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b24c88b3 RC |
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 | ||
16 | /* An individual stream from a tar archive. */ | |
17 | ||
18 | #if 0 | |
19 | static const char *cvsid = "\n%%% $Id$\n"; | |
20 | #endif | |
21 | ||
b24c88b3 | 22 | #include <errno.h> |
b34fb59f | 23 | #include <algorithm> |
b24c88b3 RC |
24 | |
25 | #include "zlib/zlib.h" | |
26 | #include "io_stream.h" | |
27 | #include "compress.h" | |
28 | #include "archive.h" | |
29 | #include "archive_tar.h" | |
30 | #include "log.h" | |
b24c88b3 RC |
31 | |
32 | #include "port.h" | |
33 | ||
34 | archive_tar_file::archive_tar_file (tar_state & newstate):state (newstate) | |
35 | { | |
36 | } | |
37 | ||
38 | archive_tar_file::~archive_tar_file () | |
39 | { | |
40 | state.header_read = 0; | |
e9440f0f | 41 | destroyed = 1; |
b24c88b3 RC |
42 | } |
43 | ||
44 | /* Virtual memebrs */ | |
45 | ssize_t archive_tar_file::read (void *buffer, size_t len) | |
46 | { | |
47 | /* how many bytes do we want to give the user */ | |
48 | int | |
b34fb59f | 49 | want = std::min (len, state.file_length - state.file_offset); |
b24c88b3 RC |
50 | /* how many do we need to read after that to line up the file pointer */ |
51 | int | |
52 | roundup = (512 - (want % 512)) % 512; | |
53 | if (want) | |
54 | { | |
55 | ssize_t | |
56 | got = state.parent->read (buffer, want); | |
57 | char | |
58 | throwaway[512]; | |
59 | ssize_t | |
60 | got2 = state.parent->read (throwaway, roundup); | |
61 | if (got == want && got2 == roundup) | |
62 | { | |
63 | state.file_offset += got; | |
64 | return got; | |
65 | } | |
66 | else | |
67 | { | |
68 | /* unexpected EOF or read error in the tar parent stream */ | |
69 | /* the user can query the parent for the error */ | |
70 | state.lasterr = EIO; | |
71 | return EIO; | |
72 | } | |
73 | } | |
74 | return 0; | |
75 | } | |
76 | ||
77 | /* provide data to (double duh!) */ | |
ca9506cc | 78 | ssize_t archive_tar_file::write (const void *buffer, size_t len) |
b24c88b3 RC |
79 | { |
80 | /* write not supported */ | |
81 | return EBADF; | |
82 | } | |
83 | ||
84 | /* read data without removing it from the class's internal buffer */ | |
85 | ssize_t archive_tar_file::peek (void *buffer, size_t len) | |
86 | { | |
87 | int | |
b34fb59f | 88 | want = std::min (len, state.file_length - state.file_offset); |
b24c88b3 RC |
89 | if (want) |
90 | { | |
91 | ssize_t | |
92 | got = state.parent->peek (buffer, want); | |
93 | if (got == want) | |
94 | { | |
95 | return got; | |
96 | } | |
97 | else | |
98 | { | |
99 | /* unexpected EOF or read error in the tar parent stream */ | |
100 | /* the user can query the parent for the error */ | |
101 | state.lasterr = EIO; | |
102 | return EIO; | |
103 | } | |
104 | } | |
105 | return 0; | |
106 | } | |
107 | ||
108 | long | |
109 | archive_tar_file::tell () | |
110 | { | |
111 | return state.file_offset; | |
112 | } | |
113 | ||
ca9506cc RC |
114 | int |
115 | archive_tar_file::seek (long where, io_stream_seek_t whence) | |
116 | { | |
117 | /* nothing needs seeking here yet. Implement when needed | |
118 | */ | |
119 | return -1; | |
120 | } | |
121 | ||
b24c88b3 RC |
122 | /* try guessing this one */ |
123 | int | |
124 | archive_tar_file::error () | |
125 | { | |
126 | return state.lasterr; | |
127 | } | |
128 | ||
129 | int | |
130 | archive_tar_file::get_mtime () | |
131 | { | |
132 | int mtime; | |
133 | sscanf (state.tar_header.mtime, "%o", &mtime); | |
134 | return mtime; | |
135 | } |