1/* 7zFile.c -- File IO
22009-11-24 : Igor Pavlov : Public domain */
3
4#include "7zFile.h"
5
6#ifndef USE_WINDOWS_FILE
7
8#ifndef UNDER_CE
9#include <errno.h>
10#endif
11
12#else
13
14/*
15 ReadFile and WriteFile functions in Windows have BUG:
16 If you Read or Write 64MB or more (probably min_failure_size = 64MB - 32KB + 1)
17 from/to Network file, it returns ERROR_NO_SYSTEM_RESOURCES
18 (Insufficient system resources exist to complete the requested service).
19 Probably in some version of Windows there are problems with other sizes:
20 for 32 MB (maybe also for 16 MB).
21 And message can be "Network connection was lost"
22*/
23
24#define kChunkSizeMax (1 << 22)
25
26#endif
27
28void File_Construct(CSzFile *p)
29{
30 #ifdef USE_WINDOWS_FILE
31 p->handle = INVALID_HANDLE_VALUE;
32 #else
33 p->file = NULL;
34 #endif
35}
36
37#if !defined(UNDER_CE) || !defined(USE_WINDOWS_FILE)
38static WRes File_Open(CSzFile *p, const char *name, int writeMode)
39{
40 #ifdef USE_WINDOWS_FILE
41 p->handle = CreateFileA(name,
42 writeMode ? GENERIC_WRITE : GENERIC_READ,
43 FILE_SHARE_READ, NULL,
44 writeMode ? CREATE_ALWAYS : OPEN_EXISTING,
45 FILE_ATTRIBUTE_NORMAL, NULL);
46 return (p->handle != INVALID_HANDLE_VALUE) ? 0 : GetLastError();
47 #else
48 p->file = fopen(name, writeMode ? "wb+" : "rb");
49 return (p->file != 0) ? 0 :
50 #ifdef UNDER_CE
51 2; /* ENOENT */
52 #else
53 errno;
54 #endif
55 #endif
56}
57
58WRes InFile_Open(CSzFile *p, const char *name) { return File_Open(p, name, 0); }
59WRes OutFile_Open(CSzFile *p, const char *name) { return File_Open(p, name, 1); }
60#endif
61
62#ifdef USE_WINDOWS_FILE
63static WRes File_OpenW(CSzFile *p, const WCHAR *name, int writeMode)
64{
65 p->handle = CreateFileW(name,
66 writeMode ? GENERIC_WRITE : GENERIC_READ,
67 FILE_SHARE_READ, NULL,
68 writeMode ? CREATE_ALWAYS : OPEN_EXISTING,
69 FILE_ATTRIBUTE_NORMAL, NULL);
70 return (p->handle != INVALID_HANDLE_VALUE) ? 0 : GetLastError();
71}
72WRes InFile_OpenW(CSzFile *p, const WCHAR *name) { return File_OpenW(p, name, 0); }
73WRes OutFile_OpenW(CSzFile *p, const WCHAR *name) { return File_OpenW(p, name, 1); }
74#endif
75
76WRes File_Close(CSzFile *p)
77{
78 #ifdef USE_WINDOWS_FILE
79 if (p->handle != INVALID_HANDLE_VALUE)
80 {
81 if (!CloseHandle(p->handle))
82 return GetLastError();
83 p->handle = INVALID_HANDLE_VALUE;
84 }
85 #else
86 if (p->file != NULL)
87 {
88 int res = fclose(p->file);
89 if (res != 0)
90 return res;
91 p->file = NULL;
92 }
93 #endif
94 return 0;
95}
96
97WRes File_Read(CSzFile *p, void *data, size_t *size)
98{
99 size_t originalSize = *size;
100 if (originalSize == 0)
101 return 0;
102
103 #ifdef USE_WINDOWS_FILE
104
105 *size = 0;
106 do
107 {
108 DWORD curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : (DWORD)originalSize;
109 DWORD processed = 0;
110 BOOL res = ReadFile(p->handle, data, curSize, &processed, NULL);
111 data = (void *)((Byte *)data + processed);
112 originalSize -= processed;
113 *size += processed;
114 if (!res)
115 return GetLastError();
116 if (processed == 0)
117 break;
118 }
119 while (originalSize > 0);
120 return 0;
121
122 #else
123
124 *size = fread(data, 1, originalSize, p->file);
125 if (*size == originalSize)
126 return 0;
127 return ferror(p->file);
128
129 #endif
130}
131
132WRes File_Write(CSzFile *p, const void *data, size_t *size)
133{
134 size_t originalSize = *size;
135 if (originalSize == 0)
136 return 0;
137
138 #ifdef USE_WINDOWS_FILE
139
140 *size = 0;
141 do
142 {
143 DWORD curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : (DWORD)originalSize;
