/* gzwrite.c -- zlib functions for writing gzip files | |
* Copyright (C) 2004, 2005, 2010 Mark Adler | |
* For conditions of distribution and use, see copyright notice in zlib.h | |
*/ | |
#include "gzguts.h" | |
/* Local functions */ | |
local int gz_init OF((gz_statep)); | |
local int gz_comp OF((gz_statep, int)); | |
local int gz_zero OF((gz_statep, z_off64_t)); | |
/* Initialize state for writing a gzip file. Mark initialization by setting | |
state->size to non-zero. Return -1 on failure or 0 on success. */ | |
local int gz_init(state) | |
gz_statep state; | |
{ | |
int ret; | |
z_streamp strm = &(state->strm); | |
/* allocate input and output buffers */ | |
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); | |
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; | |
} | |
/* 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; | |
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. */ | |
local int gz_comp(state, flush) | |
gz_statep state; | |
int flush; | |
{ | |
int ret, got; | |
unsigned have; | |
z_streamp strm = &(state->strm); | |
/* allocate memory if this is the first time through */ | |
if (state->size == 0 && gz_init(state) == -1) | |
return -1; | |
/* run deflate() on provided input until it produces no more output */ | |
ret = Z_OK; | |
do { | |
/* write out current buffer contents if full, or if flushing, but if | |
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 || | |
(unsigned)got != have)) { | |
gz_error(state, Z_ERRNO, zstrerror()); | |
return -1; | |
} | |
if (strm->avail_out == 0) { | |
strm->avail_out = state->size; | |
strm->next_out = state->out; | |
} | |
state->next = strm->next_out; | |
} | |
/* compress */ | |
have = strm->avail_out; | |
ret = deflate(strm, flush); | |
if (ret == Z_STREAM_ERROR) { | |
gz_error(state, Z_STREAM_ERROR, | |
"internal error: deflate stream corrupt"); | |
return -1; | |
} | |
have -= strm->avail_out; | |
} while (have); | |
/* if that completed a deflate stream, allow another to start */ | |
if (flush == Z_FINISH) | |
deflateReset(strm); | |
/* all done, no errors */ | |
return 0; | |
} | |
/* Compress len zeros to output. Return -1 on error, 0 on success. */ | |
local int gz_zero(state, len) | |
gz_statep state; | |
z_off64_t len; | |
{ | |
int first; | |
unsigned n; | |
z_streamp strm = &(state->strm); | |
/* consume whatever's left in the input buffer */ | |
if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) | |
return -1; | |
/* compress len zeros (len guaranteed > 0) */ | |
first = 1; | |
while (len) { | |
n = GT_OFF(state->size) || (z_off64_t)state->size > len ? | |
(unsigned)len : state->size; | |
if (first) { | |
memset(state->in, 0, n); | |
first = 0; | |
} | |
strm->avail_in = n; | |
strm->next_in = state->in; | |
state->pos += n; | |
if (gz_comp(state, Z_NO_FLUSH) == -1) | |
return -1; | |
len -= n; | |
} | |
return 0; | |
} | |
/* -- see zlib.h -- */ | |
int ZEXPORT gzwrite(file, buf, len) | |
gzFile file; | |
voidpc buf; | |
unsigned len; | |
{ | |
unsigned put = len; | |
unsigned n; | |
gz_statep state; | |
z_streamp strm; | |
/* get internal structure */ | |
if (file == NULL) | |
return 0; | |
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) | |
return 0; | |
/* 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"); | |
return 0; | |
} | |
/* if len is zero, avoid unnecessary operations */ | |
if (len == 0) | |
return 0; | |
/* allocate memory if this is the first time through */ | |
if (state->size == 0 && gz_init(state) == -1) | |
return 0; | |
/* check for seek request */ | |
if (state->seek) { | |
state->seek = 0; | |
if (gz_zero(state, state->skip) == -1) | |
return 0; | |
} | |
/* for small len, copy to input buffer, otherwise compress directly */ | |
if (len < state->size) { | |
/* copy to input buffer, compress when full */ | |
do { | |
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; | |
if (len && gz_comp(state, Z_NO_FLUSH) == -1) | |
return 0; | |
} while (len); | |
} | |
else { | |
/* consume whatever's left in the input buffer */ | |
if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) | |
return 0; | |
/* directly compress user buffer to file */ | |
strm->avail_in = len; | |
strm->next_in = (voidp)buf; | |
state->pos += len; | |
if (gz_comp(state, Z_NO_FLUSH) == -1) | |
return 0; | |
} | |
/* input was all buffered or compressed (put will fit in int) */ | |
return (int)put; | |
} | |
/* -- see zlib.h -- */ | |
int ZEXPORT gzputc(file, c) | |
gzFile file; | |
int c; | |
{ | |
unsigned char buf[1]; | |
gz_statep state; | |
z_streamp strm; | |
/* get internal structure */ | |
if (file == NULL) | |
return -1; | |
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) | |
return -1; | |
/* check for seek request */ | |
if (state->seek) { | |
state->seek = 0; | |
if (gz_zero(state, state->skip) == -1) | |
return -1; | |
} | |
/* try writing to input buffer for speed (state->size == 0 if buffer not | |
initialized) */ | |
