Rev 219 | Rev 614 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | RSS feed
/* This file is part of the FDNPKG project. It is an adaptation of the
* "zpipe.c" example of zlib's inflate() and deflate() usage.
*
* Not copyrighted -- provided to the public domain
* original version 1.4 11 December 2005 Mark Adler
* adaptations for FDNPKG integration by Mateusz Viste, 2015
*/
#include <stdio.h>
#include <string.h>
#include "crc32.h"
#include "zlib\zlib.h"
#include "inf.h"
#define CHUNK 16384
/* Decompress from file source to file dest until stream ends or EOF.
* inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be allocated
* for processing, Z_DATA_ERROR if the deflate data is invalid or incomplete,
* Z_VERSION_ERROR if the version of zlib.h and the version of the library
* linked do not match, or Z_ERRNO if there is an error reading or writing the
* files. */
int inf(FILE *source, FILE *dest, unsigned char *buff32K, unsigned long *cksum, long streamlen) {
int ret;
unsigned int have;
z_stream strm;
unsigned char *in = buff32K;
unsigned char *out = buff32K + CHUNK;
/* allocate inflate state */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
ret = inflateInit2(&strm, -15); /* according to the zlib doc, passing -15 to inflateInit2() means "this is a raw deflate stream" (as opposed to a zlib- or gz- wrapped stream) */
if (ret != Z_OK) return(ret);
/* decompress until deflate stream ends or end of file */
do {
strm.avail_in = fread(in, 1, (streamlen > CHUNK ? CHUNK : streamlen), source);
if (ferror(source)) {
(void)inflateEnd(&strm);
return(Z_ERRNO);
}
streamlen -= strm.avail_in;
if (strm.avail_in == 0) break;
strm.next_in = in;
/* run inflate() on input until output buffer not full */
do {
strm.avail_out = CHUNK;
strm.next_out = out;
ret = inflate(&strm, Z_NO_FLUSH);
switch (ret) {
case Z_NEED_DICT:
ret = Z_DATA_ERROR; /* and fall through */
case Z_DATA_ERROR:
case Z_MEM_ERROR:
(void)inflateEnd(&strm);
return(ret);
}
have = CHUNK - strm.avail_out;
if ((fwrite(out, 1, have, dest) != have) || (ferror(dest))) {
(void)inflateEnd(&strm);
return(Z_ERRNO);
}
/* feed the CRC32 */
crc32_feed(cksum, out, have);
} while (strm.avail_out == 0);
/* done when inflate() says it's done */
} while (ret != Z_STREAM_END);
/* clean up and return */
(void)inflateEnd(&strm);
if (Z_STREAM_END) {
return(Z_OK);
} else {
return(Z_DATA_ERROR);
}
}