578 lines
16 KiB
C
578 lines
16 KiB
C
/* gzwrite.c -- zlib functions for writing gzip files
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* Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 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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/* Local functions */
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local int gz_init OF((gz_statep));
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local int gz_comp OF((gz_statep, int));
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local int gz_zero OF((gz_statep, z_off64_t));
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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 failure or 0 on success. */
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local int gz_init(state)
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gz_statep state;
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{
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int ret;
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z_streamp strm = &(state->strm);
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/* allocate input buffer */
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state->in = (unsigned char *)malloc(state->want);
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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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}
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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, otherwise 0.
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flush is assumed to be a valid deflate() flush value. If flush is Z_FINISH,
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then the deflate() state is reset to start a new gzip stream. If gz->direct
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is true, then simply write to the output file without compressing, and
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ignore flush. */
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local int gz_comp(state, flush)
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gz_statep state;
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int flush;
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{
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int ret, got;
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unsigned have;
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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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got = write(state->fd, strm->next_in, strm->avail_in);
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if (got < 0 || (unsigned)got != strm->avail_in) {
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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 = 0;
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return 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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have = (unsigned)(strm->next_out - state->x.next);
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if (have && ((got = write(state->fd, state->x.next, have)) < 0 ||
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(unsigned)got != have)) {
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gz_error(state, Z_ERRNO, zstrerror());
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return -1;
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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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}
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state->x.next = strm->next_out;
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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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deflateReset(strm);
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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 error, 0 on success. */
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local int gz_zero(state, len)
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gz_statep state;
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z_off64_t len;
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{
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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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/* -- see zlib.h -- */
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int ZEXPORT gzwrite(file, buf, len)
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gzFile file;
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voidpc buf;
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unsigned len;
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{
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unsigned put = len;
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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 0;
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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 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 the 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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/* 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 (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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copy = state->size - have;
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if (copy > len)
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copy = len;
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memcpy(state->in + have, buf, copy);
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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 (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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strm->avail_in = len;
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strm->next_in = (z_const Bytef *)buf;
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state->x.pos += len;
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if (gz_comp(state, Z_NO_FLUSH) == -1)
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return 0;
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}
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/* input was all buffered or compressed (put will fit in int) */
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return (int)put;
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}
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/* -- see zlib.h -- */
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int ZEXPORT gzputc(file, c)
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gzFile file;
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int c;
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{
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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] = 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] = c;
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if (gzwrite(file, 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(file, str)
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gzFile file;
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const char *str;
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{
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int ret;
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unsigned len;
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/* write string */
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len = (unsigned)strlen(str);
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ret = gzwrite(file, str, len);
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return ret == 0 && len != 0 ? -1 : ret;
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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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{
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int size, len;
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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 0;
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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 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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/* 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 0;
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/* do the printf() into the input buffer, put length in len */
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size = (int)(state->size);
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state->in[size - 1] = 0;
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#ifdef NO_vsnprintf
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# ifdef HAS_vsprintf_void
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(void)vsprintf((char *)(state->in), format, va);
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for (len = 0; len < size; len++)
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if (state->in[len] == 0) break;
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# else
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len = vsprintf((char *)(state->in), 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((char *)(state->in), size, format, va);
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len = strlen((char *)(state->in));
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# else
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len = vsnprintf((char *)(state->in), 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 || len >= (int)size || state->in[size - 1] != 0)
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return 0;
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/* update buffer and position, defer compression until needed */
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strm->avail_in = (unsigned)len;
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strm->next_in = state->in;
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state->x.pos += len;
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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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{
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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 (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
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a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
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gzFile file;
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const char *format;
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int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
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a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
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{
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int size, len;
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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 can really pass pointer in ints */
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if (sizeof(int) != sizeof(void *))
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return 0;
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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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/* make sure we have some buffer space */
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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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/* 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 0;
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/* do the printf() into the input buffer, put length in len */
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size = (int)(state->size);
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state->in[size - 1] = 0;
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#ifdef NO_snprintf
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# ifdef HAS_sprintf_void
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sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
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a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
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for (len = 0; len < size; len++)
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if (state->in[len] == 0) break;
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# else
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len = sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
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a9, a10, a11, 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((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,
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a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
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len = strlen((char *)(state->in));
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# else
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len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6,
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a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18,
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a19, a20);
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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 || len >= (int)size || state->in[size - 1] != 0)
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return 0;
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/* update buffer and position, defer compression until needed */
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strm->avail_in = (unsigned)len;
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strm->next_in = state->in;
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state->x.pos += len;
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return len;
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}
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#endif
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/* -- see zlib.h -- */
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int ZEXPORT gzflush(file, flush)
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gzFile file;
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int flush;
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{
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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 Z_STREAM_ERROR;
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/* check flush parameter */
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if (flush < 0 || flush > Z_FINISH)
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return Z_STREAM_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 -1;
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}
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/* compress remaining data with requested flush */
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gz_comp(state, flush);
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return state->err;
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}
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/* -- see zlib.h -- */
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int ZEXPORT gzsetparams(file, level, strategy)
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gzFile file;
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int level;
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int strategy;
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{
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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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/* if no change is requested, then do nothing */
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if (level == state->level && strategy == state->strategy)
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return Z_OK;
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/* check for seek request */
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|
if (state->seek) {
|
|
state->seek = 0;
|
|
if (gz_zero(state, state->skip) == -1)
|
|
return -1;
|
|
}
|
|
|
|
/* 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_PARTIAL_FLUSH) == -1)
|
|
return state->err;
|
|
deflateParams(strm, level, strategy);
|
|
}
|
|
state->level = level;
|
|
state->strategy = strategy;
|
|
return Z_OK;
|
|
}
|
|
|
|
/* -- see zlib.h -- */
|
|
int ZEXPORT gzclose_w(file)
|
|
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;
|
|
}
|