632 строки
19 KiB
C
632 строки
19 KiB
C
/* gzwrite.c -- zlib functions for writing gzip files
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* Copyright (C) 2004-2019 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 "gzguts.h"
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/* Initialize state for writing a gzip file. Mark initialization by setting
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state->size to non-zero. Return -1 on a memory allocation failure, or 0 on
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success. */
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local int gz_init(gz_statep state) {
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int ret;
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z_streamp strm = &(state->strm);
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/* allocate input buffer (double size for gzprintf) */
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state->in = (unsigned char *)malloc(state->want << 1);
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if (state->in == NULL) {
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gz_error(state, Z_MEM_ERROR, "out of memory");
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return -1;
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}
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/* only need output buffer and deflate state if compressing */
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if (!state->direct) {
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/* allocate output buffer */
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state->out = (unsigned char *)malloc(state->want);
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if (state->out == NULL) {
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free(state->in);
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gz_error(state, Z_MEM_ERROR, "out of memory");
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return -1;
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}
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/* allocate deflate memory, set up for gzip compression */
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strm->zalloc = Z_NULL;
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strm->zfree = Z_NULL;
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strm->opaque = Z_NULL;
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ret = deflateInit2(strm, state->level, Z_DEFLATED,
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MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
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if (ret != Z_OK) {
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free(state->out);
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free(state->in);
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gz_error(state, Z_MEM_ERROR, "out of memory");
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return -1;
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}
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strm->next_in = NULL;
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}
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/* mark state as initialized */
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state->size = state->want;
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/* initialize write buffer if compressing */
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if (!state->direct) {
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strm->avail_out = state->size;
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strm->next_out = state->out;
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state->x.next = strm->next_out;
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}
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return 0;
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}
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/* Compress whatever is at avail_in and next_in and write to the output file.
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Return -1 if there is an error writing to the output file or if gz_init()
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fails to allocate memory, otherwise 0. flush is assumed to be a valid
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deflate() flush value. If flush is Z_FINISH, then the deflate() state is
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reset to start a new gzip stream. If gz->direct is true, then simply write
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to the output file without compressing, and ignore flush. */
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local int gz_comp(gz_statep state, int flush) {
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int ret, writ;
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unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
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z_streamp strm = &(state->strm);
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/* allocate memory if this is the first time through */
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if (state->size == 0 && gz_init(state) == -1)
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return -1;
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/* write directly if requested */
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if (state->direct) {
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while (strm->avail_in) {
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put = strm->avail_in > max ? max : strm->avail_in;
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writ = write(state->fd, strm->next_in, put);
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if (writ < 0) {
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gz_error(state, Z_ERRNO, zstrerror());
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return -1;
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}
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strm->avail_in -= (unsigned)writ;
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strm->next_in += writ;
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}
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return 0;
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}
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/* check for a pending reset */
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if (state->reset) {
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/* don't start a new gzip member unless there is data to write */
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if (strm->avail_in == 0)
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return 0;
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deflateReset(strm);
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state->reset = 0;
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}
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/* run deflate() on provided input until it produces no more output */
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ret = Z_OK;
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do {
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/* write out current buffer contents if full, or if flushing, but if
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doing Z_FINISH then don't write until we get to Z_STREAM_END */
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if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
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(flush != Z_FINISH || ret == Z_STREAM_END))) {
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while (strm->next_out > state->x.next) {
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put = strm->next_out - state->x.next > (int)max ? max :
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(unsigned)(strm->next_out - state->x.next);
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writ = write(state->fd, state->x.next, put);
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if (writ < 0) {
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gz_error(state, Z_ERRNO, zstrerror());
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return -1;
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}
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state->x.next += writ;
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}
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if (strm->avail_out == 0) {
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strm->avail_out = state->size;
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strm->next_out = state->out;
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state->x.next = state->out;
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}
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}
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/* compress */
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have = strm->avail_out;
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ret = deflate(strm, flush);
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if (ret == Z_STREAM_ERROR) {
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gz_error(state, Z_STREAM_ERROR,
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"internal error: deflate stream corrupt");
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return -1;
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}
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have -= strm->avail_out;
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} while (have);
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/* if that completed a deflate stream, allow another to start */
