first commit

Minecraft.World/ConsoleSaveFileInputStream.cpp

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+#include "stdafx.h"
+
+#include "File.h"
+#include "ConsoleSaveFile.h"
+#include "ConsoleSaveFileInputStream.h"
+
+ConsoleSaveFileInputStream::ConsoleSaveFileInputStream(ConsoleSaveFile *saveFile, const ConsoleSavePath &file)
+{
+	m_saveFile = saveFile;
+	m_file = m_saveFile->createFile( file );
+
+	m_saveFile->setFilePointer( m_file, 0, NULL, FILE_BEGIN );
+}
+
+ConsoleSaveFileInputStream::ConsoleSaveFileInputStream(ConsoleSaveFile *saveFile, FileEntry *file)
+{
+	m_saveFile = saveFile;
+	m_file = file;
+
+	m_saveFile->setFilePointer( m_file, 0, NULL, FILE_BEGIN );
+}
+
+//Reads a byte of data from this input stream. This method blocks if no input is yet available.
+//Returns:
+//the next byte of data, or -1 if the end of the file is reached.
+int ConsoleSaveFileInputStream::read()
+{
+	byte byteRead = 0;
+	DWORD numberOfBytesRead;
+
+	BOOL result = m_saveFile->readFile(
+		m_file,
+		&byteRead, // data buffer
+		1, // number of bytes to read
+		&numberOfBytesRead // number of bytes read
+		);
+
+	if( result == 0 )
+	{
+		// TODO 4J Stu - Some kind of error handling
+		return -1;
+	}
+	else if( numberOfBytesRead == 0 )
+	{
+		// File pointer is past the end of the file
+		return -1;
+	}
+
+	return byteRead;
+}
+
+//Reads up to b.length bytes of data from this input stream into an array of bytes. This method blocks until some input is available.
+//Parameters:
+//b - the buffer into which the data is read.
+//Returns:
+//the total number of bytes read into the buffer, or -1 if there is no more data because the end of the file has been reached.
+int ConsoleSaveFileInputStream::read(byteArray b)
+{
+	DWORD numberOfBytesRead;
+
+	BOOL result = m_saveFile->readFile(
+		m_file,
+		&b.data, // data buffer
+		b.length, // number of bytes to read
+		&numberOfBytesRead // number of bytes read
+		);
+
+	if( result == 0 )
+	{
+		// TODO 4J Stu - Some kind of error handling
+		return -1;
+	}
+	else if( numberOfBytesRead == 0 )
+	{
+		// File pointer is past the end of the file
+		return -1;
+	}
+
+	return numberOfBytesRead;
+}
+
+//Reads up to len bytes of data from this input stream into an array of bytes. If len is not zero, the method blocks until some input
+//is available; otherwise, no bytes are read and 0 is returned.
+//Parameters:
+//b - the buffer into which the data is read.
+//off - the start offset in the destination array b
+//len - the maximum number of bytes read.
+//Returns:
+//the total number of bytes read into the buffer, or -1 if there is no more data because the end of the file has been reached.
+int ConsoleSaveFileInputStream::read(byteArray b, unsigned int offset, unsigned int length)
+{
+	// 4J Stu - We don't want to read any more than the array buffer can hold
+	assert( length <= ( b.length - offset ) );
+
+	DWORD numberOfBytesRead;
+
+	BOOL result = m_saveFile->readFile(
+		m_file,
+		&b[offset], // data buffer
+		length, // number of bytes to read
+		&numberOfBytesRead // number of bytes read
+		);
+
+	if( result == 0 )
+	{
+		// TODO 4J Stu - Some kind of error handling
+		return -1;
+	}
+	else if( numberOfBytesRead == 0 )
+	{
+		// File pointer is past the end of the file
+		return -1;
+	}
+
+	return numberOfBytesRead;
+}
+
+//Closes this file input stream and releases any system resources associated with the stream.
+//If this stream has an associated channel then the channel is closed as well.
+void ConsoleSaveFileInputStream::close()
+{
+	if( m_saveFile != NULL )
+	{
+		BOOL result = m_saveFile->closeHandle( m_file );
+
+		if( result == 0 )
+		{
+			// TODO 4J Stu - Some kind of error handling
+		}
+
+		// Stop the dtor from trying to close it again
+		m_saveFile = NULL;
+	}
+}