windowBits)
-{
- struct inflate_state *state;
-
- if (strm == NULL) return Z_STREAM_ERROR;
- strm->msg = NULL; /* in case we return an error */
-
- state = &WS(strm)->inflate_state;
- strm->state = (struct internal_state *)state;
-
- if (windowBits < 0) {
- state->wrap = 0;
- windowBits = -windowBits;
- }
- else {
- state->wrap = (windowBits >> 4) + 1;
- }
- if (windowBits < 8 || windowBits > 15) {
- return Z_STREAM_ERROR;
- }
- state->wbits = (unsigned)windowBits;
- state->window = &WS(strm)->working_window[0];
- return zlib_inflateReset(strm);
-}
-/*
- Return state with length and distance decoding tables and index sizes set to
- fixed code decoding. This returns fixed tables from inffixed.h.
- */
-static void zlib_fixedtables(struct inflate_state *state)
+int zlib_inflateEnd(
+ z_streamp z
+)
{
-# include "inffixed.h"
- state->lencode = lenfix;
- state->lenbits = 9;
- state->distcode = distfix;
- state->distbits = 5;
+ if (z == NULL || z->state == NULL || z->workspace == NULL)
+ return Z_STREAM_ERROR;
+ if (z->state->blocks != NULL)
+ zlib_inflate_blocks_free(z->state->blocks, z);
+ z->state = NULL;
+ return Z_OK;
}
-/*
- Update the window with the last wsize (normally 32K) bytes written before
- returning. This is only called when a window is already in use, or when
- output has been written during this inflate call, but the end of the deflate
- stream has not been reached yet. It is also called to window dictionary data
- when a dictionary is loaded.
-
- Providing output buffers larger than 32K to inflate() should provide a speed
- advantage, since only the last 32K of output is copied to the sliding window
- upon return from inflate(), and since all distances after the first 32K of
- output will fall in the output data, making match copies simpler and faster.
- The advantage may be dependent on the size of the processor's data caches.
- */
-static void zlib_updatewindow(z_streamp strm, unsigned out)
+int zlib_inflateInit2_(
+ z_streamp z,
+ int w,
+ const char *version,
+ int stream_size
+)
{
- struct inflate_state *state;
- unsigned copy, dist;
-
- state = (struct inflate_state *)strm->state;
-
- /* copy state->wsize or less output bytes into the circular window */
- copy = out - strm->avail_out;
- if (copy >= state->wsize) {
- memcpy(state->window, strm->next_out - state->wsize, state->wsize);
- state->write = 0;
- state->whave = state->wsize;
- }
- else {
- dist = state->wsize - state->write;
- if (dist > copy) dist = copy;
- memcpy(state->window + state->write, strm->next_out - copy, dist);
- copy -= dist;
- if (copy) {
- memcpy(state->window, strm->next_out - copy, copy);
- state->write = copy;
- state->whave = state->wsize;
- }
- else {
- state->write += dist;
- if (state->write == state->wsize) state->write = 0;
- if (state->whave < state->wsize) state->whave += dist;
- }
- }
+ if (version == NULL || version[0] != ZLIB_VERSION[0] ||
+ stream_size != sizeof(z_stream) || z->workspace == NULL)
+ return Z_VERSION_ERROR;
+
+ /* initialize state */
+ z->msg = NULL;
+ z->state = &WS(z)->internal_state;
+ z->state->blocks = NULL;
+
+ /* handle undocumented nowrap option (no zlib header or check) */
+ z->state->nowrap = 0;
+ if (w < 0)
+ {
+ w = - w;
+ z->state->nowrap = 1;
+ }
+
+ /* set window size */
+ if (w < 8 || w > 15)
+ {
+ zlib_inflateEnd(z);
+ return Z_STREAM_ERROR;
+ }
+ z->state->wbits = (uInt)w;
+
+ /* create inflate_blocks state */
+ if ((z->state->blocks =
+ zlib_inflate_blocks_new(z, z->state->nowrap ? NULL : zlib_adler32, (uInt)1 << w))
+ == NULL)
+ {
+ zlib_inflateEnd(z);
+ return Z_MEM_ERROR;
+ }
+
+ /* reset state */
+ zlib_inflateReset(z);
+ return Z_OK;
}
* At the end of a Deflate-compressed PPP packet, we expect to have seen
* a `stored' block type value but not the (zero) length bytes.
