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/*
* Copyright (C) 2010 Regents of the University of Michigan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __GZIPHEADER_H__
#define __GZIPHEADER_H__
#include <stdint.h>
#include <stdio.h>
#include "UncompressedFileType.h"
class GzipHeader
{
public:
GzipHeader();
~GzipHeader();
// Method to read the gzip header from a file.
// Returns true if the file is a gzip file, false, otherwise.
bool readHeader(FILE* filePtr);
// Method to read the gzip header from a file of UncompresedFileType.
// Returns true if the file is a gzip file, false, otherwise.
bool readHeader(UncompressedFileType& file);
// Determine if the file is a gzip file.
bool isGzipFile();
// Determine if the file is a BGZF compressed file.
bool isBgzfFile();
private:
static const unsigned int GZIP_HEADER_SIZE = 18;
union
{
struct
{
uint8_t id1;
uint8_t id2;
uint8_t cm;
uint8_t flg;
uint32_t mtime;
uint8_t xfl;
uint8_t os;
uint16_t xlen;
uint8_t si1;
uint8_t si2;
uint16_t slen;
uint16_t bsize;
};
char headerBuffer[GzipHeader::GZIP_HEADER_SIZE];
};
char buffer[GZIP_HEADER_SIZE];
};
#endif
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