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//
// System.IO.BufferedStream
//
// Author:
// Matt Kimball (matt@kimball.net)
//
namespace System.IO {
public sealed class BufferedStream : Stream {
Stream m_stream;
byte[] m_buffer;
int m_buffer_pos;
int m_buffer_read_ahead;
bool m_buffer_reading;
public BufferedStream(Stream stream) : this(stream, 4096) {
}
public BufferedStream(Stream stream, int buffer_size) {
m_stream = stream;
m_buffer = new byte[buffer_size];
}
public override bool CanRead {
get {
return m_stream.CanRead;
}
}
public override bool CanWrite {
get {
return m_stream.CanWrite;
}
}
public override bool CanSeek {
get {
return m_stream.CanSeek;
}
}
public override long Length {
get {
return m_stream.Length;
}
}
public override long Position {
get {
return m_stream.Position - m_buffer_read_ahead + m_buffer_pos;
}
set {
Flush();
m_stream.Position = value;
}
}
public override void Close() {
Flush();
m_stream.Close();
m_stream = null;
m_buffer = null;
}
public override void Flush() {
if (m_buffer_reading) {
m_stream.Position = Position;
} else {
m_stream.Write(m_buffer, 0, m_buffer_pos);
}
m_buffer_read_ahead = 0;
m_buffer_pos = 0;
}
public override long Seek(long offset, SeekOrigin origin) {
Flush();
return m_stream.Seek(offset, origin);
}
public override void SetLength(long value) {
m_stream.SetLength(value);
}
public override int ReadByte() {
byte[] b = new byte[1];
if (Read(b, 0, 1) == 1) {
return b[0];
} else {
return -1;
}
}
public override void WriteByte(byte value) {
byte[] b = new byte[1];
b[0] = value;
Write(b, 0, 1);
}
public override int Read(byte[] array, int offset, int count) {
if (!m_buffer_reading) {
Flush();
m_buffer_reading = true;
}
if (count <= m_buffer_read_ahead - m_buffer_pos) {
Array.Copy(m_buffer, m_buffer_pos, array, offset, count);
m_buffer_pos += count;
if (m_buffer_pos == m_buffer_read_ahead) {
m_buffer_pos = 0;
m_buffer_read_ahead = 0;
}
return count;
}
int ret = m_buffer_read_ahead - m_buffer_pos;
Array.Copy(m_buffer, m_buffer_pos, array, offset, ret);
m_buffer_pos = 0;
m_buffer_read_ahead = 0;
offset += ret;
count -= ret;
if (count >= m_buffer.Length) {
ret += m_stream.Read(array, offset, count);
} else {
m_buffer_read_ahead = m_stream.Read(m_buffer, 0, m_buffer.Length);
if (count < m_buffer_read_ahead) {
Array.Copy(m_buffer, 0, array, offset, count);
m_buffer_pos = count;
ret += count;
} else {
Array.Copy(m_buffer, 0, array, offset, m_buffer_read_ahead);
ret += m_buffer_read_ahead;
m_buffer_read_ahead = 0;
}
}
return ret;
}
public override void Write(byte[] array, int offset, int count) {
if (m_buffer_reading) {
Flush();
m_buffer_reading = false;
}
if (m_buffer_pos + count >= m_buffer.Length) {
Flush();
m_stream.Write(array, offset, count);
} else {
Array.Copy(array, offset, m_buffer, m_buffer_pos, count);
m_buffer_pos += count;
}
}
}
}
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