*/
-/*
- Returns true if inflate is currently at the end of a block generated by
- Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
- implementation to provide an additional safety check. PPP uses
- Z_SYNC_FLUSH but removes the length bytes of the resulting empty stored
- block. When decompressing, PPP checks that at the end of input packet,
- inflate is waiting for these length bytes.
- */
-static int zlib_inflateSyncPacket(z_streamp strm)
+static int zlib_inflate_packet_flush(inflate_blocks_statef *s)
{
- struct inflate_state *state;
-
- if (strm == NULL || strm->state == NULL) return Z_STREAM_ERROR;
- state = (struct inflate_state *)strm->state;
-
- if (state->mode == STORED && state->bits == 0) {
- state->mode = TYPE;
- return Z_OK;
- }
- return Z_DATA_ERROR;
-}
-
-/* Macros for inflate(): */
-
-/* check function to use adler32() for zlib or crc32() for gzip */
-#define UPDATE(check, buf, len) zlib_adler32(check, buf, len)
-
-/* Load registers with state in inflate() for speed */
-#define LOAD() \
- do { \
- put = strm->next_out; \
- left = strm->avail_out; \
- next = strm->next_in; \
- have = strm->avail_in; \
- hold = state->hold; \
- bits = state->bits; \
- } while (0)
-
-/* Restore state from registers in inflate() */
-#define RESTORE() \
- do { \
- strm->next_out = put; \
- strm->avail_out = left; \
- strm->next_in = next; \
- strm->avail_in = have; \
- state->hold = hold; \
- state->bits = bits; \
- } while (0)
-
-/* Clear the input bit accumulator */
-#define INITBITS() \
- do { \
- hold = 0; \
- bits = 0; \
- } while (0)
-
-/* Get a byte of input into the bit accumulator, or return from inflate()
- if there is no input available. */
-#define PULLBYTE() \
- do { \
- if (have == 0) goto inf_leave; \
- 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 inflate(). */
-#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)
-
-/* Reverse the bytes in a 32-bit value */
-#define REVERSE(q) \
- ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
- (((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
-
-/*
- inflate() uses a state machine to process as much input data and generate as
- much output data as possible before returning. The state machine is
- structured roughly as follows:
-
- for (;;) switch (state) {
- ...
- case STATEn:
- if (not enough input data or output space to make progress)
- return;
- ... make progress ...
- state = STATEm;
- break;
- ...
- }
-
- so when inflate() is called again, the same case is attempted again, and
- if the appropriate resources are provided, the machine proceeds to the
- next state. The NEEDBITS() macro is usually the way the state evaluates
- whether it can proceed or should return. NEEDBITS() does the return if
- the requested bits are not available. The typical use of the BITS macros
- is:
-
- NEEDBITS(n);
- ... do something with BITS(n) ...
- DROPBITS(n);
-
- where NEEDBITS(n) either returns from inflate() if there isn't enough
- input left to load n bits into the accumulator, or it continues. BITS(n)
- gives the low n bits in the accumulator. When done, DROPBITS(n) drops
- the low n bits off the accumulator. INITBITS() clears the accumulator
- and sets the number of available bits to zero. BYTEBITS() discards just
- enough bits to put the accumulator on a byte boundary. After BYTEBITS()
- and a NEEDBITS(8), then BITS(8) would return the next byte in the stream.
-
- NEEDBITS(n) uses PULLBYTE() to get an available byte of input, or to return
- if there is no input available. The decoding of variable length codes uses
- PULLBYTE() directly in order to pull just enough bytes to decode the next
- code, and no more.
