wimlib.net Git - wimlib/blob - src/win32.c

   1 #include "config.h"
   2
   3 #if defined(__CYGWIN__) || defined(__WIN32__)
   4 #include <windows.h>
   5 #       ifdef ERROR
   6 #               undef ERROR
   7 #       endif
   8
   9 #include "wimlib_internal.h"
  10
  11
  12 #ifdef ENABLE_ERROR_MESSAGES
  13 void win32_error(u32 err_code)
  14 {
  15         char *buffer;
  16         DWORD nchars;
  17         nchars = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
  18                                 NULL, err_code, 0,
  19                                 (char*)&buffer, 0, NULL);
  20         if (nchars == 0) {
  21                 ERROR("Error printing error message! "
  22                       "Computer will self-destruct in 3 seconds.");
  23         } else {
  24                 ERROR("Win32 error: %s", buffer);
  25                 LocalFree(buffer);
  26         }
  27 }
  28 #else
  29 #define win32_error(err_code)
  30 #endif
  31
  32 void *win32_open_file_readonly(const void *path)
  33 {
  34         return CreateFileW((const wchar_t*)path,
  35                            FILE_READ_DATA |
  36                                FILE_READ_ATTRIBUTES |
  37                                READ_CONTROL |
  38                                ACCESS_SYSTEM_SECURITY,
  39                            FILE_SHARE_READ,
  40                            NULL, /* lpSecurityAttributes */
  41                            OPEN_EXISTING,
  42                            FILE_FLAG_BACKUP_SEMANTICS |
  43                                FILE_FLAG_OPEN_REPARSE_POINT,
  44                            NULL /* hTemplateFile */);
  45 }
  46
  47 int win32_read_file(const char *filename,
  48                     void *handle, u64 offset, size_t size, u8 *buf)
  49 {
  50         HANDLE h = handle;
  51         DWORD err;
  52         DWORD bytesRead;
  53         LARGE_INTEGER liOffset = {.QuadPart = offset};
  54
  55         wimlib_assert(size <= 0xffffffff);
  56
  57         if (SetFilePointerEx(h, liOffset, NULL, FILE_BEGIN))
  58                 if (ReadFile(h, buf, size, &bytesRead, NULL) && bytesRead == size)
  59                         return 0;
  60         err = GetLastError();
  61         ERROR("Error reading \"%s\"", filename);
  62         win32_error(err);
  63         return WIMLIB_ERR_READ;
  64 }
  65
  66 void win32_close_file(void *handle)
  67 {
  68         CloseHandle((HANDLE)handle);
  69 }
  70
  71 #endif /* __CYGWIN__ || __WIN32__ */