Initial community commit

Src/nsmkv/file_mkv_reader.cpp

@@ -0,0 +1,55 @@
+#include "file_mkv_reader.h"
+
+MKVReaderFILE::MKVReaderFILE(FILE *f) : f(f)
+{
+}
+MKVReaderFILE::MKVReaderFILE(const wchar_t *filename)
+{
+	f = _wfopen(filename, L"rb");
+}
+
+int MKVReaderFILE::Read(void *buffer, size_t read_length, size_t *bytes_read)
+{
+	*bytes_read = fread(buffer, 1, read_length, f);
+	return nsmkv::READ_OK;
+}
+
+int MKVReaderFILE::Peek(void *buffer, size_t read_length, size_t *bytes_read)
+{
+	*bytes_read = fread(buffer, 1, read_length, f);
+	fseek(f, (long)(-read_length), SEEK_CUR);
+	return nsmkv::READ_OK;
+}
+
+int MKVReaderFILE::Seek(uint64_t position)
+{
+	fsetpos(f, (const fpos_t *)&position);
+	return nsmkv::READ_OK;
+}
+
+uint64_t MKVReaderFILE::Tell()
+{
+	uint64_t pos;
+	fgetpos(f, (fpos_t *)&pos);
+	return pos;
+}
+
+int MKVReaderFILE::Skip(uint64_t skip_bytes)
+{
+	_fseeki64(f, skip_bytes, SEEK_CUR);
+	return nsmkv::READ_OK;
+}
+
+MKVReaderFILE::~MKVReaderFILE()
+{
+	fclose(f);
+}
+
+uint64_t MKVReaderFILE::GetContentLength() 
+{
+	uint64_t old = Tell();
+	Seek(0);
+	uint64_t content_length = Tell();
+	Seek(old);
+	return content_length; 
+}