diff options
Diffstat (limited to 'neozip/infback.c')
| -rw-r--r-- | neozip/infback.c | 524 |
1 files changed, 524 insertions, 0 deletions
diff --git a/neozip/infback.c b/neozip/infback.c new file mode 100644 index 0000000000..2dc15458d5 --- /dev/null +++ b/neozip/infback.c @@ -0,0 +1,524 @@ +/* infback.c -- inflate using a call-back interface + * Copyright (C) 1995-2022 Mark Adler + * For conditions of distribution and use, see copyright notice in zlib.h + */ + +/* + This code is largely copied from inflate.c. Normally either infback.o or + inflate.o would be linked into an application--not both. The interface + with inffast.c is retained so that optimized assembler-coded versions of + inflate_fast() can be used with either inflate.c or infback.c. + */ + +#include "zbuild.h" +#include "zutil.h" +#include "inftrees.h" +#include "inflate.h" +#include "inflate_p.h" +#include "functable.h" + +/* Avoid conflicts with zlib.h macros */ +#ifdef ZLIB_COMPAT +# undef inflateBackInit +#endif + +/* + strm provides memory allocation functions in zalloc and zfree, or + NULL to use the library memory allocation functions. + + windowBits is in the range 8..15, and window is a user-supplied + window and output buffer that is 2**windowBits bytes. + + This function is hidden in ZLIB_COMPAT builds. + */ +int32_t ZNG_CONDEXPORT PREFIX(inflateBackInit)(PREFIX3(stream) *strm, int32_t windowBits, uint8_t *window) { + struct inflate_state *state; + + if (strm == NULL || window == NULL || windowBits < MIN_WBITS || windowBits > MAX_WBITS) + return Z_STREAM_ERROR; + strm->msg = NULL; /* in case we return an error */ + if (strm->zalloc == NULL) { + strm->zalloc = PREFIX(zcalloc); + strm->opaque = NULL; + } + if (strm->zfree == NULL) + strm->zfree = PREFIX(zcfree); + + inflate_allocs *alloc_bufs = alloc_inflate(strm); + if (alloc_bufs == NULL) + return Z_MEM_ERROR; + + state = alloc_bufs->state; + state->alloc_bufs = alloc_bufs; + Tracev((stderr, "inflate: allocated\n")); + + strm->state = (struct internal_state *)state; + state->wbits = (unsigned int)windowBits; + state->wsize = 1U << windowBits; + state->wbufsize = 1U << windowBits; + state->window = window; + state->wnext = 0; + state->whave = 0; +#ifdef INFLATE_STRICT + state->dmax = 32768U; +#endif +#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR + state->sane = 1; +#endif + return Z_OK; +} + +/* Function used by zlib.h and zlib-ng version 2.0 macros */ +int32_t Z_EXPORT PREFIX(inflateBackInit_)(PREFIX3(stream) *strm, int32_t windowBits, uint8_t *window, + const char *version, int32_t stream_size) { + if (CHECK_VER_STSIZE(version, stream_size)) + return Z_VERSION_ERROR; + return PREFIX(inflateBackInit)(strm, windowBits, window); +} + +/* + Private macros for inflateBack() + Look in inflate_p.h for macros shared with inflate() +*/ + +/* Assure that some input is available. If input is requested, but denied, + then return a Z_BUF_ERROR from inflateBack(). */ +#define PULL() \ + do { \ + if (have == 0) { \ + have = in(in_desc, &next); \ + if (have == 0) { \ + next = NULL; \ + ret = Z_BUF_ERROR; \ + goto inf_leave; \ + } \ + } \ + } while (0) + +/* Get a byte of input into the bit accumulator, or return from inflateBack() + with an error if there is no input available. */ +#define PULLBYTE() \ + do { \ + PULL(); \ + have--; \ + hold += ((uint64_t)(*next++) << bits); \ + bits += 8; \ + } while (0) + +/* Assure that some output space is available, by writing out the window + if it's full. If the write fails, return from inflateBack() with a + Z_BUF_ERROR. */ +#define ROOM() \ + do { \ + if (left == 0) { \ + put = state->window; \ + left = state->wsize; \ + state->whave = left; \ + if (out(out_desc, put, left)) { \ + ret = Z_BUF_ERROR; \ + goto inf_leave; \ + } \ + } \ + } while (0) + +/* + strm provides the memory allocation functions and window buffer on input, + and provides information on the unused input on return. For Z_DATA_ERROR + returns, strm will also provide an error message. + + in() and out() are the call-back input and output functions. When + inflateBack() needs more input, it calls in(). When inflateBack() has + filled the window with output, or when it completes with data in the + window, it calls out() to write out the data. The application must not + change the provided input until in() is called again or inflateBack() + returns. The application must not change the window/output buffer until + inflateBack() returns. + + in() and out() are called with a descriptor parameter provided in the + inflateBack() call. This parameter can be a structure that provides the + information required to do the read or write, as well as accumulated + information on the input and output such as totals