src/expat/xmlwf/win32filemap.c

   1 /* Copyright (c) 1998, 1999 Thai Open Source Software Center Ltd
   2    See the file COPYING for copying permission.
   3 */
   4
   5 #define STRICT 1
   6 #define WIN32_LEAN_AND_MEAN 1
   7
   8 #ifdef XML_UNICODE_WCHAR_T
   9 #ifndef XML_UNICODE
  10 #define XML_UNICODE
  11 #endif
  12 #endif
  13
  14 #ifdef XML_UNICODE
  15 #define UNICODE
  16 #define _UNICODE
  17 #endif /* XML_UNICODE */
  18 #include <windows.h>
  19 #include <stdio.h>
  20 #include <tchar.h>
  21 #include "filemap.h"
  22
  23 static void win32perror(const TCHAR *);
  24
  25 int
  26 filemap(const TCHAR *name,
  27         void (*processor)(const void *, size_t, const TCHAR *, void *arg),
  28         void *arg)
  29 {
  30   HANDLE f;
  31   HANDLE m;
  32   DWORD size;
  33   DWORD sizeHi;
  34   void *p;
  35
  36   f = CreateFile(name, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,
  37                           FILE_FLAG_SEQUENTIAL_SCAN, NULL);
  38   if (f == INVALID_HANDLE_VALUE) {
  39     win32perror(name);
  40     return 0;
  41   }
  42   size = GetFileSize(f, &sizeHi);
  43   if (size == (DWORD)-1) {
  44     win32perror(name);
  45     return 0;
  46   }
  47   if (sizeHi) {
  48     _ftprintf(stderr, _T("%s: bigger than 2Gb\n"), name);
  49     return 0;
  50   }
  51   /* CreateFileMapping barfs on zero length files */
  52   if (size == 0) {
  53     static const char c = '\0';
  54     processor(&c, 0, name, arg);
  55     CloseHandle(f);
  56     return 1;
  57   }
  58   m = CreateFileMapping(f, NULL, PAGE_READONLY, 0, 0, NULL);
  59   if (m == NULL) {
  60     win32perror(name);
  61     CloseHandle(f);
  62     return 0;
  63   }
  64   p = MapViewOfFile(m, FILE_MAP_READ, 0, 0, 0);
  65   if (p == NULL) {
  66     win32perror(name);
  67     CloseHandle(m);
  68     CloseHandle(f);
  69     return 0;
  70   }
  71   processor(p, size, name, arg);
  72   UnmapViewOfFile(p);
  73   CloseHandle(m);
  74   CloseHandle(f);
  75   return 1;
  76 }
  77
  78 static void
  79 win32perror(const TCHAR *s)
  80 {
  81   LPVOID buf;
  82   if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER
  83                     | FORMAT_MESSAGE_FROM_SYSTEM,
  84                     NULL,
  85                     GetLastError(),
  86                     MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
  87                     (LPTSTR) &buf,
  88                     0,
  89                     NULL)) {
  90     _ftprintf(stderr, _T("%s: %s"), s, buf);
  91     fflush(stderr);
  92     LocalFree(buf);
  93   }
  94   else
  95     _ftprintf(stderr, _T("%s: unknown Windows error\n"), s);
  96 }