1/* 7zFile.c -- File IO
22009-11-24 : Igor Pavlov : Public domain */
3
4#include "Precomp.h"
5
6#include "7zFile.h"
7
8#ifndef USE_WINDOWS_FILE
9
10#ifndef UNDER_CE
11#include <errno.h>
12#endif
13
14#else
15
16/*
17   ReadFile and WriteFile functions in Windows have BUG:
18   If you Read or Write 64MB or more (probably min_failure_size = 64MB - 32KB + 1)
19   from/to Network file, it returns ERROR_NO_SYSTEM_RESOURCES
20   (Insufficient system resources exist to complete the requested service).
21   Probably in some version of Windows there are problems with other sizes:
22   for 32 MB (maybe also for 16 MB).
23   And message can be "Network connection was lost"
24*/
25
26#define kChunkSizeMax (1 << 22)
27
28#endif
29
30void File_Construct(CSzFile *p)
31{
32  #ifdef USE_WINDOWS_FILE
33  p->handle = INVALID_HANDLE_VALUE;
34  #else
35  p->file = NULL;
36  #endif
37}
38
39#if !defined(UNDER_CE) || !defined(USE_WINDOWS_FILE)
40static WRes File_Open(CSzFile *p, const char *name, int writeMode)
41{
42  #ifdef USE_WINDOWS_FILE
43  p->handle = CreateFileA(name,
44      writeMode ? GENERIC_WRITE : GENERIC_READ,
45      FILE_SHARE_READ, NULL,
46      writeMode ? CREATE_ALWAYS : OPEN_EXISTING,
47      FILE_ATTRIBUTE_NORMAL, NULL);
48  return (p->handle != INVALID_HANDLE_VALUE) ? 0 : GetLastError();
49  #else
50  p->file = fopen(name, writeMode ? "wb+" : "rb");
51  return (p->file != 0) ? 0 :
52    #ifdef UNDER_CE
53    2; /* ENOENT */
54    #else
55    errno;
56    #endif
57  #endif
58}
59
60WRes InFile_Open(CSzFile *p, const char *name) { return File_Open(p, name, 0); }
61WRes OutFile_Open(CSzFile *p, const char *name) { return File_Open(p, name, 1); }
62#endif
63
64#ifdef USE_WINDOWS_FILE
65static WRes File_OpenW(CSzFile *p, const WCHAR *name, int writeMode)
66{
67  p->handle = CreateFileW(name,
68      writeMode ? GENERIC_WRITE : GENERIC_READ,
69      FILE_SHARE_READ, NULL,
70      writeMode ? CREATE_ALWAYS : OPEN_EXISTING,
71      FILE_ATTRIBUTE_NORMAL, NULL);
72  return (p->handle != INVALID_HANDLE_VALUE) ? 0 : GetLastError();
73}
74WRes InFile_OpenW(CSzFile *p, const WCHAR *name) { return File_OpenW(p, name, 0); }
75WRes OutFile_OpenW(CSzFile *p, const WCHAR *name) { return File_OpenW(p, name, 1); }
76#endif
77
78WRes File_Close(CSzFile *p)
79{
80  #ifdef USE_WINDOWS_FILE
81  if (p->handle != INVALID_HANDLE_VALUE)
82  {
83    if (!CloseHandle(p->handle))
84      return GetLastError();
85    p->handle = INVALID_HANDLE_VALUE;
86  }
87  #else
88  if (p->file != NULL)
89  {
90    int res = fclose(p->file);
91    if (res != 0)
92      return res;
93    p->file = NULL;
94  }
95  #endif
96  return 0;
97}
98
99WRes File_Read(CSzFile *p, void *data, size_t *size)
100{
101  size_t originalSize = *size;
102  if (originalSize == 0)
103    return 0;
104
105  #ifdef USE_WINDOWS_FILE
106
107  *size = 0;
108  do
109  {
110    DWORD curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : (DWORD)originalSize;
111    DWORD processed = 0;
112    BOOL res = ReadFile(p->handle, data, curSize, &processed, NULL);
113    data = (void *)((Byte *)data + processed);
114    originalSize -= processed;
115    *size += processed;
116    if (!res)
117      return GetLastError();
118    if (processed == 0)
119      break;
120  }
121  while (originalSize > 0);
122  return 0;
123
124  #else
125
126  *size = fread(data, 1, originalSize, p->file);
127  if (*size == originalSize)
128    return 0;
129  return ferror(p->file);
130
131  #endif
132}
133
134WRes File_Write(CSzFile *p, const void *data, size_t *size)
135{
136  size_t originalSize = *size;
137  if (originalSize == 0)
138    return 0;
139
140  #ifdef USE_WINDOWS_FILE
141
142  *size = 0;
143  do
144  {
