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