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if (flush == Z_FINISH)
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state->reset = 1;
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/* all done, no errors */
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return 0;
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}
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/* Compress len zeros to output. Return -1 on a write error or memory
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allocation failure by gz_comp(), or 0 on success. */
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local int gz_zero(gz_statep state, z_off64_t len) {
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int first;
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unsigned n;
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z_streamp strm = &(state->strm);
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/* consume whatever's left in the input buffer */
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if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
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return -1;
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/* compress len zeros (len guaranteed > 0) */
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first = 1;
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while (len) {
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n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
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(unsigned)len : state->size;
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if (first) {
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memset(state->in, 0, n);
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first = 0;
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}
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strm->avail_in = n;
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strm->next_in = state->in;
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state->x.pos += n;
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if (gz_comp(state, Z_NO_FLUSH) == -1)
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return -1;
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len -= n;
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}
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return 0;
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}
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/* Write len bytes from buf to file. Return the number of bytes written. If
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the returned value is less than len, then there was an error. */
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local z_size_t gz_write(gz_statep state, voidpc buf, z_size_t len) {
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z_size_t put = len;
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/* if len is zero, avoid unnecessary operations */
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if (len == 0)
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return 0;
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/* allocate memory if this is the first time through */
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if (state->size == 0 && gz_init(state) == -1)
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return 0;
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/* check for seek request */
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if (state->seek) {
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state->seek = 0;
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if (gz_zero(state, state->skip) == -1)
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return 0;
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}
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/* for small len, copy to input buffer, otherwise compress directly */
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if (len < state->size) {
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/* copy to input buffer, compress when full */
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do {
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unsigned have, copy;
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if (state->strm.avail_in == 0)
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state->strm.next_in = state->in;
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have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
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state->in);
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copy = state->size - have;
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if (copy > len)
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copy = (unsigned)len;
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memcpy(state->in + have, buf, copy);
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state->strm.avail_in += copy;
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state->x.pos += copy;
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buf = (const char *)buf + copy;
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len -= copy;
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if (len && gz_comp(state, Z_NO_FLUSH) == -1)
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return 0;
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} while (len);
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}
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else {
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/* consume whatever's left in the input buffer */
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if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
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return 0;
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/* directly compress user buffer to file */
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state->strm.next_in = (z_const Bytef *)buf;
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do {
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unsigned n = (unsigned)-1;
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if (n > len)
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n = (unsigned)len;
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state->strm.avail_in = n;
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state->x.pos += n;
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if (gz_comp(state, Z_NO_FLUSH) == -1)
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return 0;
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len -= n;
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} while (len);
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}
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/* input was all buffered or compressed */
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return put;
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}
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/* -- see zlib.h -- */
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int ZEXPORT gzwrite(gzFile file, voidpc buf, unsigned len) {
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gz_statep state;
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/* get internal structure */
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if (file == NULL)
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return 0;
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state = (gz_statep)file;
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/* check that we're writing and that there's no error */
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if (state->mode != GZ_WRITE || state->err != Z_OK)
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return 0;
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/* since an int is returned, make sure len fits in one, otherwise return
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with an error (this avoids a flaw in the interface) */
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if ((int)len < 0) {
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gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
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return 0;
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}
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/* write len bytes from buf (the return value will fit in an int) */
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return (int)gz_write(state, buf, len);
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}
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/* -- see zlib.h -- */
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z_size_t ZEXPORT gzfwrite(voidpc buf, z_size_t size, z_size_t nitems,
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gzFile file) {
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z_size_t len;
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gz_statep state;
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/* get internal structure */
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if (file == NULL)
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return 0;
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state = (gz_statep)file;
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/* check that we're writing and that there's no error */
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if (state->mode != GZ_WRITE || state->err != Z_OK)
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return 0;
