From 70a4ca5bc196676e8926028b2187fe7bd2874d42 Mon Sep 17 00:00:00 2001
From: "madmaxoft@gmail.com"
 <madmaxoft@gmail.com@0a769ca7-a7f5-676a-18bf-c427514a06d6>
Date: Fri, 17 Aug 2012 10:18:07 +0000
Subject: Packets now parse themselves from a cByteBuffer object (1st part of
 packeting rewrite, http://forum.mc-server.org/showthread.php?tid=524 )

git-svn-id: http://mc-server.googlecode.com/svn/trunk@744 0a769ca7-a7f5-676a-18bf-c427514a06d6
---
 source/ByteBuffer.h | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 source/ByteBuffer.h

(limited to 'source/ByteBuffer.h')

diff --git a/source/ByteBuffer.h b/source/ByteBuffer.h
new file mode 100644
index 000000000..23be3e922
--- /dev/null
+++ b/source/ByteBuffer.h
@@ -0,0 +1,90 @@
+
+// ByteStream.h
+
+// Interfaces to the cByteBuffer class representing a ringbuffer of bytes
+
+
+
+
+
+#pragma once
+
+
+
+
+
+/** An object that can store incoming bytes and lets its clients read the bytes sequentially
+The bytes are stored in a ringbuffer of constant size; if more than that size
+is requested, the write operation fails.
+The bytes stored can be retrieved using various ReadXXX functions; these assume that the needed
+number of bytes are present in the buffer (ASSERT; for performance reasons).
+The reading doesn't actually remove the bytes, it only moves the internal read ptr.
+To remove the bytes, call CommitRead().
+To re-start reading from the beginning, call ResetRead().
+This class doesn't implement thread safety, the clients of this class need to provide
+their own synchronization.
+*/
+class cByteBuffer
+{
+public:
+	cByteBuffer(int a_BufferSize);
+	~cByteBuffer();
+	
+	/// Writes the bytes specified to the ringbuffer. Returns true if successful, false if not
+	bool Write(const char * a_Bytes, int a_Count);
+	
+	/// Returns the number of bytes that can be successfully written to the ringbuffer
+	int  GetFreeSpace(void) const;
+	
+	/// Returns the number of bytes that are currently in the ringbuffer. Note GetReadableBytes()
+	int  GetUsedSpace(void) const;
+	
+	/// Returns the number of bytes that are currently available for reading (may be less than UsedSpace due to some data having been read already)
+	int  GetReadableSpace(void) const;
+	
+	/// Returns true if the specified amount of bytes are available for reading
+	bool CanReadBytes(int a_Count) const;
+
+	// Read the specified datatype and advance the read pointer; return true if successfully read:
+	bool ReadChar           (char & a_Value);
+	bool ReadByte           (unsigned char & a_Value);
+	bool ReadBEShort        (short & a_Value);
+	bool ReadBEInt          (int & a_Value);
+	bool ReadBEInt64        (Int64 & a_Value);
+	bool ReadBEFloat        (float & a_Value);
+	bool ReadBEDouble       (double & a_Value);
+	bool ReadBool           (bool & a_Value);
+	bool ReadBEUTF16String16(AString & a_Value);
+	
+	/// Reads a_Count bytes into a_Buffer; return true if successful
+	bool ReadBuf(void * a_Buffer, int a_Count);
+	
+	/// Reads a_Count bytes into a_String; return true if successful
+	bool ReadString(AString & a_String, int a_Count);
+	
+	/// Reads 2 * a_NumChars bytes and interprets it as a UTF16 string, converting it into UTF8 string a_String
+	bool ReadUTF16String(AString & a_String, int a_NumChars);
+	
+	/// Skips reading by a_Count bytes
+	void SkipRead(int a_Count);
+	
+	/// Removes the bytes that have been read from the ringbuffer
+	void CommitRead(void);
+	
+	/// Restarts next reading operation at the start of the ringbuffer
+	void ResetRead(void);
+	
+protected:
+	char * m_Buffer;
+	int    m_BufferSize;  // Total size of the ringbuffer
+	int    m_DataStart;  // Where the data starts in the ringbuffer
+	int    m_WritePos;   // Where the data ends in the ringbuffer
+	int    m_ReadPos;    // Where the next read will start in the ringbuffer
+	
+	/// Advances the m_ReadPos by a_Count bytes
+	void AdvanceReadPos(int a_Count);
+} ;
+
+
+
+
-- 
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