/* gzwrite.c -- zlib functions for writing gzip files
- * Copyright (C) 2004, 2005, 2010, 2011 Mark Adler
+ * Copyright (C) 2004, 2005, 2010, 2011, 2012 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*/
int ret;
z_streamp strm = &(state->strm);
- /* allocate input and output buffers */
+ /* allocate input buffer */
state->in = malloc(state->want);
- state->out = malloc(state->want);
- if (state->in == NULL || state->out == NULL) {
- if (state->out != NULL)
- free(state->out);
- if (state->in != NULL)
- free(state->in);
+ if (state->in == NULL) {
gz_error(state, Z_MEM_ERROR, "out of memory");
return -1;
}
- /* allocate deflate memory, set up for gzip compression */
- strm->zalloc = Z_NULL;
- strm->zfree = Z_NULL;
- strm->opaque = Z_NULL;
- ret = deflateInit2(strm, state->level, Z_DEFLATED,
- 15 + 16, 8, state->strategy);
- if (ret != Z_OK) {
- free(state->in);
- gz_error(state, Z_MEM_ERROR, "out of memory");
- return -1;
+ /* only need output buffer and deflate state if compressing */
+ if (!state->direct) {
+ /* allocate output buffer */
+ state->out = malloc(state->want);
+ if (state->out == NULL) {
+ free(state->in);
+ gz_error(state, Z_MEM_ERROR, "out of memory");
+ return -1;
+ }
+
+ /* allocate deflate memory, set up for gzip compression */
+ strm->zalloc = Z_NULL;
+ strm->zfree = Z_NULL;
+ strm->opaque = Z_NULL;
+ ret = deflateInit2(strm, state->level, Z_DEFLATED,
+ MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
+ if (ret != Z_OK) {
+ free(state->out);
+ free(state->in);
+ gz_error(state, Z_MEM_ERROR, "out of memory");
+ return -1;
+ }
}
/* mark state as initialized */
state->size = state->want;
- /* initialize write buffer */
- strm->avail_out = state->size;
- strm->next_out = state->out;
- state->next = strm->next_out;
+ /* initialize write buffer if compressing */
+ if (!state->direct) {
+ strm->avail_out = state->size;
+ strm->next_out = state->out;
+ state->x.next = strm->next_out;
+ }
return 0;
}
/* Compress whatever is at avail_in and next_in and write to the output file.
Return -1 if there is an error writing to the output file, otherwise 0.
flush is assumed to be a valid deflate() flush value. If flush is Z_FINISH,
- then the deflate() state is reset to start a new gzip stream. */
+ then the deflate() state is reset to start a new gzip stream. If gz->direct
+ is true, then simply write to the output file without compressing, and
+ ignore flush. */
local int gz_comp(state, flush)
gz_statep state;
int flush;
if (state->size == 0 && gz_init(state) == -1)
return -1;
+ /* write directly if requested */
+ if (state->direct) {
+ got = write(state->fd, strm->next_in, strm->avail_in);
+ if (got < 0 || (unsigned)got != strm->avail_in) {
+ gz_error(state, Z_ERRNO, zstrerror());
+ return -1;
+ }
+ strm->avail_in = 0;
+ return 0;
+ }
+
/* run deflate() on provided input until it produces no more output */
ret = Z_OK;
do {
doing Z_FINISH then don't write until we get to Z_STREAM_END */
if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
(flush != Z_FINISH || ret == Z_STREAM_END))) {
- have = (unsigned)(strm->next_out - state->next);
- if (have && ((got = write(state->fd, state->next, have)) < 0 ||
+ have = (unsigned)(strm->next_out - state->x.next);
+ if (have && ((got = write(state->fd, state->x.next, have)) < 0 ||
(unsigned)got != have)) {
gz_error(state, Z_ERRNO, zstrerror());
return -1;
strm->avail_out = state->size;
strm->next_out = state->out;
}
- state->next = strm->next_out;
+ state->x.next = strm->next_out;
}
/* compress */
}
strm->avail_in = n;
strm->next_in = state->in;
- state->pos += n;
+ state->x.pos += n;
if (gz_comp(state, Z_NO_FLUSH) == -1)
return -1;
len -= n;
unsigned len;
{
unsigned put = len;
- unsigned n;
gz_statep state;
z_streamp strm;
/* since an int is returned, make sure len fits in one, otherwise return
with an error (this avoids the flaw in the interface) */
if ((int)len < 0) {
- gz_error(state, Z_BUF_ERROR, "requested length does not fit in int");
+ gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
return 0;
}
if (len < state->size) {
/* copy to input buffer, compress when full */
do {
+ unsigned have, copy;
+
if (strm->avail_in == 0)
strm->next_in = state->in;
