Add FileIO::exists() function

renderdoc/os/os_specific.h

@@ -252,6 +252,8 @@ FILE *fopen(const char *filename, const char *mode);
 size_t fread(void *buf, size_t elementSize, size_t count, FILE *f);
 size_t fwrite(const void *buf, size_t elementSize, size_t count, FILE *f);
 
+bool exists(const char *filename);
+
 std::string getline(FILE *f);
 
 uint64_t ftell64(FILE *f);

renderdoc/os/posix/posix_stringio.cpp

@@ -373,6 +373,14 @@ int fclose(FILE *f)
   return ::fclose(f);
 }
 
+bool exists(const char *filename)
+{
+  struct ::stat st;
+  int res = stat(filename, &st);
+
+  return (res == 0);
+}
+
 void *logfile_open(const char *filename)
 {
   int fd = open(filename, O_APPEND | O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);

renderdoc/os/win32/win32_stringio.cpp

@@ -466,6 +466,16 @@ FILE *fopen(const char *filename, const char *mode)
   return ret;
 }
 
+bool exists(const char *filename)
+{
+  wstring wfn = StringFormat::UTF82Wide(filename);
+
+  struct _stat st;
+  int res = _wstat(wfn.c_str(), &st);
+
+  return (res == 0);
+}
+
 string getline(FILE *f)
 {
   string ret;