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(ArcView): added constructor from IO.Stream.

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This commit is contained in:
morkt 2015-06-08 19:21:31 +04:00
parent 34a2391811
commit 7f8b091d05
1 changed files with 67 additions and 9 deletions
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64
GameRes/ArcView.cs
View File

@ -2,7 +2,7 @@
//! \date Mon Jul 07 10:31:10 2014
//! \brief Memory mapped view of gameres file.
//
// Copyright (C) 2014 by morkt
// Copyright (C) 2014-2015 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
@ -78,6 +78,8 @@ namespace GameRes
{
static public string ReadString (this MemoryMappedViewAccessor view, long offset, uint size, Encoding enc)
{
if (0 == size)
return string.Empty;
byte[] buffer = new byte[size];
uint n;
for (n = 0; n < size; ++n)
@ -144,7 +146,23 @@ namespace GameRes
{
Name = name;
MaxOffset = fs.Length;
m_map = MemoryMappedFile.CreateFromFile (fs, null, 0,
InitFromFileStream (fs, 0);
}
}
public ArcView (Stream input, string name, uint length)
{
Name = name;
MaxOffset = length;
if (input is FileStream)
InitFromFileStream (input as FileStream, length);
else
InitFromStream (input, length);
}
private void InitFromFileStream (FileStream fs, uint length)
{
m_map = MemoryMappedFile.CreateFromFile (fs, null, length,
MemoryMappedFileAccess.Read, null, HandleInheritability.None, true);
try {
View = new Frame (this);
@ -153,6 +171,46 @@ namespace GameRes
throw;
}
}
private void InitFromStream (Stream input, uint length)
{
m_map = MemoryMappedFile.CreateNew (null, length, MemoryMappedFileAccess.ReadWrite,
MemoryMappedFileOptions.None, null, HandleInheritability.None);
try
{
using (var view = m_map.CreateViewAccessor (0, length, MemoryMappedFileAccess.Write))
{
var buffer = new byte[81920];
unsafe
{
byte* ptr = view.GetPointer (0);
try
{
uint total = 0;
while (total < length)
{
int read = input.Read (buffer, 0, buffer.Length);
if (0 == read)
break;
read = (int)Math.Min (read, length-total);
Marshal.Copy (buffer, 0, (IntPtr)(ptr+total), read);
total += (uint)read;
}
MaxOffset = total;
}
finally
{
view.SafeMemoryMappedViewHandle.ReleasePointer();
}
}
}
View = new Frame (this);
}
catch
{
m_map.Dispose();
throw;
}
}
public Frame CreateFrame ()
@ -351,7 +409,7 @@ namespace GameRes
public string ReadString (long offset, uint size, Encoding enc)
{
Reserve (offset, size);
size = Math.Min (size, Reserve (offset, size));
return m_view.ReadString (offset-m_offset, size, enc);
}