diff options
Diffstat (limited to 'hwpfilter/source/hgzip.cpp')
-rw-r--r-- | hwpfilter/source/hgzip.cpp | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/hwpfilter/source/hgzip.cpp b/hwpfilter/source/hgzip.cpp new file mode 100644 index 000000000000..93aa889cfcaa --- /dev/null +++ b/hwpfilter/source/hgzip.cpp @@ -0,0 +1,337 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +#include "precompile.h" + +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <errno.h> +#include "hgzip.h" +#include "hstream.h" + +#ifndef local +# define local static +#endif + +#define Z_BUFSIZE (1024 * 4) + +#define ALLOC(size) malloc(size) +#define TRYFREE(p) {if (p) free(p);} + +#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */ +#define HEAD_CRC 0x02 /* bit 1 set: header CRC present */ +#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ +#define ORIG_NAME 0x08 /* bit 3 set: original file name present */ +#define COMMENT 0x10 /* bit 4 set: file comment present */ +#define RESERVED 0xE0 /* bits 5..7: reserved */ + +local int get_byte(gz_stream * s); +local int destroy(gz_stream * s); +local uLong getLong(gz_stream * s); + +/* =========================================================================== + Opens a gzip (.gz) file for reading or writing. The mode parameter + is as in fopen ("rb" or "wb"). The file is given either by file descriptor + or path name (if fd == -1). + gz_open return NULL if the file could not be opened or if there was + insufficient memory to allocate the (de)compression state; errno + can be checked to distinguish the two cases (if errno is zero, the + zlib error is Z_MEM_ERROR). +*/ +gz_stream *gz_open(HStream & _stream) +{ + int err; + //int level = Z_DEFAULT_COMPRESSION; /* compression level */ + +// char *p = (char*)mode; + //char fmode[80]; /* copy of mode, without the compression level */ + //char *m = fmode; + gz_stream *s; + + s = (gz_stream *) ALLOC(sizeof(gz_stream)); + if (!s) + return Z_NULL; + s->stream.zalloc = (alloc_func) 0; + s->stream.zfree = (free_func) 0; + s->stream.opaque = (voidpf) 0; + s->stream.next_in = s->inbuf = Z_NULL; + s->stream.next_out = s->outbuf = Z_NULL; + s->stream.avail_in = s->stream.avail_out = 0; +//s->_inputstream = NULL; + s->z_err = Z_OK; + s->z_eof = 0; + s->crc = crc32(0L, Z_NULL, 0); + s->msg = NULL; + s->transparent = 0; + + s->mode = 'r'; + +//realking + err = inflateInit2(&(s->stream), -MAX_WBITS); + s->stream.next_in = s->inbuf = (Byte *) ALLOC(Z_BUFSIZE); + + if (err != Z_OK || s->inbuf == Z_NULL) + { + return destroy(s), (gz_stream *) Z_NULL; + } + + s->stream.avail_out = Z_BUFSIZE; + + errno = 0; + s->_inputstream = &_stream; + + return (gz_stream *) s; +} + + +/* =========================================================================== + Read a byte from a gz_stream; update next_in and avail_in. Return EOF + for end of file. + IN assertion: the stream s has been sucessfully opened for reading. +*/ +local int get_byte(gz_stream * s) +{ + if (s->z_eof) + return EOF; + if (s->stream.avail_in == 0) + { + errno = 0; + + s->stream.avail_in = s->_inputstream->readBytes(s->inbuf, Z_BUFSIZE); + if (s->stream.avail_in == 0) + { + s->z_eof = 1; + return EOF; + } + s->stream.next_in = s->inbuf; + } + s->stream.avail_in--; + return *(s->stream.next_in)++; +} + + +/* =========================================================================== + * Cleanup then free the given gz_stream. Return a zlib error code. + * Try freeing in the reverse order of allocations. + */ +local int destroy(gz_stream * s) +{ + int err = Z_OK; + + if (!s) + return Z_STREAM_ERROR; + + TRYFREE(s->msg); + + if (s->stream.state != NULL) + { + err = inflateEnd(&(s->stream)); + } + if (s->z_err < 0) + err = s->z_err; + + TRYFREE(s->inbuf); + TRYFREE(s->outbuf); + TRYFREE(s); + return err; +} + + +// typedef unsigned char Byte +// typedef Byte FAR Bytef; +/* =========================================================================== + Reads the given number of uncompressed bytes from the compressed file. + gz_read returns the number of bytes actually read (0 for end