/src/mupdf/source/fitz/stream-open.c
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1 | | // Copyright (C) 2004-2024 Artifex Software, Inc. |
2 | | // |
3 | | // This file is part of MuPDF. |
4 | | // |
5 | | // MuPDF is free software: you can redistribute it and/or modify it under the |
6 | | // terms of the GNU Affero General Public License as published by the Free |
7 | | // Software Foundation, either version 3 of the License, or (at your option) |
8 | | // any later version. |
9 | | // |
10 | | // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY |
11 | | // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
12 | | // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more |
13 | | // details. |
14 | | // |
15 | | // You should have received a copy of the GNU Affero General Public License |
16 | | // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html> |
17 | | // |
18 | | // Alternative licensing terms are available from the licensor. |
19 | | // For commercial licensing, see <https://www.artifex.com/> or contact |
20 | | // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco, |
21 | | // CA 94129, USA, for further information. |
22 | | |
23 | | #define _LARGEFILE_SOURCE |
24 | | #ifndef _FILE_OFFSET_BITS |
25 | | #define _FILE_OFFSET_BITS 64 |
26 | | #endif |
27 | | |
28 | | #include "mupdf/fitz.h" |
29 | | |
30 | | #include <string.h> |
31 | | #include <errno.h> |
32 | | #include <stdio.h> |
33 | | |
34 | | #ifdef _WIN32 |
35 | | #include <windows.h> |
36 | | #include <wchar.h> |
37 | | #else |
38 | | #include <unistd.h> |
39 | | #endif |
40 | | |
41 | | int |
42 | | fz_file_exists(fz_context *ctx, const char *path) |
43 | 0 | { |
44 | 0 | FILE *file; |
45 | | #ifdef _WIN32 |
46 | | file = fz_fopen_utf8(path, "rb"); |
47 | | #else |
48 | 0 | file = fopen(path, "rb"); |
49 | 0 | #endif |
50 | 0 | if (file) |
51 | 0 | fclose(file); |
52 | 0 | return !!file; |
53 | 0 | } |
54 | | |
55 | | fz_stream * |
56 | | fz_new_stream(fz_context *ctx, void *state, fz_stream_next_fn *next, fz_stream_drop_fn *drop) |
57 | 815k | { |
58 | 815k | fz_stream *stm = NULL; |
59 | | |
60 | 1.63M | fz_try(ctx) |
61 | 1.63M | { |
62 | 815k | stm = fz_malloc_struct(ctx, fz_stream); |
63 | 815k | } |
64 | 1.63M | fz_catch(ctx) |
65 | 0 | { |
66 | 0 | if (drop) |
67 | 0 | drop(ctx, state); |
68 | 0 | fz_rethrow(ctx); |
69 | 0 | } |
70 | | |
71 | 815k | stm->refs = 1; |
72 | 815k | stm->error = 0; |
73 | 815k | stm->eof = 0; |
74 | 815k | stm->pos = 0; |
75 | | |
76 | 815k | stm->bits = 0; |
77 | 815k | stm->avail = 0; |
78 | | |
79 | 815k | stm->rp = NULL; |
80 | 815k | stm->wp = NULL; |
81 | | |
82 | 815k | stm->state = state; |
83 | 815k | stm->next = next; |
84 | 815k | stm->drop = drop; |
85 | 815k | stm->seek = NULL; |
86 | | |
87 | 815k | return stm; |
88 | 815k | } |
89 | | |
90 | | fz_stream * |
91 | | fz_keep_stream(fz_context *ctx, fz_stream *stm) |
92 | 777k | { |
93 | 777k | return fz_keep_imp(ctx, stm, &stm->refs); |
94 | 777k | } |
95 | | |
96 | | void |