-
- Some states loop until they get enough input, making sure that enough
- state information is maintained to continue the loop where it left off
- if NEEDBITS() returns in the loop. For example, want, need, and keep
- would all have to actually be part of the saved state in case NEEDBITS()
- returns:
-
- case STATEw:
- while (want < need) {
- NEEDBITS(n);
- keep[want++] = BITS(n);
- DROPBITS(n);
- }
- state = STATEx;
- case STATEx:
-
- As shown above, if the next state is also the next case, then the break
- is omitted.
-
- A state may also return if there is not enough output space available to
- complete that state. Those states are copying stored data, writing a
- literal byte, and copying a matching string.
-
- When returning, a "goto inf_leave" is used to update the total counters,
- update the check value, and determine whether any progress has been made
- during that inflate() call in order to return the proper return code.
- Progress is defined as a change in either strm->avail_in or strm->avail_out.
- When there is a window, goto inf_leave will update the window with the last
- output written. If a goto inf_leave occurs in the middle of decompression
- and there is no window currently, goto inf_leave will create one and copy
- output to the window for the next call of inflate().
-
- In this implementation, the flush parameter of inflate() only affects the
- return code (per zlib.h). inflate() always writes as much as possible to
- strm->next_out, given the space available and the provided input--the effect
- documented in zlib.h of Z_SYNC_FLUSH. Furthermore, inflate() always defers
- the allocation of and copying into a sliding window until necessary, which
- provides the effect documented in zlib.h for Z_FINISH when the entire input
- stream available. So the only thing the flush parameter actually does is:
- when flush is set to Z_FINISH, inflate() cannot return Z_OK. Instead it
- will return Z_BUF_ERROR if it has not reached the end of the stream.
- */
-
-int zlib_inflate(z_streamp strm, int flush)
-{
- struct inflate_state *state;
- unsigned char *next; /* next input */
- unsigned char *put; /* next output */
- unsigned have, left; /* available input and output */
- unsigned long hold; /* bit buffer */
- unsigned bits; /* bits in bit buffer */
- unsigned in, out; /* save starting available input and output */
- unsigned copy; /* number of stored or match bytes to copy */
- unsigned char *from; /* where to copy match bytes from */
- code this; /* 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};
-
- /* Do not check for strm->next_out == NULL here as ppc zImage
- inflates to strm->next_out = 0 */
-
- if (strm == NULL || strm->state == NULL ||
- (strm->next_in == NULL && strm->avail_in != 0))
- return Z_STREAM_ERROR;
-
- state = (struct inflate_state *)strm->state;
-
- if (state->mode == TYPE) state->mode = TYPEDO; /* skip check */
- LOAD();
- in = have;
- out = left;
- ret = Z_OK;
- for (;;)
- switch (state->mode) {
- case HEAD:
- if (state->wrap == 0) {
- state->mode = TYPEDO;
- break;
- }
- NEEDBITS(16);
- if (
- ((BITS(8) << 8) + (hold >> 8)) % 31) {
- strm->msg = (char *)"incorrect header check";
- state->mode = BAD;
- break;
- }
- if (BITS(4) != Z_DEFLATED) {
- strm->msg = (char *)"unknown compression method";
- state->mode = BAD;
- break;
- }
- DROPBITS(4);
- len = BITS(4) + 8;
- if (len > state->wbits) {
- strm->msg = (char *)"invalid window size";
- state->mode = BAD;
- break;
- }
- state->dmax = 1U << len;
- strm->adler = state->check = zlib_adler32(0L, NULL, 0);
- state->mode = hold & 0x200 ? DICTID : TYPE;
- INITBITS();
- break;
- 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 = zlib_adler32(0L, NULL, 0);
- state->mode = TYPE;
- case TYPE:
- 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 */
- state->mode = STORED;
- break;
- case 1: /* fixed block */
- zlib_fixedtables(state);
- state->mode = LEN; /* decode codes */
- break;
- case 2: /* dynamic block */
- 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;
- 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;
- memcpy(put, next, copy);
- have -= copy;
- next += copy;
- left -= copy;
- put += copy;
- state->length -= copy;
- break;
- }
- 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
- 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 *)(state->next);
- state->lenbits = 7;
- ret = zlib_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;
- }
- 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 *)(state->next);
- state->lenbits = 9;
- ret = zlib_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 *)(state->next);
- state->distbits = 6;
- ret = zlib_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;
- }
- state->mode = LEN;
- case LEN:
- 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) {
- state->mode = LIT;
- break;
- }
- if (this.op & 32) {
- 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);
- }
- 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;
- }
- 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 ((
- REVERSE(hold)) != state->check) {
- strm->msg = (char *)"incorrect data check";
- state->mode = BAD;
- break;
- }
- INITBITS();
- }
- 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 zlib_updatewindow() to create and/or update the window state.
