c3dcdeb1d2
Change-Id: Idec97093ca48c14b825c7b87ec050cc99aadc526
325 lines
9.2 KiB
C++
325 lines
9.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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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.hxx"
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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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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 = static_cast<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 = nullptr;
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s->stream.zfree = nullptr;
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s->stream.opaque = nullptr;
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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 = nullptr;
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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 = static_cast<Byte *>(ALLOC(Z_BUFSIZE));
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if (err != Z_OK || s->inbuf == Z_NULL)
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{
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destroy(s);
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return 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 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 successfully 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 != nullptr)
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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 = file;
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Bytef *start = static_cast<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 == nullptr)
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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 = static_cast<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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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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bool done = false;
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gz_stream *s = file;
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if (s == nullptr || 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 = (unsigned char) get_byte(s);
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x += ((unsigned char) get_byte(s)) << 8;
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x += ((unsigned char) get_byte(s)) << 16;
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x += ((unsigned char) get_byte(s)) << 24;
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if (s->z_eof)
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{
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s->z_err = Z_DATA_ERROR;
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}
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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 = file;
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if (s == nullptr)
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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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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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