- n = state->size - strm->avail_in;
- if (n > len)
- n = len;
- memcpy(strm->next_in + strm->avail_in, buf, n);
- strm->avail_in += n;
- state->pos += n;
- buf = (char *)buf + n;
- len -= n;
+ have = strm->next_in + strm->avail_in - state->in;
+ copy = state->size - have;
+ if (copy > len)
+ copy = len;
+ memcpy(state->in + have, buf, copy);
+ strm->avail_in += copy;
+ state->x.pos += copy;
+ buf = (const char *)buf + copy;
+ len -= copy;
if (len && gz_comp(state, Z_NO_FLUSH) == -1)
return 0;
} while (len);
/* directly compress user buffer to file */
strm->avail_in = len;
- strm->next_in = (voidp)buf;
- state->pos += len;
+ strm->next_in = (z_const Bytef *)buf;
+ state->x.pos += len;
if (gz_comp(state, Z_NO_FLUSH) == -1)
return 0;
}
gzFile file;
int c;
{
+ unsigned have;
unsigned char buf[1];
gz_statep state;
z_streamp strm;
/* try writing to input buffer for speed (state->size == 0 if buffer not
initialized) */
- if (strm->avail_in < state->size) {
+ if (state->size) {
if (strm->avail_in == 0)
strm->next_in = state->in;
- strm->next_in[strm->avail_in++] = c;
- state->pos++;
- return c;
+ have = strm->next_in + strm->avail_in - state->in;
+ if (have < state->size) {
+ state->in[have] = c;
+ strm->avail_in++;
+ state->x.pos++;
+ return c & 0xff;
+ }
}
/* no room in buffer or not initialized, use gz_write() */
buf[0] = c;
if (gzwrite(file, buf, 1) != 1)
return -1;
- return c;
+ return c & 0xff;
}
/* -- see zlib.h -- */
va_start(va, format);
#ifdef NO_vsnprintf
# ifdef HAS_vsprintf_void
- (void)vsprintf(state->in, format, va);
+ (void)vsprintf((char *)(state->in), format, va);
va_end(va);
for (len = 0; len < size; len++)
if (state->in[len] == 0) break;
# else
- len = vsprintf(state->in, format, va);
+ len = vsprintf((char *)(state->in), format, va);
va_end(va);
# endif
#else
# ifdef HAS_vsnprintf_void
- (void)vsnprintf(state->in, size, format, va);
+ (void)vsnprintf((char *)(state->in), size, format, va);
va_end(va);
- len = strlen(state->in);
+ len = strlen((char *)(state->in));
# else
len = vsnprintf((char *)(state->in), size, format, va);
va_end(va);
/* update buffer and position, defer compression until needed */
strm->avail_in = (unsigned)len;
strm->next_in = state->in;
- state->pos += len;
+ state->x.pos += len;
return len;
}
state->in[size - 1] = 0;
#ifdef NO_snprintf
# ifdef HAS_sprintf_void
- sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8,
+ sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
for (len = 0; len < size; len++)
if (state->in[len] == 0) break;
# else
- len = sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8,
- a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+ len = sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
+ a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
# endif
#else
# ifdef HAS_snprintf_void
- snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8,
+ snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,
a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
- len = strlen(state->in);
+ len = strlen((char *)(state->in));
# else
- len = snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8,
- a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+ len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6,
+ a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18,
+ a19, a20);
# endif
#endif
/* update buffer and position, defer compression until needed */
strm->avail_in = (unsigned)len;
strm->next_in = state->in;
- state->pos += len;
+ state->x.pos += len;
return len;
}
int ZEXPORT gzclose_w(file)
gzFile file;
{
- int ret = 0;
+ int ret = Z_OK;
gz_statep state;
/* get internal structure */
/* check for seek request */
if (state->seek) {
state->seek = 0;
- ret += gz_zero(state, state->skip);
+ if (gz_zero(state, state->skip) == -1)
+ ret = state->err;
}
/* flush, free memory, and close file */
- ret += gz_comp(state, Z_FINISH);
- (void)deflateEnd(&(state->strm));
- free(state->out);
- free(state->in);
+ 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);
- ret += close(state->fd);
+ if (close(state->fd) == -1)
+ ret = Z_ERRNO;
free(state);
- return ret ? Z_ERRNO : Z_OK;
+ return ret;
}
projects / zlib.git / blobdiff