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1 /* 7zFile.c -- File IO
2 2021-04-29 : Igor Pavlov : Public domain */
3
4 #include "Precomp.h"
5
6 #include "7zFile.h"
7
8 #ifndef USE_WINDOWS_FILE
9
10 #include <errno.h>
11
12 #ifndef USE_FOPEN
13 #include <stdio.h>
14 #include <fcntl.h>
15 #ifdef _WIN32
16 #include <io.h>
17 typedef int ssize_t;
18 typedef int off_t;
19 #else
20 #include <unistd.h>
21 #endif
22 #endif
23
24 #else
25
26 /*
27 ReadFile and WriteFile functions in Windows have BUG:
28 If you Read or Write 64MB or more (probably min_failure_size = 64MB - 32KB + 1)
29 from/to Network file, it returns ERROR_NO_SYSTEM_RESOURCES
30 (Insufficient system resources exist to complete the requested service).
31 Probably in some version of Windows there are problems with other sizes:
32 for 32 MB (maybe also for 16 MB).
33 And message can be "Network connection was lost"
34 */
35
36 #endif
37
38 #define kChunkSizeMax (1 << 22)
39
40 void File_Construct(CSzFile *p)
41 {
42 #ifdef USE_WINDOWS_FILE
43 p->handle = INVALID_HANDLE_VALUE;
44 #elif defined(USE_FOPEN)
45 p->file = NULL;
46 #else
47 p->fd = -1;
48 #endif
49 }
50
51 #if !defined(UNDER_CE) || !defined(USE_WINDOWS_FILE)
52
53 static WRes File_Open(CSzFile *p, const char *name, int writeMode)
54 {
55 #ifdef USE_WINDOWS_FILE
56
57 p->handle = CreateFileA(name,
58 writeMode ? GENERIC_WRITE : GENERIC_READ,
59 FILE_SHARE_READ, NULL,
60 writeMode ? CREATE_ALWAYS : OPEN_EXISTING,
61 FILE_ATTRIBUTE_NORMAL, NULL);
62 return (p->handle != INVALID_HANDLE_VALUE) ? 0 : GetLastError();
63
64 #elif defined(USE_FOPEN)
65
66 p->file = fopen(name, writeMode ? "wb+" : "rb");
67 return (p->file != 0) ? 0 :
68 #ifdef UNDER_CE
69 2; /* ENOENT */
70 #else
71 errno;
72 #endif
73
74 #else
75
76 int flags = (writeMode ? (O_CREAT | O_EXCL | O_WRONLY) : O_RDONLY);
77 #ifdef O_BINARY
78 flags |= O_BINARY;
79 #endif
80 p->fd = open(name, flags, 0666);
81 return (p->fd != -1) ? 0 : errno;
82
83 #endif
84 }
85
86 WRes InFile_Open(CSzFile *p, const char *name) { return File_Open(p, name, 0); }
87
88 WRes OutFile_Open(CSzFile *p, const char *name)
89 {
90 #if defined(USE_WINDOWS_FILE) || defined(USE_FOPEN)
91 return File_Open(p, name, 1);
92 #else
93 p->fd = creat(name, 0666);
94 return (p->fd != -1) ? 0 : errno;
95 #endif
96 }
97
98 #endif
99
100
101 #ifdef USE_WINDOWS_FILE
102 static WRes File_OpenW(CSzFile *p, const WCHAR *name, int writeMode)
103 {
104 p->handle = CreateFileW(name,
105 writeMode ? GENERIC_WRITE : GENERIC_READ,
106 FILE_SHARE_READ, NULL,
107 writeMode ? CREATE_ALWAYS : OPEN_EXISTING,
108 FILE_ATTRIBUTE_NORMAL, NULL);
109 return (p->handle != INVALID_HANDLE_VALUE) ? 0 : GetLastError();
110 }
111 WRes InFile_OpenW(CSzFile *p, const WCHAR *name) { return File_OpenW(p, name, 0); }
112 WRes OutFile_OpenW(CSzFile *p, const WCHAR *name) { return File_OpenW(p, name, 1); }
113 #endif
114
115 WRes File_Close(CSzFile *p)
116 {
117 #ifdef USE_WINDOWS_FILE
118
119 if (p->handle != INVALID_HANDLE_VALUE)
120 {
121 if (!CloseHandle(p->handle))
122 return GetLastError();
123 p->handle = INVALID_HANDLE_VALUE;
124 }
125
126 #elif defined(USE_FOPEN)
127
128 if (p->file != NULL)
129 {
130 int res = fclose(p->file);
131 if (res != 0)
132 {
133 if (res == EOF)
134 return errno;
135 return res;
136 }
137 p->file = NULL;
138 }
139
140 #else
141
142 if (p->fd != -1)
143 {
144 if (close(p->fd) != 0)
145 return errno;
146 p->fd = -1;
147 }
148
149 #endif
150
151 return 0;
152 }
153
154
155 WRes File_Read(CSzFile *p, void *data, size_t *size)
156 {
157 size_t originalSize = *size;