145    DWORD curSize = (originalSize > kChunkSizeMax) ? kChunkSizeMax : (DWORD)originalSize;
146    DWORD processed = 0;
147    BOOL res = WriteFile(p->handle, data, curSize, &processed, NULL);
148    data = (void *)((Byte *)data + processed);
149    originalSize -= processed;
150    *size += processed;
151    if (!res)
152      return GetLastError();
153    if (processed == 0)
154      break;
155  }
156  while (originalSize > 0);
157  return 0;
158
159  #else
160
161  *size = fwrite(data, 1, originalSize, p->file);
162  if (*size == originalSize)
163    return 0;
164  return ferror(p->file);
165
166  #endif
167}
168
169WRes File_Seek(CSzFile *p, Int64 *pos, ESzSeek origin)
170{
171  #ifdef USE_WINDOWS_FILE
172
173  LARGE_INTEGER value;
174  DWORD moveMethod;
175  value.LowPart = (DWORD)*pos;
176  value.HighPart = (LONG)((UInt64)*pos >> 16 >> 16); /* for case when UInt64 is 32-bit only */
177  switch (origin)
178  {
179    case SZ_SEEK_SET: moveMethod = FILE_BEGIN; break;
180    case SZ_SEEK_CUR: moveMethod = FILE_CURRENT; break;
181    case SZ_SEEK_END: moveMethod = FILE_END; break;
182    default: return ERROR_INVALID_PARAMETER;
183  }
184  value.LowPart = SetFilePointer(p->handle, value.LowPart, &value.HighPart, moveMethod);
185  if (value.LowPart == 0xFFFFFFFF)
186  {
187    WRes res = GetLastError();
188    if (res != NO_ERROR)
189      return res;
190  }
191  *pos = ((Int64)value.HighPart << 32) | value.LowPart;
192  return 0;
193
194  #else
195
196  int moveMethod;
197  int res;
198  switch (origin)
199  {
200    case SZ_SEEK_SET: moveMethod = SEEK_SET; break;
201    case SZ_SEEK_CUR: moveMethod = SEEK_CUR; break;
202    case SZ_SEEK_END: moveMethod = SEEK_END; break;
203    default: return 1;
204  }
205  res = fseek(p->file, (long)*pos, moveMethod);
206  *pos = ftell(p->file);
207  return res;
208
209  #endif
210}
211
212WRes File_GetLength(CSzFile *p, UInt64 *length)
213{
214  #ifdef USE_WINDOWS_FILE
215
216  DWORD sizeHigh;
217  DWORD sizeLow = GetFileSize(p->handle, &sizeHigh);
218  if (sizeLow == 0xFFFFFFFF)
219  {
220    DWORD res = GetLastError();
221    if (res != NO_ERROR)
222      return res;
223  }
224  *length = (((UInt64)sizeHigh) << 32) + sizeLow;
225  return 0;
226
227  #else
228
229  long pos = ftell(p->file);
230  int res = fseek(p->file, 0, SEEK_END);
231  *length = ftell(p->file);
232  fseek(p->file, pos, SEEK_SET);
233  return res;
234
235  #endif
236}
237
238
239/* ---------- FileSeqInStream ---------- */
240
241static SRes FileSeqInStream_Read(void *pp, void *buf, size_t *size)
242{
243  CFileSeqInStream *p = (CFileSeqInStream *)pp;
244  return File_Read(&p->file, buf, size) == 0 ? SZ_OK : SZ_ERROR_READ;
245}
246
247void FileSeqInStream_CreateVTable(CFileSeqInStream *p)
248{
249  p->s.Read = FileSeqInStream_Read;
250}
251
252
253/* ---------- FileInStream ---------- */
254
255static SRes FileInStream_Read(void *pp, void *buf, size_t *size)
256{
257  CFileInStream *p = (CFileInStream *)pp;
258  return (File_Read(&p->file, buf, size) == 0) ? SZ_OK : SZ_ERROR_READ;
259}
260
261static SRes FileInStream_Seek(void *pp, Int64 *pos, ESzSeek origin)
262{
263  CFileInStream *p = (CFileInStream *)pp;
264  return File_Seek(&p->file, pos, origin);
265}
266
267void FileInStream_CreateVTable(CFileInStream *p)
268{
269  p->s.Read = FileInStream_Read;
270  p->s.Seek = FileInStream_Seek;
271}
272
273
274/* ---------- FileOutStream ---------- */
275
276static size_t FileOutStream_Write(void *pp, const void *data, size_t size)
277{
278  CFileOutStream *p = (CFileOutStream *)pp;
279  File_Write(&p->file, data, &size);
280  return size;
281}
282
283void FileOutStream_CreateVTable(CFileOutStream *p)
284{
285  p->s.Write = FileOutStream_Write;
286}
287