| 0,0 → 1,85 |
|---|
| /* 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); |
| } |
| } |