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b24c88b3 | 1 | /* |
19911586 | 2 | * Copyright (c) 2001, 2002, Robert Collins. |
b24c88b3 RC |
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 | /* this is the parent class for all IO operations. It's flexable enough to be cover for | |
17 | * HTTP access, local file access, and files being extracted from archives. | |
18 | * It also encapsulates the idea of an archive, and all non-archives become the special | |
19 | * case. | |
20 | */ | |
21 | ||
bf4ffcd9 | 22 | #include "LogSingleton.h" |
b24c88b3 RC |
23 | |
24 | #include "io_stream.h" | |
a3a02820 | 25 | |
19911586 RC |
26 | #include <stdexcept> |
27 | #include "IOStreamProvider.h" | |
080bec6e | 28 | #include <map> |
a3a02820 | 29 | #include "String++.h" |
19911586 | 30 | |
155eacb6 | 31 | typedef std::map <std::string, IOStreamProvider *, casecompare_lt_op> providersType; |
080bec6e | 32 | static providersType *providers; |
19911586 RC |
33 | static size_t longestPrefix = 0; |
34 | static int inited = 0; | |
35 | ||
36 | void | |
37 | io_stream::registerProvider (IOStreamProvider &theProvider, | |
a3a02820 | 38 | const std::string& urlPrefix) |
19911586 RC |
39 | { |
40 | if (!inited) | |
41 | { | |
080bec6e | 42 | providers = new providersType; |
19911586 RC |
43 | inited = true; |
44 | } | |
45 | theProvider.key = urlPrefix; | |
080bec6e | 46 | if (providers->find (urlPrefix) != providers->end()) |
155eacb6 | 47 | throw new std::invalid_argument ("urlPrefix already registered!"); |
080bec6e | 48 | (*providers)[urlPrefix] = &theProvider; |
19911586 RC |
49 | if (urlPrefix.size() > longestPrefix) |
50 | longestPrefix = urlPrefix.size(); | |
51 | } | |
52 | ||
53 | static IOStreamProvider const * | |
a3a02820 | 54 | findProvider (const std::string& path) |
19911586 RC |
55 | { |
56 | if (path.size() < longestPrefix) | |
57 | return NULL; | |
080bec6e RC |
58 | for (providersType::const_iterator i = providers->begin(); |
59 | i != providers->end(); ++i) | |
19911586 | 60 | { |
afa76033 | 61 | if (!casecompare(path, i->first, i->first.size())) |
080bec6e | 62 | return i->second; |
19911586 RC |
63 | } |
64 | return NULL; | |
65 | } | |
b24c88b3 RC |
66 | |
67 | /* Static members */ | |
68 | io_stream * | |
69 | io_stream::factory (io_stream * parent) | |
70 | { | |
71 | /* something like, | |
72 | * if !next_file_name | |
73 | * return NULL | |
74 | * switch (magic_id(peek (parent), max_magic_length)) | |
75 | * case io_stream * foo = new tar | |
76 | * case io_stream * foo = new bz2 | |
77 | * return foo | |
78 | */ | |
157dc2b8 | 79 | Log (LOG_TIMESTAMP) << "io_stream::factory has been called" << endLog; |
b24c88b3 RC |
80 | return NULL; |
81 | } | |
82 | ||
3d3c6047 | 83 | #define url_scheme_not_registered(name) \ |
155eacb6 | 84 | throw new std::invalid_argument ((std::string("URL Scheme for '")+ \ |
3d3c6047 IP |
85 | name+"' not registered!").c_str()) |
86 | ||
b24c88b3 | 87 | io_stream * |
26922cd2 | 88 | io_stream::open (const std::string& name, const std::string& mode, mode_t perms) |
b24c88b3 | 89 | { |
19911586 RC |
90 | IOStreamProvider const *p = findProvider (name); |
91 | if (!p) | |
3d3c6047 | 92 | url_scheme_not_registered (name); |
26922cd2 | 93 | io_stream *rv = p->open (&name.c_str()[p->key.size()], mode, perms); |
19911586 RC |
94 | if (!rv->error ()) |
95 | return rv; | |
96 | delete rv; | |
b24c88b3 RC |
97 | return NULL; |
98 | } | |
99 | ||
100 | int | |
b41c2908 | 101 | io_stream::mkpath_p (path_type_t isadir, const std::string& name, mode_t mode) |
b24c88b3 | 102 | { |
19911586 RC |
103 | IOStreamProvider const *p = findProvider (name); |
104 | if (!p) | |
3d3c6047 | 105 | url_scheme_not_registered (name); |
b41c2908 | 106 | return p->mkdir_p (isadir, &name.c_str()[p->key.size()], mode); |
b24c88b3 RC |
107 | } |
108 | ||
109 | /* remove a file or directory. */ | |
110 | int | |
a3a02820 | 111 | io_stream::remove (const std::string& name) |
b24c88b3 | 112 | { |
19911586 RC |
113 | IOStreamProvider const *p = findProvider (name); |
114 | if (!p) | |
3d3c6047 | 115 | url_scheme_not_registered (name); |
d2a3615c | 116 | return p->remove (&name.c_str()[p->key.size()]); |
b24c88b3 RC |
117 | } |
118 | ||
119 | int | |
a3a02820 | 120 | io_stream::mklink (const std::string& from, const std::string& to, |
b24c88b3 RC |
121 | io_stream_link_t linktype) |
122 | { | |