and check values. + + in() should return zero on failure. out() should return non-zero on + failure. If either in() or out() fails, than inflateBack() returns a + Z_BUF_ERROR. strm->next_in can be checked for NULL to see whether it + was in() or out() that caused in the error. Otherwise, inflateBack() + returns Z_STREAM_END on success, Z_DATA_ERROR for an deflate format + error, or Z_MEM_ERROR if it could not allocate memory for the state. + inflateBack() can also return Z_STREAM_ERROR if the input parameters + are not correct, i.e. strm is NULL or the state was not initialized. + */ +int32_t Z_EXPORT PREFIX(inflateBack)(PREFIX3(stream) *strm, in_func in, void *in_desc, out_func out, void *out_desc) { + struct inflate_state *state; + z_const unsigned char *next; /* next input */ + unsigned char *put; /* next output */ + unsigned have, left; /* available input and output */ + uint64_t hold; /* bit buffer */ + bits_t bits; /* bits in bit buffer */ + unsigned copy; /* number of stored or match bytes to copy */ + unsigned char *from; /* where to copy match bytes from */ + code here; /* current decoding table entry */ + code last; /* parent table entry */ + unsigned len; /* length to copy for repeats, bits to drop */ + int32_t ret; /* return code */ + static const uint16_t 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}; + + /* Check that the strm exists and that the state was initialized */ + if (strm == NULL || strm->state == NULL) + return Z_STREAM_ERROR; + state = (struct inflate_state *)strm->state; + + /* Reset the state */ + strm->msg = NULL; + state->mode = TYPE; + state->last = 0; + state->whave = 0; + next = strm->next_in; + have = next != NULL ? strm->avail_in : 0; + hold = 0; + bits = 0; + put = state->window; + left = state->wsize; + + /* Inflate until end of block marked as last */ + for (;;) + switch (state->mode) { + case TYPE: + /* determine and dispatch block type */ + if (state->last) { + BYTEBITS(); + state->mode = DONE; + 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 */ + PREFIX(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: + SET_BAD("invalid block type"); + } + DROPBITS(2); + break; + + case STORED: + /* get and verify stored block length */ + BYTEBITS(); /* go to byte boundary */ + NEEDBITS(32); + if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) { + SET_BAD("invalid stored block lengths"); + break; + } + state->length = (uint16_t)hold; + Tracev((stderr, "inflate: stored length %u\n", state->length)); + INITBITS(); + + /* copy stored block from input to output */ + while (state->length != 0) { + copy = state->length; + PULL(); + ROOM(); + copy = MIN(copy, have); + copy = MIN(copy, left); + memcpy(put, next, copy); + have -= copy; + next += copy; + left -= copy; + put += copy; + state->length -= copy; + } + Tracev((stderr, "inflate: stored end\n")); + state->mode = TYPE; + break; + + case TABLE: + /* get dynamic table entries descriptor */ + NEEDBITS(14); + state->nlen = BITS(5) + 257; + DROPBITS(5); + state->ndist = BITS(5) + 1; + DROPBITS(5); + state->ncode = BITS(4) + 4; + DROPBITS(4); +#ifndef PKZIP_BUG_WORKAROUND + if (state->nlen > 286 || state->ndist > 30) { + SET_BAD("too many length or distance symbols"); + break; + } +#endif + Tracev((stderr, "inflate: table sizes ok\n")); + state->have = 0; + + /* get code length code lengths (not a typo) */ + while (state->have < state->ncode) { + NEEDBITS(3); + state->lens[order[state->have++]] = (uint16_t)BITS(3); + DROPBITS(3); + } + while (state->have < 19) + state->lens[order[state->have++]] = 0; + state->next = state->codes; + state->lencode = (const code *)(state->next); + state->lenbits = 7; + ret = zng_inflate_table(CODES, state->lens, 19, &(state->next), &(state->lenbits), state->work); + if (ret) { + SET_BAD("invalid code lengths set"); + break; + } + Tracev((stderr, "inflate: code lengths ok\n")); + state->have = 0; + + /* get length and distance code code lengths */ + while (state->have < state->nlen + state->ndist) { + for (;;) { + here = state->lencode[BITS(state->lenbits)]; + if (here.bits <= bits) break; + PULLBYTE(); + } + if (here.val < 16) { + DROPBITS(here.bits); + state->lens[state->have++] = here.val; + } else { + if (here.val == 16) { + NEEDBITS(here.bits + 2); + DROPBITS(here.bits); + if (state->have == 0) { + SET_BAD("invalid bit length repeat"); + break; + } + len = state->lens[state->have - 1]; + copy = 3 + BITS(2); + DROPBITS(2); + } else if (here.val == 17) { + NEEDBITS(here.bits + 3); + DROPBITS(here.bits); + len = 0; + copy = 3 + BITS(3); + DROPBITS(3); + } else { + NEEDBITS(here.bits + 7); + DROPBITS(here.bits); + len = 0; + copy = 11 + BITS(7); + DROPBITS(7); + } + if (state->have + copy > state->nlen + state->ndist) { + SET_BAD("invalid bit length repeat"); + break; + } + while (copy) { + --copy; + state->lens[state->have++] = (uint16_t)len; + } + } + } + + /* handle error breaks in while */ + if (state->mode == BAD) + break; + + /* check for end-of-block code (better have one) */ + if (state->lens[256] == 0) { + SET_BAD("invalid code -- missing end-of-block"); + break; + } + + /* build code tables -- note: do not change the lenbits or distbits + values here (10 and 9) without reading the comments in inftrees.h + concerning the ENOUGH constants, which depend on those values */ + state->next = state->codes; + state->lencode = (const code *)(state->next); + state->lenbits = 10; + ret = zng_inflate_table(LENS, state->lens, state->nlen, &(state->next), &(state->lenbits), state->work); + if (ret) { + SET_BAD("invalid literal/lengths set"); + break; + } + state->distcode = (const code *)(state->next); + state->distbits = 9; + ret = zng_inflate_table(DISTS, state->lens + state->nlen, state->ndist, + &(state->next), &(state->distbits), state->work); + if (ret) { + SET_BAD("invalid distances set"); + break; + } + Tracev((stderr, "inflate: codes ok\n")); + state->mode = LEN; + Z_FALLTHROUGH; + + case LEN: + /* use inflate_fast() if we have enough input and output */ + if (have >= INFLATE_FAST_MIN_HAVE && + left >= INFLATE_FAST_MIN_LEFT) { + RESTORE(); + if (state->whave < state->wsize) + state->whave = state->wsize - left; + FUNCTABLE_CALL(inflate_fast)(strm, state->wsize); + LOAD(); + break; + } + + /* get a literal, length, or end-of-block code */ + for (;;) { + here = state->lencode[BITS(state->lenbits)]; + if (CODE_BITS(here) <= bits) + break; + PULLBYTE(); + } + if (here.op && (here.op & 0xf0) == 0) { + unsigned last_bits; + last = here; + last_bits = CODE_BITS(last); + for (;;) { + here = state->lencode[last.val + (BITS(last_bits + (last.op & 15)) >> last_bits)]; + if (last_bits + CODE_BITS(here) <= bits) + break; + PULLBYTE(); + } + DROPBITS(last_bits); + } + DROPBITS(CODE_BITS(here)); + state->length = here.val; + + /* process literal */ + if ((int)(here.op) == 0) { + TRACE_LITERAL(here.val); + ROOM(); + *put++ = (unsigned char)(state->length); + left--; + state->mode = LEN; + break; + } + + /* process end of block */ + if (here.op & 32) { + TRACE_END_OF_BLOCK(); + state->mode = TYPE; + break; + } + + /* invalid code */ + if (here.op & 64) { + SET_BAD("invalid literal/length code"); + break; + } + + /* length code -- get extra bits, if any */ + state->extra = CODE_EXTRA(here); + if (state->extra) { + NEEDBITS(state->extra); + state->length += BITS(state->extra); + DROPBITS(state->extra); + } + TRACE_LENGTH(state->length); + + /* get distance code */ + for (;;) { + here = state->distcode[BITS(state->distbits)]; + if (CODE_BITS(here) <= bits) + break; + PULLBYTE(); + } + if ((here.op & 0xf0) == 0) { + unsigned last_bits; + last = here; + last_bits = CODE_BITS(last); + for (;;) { + here = state->distcode[last.val + (BITS(last_bits + (last.op & 15)) >> last_bits)]; + if (last_bits + CODE_BITS(here) <= bits) + break; + PULLBYTE(); + } + DROPBITS(last_bits); + } + DROPBITS(CODE_BITS(here)); + if (here.op & 64) { + SET_BAD("invalid distance code"); + break; + } + state->offset = here.val; + state->extra = CODE_EXTRA(here); + + /* get distance extra bits, if any */ + if (state->extra) { + NEEDBITS(state->extra); + state->offset += BITS(state->extra); + DROPBITS(state->extra); + } +#ifdef INFLATE_STRICT + if (state->offset > state->wsize - (state->whave < state->wsize ? left : 0)) { + SET_BAD("invalid distance too far back"); + break; + } +#endif + TRACE_DISTANCE(state->offset); + + /* copy match from window to output */ + do { + ROOM(); + copy = state->wsize - state->offset; + if (copy < left) { + from = put + copy; + copy = left - copy; + } else { + from = put - state->offset; + copy = left; + } + copy = MIN(copy, state->length); + state->length -= copy; + left -= copy; + do { + *put++ = *from++; + } while (--copy); + } while (state->length != 0); + break; + + case DONE: + /* inflate stream terminated properly */ + ret = Z_STREAM_END; + 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; + } + + /* Write leftover output and return unused input */ + inf_leave: + if (left < state->wsize) { + if (out(out_desc, state->window, state->wsize - left) && (ret == Z_STREAM_END)) { + ret = Z_BUF_ERROR; + } + } + strm->next_in = next; + strm->avail_in = have; + return ret; +} + +int32_t Z_EXPORT PREFIX(inflateBackEnd)(PREFIX3(stream) *strm) { + if (strm == NULL || strm->state == NULL || strm->zfree == NULL) + return Z_STREAM_ERROR; + + /* Free allocated buffers */ + free_inflate(strm); + + Tracev((stderr, "inflate: end\n")); + return Z_OK; +} |