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https://github.com/crskycode/GARbro.git
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(ArcView.ArcStream): added bufferization.
This commit is contained in:
morkt
parent
2c7b82535e
commit
68aad58569
@ -24,6 +24,7 @@
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//
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using System;
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using System.Diagnostics;
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using System.IO;
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using System.IO.MemoryMappedFiles;
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using System.Runtime.InteropServices;
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@ -462,6 +463,11 @@ namespace GameRes
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return ReadString (offset, size, Encodings.cp932);
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}
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public unsafe ViewPointer GetPointer ()
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{
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return new ViewPointer (m_view, m_offset);
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}
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#region IDisposable Members
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bool disposed = false;
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@ -489,10 +495,15 @@ namespace GameRes
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public class ArcStream : Stream, IBinaryStream
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{
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private Frame m_view;
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private long m_start;
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private long m_size;
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private readonly Frame m_view;
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private readonly long m_start;
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private readonly long m_size;
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private long m_position;
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private byte[] m_buffer;
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private int m_buffer_pos; // read position within buffer
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private int m_buffer_len; // length of bytes read in buffer
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private const int DefaultBufferSize = 0x1000;
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public string Name { get; set; }
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public uint Signature { get { return ReadSignature(); } }
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@ -504,8 +515,21 @@ namespace GameRes
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public override long Length { get { return m_size; } }
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public override long Position
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{
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get { return m_position; }
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set { m_position = Math.Max (value, 0); }
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get { return m_position + (m_buffer_pos - m_buffer_len); }
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set {
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if (value < 0)
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throw new ArgumentOutOfRangeException ("value", "Stream position is out of range.");
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var buffer_start = m_position - m_buffer_len;
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if (m_buffer_pos != m_buffer_len && value >= buffer_start && value < m_position)
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{
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m_buffer_pos = (int)(value - buffer_start);
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}
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else
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{
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m_position = value;
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m_buffer_pos = m_buffer_len = 0;
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}
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}
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}
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public ArcStream (ArcView file)
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@ -569,18 +593,61 @@ namespace GameRes
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return new CowArray<byte> (m_header, 0, size);
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}
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private void RefillBuffer ()
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{
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if (null == m_buffer)
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m_buffer = new byte[DefaultBufferSize];
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uint length = (uint)Math.Min (m_size - m_position, m_buffer.Length);
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m_buffer_len = m_view.Read (m_start + m_position, m_buffer, 0, length);
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m_position += m_buffer_len;
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m_buffer_pos = 0;
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}
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private void FlushBuffer ()
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{
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if (m_buffer_len != 0)
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{
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m_position += m_buffer_pos - m_buffer_len;
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m_buffer_pos = m_buffer_len = 0;
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}
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}
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private void EnsureAvailable (int length)
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{
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if (m_buffer_pos + length > m_buffer_len)
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{
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FlushBuffer();
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if (m_position + length > m_size)
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throw new EndOfStreamException();
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RefillBuffer();
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}
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}
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private int ReadFromBuffer (byte[] array, int offset, int count)
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{
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int available = Math.Min (m_buffer_len - m_buffer_pos, count);
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if (available > 0)
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{
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Buffer.BlockCopy (m_buffer, m_buffer_pos, array, offset, available);
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m_buffer_pos += available;
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}
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return available;
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}
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public int PeekByte ()
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{
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if (m_position >= m_size)
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if (m_buffer_pos == m_buffer_len)
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RefillBuffer();
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if (m_buffer_pos == m_buffer_len)
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return -1;
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return m_view.ReadByte (m_start+m_position);
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return m_buffer[m_buffer_pos];
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}
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public override int ReadByte ()
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{
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int b = PeekByte();
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if (-1 != b)
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++m_position;
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++m_buffer_pos;
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return b;
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}
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@ -599,10 +666,9 @@ namespace GameRes
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public short ReadInt16 ()
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{
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if (m_position + 2 > m_size)
