libStatGen Software 1
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GzipHeader.h
1/*
2 * Copyright (C) 2010 Regents of the University of Michigan
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#ifndef __GZIPHEADER_H__
19#define __GZIPHEADER_H__
20
21#include <stdint.h>
22#include <stdio.h>
23#include "UncompressedFileType.h"
24
26{
27public:
28 GzipHeader();
30
31 // Method to read the gzip header from a file.
32 // Returns true if the file is a gzip file, false, otherwise.
33 bool readHeader(FILE* filePtr);
34
35 // Method to read the gzip header from a file of UncompresedFileType.
36 // Returns true if the file is a gzip file, false, otherwise.
37 bool readHeader(UncompressedFileType& file);
38
39 // Determine if the file is a gzip file.
40 bool isGzipFile();
41
42 // Determine if the file is a BGZF compressed file.
43 bool isBgzfFile();
44
45private:
46
47 static const unsigned int GZIP_HEADER_SIZE = 18;
48
49 union
50 {
51 struct
52 {
53 uint8_t id1;
54 uint8_t id2;
55 uint8_t cm;
56 uint8_t flg;
57 uint32_t mtime;
58 uint8_t xfl;
59 uint8_t os;
60 uint16_t xlen;
61 uint8_t si1;
62 uint8_t si2;
63 uint16_t slen;
64 uint16_t bsize;
65 };
66 char headerBuffer[GzipHeader::GZIP_HEADER_SIZE];
67 };
68 char buffer[GZIP_HEADER_SIZE];
69
70};
71
72
73#endif