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(LsbBitStream): support up to 32 bit sequences.

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This commit is contained in:
morkt 2018-09-13 20:51:30 +04:00
parent a775bfe557
commit 652037f878
1 changed files with 32 additions and 11 deletions
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43
ArcFormats/BitStream.cs
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@ -117,19 +117,40 @@ namespace GameRes.Formats
public int GetBits (int count)
{
Debug.Assert (count <= 24, "LsbBitStream does not support sequences longer than 24 bits");
while (m_cached_bits < count)
Debug.Assert (count <= 32, "LsbBitStream does not support sequences longer than 32 bits");
int value;
if (m_cached_bits >= count)
{
int b = m_input.ReadByte();
if (-1 == b)
return -1;
m_bits |= b << m_cached_bits;
m_cached_bits += 8;
int mask = (1 << count) - 1;
value = m_bits & mask;
m_bits = (int)((uint)m_bits >> count);
m_cached_bits -= count;
}
else
{
value = m_bits & ((1 << m_cached_bits) - 1);
count -= m_cached_bits;
int shift = m_cached_bits;
m_cached_bits = 0;
while (count >= 8)
{
int b = m_input.ReadByte();
if (-1 == b)
return -1;
value |= b << shift;
shift += 8;
count -= 8;
}
if (count > 0)
{
int b = m_input.ReadByte();
if (-1 == b)
return -1;
value |= (b & ((1 << count) - 1)) << shift;
m_bits = b >> count;
m_cached_bits = 8 - count;
}
}
int mask = (1 << count) - 1;
int value = m_bits & mask;
m_bits = (int)((uint)m_bits >> count);
m_cached_bits -= count;
return value;
}