Add file access modes to sk_exists.

src/ports/SkOSFile_stdio.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkOSFile.h"
 
 #include <errno.h>
@@ skipping 105 matching lines @@
         return 0;
     }
     return curr;
 }
 
 void sk_fclose(SkFILE* f) {
     SkASSERT(f);
     ::fclose((FILE*)f);
 }
 
-bool sk_exists(const char *path) {
+bool sk_exists(const char *path, SkFILE_Flags flags) {
+    int mode = 0;

[mtklein, 2014/07/10 21:03:30]

  // F_OK
?

[bungeman-skia, 2014/07/10 21:50:07]

Done.

+    if (flags & kRead_SkFILE_Flag) {
+        mode |= 4; //R_OK
+    }
+    if (flags & kWrite_SkFILE_Flag) {
+        mode |= 2; //W_OK
+    }
 #ifdef _WIN32
-    return (0 == _access(path, 0));
+    return (0 == _access(path, mode));
 #else
-    return (0 == access(path, 0));
+    return (0 == access(path, mode));
 #endif
 }
 
 bool sk_isdir(const char *path) {
     struct stat status;
     if (0 != stat(path, &status)) {
         return false;
     }
     return SkToBool(status.st_mode & S_IFDIR);
 }
@@ skipping 15 matching lines @@
 #else
     retval = mkdir(path, 0777);
 #endif
     if (0 == retval) {
         return true;
     } else {
         fprintf(stderr, "sk_mkdir: error %d creating dir '%s'\n", errno, path);
         return false;
     }
 }