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(ArcView.Frame.UnsafeCopy): new private method.

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This commit is contained in:
morkt 2016-12-23 23:17:53 +04:00
parent 882f3ec461
commit 9819218271
1 changed files with 15 additions and 12 deletions
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27
GameRes/ArcView.cs
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@ -108,9 +108,10 @@ namespace GameRes
return ptr; return ptr;
} }
[DllImport("kernel32.dll", SetLastError = true)] [DllImport("kernel32.dll", SetLastError = false)]
internal static extern void GetSystemInfo (ref SYSTEM_INFO lpSystemInfo); internal static extern void GetSystemInfo (ref SYSTEM_INFO lpSystemInfo);
[StructLayout (LayoutKind.Sequential)]
internal struct SYSTEM_INFO internal struct SYSTEM_INFO
{ {
internal int dwOemId; internal int dwOemId;
@ -354,19 +355,20 @@ namespace GameRes
int total = (int)Math.Min (Reserve (offset, count), count); int total = (int)Math.Min (Reserve (offset, count), count);
if (buf.Length - buf_offset < total) if (buf.Length - buf_offset < total)
throw new ArgumentException ("Buffer offset and length are out of bounds."); throw new ArgumentException ("Buffer offset and length are out of bounds.");
UnsafeCopy (offset, buf, buf_offset, total);
unsafe
{
byte* ptr = m_view.GetPointer (m_offset);
try {
Marshal.Copy ((IntPtr)(ptr+(offset-m_offset)), buf, buf_offset, total);
} finally {
m_view.SafeMemoryMappedViewHandle.ReleasePointer();
}
}
return total; return total;
} }
private unsafe void UnsafeCopy (long offset, byte[] buf, int buf_offset, int count)
{
byte* ptr = m_view.GetPointer (m_offset);
try {
Marshal.Copy ((IntPtr)(ptr+(offset-m_offset)), buf, buf_offset, count);
} finally {
m_view.SafeMemoryMappedViewHandle.ReleasePointer();
}
}
/// <summary> /// <summary>
/// Read <paramref name="count"/> bytes starting from <paramref name="offset"/> into byte array and return that array. /// Read <paramref name="count"/> bytes starting from <paramref name="offset"/> into byte array and return that array.
/// Returned array could be less than <paramref name="count"/> bytes length if end of the mapped file was reached. /// Returned array could be less than <paramref name="count"/> bytes length if end of the mapped file was reached.
@ -375,7 +377,8 @@ namespace GameRes
{ {
count = Math.Min (count, Reserve (offset, count)); count = Math.Min (count, Reserve (offset, count));
var data = new byte[count]; var data = new byte[count];
Read (offset, data, 0, count); if (count != 0)
UnsafeCopy (offset, data, 0, data.Length);
return data; return data;
} }