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1 | /* |
2 | * Copyright (c) 2001, Robert Collins. | |
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 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * A copy of the GNU General Public License can be found at | |
10 | * http://www.gnu.org/ | |
11 | * | |
12 | * Written by Robert Collins <rbtcollins@hotmail.com> | |
13 | * | |
14 | */ | |
15 | ||
c93bc6d0 MB |
16 | #ifndef SETUP_COMPRESS_GZ_H |
17 | #define SETUP_COMPRESS_GZ_H | |
b24c88b3 RC |
18 | |
19 | /* this is the parent class for all compress IO operations. | |
20 | * It | |
21 | */ | |
22 | ||
23 | class compress_gz:public compress | |
24 | { | |
25 | public: | |
26 | /* assumes decompression */ | |
27 | compress_gz (io_stream *); | |
28 | /* the mode allows control, but this implementation only does compression */ | |
29 | compress_gz (io_stream *, const char *); | |
30 | /* read data (duh!) */ | |
31 | virtual ssize_t read (void *buffer, size_t len); | |
32 | /* provide data to (double duh!) */ | |
ca9506cc | 33 | virtual ssize_t write (const void *buffer, size_t len); |
b24c88b3 RC |
34 | /* read data without removing it from the class's internal buffer */ |
35 | virtual ssize_t peek (void *buffer, size_t len); | |
36 | virtual long tell (); | |
ca9506cc | 37 | virtual int seek (long where, io_stream_seek_t whence); |
b24c88b3 RC |
38 | /* try guessing this one */ |
39 | virtual int error (); | |
40 | /* Find out the next stream name - | |
41 | * ie for foo.tar.gz, at offset 0, next_file_name = foo.tar | |
42 | * for foobar that is an compress, next_file_name is the next | |
43 | * extractable filename. | |
44 | */ | |
45 | virtual const char *next_file_name () | |
46 | { | |
47 | return NULL; | |
48 | }; | |
49 | virtual int set_mtime (int); | |
50 | virtual int get_mtime (); | |
341988b9 RC |
51 | /* Use seek EOF, then tell (). get_size won't do this incase you are sucking down |
52 | * over a WAN :} */ | |
53 | virtual size_t get_size () {return 0;}; | |
b24c88b3 | 54 | /* if you are still needing these hints... give up now! */ |
341988b9 | 55 | virtual ~ compress_gz (); |
b24c88b3 RC |
56 | private: |
57 | compress_gz () | |
58 | { | |
59 | }; | |
60 | char peekbuf[512]; | |
61 | size_t peeklen; | |
62 | void construct (io_stream *, const char *); | |
63 | void check_header (); | |
64 | int get_byte (); | |
65 | unsigned long getLong (); | |
66 | void putLong (unsigned long); | |
67 | void destroy (); | |
68 | int do_flush (int); | |
69 | io_stream *original; | |
70 | /* from zlib */ | |
71 | z_stream stream; | |
72 | int z_err; /* error code for last stream operation */ | |
73 | int z_eof; /* set if end of input file */ | |
74 | unsigned char *inbuf; /* input buffer */ | |
75 | unsigned char *outbuf; /* output buffer */ | |
76 | uLong crc; /* crc32 of uncompressed data */ | |
77 | char *msg; /* error message */ | |
78 | int transparent; /* 1 if input file is not a .gz file */ | |
79 | char mode; /* 'w' or 'r' */ | |
80 | long startpos; /* start of compressed data in file (header skipped) */ | |
81 | }; | |
82 | ||
c93bc6d0 | 83 | #endif /* SETUP_COMPRESS_GZ_H */ |