[BACK]Return to uncompr.c CVS log [TXT][DIR] Up to [cvs.NetBSD.org] / pkgsrc / devel / zlib / files

File: [cvs.NetBSD.org] / pkgsrc / devel / zlib / files / uncompr.c (download)

Revision 1.5, Tue Apr 4 08:57:33 2017 UTC (3 years, 5 months ago) by adam
Branch: MAIN
CVS Tags: pkgsrc-2020Q2-base, pkgsrc-2020Q2, pkgsrc-2020Q1-base, pkgsrc-2020Q1, pkgsrc-2019Q4-base, pkgsrc-2019Q4, pkgsrc-2019Q3-base, pkgsrc-2019Q3, pkgsrc-2019Q2-base, pkgsrc-2019Q2, pkgsrc-2019Q1-base, pkgsrc-2019Q1, pkgsrc-2018Q4-base, pkgsrc-2018Q4, pkgsrc-2018Q3-base, pkgsrc-2018Q3, pkgsrc-2018Q2-base, pkgsrc-2018Q2, pkgsrc-2018Q1-base, pkgsrc-2018Q1, pkgsrc-2017Q4-base, pkgsrc-2017Q4, pkgsrc-2017Q3-base, pkgsrc-2017Q3, pkgsrc-2017Q2-base, pkgsrc-2017Q2, HEAD
Changes since 1.4: +67 -33 lines

Changes in 1.2.11 (15 Jan 2017)
- Fix deflate stored bug when pulling last block from window
- Permit immediate deflateParams changes before any deflate input

Changes in 1.2.10 (2 Jan 2017)
- Avoid warnings on snprintf() return value
- Fix bug in deflate_stored() for zero-length input
- Fix bug in gzwrite.c that produced corrupt gzip files
- Remove files to be installed before copying them in Makefile.in
- Add warnings when compiling with assembler code

Changes in 1.2.9 (31 Dec 2016)
- Fix contrib/minizip to permit unzipping with desktop API [Zouzou]
- Improve contrib/blast to return unused bytes
- Assure that gzoffset() is correct when appending
- Improve compress() and uncompress() to support large lengths
- Fix bug in test/example.c where error code not saved
- Remedy Coverity warning [Randers-Pehrson]
- Improve speed of gzprintf() in transparent mode
- Fix inflateInit2() bug when windowBits is 16 or 32
- Change DEBUG macro to ZLIB_DEBUG
- Avoid uninitialized access by gzclose_w()
- Allow building zlib outside of the source directory
- Fix bug that accepted invalid zlib header when windowBits is zero
- Fix gzseek() problem on MinGW due to buggy _lseeki64 there
- Loop on write() calls in gzwrite.c in case of non-blocking I/O
- Add --warn (-w) option to ./configure for more compiler warnings
- Reject a window size of 256 bytes if not using the zlib wrapper
- Fix bug when level 0 used with Z_HUFFMAN or Z_RLE
- Add --debug (-d) option to ./configure to define ZLIB_DEBUG
- Fix bugs in creating a very large gzip header
- Add uncompress2() function, which returns the input size used
- Assure that deflateParams() will not switch functions mid-block
- Dramatically speed up deflation for level 0 (storing)
- Add gzfread(), duplicating the interface of fread()
- Add gzfwrite(), duplicating the interface of fwrite()
- Add deflateGetDictionary() function
- Use snprintf() for later versions of Microsoft C
- Fix *Init macros to use z_ prefix when requested
- Replace as400 with os400 for OS/400 support [Monnerat]
- Add crc32_z() and adler32_z() functions with size_t lengths
- Update Visual Studio project files [AraHaan]

/* 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 1.5 2017/04/04 08:57:33 adam Exp $ */

#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;

    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 :

int ZEXPORT uncompress (dest, destLen, source, sourceLen)
    Bytef *dest;
    uLongf *destLen;
    const Bytef *source;
    uLong sourceLen;
    return uncompress2(dest, destLen, source, &sourceLen);