| /* uncompr.c -- decompress a memory buffer |
| * Copyright (C) 1995-2003, 2010, 2014, 2016 Jean-loup Gailly, Mark Adler |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| */ |
| |
| /* @(#) $Id: uncompr.c,v 1.1.1.2 2002/03/11 21:53:27 tromey Exp $ */ |
| |
| #define ZLIB_INTERNAL |
| #include "zlib.h" |
| |
| /* =========================================================================== |
| Decompresses the source buffer into the destination buffer. *sourceLen is |
| the byte length of the source buffer. Upon entry, *destLen is the total size |
| of the destination buffer, which must be large enough to hold the entire |
| uncompressed data. (The size of the uncompressed data must have been saved |
| previously by the compressor and transmitted to the decompressor by some |
| mechanism outside the scope of this compression library.) Upon exit, |
| *destLen is the size of the decompressed data and *sourceLen is the number |
| of source bytes consumed. Upon return, source + *sourceLen points to the |
| first unused input byte. |
| |
| uncompress returns Z_OK if success, Z_MEM_ERROR if there was not enough |
| memory, Z_BUF_ERROR if there was not enough room in the output buffer, or |
| Z_DATA_ERROR if the input data was corrupted, including if the input data is |
| an incomplete zlib stream. |
| */ |
| int ZEXPORT uncompress2 (dest, destLen, source, sourceLen) |
| Bytef *dest; |
| uLongf *destLen; |
| const Bytef *source; |
| uLong *sourceLen; |
| { |
| z_stream stream; |
| int err; |
| const uInt max = (uInt)-1; |
| uLong len, left; |
| Byte buf[1]; /* for detection of incomplete stream when *destLen == 0 */ |
| |
| len = *sourceLen; |
| if (*destLen) { |
| left = *destLen; |
| *destLen = 0; |
| } |
| else { |
| left = 1; |
| dest = buf; |
| } |
| |
| stream.next_in = (z_const Bytef *)source; |
| stream.avail_in = 0; |
| stream.zalloc = (alloc_func)0; |
| stream.zfree = (free_func)0; |
| stream.opaque = (voidpf)0; |
| |
| err = inflateInit(&stream); |
| if (err != Z_OK) return err; |
| |
| stream.next_out = dest; |
| stream.avail_out = 0; |
| |
| do { |
| if (stream.avail_out == 0) { |
| stream.avail_out = left > (uLong)max ? max : (uInt)left; |
| left -= stream.avail_out; |
| } |
| if (stream.avail_in == 0) { |
| stream.avail_in = len > (uLong)max ? max : (uInt)len; |
| len -= stream.avail_in; |
| } |
| err = inflate(&stream, Z_NO_FLUSH); |
| } while (err == Z_OK); |
| |
| *sourceLen -= len + stream.avail_in; |
| if (dest != buf) |
| *destLen = stream.total_out; |
| else if (stream.total_out && err == Z_BUF_ERROR) |
| left = 1; |
| |
| inflateEnd(&stream); |
| return err == Z_STREAM_END ? Z_OK : |
| err == Z_NEED_DICT ? Z_DATA_ERROR : |
| err == Z_BUF_ERROR && left + stream.avail_out ? Z_DATA_ERROR : |
| err; |
| } |
| |
| int ZEXPORT uncompress (dest, destLen, source, sourceLen) |
| Bytef *dest; |
| uLongf *destLen; |
| const Bytef *source; |
| uLong sourceLen; |
| { |
| return uncompress2(dest, destLen, source, &sourceLen); |
| } |