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(const void *path)
  33 {
  34         return CreateFileW((const wchar_t*)path,
  35                            GENERIC_READ | READ_CONTROL,
  36                            FILE_SHARE_READ,
  37                            NULL, /* lpSecurityAttributes */
  38                            OPEN_EXISTING,
  39                            FILE_FLAG_BACKUP_SEMANTICS |
  40                                    FILE_FLAG_OPEN_REPARSE_POINT,
  41                            NULL /* hTemplateFile */);
  42 }
  43
  44 int win32_read_file(const char *filename,
  45                     void *handle, u64 offset, size_t size, u8 *buf)
  46 {
  47         HANDLE h = handle;
  48         DWORD err;
  49         DWORD bytesRead;
  50         LARGE_INTEGER liOffset = {.QuadPart = offset};
  51
  52         wimlib_assert(size <= 0xffffffff);
  53
  54         if (SetFilePointerEx(h, liOffset, NULL, FILE_BEGIN))
  55                 if (ReadFile(h, buf, size, &bytesRead, NULL) && bytesRead == size)
  56                         return 0;
  57         err = GetLastError();
  58         ERROR("Error reading \"%s\"", filename);
  59         win32_error(err);
  60         return WIMLIB_ERR_READ;
  61 }
  62
  63 void win32_close_file(void *handle)
  64 {
  65         CloseHandle((HANDLE)handle);
  66 }
  67
  68 #endif /* __CYGWIN__ || __WIN32__ */