Basic BDataIO binding for MatroskaParser

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9732 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/media/plugins/matroska/libMatroskaParser/Jamfile

@@ -4,4 +4,5 @@ UseLibraryHeaders zlib ;
 
 StaticLibrary MatroskaParser :
 	MatroskaParser.c
+	StreamIO.cpp
 ;

src/add-ons/media/plugins/matroska/libMatroskaParser/StreamIO.cpp

@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <malloc.h>
+
+#include "StreamIO.h"
+
+
+static int
+stream_read(struct FileCache *cc, ulonglong pos, void *buffer, int count)
+{
+	return reinterpret_cast<StreamIO *>(cc)->source->ReadAt(pos, buffer, count);
+}
+
+
+static longlong
+stream_scan(struct FileCache *cc,ulonglong start,unsigned signature)
+{
+	return 0;
+}
+
+
+static void
+stream_close(struct FileCache *cc)
+{
+}
+
+
+static unsigned
+stream_getsize(struct FileCache *cc)
+{
+	return reinterpret_cast<StreamIO *>(cc)->source->Seek(0, SEEK_END);
+}
+
+
+static const char *
+stream_geterror(struct FileCache *cc)
+{
+	return "";
+}
+
+
+FileCache *
+CreateFileCache(BDataIO *dataio)
+{
+	BPositionIO *posio;
+	posio = dynamic_cast<BPositionIO *>(dataio);
+	if (!posio)
+		return NULL;
+	
+	StreamIO *io;
+	io = (StreamIO *)malloc(sizeof(StreamIO));
+	if (!io)
+		return NULL;
+
+	io->source = posio;
+	io->filecache.read = &stream_read;
+	io->filecache.scan = &stream_scan;
+	io->filecache.close = &stream_close;
+	io->filecache.getsize = &stream_getsize;
+	io->filecache.geterror = &stream_geterror;
+	
+	return reinterpret_cast<FileCache *>(io);
+}
+

src/add-ons/media/plugins/matroska/libMatroskaParser/StreamIO.h

@@ -0,0 +1,11 @@
+
+#include <DataIO.h>
+
+#include "MatroskaParser.h"
+
+struct StreamIO {
+	FileCache 	filecache;
+	BPositionIO *source;
+};
+
+FileCache *CreateFileCache(BDataIO *dataio);