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throw new EndOfStreamException();
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var v = m_view.ReadInt16 (m_start+m_position);
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m_position += 2;
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EnsureAvailable (2);
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var v = m_buffer.ToInt16 (m_buffer_pos);
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m_buffer_pos += 2;
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return v;
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}
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@ -613,20 +679,17 @@ namespace GameRes
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public int ReadInt24 ()
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{
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if (m_position + 3 > m_size)
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throw new EndOfStreamException();
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int v = m_view.ReadUInt16 (m_start+m_position);
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v |= m_view.ReadByte (m_start+m_position+2) << 16;
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m_position += 3;
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EnsureAvailable (3);
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int v = m_buffer.ToInt24 (m_buffer_pos);
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m_buffer_pos += 3;
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return v;
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}
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public int ReadInt32 ()
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{
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if (m_position + 4 > m_size)
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throw new EndOfStreamException();
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var v = m_view.ReadInt32 (m_start+m_position);
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m_position += 4;
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EnsureAvailable (4);
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int v = m_buffer.ToInt32 (m_buffer_pos);
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m_buffer_pos += 4;
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return v;
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}
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@ -637,10 +700,9 @@ namespace GameRes
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public long ReadInt64 ()
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{
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if (m_position + 8 > m_size)
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throw new EndOfStreamException();
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var v = m_view.ReadInt64 (m_start+m_position);
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m_position += 8;
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EnsureAvailable (8);
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var v = m_buffer.ToInt64 (m_buffer_pos);
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m_buffer_pos += 8;
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return v;
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}
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@ -649,8 +711,6 @@ namespace GameRes
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return (ulong)ReadInt64();
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}
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byte[] m_string_buf;
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public string ReadCString (int length)
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{
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return ReadCString (length, Encodings.cp932);
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@ -658,11 +718,39 @@ namespace GameRes
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public string ReadCString (int length, Encoding enc)
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{
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if (null == m_string_buf || m_string_buf.Length < length)
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m_string_buf = new byte[Math.Max (length, 0x20)];
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length = Read (m_string_buf, 0, length);
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return Binary.GetCString (m_string_buf, 0, length);
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if (m_buffer_pos == m_buffer_len && length <= DefaultBufferSize)
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RefillBuffer();
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if (m_buffer_pos + length <= m_buffer_len)
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{
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// whole string fit into buffer
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var str = Binary.GetCString (m_buffer, m_buffer_pos, length, enc);
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m_buffer_pos += length;
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return str;
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}
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else if (length > DefaultBufferSize)
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{
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// requested string length is larger than internal buffer size
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var string_buffer = ReadBytes (length);
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return Binary.GetCString (string_buffer, 0, string_buffer.Length, enc);
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}
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else
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{
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int available = m_buffer_len - m_buffer_pos;
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if (available > 0 && m_buffer_pos != 0)
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Buffer.BlockCopy (m_buffer, m_buffer_pos, m_buffer, 0, available);
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else if (null == m_buffer)
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m_buffer = new byte[DefaultBufferSize];
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int count = (int)Math.Min (m_buffer.Length - available, m_size - m_position);
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if (count > 0)
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{
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int read = m_view.Read (m_start + m_position, m_buffer, available, (uint)count);
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m_position += read;
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available += read;
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}
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m_buffer_len = available;
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m_buffer_pos = Math.Min (length, m_buffer_len);
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return Binary.GetCString (m_buffer, 0, m_buffer_pos, enc);
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}
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}
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public string ReadCString ()
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@ -672,48 +760,95 @@ namespace GameRes
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public string ReadCString (Encoding enc)
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{
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if (null == m_string_buf)
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m_string_buf = new byte[0x20];
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int size = 0;
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if (m_buffer_pos == m_buffer_len)
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RefillBuffer();
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int available = m_buffer_len - m_buffer_pos;
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if (0 == available)
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return string.Empty;
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int zero = Array.IndexOf<byte> (m_buffer, 0, m_buffer_pos, available);
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if (zero != -1)
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{
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// null byte found within buffer
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var str = enc.GetString (m_buffer, m_buffer_pos, zero - m_buffer_pos);
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m_buffer_pos = zero+1;
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return str;
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}
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// underlying view includes whole stream
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if (m_view.Offset <= m_start && m_view.Offset + m_view.Reserved >= m_start + m_size)
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return ReadCStringUnsafe (enc, available);