- */
- inf_leave:
- RESTORE();
- if (state->wsize || (state->mode < CHECK && out != strm->avail_out))
- zlib_updatewindow(strm, out);
-
- 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;
-
- if (flush == Z_PACKET_FLUSH && ret == Z_OK &&
- (strm->avail_out != 0 || strm->avail_in == 0))
- return zlib_inflateSyncPacket(strm);
- return ret;
-}
-
-int zlib_inflateEnd(z_streamp strm)
-{
- if (strm == NULL || strm->state == NULL)
- return Z_STREAM_ERROR;
+ if (s->mode != LENS)
+ return Z_DATA_ERROR;
+ s->mode = TYPE;
return Z_OK;
}
-#if 0
-int zlib_inflateSetDictionary(z_streamp strm, const Byte *dictionary,
- uInt dictLength)
-{
- struct inflate_state *state;
- unsigned long id;
-
- /* check state */
- if (strm == NULL || strm->state == NULL) return Z_STREAM_ERROR;
- state = (struct inflate_state *)strm->state;
- if (state->wrap != 0 && state->mode != DICT)
- return Z_STREAM_ERROR;
-
- /* check for correct dictionary id */
- if (state->mode == DICT) {
- id = zlib_adler32(0L, NULL, 0);
- id = zlib_adler32(id, dictionary, dictLength);
- if (id != state->check)
- return Z_DATA_ERROR;
- }
-
- /* copy dictionary to window */
- zlib_updatewindow(strm, strm->avail_out);
- if (dictLength > state->wsize) {
- memcpy(state->window, dictionary + dictLength - state->wsize,
- state->wsize);
- state->whave = state->wsize;
- }
- else {
- memcpy(state->window + state->wsize - dictLength, dictionary,
- dictLength);
- state->whave = dictLength;
- }
- state->havedict = 1;
- return Z_OK;
-}
-#endif
-
-#if 0
-/*
- Search buf[0..len-1] for the pattern: 0, 0, 0xff, 0xff. Return when found
- or when out of input. When called, *have is the number of pattern bytes
- found in order so far, in 0..3. On return *have is updated to the new
- state. If on return *have equals four, then the pattern was found and the
- return value is how many bytes were read including the last byte of the
- pattern. If *have is less than four, then the pattern has not been found
- yet and the return value is len. In the latter case, zlib_syncsearch() can be
- called again with more data and the *have state. *have is initialized to
- zero for the first call.