of file). +*/ +int gz_read(gz_stream * file, voidp buf, unsigned len) +{ +//printf("@@ gz_read : len : %d\t",len); + gz_stream *s = (gz_stream *) file; + Bytef *start = (Bytef *) buf; /* starting point for crc computation */ + Byte *next_out; /* == stream.next_out but not forced far (for MSDOS) */ + if (s == NULL) + return Z_STREAM_ERROR; + + if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) + return -1; + if (s->z_err == Z_STREAM_END) + return 0; /* EOF */ + + s->stream.next_out = next_out = (Bytef *) buf; + s->stream.avail_out = len; + + while (s->stream.avail_out != 0) + { + if (s->transparent) + { +/* Copy first the lookahead bytes: */ + uInt n = s->stream.avail_in; + + if (n > s->stream.avail_out) + n = s->stream.avail_out; + if (n > 0) + { + memcpy(s->stream.next_out, s->stream.next_in, n); + next_out += n; + s->stream.next_out = next_out; + s->stream.next_in += n; + s->stream.avail_out -= n; + s->stream.avail_in -= n; + } + if (s->stream.avail_out > 0) + { + s->stream.avail_out -= + s->_inputstream->readBytes(next_out, s->stream.avail_out); + } + return (int) (len - s->stream.avail_out); + } + if (s->stream.avail_in == 0 && !s->z_eof) + { + + errno = 0; + s->stream.avail_in = s->_inputstream->readBytes(s->inbuf, Z_BUFSIZE); + if (s->stream.avail_in == 0) + { + s->z_eof = 1; + break; + } + s->stream.next_in = s->inbuf; + } + s->z_err = inflate(&(s->stream), Z_NO_FLUSH); + + if (s->z_err == Z_STREAM_END) + { +/* Check CRC and original size */ + s->crc = crc32(s->crc, start, (uInt) (s->stream.next_out - start)); + start = s->stream.next_out; + + if (getLong(s) != s->crc || getLong(s) != s->stream.total_out) + { + s->z_err = Z_DATA_ERROR; + } + else if (s->z_err == Z_OK) + { + inflateReset(&(s->stream)); + s->crc = crc32(0L, Z_NULL, 0); + } + } + if (s->z_err != Z_OK || s->z_eof) + break; + } + s->crc = crc32(s->crc, start, (uInt) (s->stream.next_out - start)); + return (int) (len - s->stream.avail_out); +} + +/* =========================================================================== + Flushes all pending output into the compressed file. The parameter + flush is as in the deflate() function. + gz_flush should be called only when strictly necessary because it can + degrade compression. +*/ +int gz_flush(gz_stream * file, int flush) +{ + uInt len; + int done = 0; + gz_stream *s = (gz_stream *) file; + + if (s == NULL || s->mode != 'w') + return Z_STREAM_ERROR; + + s->stream.avail_in = 0; /* should be zero already anyway */ + + for (;;) + { + len = Z_BUFSIZE - s->stream.avail_out; + if (len != 0) + { +/* + if ((uInt)fwrite(s->outbuf, 1, len, s->file) != len) { + s->z_err = Z_ERRNO; + return Z_ERRNO; + } + */ + s->stream.next_out = s->outbuf; + s->stream.avail_out = Z_BUFSIZE; + } + if (done) + break; + s->z_err = deflate(&(s->stream), flush); + +/* deflate has finished flushing only when it hasn't used up + * all the available space in the output buffer: + */ + done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END); + + if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) + break; + } + return s->z_err == Z_STREAM_END ? Z_OK : s->z_err; +} + + +/* =========================================================================== + Reads a long in LSB order from the given gz_stream. Sets +*/ +local uLong getLong(gz_stream * s) +{ + uLong x = (uLong) get_byte(s); + int c; + + x += ((uLong) get_byte(s)) << 8; + x += ((uLong) get_byte(s)) << 16; + c = get_byte(s); + if (c == EOF) + s->z_err = Z_DATA_ERROR; + x += ((uLong) c) << 24; + return x; +} + + +/* =========================================================================== + Flushes all pending output if necessary, closes the compressed file + and deallocates all the (de)compression state. +*/ +int gz_close(gz_stream * file) +{ +// int err; + gz_stream *s = (gz_stream *) file; + + if (s == NULL) + return Z_STREAM_ERROR; +#if 0 + if (s->mode == 'w') + { + err = gz_flush(file, Z_FINISH); + if (err != Z_OK) + return destroy(s); + putLong(s->file, s->crc); + putLong(s->file, s->stream.total_in); + } +#endif + return destroy(s); +} |