Index: source/libvpx/third_party/libwebm/mkvreader.cpp |
=================================================================== |
--- source/libvpx/third_party/libwebm/mkvreader.cpp (revision 0) |
+++ source/libvpx/third_party/libwebm/mkvreader.cpp (revision 0) |
@@ -0,0 +1,143 @@ |
+// Copyright (c) 2010 The WebM project authors. All Rights Reserved. |
+// |
+// Use of this source code is governed by a BSD-style license |
+// that can be found in the LICENSE file in the root of the source |
+// tree. An additional intellectual property rights grant can be found |
+// in the file PATENTS. All contributing project authors may |
+// be found in the AUTHORS file in the root of the source tree. |
+ |
+#include "mkvreader.hpp" |
+ |
+#include <cassert> |
+ |
+namespace mkvparser |
+{ |
+ |
+MkvReader::MkvReader() : |
+ m_file(NULL), |
+ reader_owns_file_(true) { |
+} |
+ |
+MkvReader::MkvReader(FILE* fp) : |
+ m_file(fp), |
+ reader_owns_file_(false) { |
+ GetFileSize(); |
+} |
+ |
+MkvReader::~MkvReader() { |
+ if (reader_owns_file_) |
+ Close(); |
+ m_file = NULL; |
+} |
+ |
+int MkvReader::Open(const char* fileName) |
+{ |
+ if (fileName == NULL) |
+ return -1; |
+ |
+ if (m_file) |
+ return -1; |
+ |
+#ifdef _MSC_VER |
+ const errno_t e = fopen_s(&m_file, fileName, "rb"); |
+ |
+ if (e) |
+ return -1; //error |
+#else |
+ m_file = fopen(fileName, "rb"); |
+ |
+ if (m_file == NULL) |
+ return -1; |
+#endif |
+ return !GetFileSize(); |
+} |
+ |
+bool MkvReader::GetFileSize() { |
+ if (m_file == NULL) |
+ return false; |
+#ifdef _MSC_VER |
+ int status = _fseeki64(m_file, 0L, SEEK_END); |
+ |
+ if (status) |
+ return false; //error |
+ |
+ m_length = _ftelli64(m_file); |
+#else |
+ fseek(m_file, 0L, SEEK_END); |
+ m_length = ftell(m_file); |
+#endif |
+ assert(m_length >= 0); |
+ |
+ if (m_length < 0) |
+ return false; |
+ |
+#ifdef _MSC_VER |
+ status = _fseeki64(m_file, 0L, SEEK_SET); |
+ |
+ if (status) |
+ return false; //error |
+#else |
+ fseek(m_file, 0L, SEEK_SET); |
+#endif |
+ |
+ return true; |
+} |
+ |
+void MkvReader::Close() |
+{ |
+ if (m_file != NULL) |
+ { |
+ fclose(m_file); |
+ m_file = NULL; |
+ } |
+} |
+ |
+int MkvReader::Length(long long* total, long long* available) |
+{ |
+ if (m_file == NULL) |
+ return -1; |
+ |
+ if (total) |
+ *total = m_length; |
+ |
+ if (available) |
+ *available = m_length; |
+ |
+ return 0; |
+} |
+ |
+int MkvReader::Read(long long offset, long len, unsigned char* buffer) |
+{ |
+ if (m_file == NULL) |
+ return -1; |
+ |
+ if (offset < 0) |
+ return -1; |
+ |
+ if (len < 0) |
+ return -1; |
+ |
+ if (len == 0) |
+ return 0; |
+ |
+ if (offset >= m_length) |
+ return -1; |
+ |
+#ifdef _MSC_VER |
+ const int status = _fseeki64(m_file, offset, SEEK_SET); |
+ |
+ if (status) |
+ return -1; //error |
+#else |
+ fseek(m_file, offset, SEEK_SET); |
+#endif |
+ |
+ const size_t size = fread(buffer, 1, len, m_file); |
+ |
+ if (size < size_t(len)) |
+ return -1; //error |
+ |
+ return 0; //success |
+} |
+ |
+} //end namespace mkvparser |