- */
-static unsigned zlib_syncsearch(unsigned *have, unsigned char *buf,
- unsigned len)
+int zlib_inflateInit_(
+ z_streamp z,
+ const char *version,
+ int stream_size
+)
{
- unsigned got;
- unsigned next;
-
- got = *have;
- next = 0;
- while (next < len && got < 4) {
- if ((int)(buf[next]) == (got < 2 ? 0 : 0xff))
- got++;
- else if (buf[next])
- got = 0;
- else
- got = 4 - got;
- next++;
- }
- *have = got;
- return next;
+ return zlib_inflateInit2_(z, DEF_WBITS, version, stream_size);
}
-#endif
-#if 0
-int zlib_inflateSync(z_streamp strm)
-{
- unsigned len; /* number of bytes to look at or looked at */
- unsigned long in, out; /* temporary to save total_in and total_out */
- unsigned char buf[4]; /* to restore bit buffer to byte string */
- struct inflate_state *state;
-
- /* check parameters */
- if (strm == NULL || strm->state == NULL) return Z_STREAM_ERROR;
- state = (struct inflate_state *)strm->state;
- if (strm->avail_in == 0 && state->bits < 8) return Z_BUF_ERROR;
-
- /* if first time, start search in bit buffer */
- if (state->mode != SYNC) {
- state->mode = SYNC;
- state->hold <<= state->bits & 7;
- state->bits -= state->bits & 7;
- len = 0;
- while (state->bits >= 8) {
- buf[len++] = (unsigned char)(state->hold);
- state->hold >>= 8;
- state->bits -= 8;
- }
- state->have = 0;
- zlib_syncsearch(&(state->have), buf, len);
- }
-
- /* search available input */
- len = zlib_syncsearch(&(state->have), strm->next_in, strm->avail_in);
- strm->avail_in -= len;
- strm->next_in += len;
- strm->total_in += len;
-
- /* return no joy or set up to restart inflate() on a new block */
- if (state->have != 4) return Z_DATA_ERROR;
- in = strm->total_in; out = strm->total_out;
- zlib_inflateReset(strm);
- strm->total_in = in; strm->total_out = out;
- state->mode = TYPE;
- return Z_OK;
-}
-#endif
+#undef NEEDBYTE
+#undef NEXTBYTE
+#define NEEDBYTE {if(z->avail_in==0)goto empty;r=trv;}
+#define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
-/*
- * This subroutine adds the data at next_in/avail_in to the output history
- * without performing any output. The output buffer must be "caught up";
- * i.e. no pending output but this should always be the case. The state must
- * be waiting on the start of a block (i.e. mode == TYPE or HEAD). On exit,
- * the output will also be caught up, and the checksum will have been updated
- * if need be.
- */
-int zlib_inflateIncomp(z_stream *z)
+int zlib_inflate(
+ z_streamp z,
+ int f
+)
{
- struct inflate_state *state = (struct inflate_state *)z->state;
- Byte *saved_no = z->next_out;
- uInt saved_ao = z->avail_out;
-
- if (state->mode != TYPE && state->mode != HEAD)
- return Z_DATA_ERROR;
-
- /* Setup some variables to allow misuse of updateWindow */
- z->avail_out = 0;
- z->next_out = z->next_in + z->avail_in;
-
- zlib_updatewindow(z, z->avail_in);
-
- /* Restore saved variables */
- z->avail_out = saved_ao;
- z->next_out = saved_no;
-
- z->adler = state->check =
- UPDATE(state->check, z->next_in, z->avail_in);
-
- z->total_out += z->avail_in;
- z->total_in += z->avail_in;
- z->next_in += z->avail_in;
- state->total += z->avail_in;
- z->avail_in = 0;
-
- return Z_OK;
