533 lines
14 KiB
C
533 lines
14 KiB
C
/* 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"
|
|
#include <unistd.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;
|
|
}
|