97 | | fz_drop_stream(fz_context *ctx, fz_stream *stm) |
98 | 1.93M | { |
99 | 1.93M | if (fz_drop_imp(ctx, stm, &stm->refs)) |
100 | 815k | { |
101 | 815k | if (stm->drop) |
102 | 799k | stm->drop(ctx, stm->state); |
103 | 815k | fz_free(ctx, stm); |
104 | 815k | } |
105 | 1.93M | } |
106 | | |
107 | | /* File stream */ |
108 | | |
109 | | // TODO: WIN32: HANDLE CreateFileW(), etc. |
110 | | // TODO: POSIX: int creat(), read(), write(), lseeko, etc. |
111 | | |
112 | | typedef struct |
113 | | { |
114 | | FILE *file; |
115 | | char *filename; |
116 | | #ifdef _WIN32 |
117 | | wchar_t *filename_w; |
118 | | #endif |
119 | | int del_on_drop; |
120 | | unsigned char buffer[4096]; |
121 | | } fz_file_stream; |
122 | | |
123 | | static int next_file(fz_context *ctx, fz_stream *stm, size_t n) |
124 | 0 | { |
125 | 0 | fz_file_stream *state = stm->state; |
126 | | |
127 | | /* n is only a hint, that we can safely ignore */ |
128 | 0 | n = fread(state->buffer, 1, sizeof(state->buffer), state->file); |
129 | 0 | if (n < sizeof(state->buffer) && ferror(state->file)) |
130 | 0 | fz_throw(ctx, FZ_ERROR_SYSTEM, "read error: %s", strerror(errno)); |
131 | 0 | stm->rp = state->buffer; |
132 | 0 | stm->wp = state->buffer + n; |
133 | 0 | stm->pos += (int64_t)n; |
134 | |
|
135 | 0 | if (n == 0) |
136 | 0 | return EOF; |
137 | 0 | return *stm->rp++; |
138 | 0 | } |
139 | | |
140 | | static void seek_file(fz_context *ctx, fz_stream *stm, int64_t offset, int whence) |
141 | 0 | { |
142 | 0 | fz_file_stream *state = stm->state; |
143 | | #ifdef _WIN32 |
144 | | int64_t n = _fseeki64(state->file, offset, whence); |
145 | | #else |
146 | 0 | int64_t n = fseeko(state->file, offset, whence); |
147 | 0 | #endif |
148 | 0 | if (n < 0) |
149 | 0 | fz_throw(ctx, FZ_ERROR_SYSTEM, "cannot seek: %s", strerror(errno)); |
150 | | #ifdef _WIN32 |
151 | | stm->pos = _ftelli64(state->file); |
152 | | #else |
153 | 0 | stm->pos = ftello(state->file); |
154 | 0 | #endif |
155 | 0 | stm->rp = state->buffer; |
156 | 0 | stm->wp = state->buffer; |
157 | 0 | } |
158 | | |
159 | | static void drop_file(fz_context *ctx, void *state_) |
160 | 0 | { |
161 | 0 | fz_file_stream *state = state_; |
162 | 0 | if (state->filename && state->del_on_drop) |
163 | 0 | { |
164 | | #ifdef _WIN32 |
165 | | if (state->filename_w) |
166 | | _wunlink(state->filename_w); |
167 | | else |
168 | | #endif |
169 | 0 | unlink(state->filename); |
170 | 0 | } |
171 | | #ifdef _WIN32 |
172 | | fz_free(ctx, state->filename_w); |
173 | | #endif |
174 | 0 | fz_free(ctx, state->filename); |
175 | 0 | fz_free(ctx, state); |
176 | 0 | } |
177 | | |
178 | | static void close_and_drop_file(fz_context *ctx, void *state_) |
179 | 0 | { |
180 | 0 | fz_file_stream *state = state_; |
181 | 0 | if (state) |
182 | 0 | { |
183 | 0 | int n = fclose(state->file); |
184 | 0 | if (n < 0) |
185 | 0 | fz_warn(ctx, "close error: %s", strerror(errno)); |
186 | 0 | drop_file(ctx, state_); |
187 | 0 | } |
188 | 0 | } |
189 | | |
190 | | static fz_stream * |