158 *size = 0;
159 if (originalSize == 0)
160 return 0;
161
162 #ifdef USE_WINDOWS_FILE
163
164 do
165 {
166 const DWORD curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : (DWORD)originalSize;
167 DWORD processed = 0;
168 const BOOL res = ReadFile(p->handle, data, curSize, &processed, NULL);
169 data = (void *)((Byte *)data + processed);
170 originalSize -= processed;
171 *size += processed;
172 if (!res)
173 return GetLastError();
174 // debug : we can break here for partial reading mode
175 if (processed == 0)
176 break;
177 }
178 while (originalSize > 0);
179
180 #elif defined(USE_FOPEN)
181
182 do
183 {
184 const size_t curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : originalSize;
185 const size_t processed = fread(data, 1, curSize, p->file);
186 data = (void *)((Byte *)data + (size_t)processed);
187 originalSize -= processed;
188 *size += processed;
189 if (processed != curSize)
190 return ferror(p->file);
191 // debug : we can break here for partial reading mode
192 if (processed == 0)
193 break;
194 }
195 while (originalSize > 0);
196
197 #else
198
199 do
200 {
201 const size_t curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : originalSize;
202 const ssize_t processed = read(p->fd, data, curSize);
203 if (processed == -1)
204 return errno;
205 if (processed == 0)
206 break;
207 data = (void *)((Byte *)data + (size_t)processed);
208 originalSize -= (size_t)processed;
209 *size += (size_t)processed;
210 // debug : we can break here for partial reading mode
211 // break;
212 }
213 while (originalSize > 0);
214
215 #endif
216
217 return 0;
218 }
219
220
221 WRes File_Write(CSzFile *p, const void *data, size_t *size)
222 {
223 size_t originalSize = *size;
224 *size = 0;
225 if (originalSize == 0)
226 return 0;
227
228 #ifdef USE_WINDOWS_FILE
229
230 do
231 {
232 const DWORD curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : (DWORD)originalSize;
233 DWORD processed = 0;
234 const BOOL res = WriteFile(p->handle, data, curSize, &processed, NULL);
235 data = (const void *)((const Byte *)data + processed);
236 originalSize -= processed;
237 *size += processed;
238 if (!res)
239 return GetLastError();
240 if (processed == 0)
241 break;
242 }
243 while (originalSize > 0);
244
245 #elif defined(USE_FOPEN)
246
247 do
248 {
249 const size_t curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : originalSize;
250 const size_t processed = fwrite(data, 1, curSize, p->file);
251 data = (void *)((Byte *)data + (size_t)processed);
252 originalSize -= processed;
253 *size += processed;
254 if (processed != curSize)
255 return ferror(p->file);
256 if (processed == 0)
257 break;
258 }
259 while (originalSize > 0);
260
261 #else
262
263 do
264 {
265 const size_t curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : originalSize;
266 const ssize_t processed = write(p->fd, data, curSize);
267 if (processed == -1)
268 return errno;
269 if (processed == 0)
270 break;
271 data = (void *)((Byte *)data + (size_t)processed);
272 originalSize -= (size_t)processed;
273 *size += (size_t)processed;
274 }
275 while (originalSize > 0);
276
277 #endif
278
279 return 0;
280 }
281
282
283 WRes File_Seek(CSzFile *p, Int64 *pos, ESzSeek origin)
284 {
285 #ifdef USE_WINDOWS_FILE
286
287 DWORD moveMethod;
288 UInt32 low = (UInt32)*pos;
289 LONG high = (LONG)((UInt64)*pos >> 16 >> 16); /* for case when UInt64 is 32-bit only */
290 switch (origin)
291 {
292 case SZ_SEEK_SET: moveMethod = FILE_BEGIN; break;
293 case SZ_SEEK_CUR: moveMethod = FILE_CURRENT; break;
294 case SZ_SEEK_END: moveMethod = FILE_END; break;
