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#include <config.h>
#ifdef HAVE_ZLIB
#include <zlib.h>
#define TRANSFORM_UNUSED(x) x
#else
#define TRANSFORM_UNUSED(x) UNUSED(x)
#endif /* HAVE_ZLIB */
#include "transformation.h"
/*
* Initialize
*/
static int
zlib_initialize(UNUSED(Transformation *xform), UNUSED(int enc))
{
return 0;
}
/*
* Shut down.
*/
static int
zlib_shutdown(UNUSED(Transformation *xform))
{
return 0;
}
/*
* Handle forks.
*/
static int
zlib_startNewTape(UNUSED(Transformation *xform), UNUSED(struct tapebuf *bin),
UNUSED(unsigned long *destlen))
{
return 0;
}
/*
* Start slave process
*/
static int
zlib_startDiskIOProcess(UNUSED(Transformation *xform))
{
return 0;
}
/*
* End slave process
*/
static int
zlib_endDiskIOProcess(Transformation *xform)
{
if (xform != NULL) {
free(xform);
}
return 0;
}
struct req {
ext2_loff_t dblk;
int count;
};
/*
* Compress a buffer.
*/
static int
zlib_compress(TRANSFORM_UNUSED(Transformation *xform), TRANSFORM_UNUSED(struct tapebuf *tpbin),
TRANSFORM_UNUSED(unsigned long *destlen), TRANSFORM_UNUSED(const char *src), TRANSFORM_UNUSED(int srclen))
{
#ifdef HAVE_ZLIB
int compresult;
compresult = compress2((unsigned char*)tpbin->buf, destlen, (const unsigned char*)src, srclen, xform->state.zlib.complvl);
return compresult == Z_OK ? 1 : 0;
#else
return 1;
#endif /* HAVE_ZLIB */
}
/*
* Decompress a buffer.
*/
static int
zlib_decompress(UNUSED(Transformation *xform), TRANSFORM_UNUSED(struct tapebuf *tpbin),
TRANSFORM_UNUSED(unsigned long *destlen), TRANSFORM_UNUSED(const char *src), TRANSFORM_UNUSED(int srclen), TRANSFORM_UNUSED(char **reason))
{
#ifdef HAVE_ZLIB
int cresult;
cresult = uncompress((unsigned char*)tpbin->buf, destlen, (const unsigned char*)src, srclen);
switch (cresult) {
case Z_OK:
*reason = "";
break;
case Z_MEM_ERROR:
*reason = "not enough memory";
break;
case Z_BUF_ERROR:
*reason = "buffer too small";
break;
case Z_DATA_ERROR:
*reason = "data error";
break;
default:
*reason = "unknown";
}
return (cresult == Z_OK) ? 1 : 0;
#else
return 1;
#endif /* HAVE_ZLIB */
}
/*
* Factory
*/
Transformation
*transformation_zlib_factory(int enc, TRANSFORM_UNUSED(int complvl))
{
Transformation *t = (Transformation *) malloc(sizeof (Transformation));
t->enc = enc;
#ifdef HAVE_ZLIB
t->state.zlib.complvl = complvl;
#endif
t->name = "zlib";
t->mandatory = 0;
t->initialize = &zlib_initialize;
t->shutdown = &zlib_shutdown;
t->startNewTape = &zlib_startNewTape;
t->startDiskIOProcess = &zlib_startDiskIOProcess;
t->endDiskIOProcess = &zlib_endDiskIOProcess;
t->compress = &zlib_compress;
t->decompress = &zlib_decompress;
return t;
}
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