191 | | fz_open_file_ptr(fz_context *ctx, FILE *file, const char *name, int wide, int del_on_drop) |
192 | 0 | { |
193 | 0 | fz_stream *stm; |
194 | 0 | fz_file_stream *state = NULL; |
195 | |
|
196 | 0 | fz_var(state); |
197 | |
|
198 | 0 | #ifndef _WIN32 |
199 | 0 | assert(!wide); |
200 | 0 | #endif |
201 | 0 | fz_try(ctx) |
202 | 0 | { |
203 | 0 | state = fz_malloc_struct(ctx, fz_file_stream); |
204 | 0 | state->file = file; |
205 | | #ifdef _WIN32 |
206 | | if (wide) |
207 | | { |
208 | | size_t z = wcslen((const wchar_t *)name)+1; |
209 | | state->filename_w = fz_malloc(ctx, z*2); |
210 | | memcpy(state->filename_w, name, z*2); |
211 | | state->filename = fz_utf8_from_wchar(ctx, (const wchar_t *)name); |
212 | | } |
213 | | else |
214 | | #endif |
215 | 0 | state->filename = fz_strdup(ctx, name); |
216 | 0 | state->del_on_drop = del_on_drop; |
217 | |
|
218 | 0 | stm = fz_new_stream(ctx, state, next_file, close_and_drop_file); |
219 | 0 | stm->seek = seek_file; |
220 | 0 | } |
221 | 0 | fz_catch(ctx) |
222 | 0 | { |
223 | 0 | if (state == NULL && del_on_drop) |
224 | 0 | { |
225 | 0 | fclose(file); |
226 | | #ifdef _WIN32 |
227 | | if (wide) |
228 | | _wunlink((const wchar_t *)name); |
229 | | else |
230 | | #endif |
231 | 0 | unlink(name); |
232 | 0 | } |
233 | 0 | else |
234 | 0 | close_and_drop_file(ctx, state); |
235 | 0 | fz_rethrow(ctx); |
236 | 0 | } |
237 | | |
238 | 0 | return stm; |
239 | 0 | } |
240 | | |
241 | | fz_stream *fz_open_file_ptr_no_close(fz_context *ctx, FILE *file) |
242 | 0 | { |
243 | 0 | fz_stream *stm; |
244 | 0 | fz_file_stream *state = fz_malloc_struct(ctx, fz_file_stream); |
245 | 0 | state->file = file; |
246 | | |
247 | | /* We don't own the file ptr. Ensure we don't close it */ |
248 | 0 | stm = fz_new_stream(ctx, state, next_file, drop_file); |
249 | 0 | stm->seek = seek_file; |
250 | |
|
251 | 0 | return stm; |
252 | 0 | } |
253 | | |
254 | | fz_stream * |
255 | | fz_open_file(fz_context *ctx, const char *name) |
256 | 0 | { |
257 | 0 | FILE *file; |
258 | | #ifdef _WIN32 |
259 | | file = fz_fopen_utf8(name, "rb"); |
260 | | #else |
261 | 0 | file = fopen(name, "rb"); |
262 | 0 | #endif |
263 | 0 | if (file == NULL) |
264 | 0 | fz_throw(ctx, FZ_ERROR_SYSTEM, "cannot open %s: %s", name, strerror(errno)); |
265 | 0 | return fz_open_file_ptr(ctx, file, name, 0, 0); |
266 | 0 | } |
267 | | |
268 | | fz_stream * |
269 | | fz_open_file_autodelete(fz_context *ctx, const char *name) |
270 | 0 | { |
271 | 0 | FILE *file; |
272 | | #ifdef _WIN32 |
273 | | file = fz_fopen_utf8(name, "rb"); |
274 | | #else |
275 | 0 | file = fopen(name, "rb"); |
276 | 0 | #endif |
277 | 0 | if (file == NULL) |
278 | 0 | fz_throw(ctx, FZ_ERROR_SYSTEM, "cannot open %s: %s", name, strerror(errno)); |
279 | 0 | return fz_open_file_ptr(ctx, file, name, 0, 1); |
280 | 0 | } |
281 | | |
282 | | fz_stream * |
283 | | fz_try_open_file(fz_context *ctx, const char *name) |
284 | 0 | { |
285 | 0 | FILE *file; |
286 | | #ifdef _WIN32 |
287 | | file = fz_fopen_utf8(name, "rb"); |
288 | | #else |