295 default: return ERROR_INVALID_PARAMETER;
296 }
297 low = SetFilePointer(p->handle, (LONG)low, &high, moveMethod);
298 if (low == (UInt32)0xFFFFFFFF)
299 {
300 WRes res = GetLastError();
301 if (res != NO_ERROR)
302 return res;
303 }
304 *pos = ((Int64)high << 32) | low;
305 return 0;
306
307 #else
308
309 int moveMethod; // = origin;
310
311 switch (origin)
312 {
313 case SZ_SEEK_SET: moveMethod = SEEK_SET; break;
314 case SZ_SEEK_CUR: moveMethod = SEEK_CUR; break;
315 case SZ_SEEK_END: moveMethod = SEEK_END; break;
316 default: return EINVAL;
317 }
318
319 #if defined(USE_FOPEN)
320 {
321 int res = fseek(p->file, (long)*pos, moveMethod);
322 if (res == -1)
323 return errno;
324 *pos = ftell(p->file);
325 if (*pos == -1)
326 return errno;
327 return 0;
328 }
329 #else
330 {
331 off_t res = lseek(p->fd, (off_t)*pos, moveMethod);
332 if (res == -1)
333 return errno;
334 *pos = res;
335 return 0;
336 }
337
338 #endif // USE_FOPEN
339 #endif // USE_WINDOWS_FILE
340 }
341
342
343 WRes File_GetLength(CSzFile *p, UInt64 *length)
344 {
345 #ifdef USE_WINDOWS_FILE
346
347 DWORD sizeHigh;
348 DWORD sizeLow = GetFileSize(p->handle, &sizeHigh);
349 if (sizeLow == 0xFFFFFFFF)
350 {
351 DWORD res = GetLastError();
352 if (res != NO_ERROR)
353 return res;
354 }
355 *length = (((UInt64)sizeHigh) << 32) + sizeLow;
356 return 0;
357
358 #elif defined(USE_FOPEN)
359
360 long pos = ftell(p->file);
361 int res = fseek(p->file, 0, SEEK_END);
362 *length = ftell(p->file);
363 fseek(p->file, pos, SEEK_SET);
364 return res;
365
366 #else
367
368 off_t pos;
369 *length = 0;
370 pos = lseek(p->fd, 0, SEEK_CUR);
371 if (pos != -1)
372 {
373 const off_t len2 = lseek(p->fd, 0, SEEK_END);
374 const off_t res2 = lseek(p->fd, pos, SEEK_SET);
375 if (len2 != -1)
376 {
377 *length = (UInt64)len2;
378 if (res2 != -1)
379 return 0;
380 }
381 }
382 return errno;
383
384 #endif
385 }
386
387
388 /* ---------- FileSeqInStream ---------- */
389
390 static SRes FileSeqInStream_Read(const ISeqInStream *pp, void *buf, size_t *size)
391 {
392 CFileSeqInStream *p = CONTAINER_FROM_VTBL(pp, CFileSeqInStream, vt);
393 WRes wres = File_Read(&p->file, buf, size);
394 p->wres = wres;
395 return (wres == 0) ? SZ_OK : SZ_ERROR_READ;
396 }
397
398 void FileSeqInStream_CreateVTable(CFileSeqInStream *p)
399 {
400 p->vt.Read = FileSeqInStream_Read;
401 }
402
403
404 /* ---------- FileInStream ---------- */
405
406 static SRes FileInStream_Read(const ISeekInStream *pp, void *buf, size_t *size)
407 {
408 CFileInStream *p = CONTAINER_FROM_VTBL(pp, CFileInStream, vt);
409 WRes wres = File_Read(&p->file, buf, size);
410 p->wres = wres;
411 return (wres == 0) ? SZ_OK : SZ_ERROR_READ;
412 }
413
414 static SRes FileInStream_Seek(const ISeekInStream *pp, Int64 *pos, ESzSeek origin)
415 {
416 CFileInStream *p = CONTAINER_FROM_VTBL(pp, CFileInStream, vt);
417 WRes wres = File_Seek(&p->file, pos, origin);
418 p->wres = wres;
419 return (wres == 0) ? SZ_OK : SZ_ERROR_READ;
420 }
421
422 void FileInStream_CreateVTable(CFileInStream *p)
423 {
424 p->vt.Read = FileInStream_Read;
425 p->vt.Seek = FileInStream_Seek;
426 }
427
428
429 /* ---------- FileOutStream ---------- */
430
431 static size_t FileOutStream_Write(const ISeqOutStream *pp, const void *data, size_t size)
432 {
433 CFileOutStream *p = CONTAINER_FROM_VTBL(pp, CFileOutStream, vt);
434 WRes wres = File_Write(&p->file, data, &size);
435 p->wres = wres;
436 return size;
437 }
438
439 void FileOutStream_CreateVTable(CFileOutStream *p)
440 {
441 p->vt.Write = FileOutStream_Write;
442 }