add example_util.[hc]
moves ReadFile to a common location
Change-Id: Ia81230671f16d7d4d218b9954a5be55577a85413
diff --git a/examples/example_util.c b/examples/example_util.c
new file mode 100644
index 0000000..65655fd
--- /dev/null
+++ b/examples/example_util.c
@@ -0,0 +1,59 @@
+// Copyright 2012 Google Inc. All Rights Reserved.
+//
+// This code is licensed under the same terms as WebM:
+// Software License Agreement: http://www.webmproject.org/license/software/
+// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
+// -----------------------------------------------------------------------------
+//
+// Utility functions used by the example programs.
+//
+
+#include "./example_util.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+// -----------------------------------------------------------------------------
+// File I/O
+
+int ExUtilReadFile(const char* const file_name,
+ const uint8_t** data, size_t* data_size) {
+ int ok;
+ void* file_data;
+ size_t file_size;
+ FILE* in;
+
+ if (file_name == NULL || data == NULL || data_size == NULL) return 0;
+ *data = NULL;
+ *data_size = 0;
+
+ in = fopen(file_name, "rb");
+ if (in == NULL) {
+ fprintf(stderr, "cannot open input file '%s'\n", file_name);
+ return 0;
+ }
+ fseek(in, 0, SEEK_END);
+ file_size = ftell(in);
+ fseek(in, 0, SEEK_SET);
+ file_data = malloc(file_size);
+ if (file_data == NULL) return 0;
+ ok = (fread(file_data, file_size, 1, in) == 1);
+ fclose(in);
+
+ if (!ok) {
+ fprintf(stderr, "Could not read %zu bytes of data from file %s\n",
+ file_size, file_name);
+ free(file_data);
+ return 0;
+ }
+ *data = (uint8_t*)file_data;
+ *data_size = file_size;
+ return 1;
+}
+
+#if defined(__cplusplus) || defined(c_plusplus)
+} // extern "C"
+#endif