EXRTranslator now uses the StreamBuffer class

added StreamBuffer::Position()


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24069 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/translators/exr/IStreamWrapper.cpp

@@ -8,7 +8,7 @@
 
 IStreamWrapper::IStreamWrapper(const char *filename, BPositionIO *stream)
 	: IStream(filename),
-	fStream(stream)
+	fStream(stream, 2048)
 {
 }
 
@@ -21,7 +21,7 @@ IStreamWrapper::~IStreamWrapper()
 bool
 IStreamWrapper::read(char c[/*n*/], int n)
 {
-	int actual = fStream->Read(c, n);
+	int actual = fStream.Read(c, n);
 	if (actual < B_OK) {
 		
 	}
@@ -32,12 +32,12 @@ IStreamWrapper::read(char c[/*n*/], int n)
 Int64
 IStreamWrapper::tellg()
 {
-	return fStream->Position();
+	return fStream.Position();
 }
 
 
 void
 IStreamWrapper::seekg(Int64 pos)
 {
-	fStream->Seek(pos, SEEK_SET);
+	fStream.Seek(pos);
 }

src/add-ons/translators/exr/IStreamWrapper.h

@@ -8,6 +8,8 @@
 #include <DataIO.h>
 #include <ImfIO.h>
 
+#include "StreamBuffer.h"
+
 using namespace Imf;
 
 class IStreamWrapper : public IStream {
@@ -20,7 +22,7 @@ class IStreamWrapper : public IStream {
 		virtual void        seekg(Int64 pos);
 		
 	private:
-		BPositionIO *fStream;
+		StreamBuffer fStream;
 };
 
 #endif	/* ISTREAM_WRAPPER_H */

src/add-ons/translators/shared/StreamBuffer.cpp

@@ -202,6 +202,33 @@ StreamBuffer::Seek(off_t position)
 	return false;
 }
 
+
+// ---------------------------------------------------------------
+// Position
+//
+// Returns the current position in the stream.
+//
+// Preconditions: fBuffer must be allocated and fBufferSize
+// must be valid
+//
+// Parameters:	
+//
+// Postconditions:
+//
+// Returns: the position
+// ---------------------------------------------------------------
+off_t
+StreamBuffer::Position()
+{
+	off_t position = fStream->Position();
+	if (fToRead)
+		position -= fPos;
+	else
+		position += fLen;
+	return position;
+}
+
+
 // ---------------------------------------------------------------
 // _ReadStream
 //

src/add-ons/translators/shared/StreamBuffer.h

@@ -31,6 +31,8 @@ public:
 	bool Seek(off_t position);
 		// seek the stream to the given position
 	
+	off_t Position();
+		// return the actual position
 private:
 	ssize_t _ReadStream();
 		// Load the stream buffer from the stream