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