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(WwaInput): implemented WWA decoder.

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This commit is contained in:
morkt 2015-08-18 00:18:40 +04:00
parent f5211b18c3
commit 718c20eb3d
1 changed files with 70 additions and 15 deletions
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83
ArcFormats/AudioWWA.cs
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@ -133,26 +133,81 @@ namespace GameRes.Formats.WildBug
#endregion
}
internal class WwaReader
internal class WwaReader : WpxDecoder
{
Stream m_input;
int m_packed_size;
byte[] m_output;
public byte[] Data { get { return m_output; } }
public WwaReader (Stream input, WpxSection section)
public WwaReader (Stream input, WpxSection section) : base (input, section)
{
m_input = input;
m_input.Position = section.Offset;
m_packed_size = section.PackedSize;
m_output = new byte[section.UnpackedSize];
ResetInput();
}
public byte[] Unpack (int format)
public byte[] Unpack (int flags) // sub_46B16C
{
if (0 == (flags & 0x80) && 0 != PackedSize)
{
if (0 != (flags & 8))
{
if (0 != (flags & 4))
throw new NotImplementedException ();
// sub_46B9B7 ??
else if (0 != (flags & 2))
return UnpackVB(); // sub_461B34
}
throw new NotImplementedException ();
}
else
return ReadUncompressed();
}
byte[] UnpackVB ()
{
m_available = FillBuffer();
if (0 == m_available)
return null;
var ref_table = new byte[0x10000];
int v6 = -1 & 3;
m_output[0] = m_buffer[0];
int dst = 1;
int remaining = m_output.Length - 1;
m_current = 1 + v6 + 128;
if (!FillRefTable (ref_table, 1 + v6))
return null;
while (remaining > 0)
{
while (0 != GetNextBit())
{
int v23 = 0;
int v24 = 0;
int v25 = 16384;
for (;;)
{
++v23;
if (0 != GetNextBit())
v24 |= v25;
if (ref_table[2 * v24] == v23)
break;
v25 >>= 1;
if (0 == v25)
return null;
}
m_output[dst++] = ref_table[2 * v24 + 1];
--remaining;
if (0 == remaining)
return m_output;
}
int v26 = ReadNext();
int src_offset = dst - v26 - 1;
int count = 2;
if (0 == GetNextBit())
{
count += ReadCount();
}
if (remaining < count)
return null;
Binary.CopyOverlapped (m_output, src_offset, dst, count);
dst += count;
remaining -= count;
}
return m_output;
}
}
}