if (strm->avail_in < state->size) { | |
if (strm->avail_in == 0) | |
strm->next_in = state->in; | |
strm->next_in[strm->avail_in++] = c; | |
state->pos++; | |
return c; | |
} | |
/* no room in buffer or not initialized, use gz_write() */ | |
buf[0] = c; | |
if (gzwrite(file, buf, 1) != 1) | |
return -1; | |
return c; | |
} | |
/* -- see zlib.h -- */ | |
int ZEXPORT gzputs(file, str) | |
gzFile file; | |
const char *str; | |
{ | |
int ret; | |
unsigned len; | |
/* write string */ | |
len = (unsigned)strlen(str); | |
ret = gzwrite(file, str, len); | |
return ret == 0 && len != 0 ? -1 : ret; | |
} | |
#ifdef STDC | |
#include <stdarg.h> | |
/* -- see zlib.h -- */ | |
int ZEXPORTVA gzprintf (gzFile file, const char *format, ...) | |
{ | |
int size, len; | |
gz_statep state; | |
z_streamp strm; | |
va_list va; | |
/* get internal structure */ | |
if (file == NULL) | |
return -1; | |
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) | |
return 0; | |
/* make sure we have some buffer space */ | |
if (state->size == 0 && gz_init(state) == -1) | |
return 0; | |
/* check for seek request */ | |
if (state->seek) { | |
state->seek = 0; | |
if (gz_zero(state, state->skip) == -1) | |
return 0; | |
} | |
/* consume whatever's left in the input buffer */ | |
if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) | |
return 0; | |
/* do the printf() into the input buffer, put length in len */ | |
size = (int)(state->size); | |
state->in[size - 1] = 0; | |
va_start(va, format); | |
#ifdef NO_vsnprintf | |
# ifdef HAS_vsprintf_void | |
(void)vsprintf(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); | |
va_end(va); | |
# endif | |
#else | |
# ifdef HAS_vsnprintf_void | |
(void)vsnprintf(state->in, size, format, va); | |
va_end(va); | |
len = strlen(state->in); | |
# else | |
len = vsnprintf((char *)(state->in), size, format, va); | |
va_end(va); | |
# endif | |
#endif | |
/* check that printf() results fit in buffer */ | |
if (len <= 0 || len >= (int)size || state->in[size - 1] != 0) | |
return 0; | |
/* update buffer and position, defer compression until needed */ | |
strm->avail_in = (unsigned)len; | |
strm->next_in = state->in; | |
state->pos += len; | |
return len; | |
} | |
#else /* !STDC */ | |
/* -- see zlib.h -- */ | |
int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, | |
a11, a12, a13, a14, a15, a16, a17, a18, a19, a20) | |
gzFile file; | |
const char *format; | |
int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, | |
a11, a12, a13, a14, a15, a16, a17, a18, a19, a20; | |
{ | |
int size, len; | |
gz_statep state; | |
z_streamp strm; | |
/* get internal structure */ | |
if (file == NULL) | |
return -1; | |
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) | |
return 0; | |
/* make sure we have some buffer space */ | |
if (state->size == 0 && gz_init(state) == -1) | |
return 0; | |
/* check for seek request */ | |
if (state->seek) { | |
state->seek = 0; | |
if (gz_zero(state, state->skip) == -1) | |
return 0; | |
} | |
/* consume whatever's left in the input buffer */ | |
if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) | |
return 0; | |
/* do the printf() into the input buffer, put length in len */ | |
size = (int)(state->size); | |
state->in[size - 1] = 0; | |
#ifdef NO_snprintf | |
# ifdef HAS_sprintf_void | |
sprintf(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); | |
# endif | |
#else | |
# ifdef HAS_snprintf_void | |
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 = strlen(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); | |
# endif | |
#endif | |
/* check that printf() results fit in buffer */ | |
if (len <= 0 || len >= (int)size || state->in[size - 1] != 0) | |
return 0; | |
/* update buffer and position, defer compression until needed */ | |
strm->avail_in = (unsigned)len; | |
strm->next_in = state->in; | |
state->pos += len; | |
return len; | |
} | |
#endif | |
/* -- see zlib.h -- */ | |
int ZEXPORT gzflush(file, flush) | |
gzFile file; | |
int flush; | |
{ | |
gz_statep state; | |
/* get internal structure */ | |
if (file == NULL) | |
return -1; | |
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 -1; | |
} | |
/* compress remaining data with requested flush */ | |
gz_comp(state, flush); | |
return state->err; | |
} | |
/* -- see zlib.h -- */ | |
int ZEXPORT gzsetparams(file, level, strategy) | |
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) | |
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 -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 = 0; | |
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; | |
ret += gz_zero(state, state->skip); | |
} | |
/* flush, free memory, and close file */ | |
ret += gz_comp(state, Z_FINISH); | |
(void)deflateEnd(&(state->strm)); | |
free(state->out); | |
free(state->in); | |
gz_error(state, Z_OK, NULL); | |
free(state->path); | |
ret += close(state->fd); | |
free(state); | |
return ret ? Z_ERRNO : Z_OK; | |
} |