+ int r, trv;
+ uInt b;
+
+ if (z == NULL || z->state == NULL || z->next_in == NULL)
+ return Z_STREAM_ERROR;
+ trv = f == Z_FINISH ? Z_BUF_ERROR : Z_OK;
+ r = Z_BUF_ERROR;
+ while (1) switch (z->state->mode)
+ {
+ case METHOD:
+ NEEDBYTE
+ if (((z->state->sub.method = NEXTBYTE) & 0xf) != Z_DEFLATED)
+ {
+ z->state->mode = I_BAD;
+ z->msg = (char*)"unknown compression method";
+ z->state->sub.marker = 5; /* can't try inflateSync */
+ break;
+ }
+ if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
+ {
+ z->state->mode = I_BAD;
+ z->msg = (char*)"invalid window size";
+ z->state->sub.marker = 5; /* can't try inflateSync */
+ break;
+ }
+ z->state->mode = FLAG;
+ case FLAG:
+ NEEDBYTE
+ b = NEXTBYTE;
+ if (((z->state->sub.method << 8) + b) % 31)
+ {
+ z->state->mode = I_BAD;
+ z->msg = (char*)"incorrect header check";
+ z->state->sub.marker = 5; /* can't try inflateSync */
+ break;
+ }
+ if (!(b & PRESET_DICT))
+ {
+ z->state->mode = BLOCKS;
+ break;
+ }
+ z->state->mode = DICT4;
+ case DICT4:
+ NEEDBYTE
+ z->state->sub.check.need = (uLong)NEXTBYTE << 24;
+ z->state->mode = DICT3;
+ case DICT3:
+ NEEDBYTE
+ z->state->sub.check.need += (uLong)NEXTBYTE << 16;
+ z->state->mode = DICT2;
+ case DICT2:
+ NEEDBYTE
+ z->state->sub.check.need += (uLong)NEXTBYTE << 8;
+ z->state->mode = DICT1;
+ case DICT1:
+ NEEDBYTE
+ z->state->sub.check.need += (uLong)NEXTBYTE;
+ z->adler = z->state->sub.check.need;
+ z->state->mode = DICT0;
+ return Z_NEED_DICT;
+ case DICT0:
+ z->state->mode = I_BAD;
+ z->msg = (char*)"need dictionary";
+ z->state->sub.marker = 0; /* can try inflateSync */
+ return Z_STREAM_ERROR;
+ case BLOCKS:
+ r = zlib_inflate_blocks(z->state->blocks, z, r);
+ if (f == Z_PACKET_FLUSH && z->avail_in == 0 && z->avail_out != 0)
+ r = zlib_inflate_packet_flush(z->state->blocks);
+ if (r == Z_DATA_ERROR)
+ {
+ z->state->mode = I_BAD;
+ z->state->sub.marker = 0; /* can try inflateSync */
+ break;
+ }
+ if (r == Z_OK)
+ r = trv;
+ if (r != Z_STREAM_END)
+ return r;
+ r = trv;
+ zlib_inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was);
+ if (z->state->nowrap)
+ {
+ z->state->mode = I_DONE;
+ break;
+ }
+ z->state->mode = CHECK4;
+ case CHECK4:
+ NEEDBYTE
+ z->state->sub.check.need = (uLong)NEXTBYTE << 24;
+ z->state->mode = CHECK3;
+ case CHECK3:
+ NEEDBYTE
+ z->state->sub.check.need += (uLong)NEXTBYTE << 16;
+ z->state->mode = CHECK2;
+ case CHECK2:
+ NEEDBYTE
+ z->state->sub.check.need += (uLong)NEXTBYTE << 8;
+ z->state->mode = CHECK1;
+ case CHECK1:
+ NEEDBYTE
+ z->state->sub.check.need += (uLong)NEXTBYTE;
+
+ if (z->state->sub.check.was != z->state->sub.check.need)
+ {
+ z->state->mode = I_BAD;
+ z->msg = (char*)"incorrect data check";
+ z->state->sub.marker = 5; /* can't try inflateSync */
+ break;
+ }
+ z->state->mode = I_DONE;
+ case I_DONE:
+ return Z_STREAM_END;
+ case I_BAD:
+ return Z_DATA_ERROR;
+ default:
+ return Z_STREAM_ERROR;
+ }
+ empty:
+ if (f != Z_PACKET_FLUSH)
+ return r;
+ z->state->mode = I_BAD;
+ z->msg = (char *)"need more for packet flush";
+ z->state->sub.marker = 0; /* can try inflateSync */
+ return Z_DATA_ERROR;
}
git://git.onelab.eu / linux-2.6.git / blobdiff