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var string_buf = new byte[Math.Max (0x20, available * 2)];
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ReadFromBuffer (string_buf, 0, available);
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int size = available;
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for (;;)
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{
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int b = ReadByte();
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if (-1 == b || 0 == b)
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break;
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if (m_string_buf.Length == size)
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if (string_buf.Length == size)
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{
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Array.Resize (ref m_string_buf, checked(size*3/2));
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Array.Resize (ref string_buf, checked(size*3/2));
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}
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m_string_buf[size++] = (byte)b;
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string_buf[size++] = (byte)b;
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}
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return enc.GetString (string_buf, 0, size);
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}
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private unsafe string ReadCStringUnsafe (Encoding enc, int skip_bytes = 0)
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{
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Debug.Assert (m_view.Offset + m_view.Reserved >= m_start + m_size);
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FlushBuffer();
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using (var ptr = m_view.GetPointer())
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{
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byte* s = ptr.Value + (m_start - m_view.Offset + m_position);
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int view_length = (int)(m_size - m_position);
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int string_length = Math.Min (skip_bytes, view_length);
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while (string_length < view_length && 0 != s[string_length])
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{
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++string_length;
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}
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m_position += string_length;
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if (string_length < view_length)
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++m_position;
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// return enc.GetString (s, string_length); // .Net v4.6+ only
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var string_buf = new byte[string_length];
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Marshal.Copy ((IntPtr)s, string_buf, 0, string_length);
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return enc.GetString (string_buf, 0, string_length);
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}
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return enc.GetString (m_string_buf, 0, size);
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}
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public byte[] ReadBytes (int count)
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{
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if (m_position >= m_size)
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if (m_buffer_pos + count <= m_buffer_len && m_buffer_len != 0)
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{
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var data = new CowArray<byte> (m_buffer, m_buffer_pos, count).ToArray();
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m_buffer_pos += count;
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return data;
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}
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var current_pos = Position;
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if (0 == count || current_pos >= m_size)
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return new byte[0];
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var bytes = m_view.ReadBytes (m_start+m_position, (uint)Math.Min (count, m_size - m_position));
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m_position += bytes.Length;
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var bytes = m_view.ReadBytes (m_start+current_pos, (uint)Math.Min (count, m_size - current_pos));
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Position = current_pos + bytes.Length;
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return bytes;
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}
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#region System.IO.Stream methods
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public override void Flush()
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{
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FlushBuffer();
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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switch (origin)
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{
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case SeekOrigin.Begin: m_position = offset; break;
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case SeekOrigin.Current: m_position += offset; break;
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case SeekOrigin.End: m_position = m_size + offset; break;
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case SeekOrigin.Begin: Position = offset; break;
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case SeekOrigin.Current: Position += offset; break;
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case SeekOrigin.End: Position = m_size + offset; break;
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}
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if (m_position < 0)
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m_position = 0;
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return m_position;
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return Position;
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}
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public override void SetLength (long length)
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@ -723,12 +858,26 @@ namespace GameRes
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public override int Read (byte[] buffer, int offset, int count)
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{
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if (m_position >= m_size)
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return 0;
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count = (int)Math.Min (count, m_size - m_position);
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int read = m_view.Read (m_start + m_position, buffer, offset, (uint)count);
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m_position += read;
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return read;
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int read_from_buffer = ReadFromBuffer (buffer, offset, count);
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offset += read_from_buffer;
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count -= read_from_buffer;
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if (0 == count || m_position >= m_size)
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return read_from_buffer;
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if (count < DefaultBufferSize)
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{
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RefillBuffer();
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count = Math.Min (count, m_buffer_len);
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Buffer.BlockCopy (m_buffer, m_buffer_pos, buffer, offset, count);
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m_buffer_pos += count;
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return read_from_buffer + count;
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}
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else
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{
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uint view_count = (uint)Math.Min (count, m_size - m_position);
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int read_from_view = m_view.Read (m_start + m_position, buffer, offset, view_count);
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m_position += read_from_view;
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return read_from_buffer + read_from_view;
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}
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}
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public override void Write (byte[] buffer, int offset, int count)
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