ff25a38934
2008/03/28 15:36:38 rt 1.3.42.1: #i87441# Change license header to LPGL v3.
392 lines
11 KiB
C++
392 lines
11 KiB
C++
/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2008 by Sun Microsystems, Inc.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* $RCSfile: hgzip.cpp,v $
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* $Revision: 1.4 $
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#include "precompile.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "hgzip.h"
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#include "hstream.h"
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#ifndef local
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# define local static
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#endif
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#define Z_BUFSIZE (1024 * 4)
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#define ALLOC(size) malloc(size)
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#define TRYFREE(p) {if (p) free(p);}
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#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
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#define HEAD_CRC 0x02 /* bit 1 set: header CRC present */
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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#define COMMENT 0x10 /* bit 4 set: file comment present */
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#define RESERVED 0xE0 /* bits 5..7: reserved */
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local int get_byte(gz_stream * s);
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local int destroy(gz_stream * s);
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local uLong getLong(gz_stream * s);
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/* ===========================================================================
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Opens a gzip (.gz) file for reading or writing. The mode parameter
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is as in fopen ("rb" or "wb"). The file is given either by file descriptor
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or path name (if fd == -1).
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gz_open return NULL if the file could not be opened or if there was
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insufficient memory to allocate the (de)compression state; errno
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can be checked to distinguish the two cases (if errno is zero, the
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zlib error is Z_MEM_ERROR).
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*/
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gz_stream *gz_open(HStream & _stream)
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{
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int err;
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//int level = Z_DEFAULT_COMPRESSION; /* compression level */
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// char *p = (char*)mode;
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//char fmode[80]; /* copy of mode, without the compression level */
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//char *m = fmode;
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gz_stream *s;
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s = (gz_stream *) ALLOC(sizeof(gz_stream));
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if (!s)
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return Z_NULL;
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s->stream.zalloc = (alloc_func) 0;
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s->stream.zfree = (free_func) 0;
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s->stream.opaque = (voidpf) 0;
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s->stream.next_in = s->inbuf = Z_NULL;
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s->stream.next_out = s->outbuf = Z_NULL;
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s->stream.avail_in = s->stream.avail_out = 0;
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//s->_inputstream = NULL;
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s->z_err = Z_OK;
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s->z_eof = 0;
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s->crc = crc32(0L, Z_NULL, 0);
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s->msg = NULL;
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s->transparent = 0;
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s->mode = 'r';
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//realking
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err = inflateInit2(&(s->stream), -MAX_WBITS);
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s->stream.next_in = s->inbuf = (Byte *) ALLOC(Z_BUFSIZE);
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if (err != Z_OK || s->inbuf == Z_NULL)
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{
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return destroy(s), (gz_stream *) Z_NULL;
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}
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s->stream.avail_out = Z_BUFSIZE;
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errno = 0;
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s->_inputstream = &_stream;
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return (gz_stream *) s;
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}
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/* ===========================================================================
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Read a byte from a gz_stream; update next_in and avail_in. Return EOF
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for end of file.
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IN assertion: the stream s has been sucessfully opened for reading.
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*/
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local int get_byte(gz_stream * s)
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{
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if (s->z_eof)
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return EOF;
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if (s->stream.avail_in == 0)
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{
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errno = 0;
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s->stream.avail_in = s->_inputstream->readBytes(s->inbuf, Z_BUFSIZE);
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if (s->stream.avail_in == 0)
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{
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s->z_eof = 1;
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return EOF;
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}
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s->stream.next_in = s->inbuf;
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}
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s->stream.avail_in--;
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return *(s->stream.next_in)++;
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}
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/* ===========================================================================
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* Cleanup then free the given gz_stream. Return a zlib error code.
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* Try freeing in the reverse order of allocations.
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*/
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local int destroy(gz_stream * s)
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{
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int err = Z_OK;
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if (!s)
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return Z_STREAM_ERROR;
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TRYFREE(s->msg);
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if (s->stream.state != NULL)
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{
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err = inflateEnd(&(s->stream));
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}
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if (s->z_err < 0)
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err = s->z_err;
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TRYFREE(s->inbuf);
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TRYFREE(s->outbuf);
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TRYFREE(s);
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return err;
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}
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// typedef unsigned char Byte
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// typedef Byte FAR Bytef;
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/* ===========================================================================
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Reads the given number of uncompressed bytes from the compressed file.
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gz_read returns the number of bytes actually read (0 for end of file).