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/* compute bytes to read -- error on overflow */
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len = nitems * size;
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if (size && len / size != nitems) {
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gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
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return 0;
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}
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/* write len bytes to buf, return the number of full items written */
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return len ? gz_write(state, buf, len) / size : 0;
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}
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/* -- see zlib.h -- */
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int ZEXPORT gzputc(gzFile file, int c) {
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unsigned have;
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unsigned char buf[1];
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gz_statep state;
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z_streamp strm;
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/* get internal structure */
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if (file == NULL)
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return -1;
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state = (gz_statep)file;
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strm = &(state->strm);
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/* check that we're writing and that there's no error */
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if (state->mode != GZ_WRITE || state->err != Z_OK)
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return -1;
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/* check for seek request */
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if (state->seek) {
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state->seek = 0;
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if (gz_zero(state, state->skip) == -1)
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return -1;
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}
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/* try writing to input buffer for speed (state->size == 0 if buffer not
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initialized) */
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if (state->size) {
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if (strm->avail_in == 0)
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strm->next_in = state->in;
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have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
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if (have < state->size) {
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state->in[have] = (unsigned char)c;
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strm->avail_in++;
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state->x.pos++;
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return c & 0xff;
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}
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}
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/* no room in buffer or not initialized, use gz_write() */
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buf[0] = (unsigned char)c;
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if (gz_write(state, buf, 1) != 1)
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return -1;
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return c & 0xff;
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}
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/* -- see zlib.h -- */
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int ZEXPORT gzputs(gzFile file, const char *s) {
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z_size_t len, put;
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gz_statep state;
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/* get internal structure */
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if (file == NULL)
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return -1;
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state = (gz_statep)file;
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/* check that we're writing and that there's no error */
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if (state->mode != GZ_WRITE || state->err != Z_OK)
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return -1;
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/* write string */
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len = strlen(s);
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if ((int)len < 0 || (unsigned)len != len) {
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gz_error(state, Z_STREAM_ERROR, "string length does not fit in int");
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return -1;
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}
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put = gz_write(state, s, len);
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return put < len ? -1 : (int)len;
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}
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#if defined(STDC) || defined(Z_HAVE_STDARG_H)
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#include <stdarg.h>
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/* -- see zlib.h -- */
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int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va) {
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int len;
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unsigned left;
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char *next;
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gz_statep state;
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z_streamp strm;
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/* get internal structure */
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if (file == NULL)
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return Z_STREAM_ERROR;
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state = (gz_statep)file;
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strm = &(state->strm);
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/* check that we're writing and that there's no error */
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if (state->mode != GZ_WRITE || state->err != Z_OK)
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return Z_STREAM_ERROR;
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/* make sure we have some buffer space */
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if (state->size == 0 && gz_init(state) == -1)
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return state->err;
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/* check for seek request */
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if (state->seek) {
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state->seek = 0;
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if (gz_zero(state, state->skip) == -1)
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return state->err;
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}
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/* do the printf() into the input buffer, put length in len -- the input
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buffer is double-sized just for this function, so there is guaranteed to
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be state->size bytes available after the current contents */
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if (strm->avail_in == 0)
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strm->next_in = state->in;
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next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
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next[state->size - 1] = 0;
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#ifdef NO_vsnprintf
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# ifdef HAS_vsprintf_void
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(void)vsprintf(next, format, va);
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for (len = 0; len < state->size; len++)
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if (next[len] == 0) break;
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# else
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len = vsprintf(next, format, va);
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# endif
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#else
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# ifdef HAS_vsnprintf_void
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(void)vsnprintf(next, state->size, format, va);
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len = strlen(next);
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# else
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len = vsnprintf(next, state->size, format, va);
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# endif
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#endif
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/* check that printf() results fit in buffer */
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if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
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return 0;
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/* update buffer and position, compress first half if past that */
