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(ArPkStream.Read): optimized with BinarySearch.

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This commit is contained in:
morkt 2018-01-29 06:20:16 +04:00
parent 13da37b2d9
commit 482e679e58
1 changed files with 11 additions and 4 deletions
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15
ArcFormats/PalmTree/ArcAR.cs
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@ -94,19 +94,26 @@ namespace GameRes.Formats.PalmTree
this.Position = pos;
}
count = BaseStream.Read (buffer, offset, count);
if (0 == count)
return count;
long buf_pos = pos;
long buf_end = buf_pos + count;
foreach (long ar_pos in m_ar_blocks)
int index = m_ar_blocks.BinarySearch (buf_pos-1);
if (index < 0)
index = ~index;
for (; index < m_ar_blocks.Count; ++index)
{
var ar_pos = m_ar_blocks[index];
if (buf_end <= ar_pos)
break;
if (buf_pos >= ar_pos+2)
continue;
int signature_pos = (int)(ar_pos - pos);
if (signature_pos >= 0)
buffer[offset+signature_pos ] = (byte)'P';
if (signature_pos + 1 >= 0)
buffer[offset+signature_pos+1] = (byte)'K';
buffer[offset+signature_pos] = (byte)'P';
++signature_pos;
if (signature_pos >= 0 && signature_pos < count)
buffer[offset+signature_pos] = (byte)'K';
buf_pos = ar_pos + 2;
}
return count;