144 DWORD processed = 0;
145 BOOL res = WriteFile(p->handle, data, curSize, &processed, NULL);
146 data = (void *)((Byte *)data + processed);
147 originalSize -= processed;
148 *size += processed;
149 if (!res)
150 return GetLastError();
151 if (processed == 0)
152 break;
153 }
154 while (originalSize > 0);
155 return 0;
156
157 #else
158
159 *size = fwrite(data, 1, originalSize, p->file);
160 if (*size == originalSize)
161 return 0;
162 return ferror(p->file);
163
164 #endif
165}
166
167WRes File_Seek(CSzFile *p, Int64 *pos, ESzSeek origin)
168{
169 #ifdef USE_WINDOWS_FILE
170
171 LARGE_INTEGER value;
172 DWORD moveMethod;
173 value.LowPart = (DWORD)*pos;
174 value.HighPart = (LONG)((UInt64)*pos >> 16 >> 16); /* for case when UInt64 is 32-bit only */
175 switch (origin)
176 {
177 case SZ_SEEK_SET: moveMethod = FILE_BEGIN; break;
178 case SZ_SEEK_CUR: moveMethod = FILE_CURRENT; break;
179 case SZ_SEEK_END: moveMethod = FILE_END; break;
180 default: return ERROR_INVALID_PARAMETER;
181 }
182 value.LowPart = SetFilePointer(p->handle, value.LowPart, &value.HighPart, moveMethod);
183 if (value.LowPart == 0xFFFFFFFF)
184 {
185 WRes res = GetLastError();
186 if (res != NO_ERROR)
187 return res;
188 }
189 *pos = ((Int64)value.HighPart << 32) | value.LowPart;
190 return 0;
191
192 #else
193
194 int moveMethod;
195 int res;
196 switch (origin)
197 {
198 case SZ_SEEK_SET: moveMethod = SEEK_SET; break;
199 case SZ_SEEK_CUR: moveMethod = SEEK_CUR; break;
200 case SZ_SEEK_END: moveMethod = SEEK_END; break;
201 default: return 1;
202 }
203 res = fseek(p->file, (long)*pos, moveMethod);
204 *pos = ftell(p->file);
205 return res;
206
207 #endif
208}
209
210WRes File_GetLength(CSzFile *p, UInt64 *length)
211{
212 #ifdef USE_WINDOWS_FILE
213
214 DWORD sizeHigh;
215 DWORD sizeLow = GetFileSize(p->handle, &sizeHigh);
216 if (sizeLow == 0xFFFFFFFF)
217 {
218 DWORD res = GetLastError();
219 if (res != NO_ERROR)
220 return res;
221 }
222 *length = (((UInt64)sizeHigh) << 32) + sizeLow;
223 return 0;
224
225 #else
226
227 long pos = ftell(p->file);
228 int res = fseek(p->file, 0, SEEK_END);
229 *length = ftell(p->file);
230 fseek(p->file, pos, SEEK_SET);
231 return res;
232
233 #endif
234}
235
236
237/* ---------- FileSeqInStream ---------- */
238
239static SRes FileSeqInStream_Read(void *pp, void *buf, size_t *size)
240{
241 CFileSeqInStream *p = (CFileSeqInStream *)pp;
242 return File_Read(&p->file, buf, size) == 0 ? SZ_OK : SZ_ERROR_READ;
243}
244
245void FileSeqInStream_CreateVTable(CFileSeqInStream *p)
246{
247 p->s.Read = FileSeqInStream_Read;
248}
249
250
251/* ---------- FileInStream ---------- */
252
253static SRes FileInStream_Read(void *pp, void *buf, size_t *size)
254{
255 CFileInStream *p = (CFileInStream *)pp;
256 return (File_Read(&p->file, buf, size) == 0) ? SZ_OK : SZ_ERROR_READ;
257}
258
259static SRes FileInStream_Seek(void *pp, Int64 *pos, ESzSeek origin)
260{
261 CFileInStream *p = (CFileInStream *)pp;
262 return File_Seek(&p->file, pos, origin);
263}
264
265void FileInStream_CreateVTable(CFileInStream *p)
266{
267 p->s.Read = FileInStream_Read;
268 p->s.Seek = FileInStream_Seek;
269}
270
271
272/* ---------- FileOutStream ---------- */
273
274static size_t FileOutStream_Write(void *pp, const void *data, size_t size)
275{
276 CFileOutStream *p = (CFileOutStream *)pp;
277 File_Write(&p->file, data, &size);
278 return size;
279}
280
281void FileOutStream_CreateVTable(CFileOutStream *p)
282{
283 p->s.Write = FileOutStream_Write;
284}
285