289 | 0 | file = fopen(name, "rb"); |
290 | 0 | #endif |
291 | 0 | if (file == NULL) |
292 | 0 | return NULL; |
293 | 0 | return fz_open_file_ptr(ctx, file, name, 0, 0); |
294 | 0 | } |
295 | | |
296 | | #ifdef _WIN32 |
297 | | fz_stream * |
298 | | fz_open_file_w(fz_context *ctx, const wchar_t *name) |
299 | | { |
300 | | FILE *file = _wfopen(name, L"rb"); |
301 | | if (file == NULL) |
302 | | fz_throw(ctx, FZ_ERROR_SYSTEM, "cannot open file %ls: %s", name, strerror(errno)); |
303 | | |
304 | | return fz_open_file_ptr(ctx, file, (const char *)name, 1, 0); |
305 | | } |
306 | | #endif |
307 | | |
308 | | const char * |
309 | | fz_stream_filename(fz_context *ctx, fz_stream *stm) |
310 | 0 | { |
311 | 0 | if (!stm || stm->next != next_file) |
312 | 0 | return NULL; |
313 | | |
314 | 0 | return ((fz_file_stream *)stm->state)->filename; |
315 | 0 | } |
316 | | |
317 | | /* Memory stream */ |
318 | | |
319 | | static int next_buffer(fz_context *ctx, fz_stream *stm, size_t max) |
320 | 83.3k | { |
321 | 83.3k | return EOF; |
322 | 83.3k | } |
323 | | |
324 | | static void seek_buffer(fz_context *ctx, fz_stream *stm, int64_t offset, int whence) |
325 | 1.13M | { |
326 | 1.13M | int64_t pos = stm->pos - (stm->wp - stm->rp); |
327 | | /* Convert to absolute pos */ |
328 | 1.13M | if (whence == 1) |
329 | 0 | { |
330 | 0 | offset += pos; /* Was relative to current pos */ |
331 | 0 | } |
332 | 1.13M | else if (whence == 2) |
333 | 8.43k | { |
334 | 8.43k | offset += stm->pos; /* Was relative to end */ |
335 | 8.43k | } |
336 | | |
337 | 1.13M | if (offset < 0) |
338 | 5 | offset = 0; |
339 | 1.13M | if (offset > stm->pos) |
340 | 14.0k | offset = stm->pos; |
341 | 1.13M | stm->rp += (int)(offset - pos); |
342 | 1.13M | } |
343 | | |
344 | | static void drop_buffer(fz_context *ctx, void *state_) |
345 | 59.3k | { |
346 | 59.3k | fz_buffer *state = (fz_buffer *)state_; |
347 | 59.3k | fz_drop_buffer(ctx, state); |
348 | 59.3k | } |
349 | | |
350 | | fz_stream * |
351 | | fz_open_buffer(fz_context *ctx, fz_buffer *buf) |
352 | 59.3k | { |
353 | 59.3k | fz_stream *stm; |
354 | | |
355 | 59.3k | if (buf == NULL) |
356 | 0 | return NULL; |
357 | | |
358 | 59.3k | fz_keep_buffer(ctx, buf); |
359 | 59.3k | stm = fz_new_stream(ctx, buf, next_buffer, drop_buffer); |
360 | 59.3k | stm->seek = seek_buffer; |
361 | | |
362 | 59.3k | stm->rp = buf->data; |
363 | 59.3k | stm->wp = buf->data + buf->len; |
364 | | |
365 | 59.3k | stm->pos = (int64_t)buf->len; |
366 | | |
367 | 59.3k | return stm; |
368 | 59.3k | } |
369 | | |
370 | | fz_stream * |
371 | | fz_open_memory(fz_context *ctx, const unsigned char *data, size_t len) |
372 | 15.6k | { |
373 | 15.6k | fz_stream *stm; |
374 | | |
375 | 15.6k | stm = fz_new_stream(ctx, NULL, next_buffer, NULL); |
376 | 15.6k | stm->seek = seek_buffer; |
377 | | |
378 | 15.6k | stm->rp = (unsigned char *)data; |
379 | 15.6k | stm->wp = (unsigned char *)data + len; |
380 | | |
381 | 15.6k | stm->pos = (int64_t)len; |
382 | | |
383 | 15.6k | return stm; |
384 | 15.6k | } |