Initial community commit

Src/external_dependencies/libmp4v2/virtual_io.cpp

@@ -0,0 +1,92 @@
+/*
+ * The contents of this file are subject to the Mozilla Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/MPL/
+ * 
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ * 
+ * The Original Code is MPEG4IP.
+ * 
+ * The Initial Developer of the Original Code is Cisco Systems Inc.
+ * Portions created by Cisco Systems Inc. are
+ * Copyright (C) Cisco Systems Inc. 2001 - 2005.  All Rights Reserved.
+ * 
+ * Contributor(s): 
+ *		Ben Allison			benski at nullsoft.com
+ *
+ * Virtual I/O support, for file support other than fopen/fread/fwrite
+ */
+
+#include "mp4common.h"
+#include "virtual_io.h"
+
+/* --------- Virtual IO for FILE * --------- */
+
+u_int64_t FILE_GetFileLength(void *user)
+{
+	FILE *fp = (FILE *)user;
+	struct stat s;
+	if (fstat(fileno(fp), &s) < 0) { 
+		throw new MP4Error(errno, "stat failed", "MP4Open");
+	}
+	return s.st_size;
+}
+
+int FILE_SetPosition(void *user, u_int64_t position)
+{
+	FILE *fp = (FILE *)user;
+	fpos_t fpos;
+	VAR_TO_FPOS(fpos, position);
+	return fsetpos(fp, &fpos);
+}
+
+int FILE_GetPosition(void *user, u_int64_t *position)
+{
+	FILE *fp = (FILE *)user;
+	fpos_t fpos;
+	if (fgetpos(fp, &fpos) < 0) { 
+		throw new MP4Error(errno, "MP4GetPosition");
+	}
+	
+	FPOS_TO_VAR(fpos, u_int64_t, *position);
+	return 0;
+}
+
+size_t FILE_Read(void *user, void *buffer, size_t size)
+{
+	FILE *fp = (FILE *)user;
+	return fread(buffer, 1, size, fp);
+}
+
+size_t FILE_Write(void *user, void *buffer, size_t size)
+{
+	FILE *fp = (FILE *)user;
+	return fwrite(buffer, 1, size, fp); 
+}
+
+int FILE_EndOfFile(void *user)
+{
+	FILE *fp = (FILE *)user;
+	return feof(fp);
+}
+
+int FILE_Close(void *user)
+{
+	FILE *fp = (FILE *)user;
+	return fclose(fp);
+}
+
+Virtual_IO FILE_virtual_IO =
+{
+	FILE_GetFileLength,
+		FILE_SetPosition,
+		FILE_GetPosition,
+		FILE_Read,
+		FILE_Write,
+		FILE_EndOfFile,
+		FILE_Close,
+};