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strm->avail_in += (unsigned)len;
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state->x.pos += len;
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if (strm->avail_in >= state->size) {
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left = strm->avail_in - state->size;
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strm->avail_in = state->size;
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if (gz_comp(state, Z_NO_FLUSH) == -1)
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return state->err;
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memmove(state->in, state->in + state->size, left);
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strm->next_in = state->in;
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strm->avail_in = left;
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}
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return len;
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}
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int ZEXPORTVA gzprintf(gzFile file, const char *format, ...) {
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va_list va;
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int ret;
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va_start(va, format);
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ret = gzvprintf(file, format, va);
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va_end(va);
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return ret;
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}
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#else /* !STDC && !Z_HAVE_STDARG_H */
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/* -- see zlib.h -- */
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int ZEXPORTVA gzprintf(gzFile file, const char *format, int a1, int a2, int a3,
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int a4, int a5, int a6, int a7, int a8, int a9, int a10,
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int a11, int a12, int a13, int a14, int a15, int a16,
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int a17, int a18, int a19, int a20) {
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unsigned len, left;
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char *next;
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gz_statep state;
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z_streamp strm;
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/* get internal structure */
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if (file == NULL)
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return Z_STREAM_ERROR;
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state = (gz_statep)file;
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strm = &(state->strm);
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/* check that can really pass pointer in ints */
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if (sizeof(int) != sizeof(void *))
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return Z_STREAM_ERROR;
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/* check that we're writing and that there's no error */
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if (state->mode != GZ_WRITE || state->err != Z_OK)
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return Z_STREAM_ERROR;
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/* make sure we have some buffer space */
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if (state->size == 0 && gz_init(state) == -1)
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return state->error;
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/* check for seek request */
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if (state->seek) {
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state->seek = 0;
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if (gz_zero(state, state->skip) == -1)
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return state->error;
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}
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/* do the printf() into the input buffer, put length in len -- the input
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buffer is double-sized just for this function, so there is guaranteed to
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be state->size bytes available after the current contents */
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if (strm->avail_in == 0)
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strm->next_in = state->in;
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next = (char *)(strm->next_in + strm->avail_in);
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next[state->size - 1] = 0;
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#ifdef NO_snprintf
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# ifdef HAS_sprintf_void
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sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
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a13, a14, a15, a16, a17, a18, a19, a20);
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for (len = 0; len < size; len++)
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if (next[len] == 0)
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break;
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# else
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len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
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a12, a13, a14, a15, a16, a17, a18, a19, a20);
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# endif
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#else
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# ifdef HAS_snprintf_void
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snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
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a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
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len = strlen(next);
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# else
|
|
len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
|
|
a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
|
|
# endif
|
|
#endif
|
|
|
|
/* check that printf() results fit in buffer */
|
|
if (len == 0 || len >= state->size || next[state->size - 1] != 0)
|
|
return 0;
|
|
|
|
/* update buffer and position, compress first half if past that */
|
|
strm->avail_in += len;
|
|
state->x.pos += len;
|
|
if (strm->avail_in >= state->size) {
|
|
left = strm->avail_in - state->size;
|
|
strm->avail_in = state->size;
|
|
if (gz_comp(state, Z_NO_FLUSH) == -1)
|
|
return state->err;
|
|
memmove(state->in, state->in + state->size, left);
|
|
strm->next_in = state->in;
|
|
strm->avail_in = left;
|
|
}
|
|
return (int)len;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* -- see zlib.h -- */
|
|
int ZEXPORT gzflush(gzFile file, int flush) {
|
|
gz_statep state;
|
|
|
|
/* get internal structure */
|
|
if (file == NULL)
|
|
return Z_STREAM_ERROR;
|
|
state = (gz_statep)file;
|
|
|
|
/* check that we're writing and that there's no error */
|
|
if (state->mode != GZ_WRITE || state->err != Z_OK)
|
|
return Z_STREAM_ERROR;
|
|
|
|
/* check flush parameter */
|
|
if (flush < 0 || flush > Z_FINISH)
|
|
return Z_STREAM_ERROR;
|
|
|
|
/* check for seek request */
|
|
if (state->seek) {
|
|
state->seek = 0;
|
|
if (gz_zero(state, state->skip) == -1)
|
|
return state->err;
|
|
}
|
|
|
|
/* compress remaining data with requested flush */
|
|
(void)gz_comp(state, flush);
|
|
return state->err;
|
|
}
|
|
|
|
/* -- see zlib.h -- */
|
|
int ZEXPORT gzsetparams(gzFile file, int level, int strategy) {
|
|
gz_statep state;
|
|
z_streamp strm;
|
|
|
|
/* get internal structure */
|
|
if (file == NULL)
|
|
return Z_STREAM_ERROR;
|
|
state = (gz_statep)file;
|
|
strm = &(state->strm);
|
|
|
|
/* check that we're writing and that there's no error */
|
|
if (state->mode != GZ_WRITE || state->err != Z_OK || state->direct)
|
|
return Z_STREAM_ERROR;
|
|
|
|
/* if no change is requested, then do nothing */
|
|
if (level == state->level && strategy == state->strategy)
|
|
return Z_OK;
|
|
|
|
/* check for seek request */
|
|
if (state->seek) {
|
|
state->seek = 0;
|
|
if (gz_zero(state, state->skip) == -1)
|
|
return state->err;
|
|
}
|
|
|
|
/* change compression parameters for subsequent input */
|
|
if (state->size) {
|
|
/* flush previous input with previous parameters before changing */
|
|
if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
|
|
return state->err;
|
|
deflateParams(strm, level, strategy);
|
|
}
|
|
state->level = level;
|
|
state->strategy = strategy;
|
|
return Z_OK;
|
|
}
|
|
|
|
/* -- see zlib.h -- */
|
|
int ZEXPORT gzclose_w(gzFile file) {
|
|
int ret = Z_OK;
|
|
gz_statep state;
|
|
|
|
/* get internal structure */
|
|
if (file == NULL)
|
|
return Z_STREAM_ERROR;
|
|
state = (gz_statep)file;
|
|
|
|
/* check that we're writing */
|
|
if (state->mode != GZ_WRITE)
|
|
return Z_STREAM_ERROR;
|
|
|
|
/* check for seek request */
|
|
if (state->seek) {
|
|
state->seek = 0;
|
|
if (gz_zero(state, state->skip) == -1)
|
|
ret = state->err;
|
|
}
|
|
|
|
/* flush, free memory, and close file */
|
|
if (gz_comp(state, Z_FINISH) == -1)
|
|
ret = state->err;
|
|
if (state->size) {
|
|
if (!state->direct) {
|
|
(void)deflateEnd(&(state->strm));
|
|
free(state->out);
|
|
}
|
|
free(state->in);
|
|
}
|
|
gz_error(state, Z_OK, NULL);
|
|
free(state->path);
|
|
if (close(state->fd) == -1)
|
|
ret = Z_ERRNO;
|
|
free(state);
|
|
return ret;
|
|
}
|