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*/
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int gz_read(gz_stream * file, voidp buf, unsigned len)
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{
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//printf("@@ gz_read : len : %d\t",len);
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gz_stream *s = (gz_stream *) file;
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Bytef *start = (Bytef *) buf; /* starting point for crc computation */
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Byte *next_out; /* == stream.next_out but not forced far (for MSDOS) */
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if (s == NULL)
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return Z_STREAM_ERROR;
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if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO)
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return -1;
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if (s->z_err == Z_STREAM_END)
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return 0; /* EOF */
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s->stream.next_out = next_out = (Bytef *) buf;
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s->stream.avail_out = len;
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while (s->stream.avail_out != 0)
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{
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if (s->transparent)
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{
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/* Copy first the lookahead bytes: */
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uInt n = s->stream.avail_in;
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if (n > s->stream.avail_out)
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n = s->stream.avail_out;
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if (n > 0)
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{
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memcpy(s->stream.next_out, s->stream.next_in, n);
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next_out += n;
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s->stream.next_out = next_out;
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s->stream.next_in += n;
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s->stream.avail_out -= n;
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s->stream.avail_in -= n;
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}
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if (s->stream.avail_out > 0)
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{
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s->stream.avail_out -=
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s->_inputstream->readBytes(next_out, s->stream.avail_out);
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}
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return (int) (len - s->stream.avail_out);
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}
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if (s->stream.avail_in == 0 && !s->z_eof)
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{
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errno = 0;
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s->stream.avail_in = s->_inputstream->readBytes(s->inbuf, Z_BUFSIZE);
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if (s->stream.avail_in == 0)
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{
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s->z_eof = 1;
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break;
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}
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s->stream.next_in = s->inbuf;
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}
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s->z_err = inflate(&(s->stream), Z_NO_FLUSH);
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if (s->z_err == Z_STREAM_END)
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{
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/* Check CRC and original size */
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s->crc = crc32(s->crc, start, (uInt) (s->stream.next_out - start));
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start = s->stream.next_out;
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if (getLong(s) != s->crc || getLong(s) != s->stream.total_out)
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{
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s->z_err = Z_DATA_ERROR;
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}
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else if (s->z_err == Z_OK)
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{
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inflateReset(&(s->stream));
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s->crc = crc32(0L, Z_NULL, 0);
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}
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}
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if (s->z_err != Z_OK || s->z_eof)
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break;
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}
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s->crc = crc32(s->crc, start, (uInt) (s->stream.next_out - start));
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return (int) (len - s->stream.avail_out);
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}
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/* ===========================================================================
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Writes the given number of uncompressed bytes into the compressed file.
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gzwrite returns the number of bytes actually written (0 in case of error).
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*/
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int gz_write(gz_stream * file, const voidp buf, unsigned len)
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{
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gz_stream *s = (gz_stream *) file;
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if (s == NULL || s->mode != 'w')
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return Z_STREAM_ERROR;
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s->stream.next_in = (Bytef *) buf;
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s->stream.avail_in = len;
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while (s->stream.avail_in != 0)
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{
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if (s->stream.avail_out == 0)
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{
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s->stream.next_out = s->outbuf;
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/*
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if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
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s->z_err = Z_ERRNO;
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break;
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}
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*/
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s->stream.avail_out = Z_BUFSIZE;
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}
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s->z_err = deflate(&(s->stream), Z_NO_FLUSH);
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if (s->z_err != Z_OK)
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break;
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}
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s->crc = crc32(s->crc, (Bytef *) buf, len);
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return (int) (len - s->stream.avail_in);
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}
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/* ===========================================================================
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Flushes all pending output into the compressed file. The parameter
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flush is as in the deflate() function.
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gz_flush should be called only when strictly necessary because it can
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degrade compression.
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*/
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int gz_flush(gz_stream * file, int flush)
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{
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uInt len;
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int done = 0;
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gz_stream *s = (gz_stream *) file;
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if (s == NULL || s->mode != 'w')
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return Z_STREAM_ERROR;
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s->stream.avail_in = 0; /* should be zero already anyway */
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for (;;)
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{
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len = Z_BUFSIZE - s->stream.avail_out;
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if (len != 0)
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{
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/*
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if ((uInt)fwrite(s->outbuf, 1, len, s->file) != len) {
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s->z_err = Z_ERRNO;
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return Z_ERRNO;
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}
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*/
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s->stream.next_out = s->outbuf;
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s->stream.avail_out = Z_BUFSIZE;
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}
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if (done)
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break;
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s->z_err = deflate(&(s->stream), flush);
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/* deflate has finished flushing only when it hasn't used up
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* all the available space in the output buffer:
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*/
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done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);
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if (s->z_err != Z_OK && s->z_err != Z_STREAM_END)
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break;
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}
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return s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
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}
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/* ===========================================================================
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Reads a long in LSB order from the given gz_stream. Sets
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*/
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local uLong getLong(gz_stream * s)
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{
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uLong x = (uLong) get_byte(s);
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int c;
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x += ((uLong) get_byte(s)) << 8;
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x += ((uLong) get_byte(s)) << 16;
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c = get_byte(s);
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if (c == EOF)
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s->z_err = Z_DATA_ERROR;
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x += ((uLong) c) << 24;
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return x;
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}
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/* ===========================================================================
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Flushes all pending output if necessary, closes the compressed file
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and deallocates all the (de)compression state.
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*/
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int gz_close(gz_stream * file)
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{
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// int err;
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gz_stream *s = (gz_stream *) file;
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if (s == NULL)
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return Z_STREAM_ERROR;
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#if 0
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if (s->mode == 'w')
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{
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err = gz_flush(file, Z_FINISH);
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if (err != Z_OK)
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return destroy(s);
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putLong(s->file, s->crc);
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putLong(s->file, s->stream.total_in);
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}
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#endif
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return destroy(s);
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}
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int gz_seek(gz_stream * , long , int )
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{
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return -1;
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}
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long gz_tell(gz_stream * )
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{
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return -1;
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}
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