| /************************************************************** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| |
| /* $Id: hgzip.h,v 1.5 2008-06-04 09:57:59 vg Exp $ */ |
| |
| #ifndef _HWPGZIP_H_ |
| #define _HWPGZIP_H_ |
| |
| // DVO: add zlib/ prefix |
| #ifdef SYSTEM_ZLIB |
| #include <zlib.h> |
| #else |
| #include "zlib/zlib.h" |
| #endif |
| |
| class HStream; |
| /** |
| * @short Structure for using z_stream |
| */ |
| struct gz_stream |
| { |
| z_stream stream; |
| /** |
| * The error code of z_stream operation |
| */ |
| int z_err; |
| /** |
| * EOF of the input file |
| */ |
| int z_eof; |
| /** |
| * Stream |
| */ |
| HStream* _inputstream; |
| /** |
| * Input buffer |
| */ |
| Byte *inbuf; |
| /** |
| * Output buffer |
| */ |
| Byte *outbuf; |
| /** |
| * Crc32 of uncompressed data |
| */ |
| uLong crc; |
| /** |
| * Stream |
| */ |
| char *msg; |
| /** |
| * It becomes one when the input file type is not gz file |
| */ |
| int transparent; |
| /** |
| * 'w' or 'r' |
| */ |
| char mode; |
| }; |
| |
| /** |
| * Opens a gzipped stream for reading. |
| * gz_open returns NULL if the stream 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). |
| * @param _stream Reference of stream object having binary data. |
| */ |
| gz_stream *gz_open ( HStream& _stream ); |
| /** |
| * Flushes all pending output if necessary, closes the compressed stream |
| * and deallocates all the (de)compression state |
| */ |
| int gz_close ( gz_stream *file ); |
| /** |
| * Reads the given number of uncompressed bytes from the compressed stream |
| * @param file Gzipped stream |
| * @param buf Buffer to have the data to be read |
| * @param len Length of data to be read |
| * @returns The number of bytes actually read |
| */ |
| int gz_read ( gz_stream *file, voidp buf, unsigned len ); |
| /** |
| * Flushes all pending output into the compressed file |
| * gz_flush should be called only when strictly necessary because it can |
| * degrade compression |
| * @param flush Is as in the deflate() function |
| */ |
| int gz_flush ( gz_stream *file, int flush ); |
| #endif /* _HWPGZIP_H_ */ |