157dc2b8 | 123 | Log (LOG_BABBLE) << "io_stream::mklink (" << from << "->" << to << ")" |
bf4ffcd9 | 124 | << endLog; |
19911586 RC |
125 | IOStreamProvider const *fromp = findProvider (from); |
126 | IOStreamProvider const *top = findProvider (to); | |
3d3c6047 IP |
127 | if (!fromp) |
128 | url_scheme_not_registered (from); | |
129 | if (!top) | |
130 | url_scheme_not_registered (to); | |
19911586 | 131 | if (fromp != top) |
155eacb6 | 132 | throw new std::invalid_argument ("Attempt to link across url providers."); |
d2a3615c MB |
133 | return fromp->mklink (&from.c_str()[fromp->key.size()], |
134 | &to.c_str()[top->key.size()], linktype); | |
7c7034e8 RC |
135 | } |
136 | ||
137 | int | |
a3a02820 | 138 | io_stream::move_copy (const std::string& from, const std::string& to) |
7c7034e8 RC |
139 | { |
140 | /* parameters are ok - checked before calling us, and we are private */ | |
26922cd2 CV |
141 | io_stream *in = io_stream::open (to, "wb", 0644); |
142 | io_stream *out = io_stream::open (from, "rb", 0); | |
341988b9 RC |
143 | if (io_stream::copy (in, out)) |
144 | { | |
157dc2b8 | 145 | Log (LOG_TIMESTAMP) << "Failed copy of " << from << " to " << to |
bf4ffcd9 | 146 | << endLog; |
341988b9 RC |
147 | delete out; |
148 | io_stream::remove (to); | |
149 | delete in; | |
150 | return 1; | |
151 | } | |
152 | /* TODO: | |
153 | out->set_mtime (in->get_mtime ()); | |
154 | */ | |
155 | delete in; | |
156 | delete out; | |
157 | io_stream::remove (from); | |
158 | return 0; | |
159 | } | |
160 | ||
df62e023 | 161 | ssize_t io_stream::copy (io_stream * in, io_stream * out) |
341988b9 RC |
162 | { |
163 | if (!in || !out) | |
164 | return -1; | |
df62e023 | 165 | char |
94dfd783 | 166 | buffer[65536]; |
df62e023 RC |
167 | ssize_t |
168 | countin, | |
169 | countout; | |
94dfd783 | 170 | while ((countin = in->read (buffer, sizeof(buffer))) > 0) |
7c7034e8 RC |
171 | { |
172 | countout = out->write (buffer, countin); | |
173 | if (countout != countin) | |
df62e023 | 174 | { |
157dc2b8 | 175 | Log (LOG_TIMESTAMP) << "io_stream::copy failed to write " |
bf4ffcd9 | 176 | << countin << " bytes" << endLog; |
df62e023 RC |
177 | return countout ? countout : -1; |
178 | } | |
7c7034e8 | 179 | } |
eb20d728 | 180 | |
9e9bdee2 JT |
181 | /* |
182 | Loop above ends with countin = 0 if we have reached EOF, or -1 if an | |
183 | read error occurred. | |
184 | */ | |
185 | if (countin < 0) | |
186 | return -1; | |
eb20d728 | 187 | |
9e9bdee2 | 188 | /* Here it would be nice to be able to do something like |
eb20d728 | 189 | TODO: |
7c7034e8 RC |
190 | out->set_mtime (in->get_mtime ()); |
191 | */ | |
7c7034e8 RC |
192 | return 0; |
193 | } | |
194 | ||
195 | int | |
a3a02820 | 196 | io_stream::move (const std::string& from, const std::string& to) |
7c7034e8 | 197 | { |
19911586 RC |
198 | IOStreamProvider const *fromp = findProvider (from); |
199 | IOStreamProvider const *top = findProvider (to); | |
3d3c6047 IP |
200 | if (!fromp) |
201 | url_scheme_not_registered (from); | |
202 | if (!top) | |
203 | url_scheme_not_registered (to); | |
19911586 RC |
204 | if (fromp != top) |
205 | return io_stream::move_copy (from, to); | |
d2a3615c MB |
206 | return fromp->move (&from.c_str()[fromp->key.size()], |
207 | &to.c_str()[top->key.size()]); | |
b24c88b3 RC |
208 | } |
209 | ||
210 | char * | |
211 | io_stream::gets (char *buffer, size_t length) | |
212 | { | |
213 | char *pos = buffer; | |
214 | size_t count = 0; | |
215 | while (count + 1 < length && read (pos, 1) == 1) | |
216 | { | |
217 | count++; | |
218 | pos++; | |
219 | if (*(pos - 1) == '\n') | |
220 | { | |
edef4f57 CV |
221 | --pos; /* end of line, remove from buffer */ |
222 | if (pos > buffer && *(pos - 1) == '\r') | |
223 | --pos; | |
b24c88b3 RC |
224 | break; |
225 | } | |
226 | } | |
227 | if (count == 0 || error ()) | |
228 | /* EOF when no chars found, or an error */ | |
229 | return NULL; | |
230 | *pos = '\0'; | |
231 | return buffer; | |
232 | } | |
233 | ||
234 | int | |
a3a02820 | 235 | io_stream::exists (const std::string& name) |
b24c88b3 | 236 | { |
19911586 RC |
237 | IOStreamProvider const *p = findProvider (name); |
238 | if (!p) | |
3d3c6047 | 239 | url_scheme_not_registered (name); |
d2a3615c | 240 | return p->exists (&name.c_str()[p->key.size()]); |
b24c88b3 RC |
241 | } |
242 | ||
243 | /* virtual members */ | |
244 | ||
6b68e703 | 245 | io_stream::~io_stream () {} |