mirror of
https://github.com/claunia/cuetools.net.git
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fe3cf97ef7
- Typos were found by codespell v1.17.0.dev0 (commit 44fea6d) - Command used: codespell -q 2 \ -L ba,bloc,blocs,doubleclick,dur,fille,frmat,numer,optin,passtime \ -L pres,strack,te,tim,tre,uint,whn \ --skip="*.de-DE.resx,./Bwg*,./Freedb,./MusicBrainz,./ProgressODoom" \ --skip="./ThirdParty"
336 lines
9.0 KiB
C#
336 lines
9.0 KiB
C#
using System;
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namespace CUETools.Codecs
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{
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unsafe public class BitReader
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{
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#region Static Methods
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public static int log2i(int v)
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{
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return log2i((uint)v);
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}
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public static readonly byte[] MultiplyDeBruijnBitPosition = new byte[32]
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{
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0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30,
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8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31
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};
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public static int log2i(ulong v)
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{
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v |= v >> 1; // first round down to one less than a power of 2
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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if (v >> 32 == 0)
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return MultiplyDeBruijnBitPosition[(uint)((uint)v * 0x07C4ACDDU) >> 27];
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return 32 + MultiplyDeBruijnBitPosition[(uint)((uint)(v >> 32) * 0x07C4ACDDU) >> 27];
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}
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public static int log2i(uint v)
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{
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v |= v >> 1; // first round down to one less than a power of 2
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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return MultiplyDeBruijnBitPosition[(uint)(v * 0x07C4ACDDU) >> 27];
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}
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public static readonly byte[] byte_to_unary_table = new byte[]
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{
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8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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#endregion
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private byte* buffer_m;
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private byte* bptr_m;
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private int buffer_len_m;
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private int have_bits_m;
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private ulong cache_m;
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private ushort crc16_m;
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public int Position
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{
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get { return (int)(bptr_m - buffer_m - (have_bits_m >> 3)); }
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}
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public byte* Buffer
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{
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get
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{
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return buffer_m;
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}
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}
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public BitReader()
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{
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buffer_m = null;
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bptr_m = null;
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buffer_len_m = 0;
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have_bits_m = 0;
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cache_m = 0;
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crc16_m = 0;
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}
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public BitReader(byte* _buffer, int _pos, int _len)
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{
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Reset(_buffer, _pos, _len);
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}
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public void Reset(byte* _buffer, int _pos, int _len)
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{
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buffer_m = _buffer;
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bptr_m = _buffer + _pos;
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buffer_len_m = _len;
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have_bits_m = 0;
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cache_m = 0;
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crc16_m = 0;
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fill();
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}
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public void fill()
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{
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while (have_bits_m < 56)
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{
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have_bits_m += 8;
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byte b = *(bptr_m++);
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cache_m |= (ulong)b << (64 - have_bits_m);
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crc16_m = (ushort)((crc16_m << 8) ^ Crc16.table[(crc16_m >> 8) ^ b]);
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}
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}
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/* skip any number of bits */
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public void skipbits(int bits)
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{
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while (bits > have_bits_m)
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{
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bits -= have_bits_m;
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cache_m = 0;
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have_bits_m = 0;
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fill();
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}
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cache_m <<= bits;
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have_bits_m -= bits;
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}
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public long read_long()
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{
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return ((long)readbits(32) << 32) | readbits(32);
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}
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public ulong read_ulong()
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{
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return ((ulong)readbits(32) << 32) | readbits(32);
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}
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public int read_int()
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{
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return (int)readbits(sizeof(int));
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}
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public uint read_uint()
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{
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return (uint)readbits(sizeof(uint));
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}
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public short read_short()
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{
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return (short)readbits(16);
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}
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public ushort read_ushort()
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{
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return (ushort)readbits(16);
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}
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/* supports reading 1 to 32 bits, in big endian format */
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public uint readbits(int bits)
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{
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fill();
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uint result = (uint)(cache_m >> 64 - bits);
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skipbits(bits);
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return result;
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}
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/* supports reading 1 to 64 bits, in big endian format */
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public ulong readbits64(int bits)
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{
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if (bits <= 56)
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return readbits(bits);
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return ((ulong)readbits(32) << bits - 32) | readbits(bits - 32);
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}
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/* reads a single bit */
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public uint readbit()
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{
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return readbits(1);
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}
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public uint read_unary()
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{
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fill();
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uint val = 0;
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ulong result = cache_m >> 56;
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while (result == 0)
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{
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val += 8;
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cache_m <<= 8;
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byte b = *(bptr_m++);
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cache_m |= (ulong)b << (64 - have_bits_m);
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crc16_m = (ushort)((crc16_m << 8) ^ Crc16.table[(crc16_m >> 8) ^ b]);
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result = cache_m >> 56;
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}
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val += byte_to_unary_table[result];
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skipbits((int)(val & 7) + 1);
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return val;
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}
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public void flush()
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{
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if ((have_bits_m & 7) > 0)
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{
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cache_m <<= have_bits_m & 7;
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have_bits_m -= have_bits_m & 7;
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}
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}
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public ushort get_crc16()
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{
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if (have_bits_m == 0)
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return crc16_m;
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ushort crc = 0;
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int n = have_bits_m >> 3;
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for (int i = 0; i < n; i++)
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crc = (ushort)((crc << 8) ^ Crc16.table[(crc >> 8) ^ (byte)(cache_m >> (56 - (i << 3)))]);
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return Crc16.Subtract(crc16_m, crc, n);
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}
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public int readbits_signed(int bits)
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{
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int val = (int)readbits(bits);
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val <<= (32 - bits);
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val >>= (32 - bits);
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return val;
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}
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public uint read_utf8()
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{
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uint x = readbits(8);
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uint v;
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int i;
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if (0 == (x & 0x80))
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{
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v = x;
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i = 0;
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}
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else if (0xC0 == (x & 0xE0)) /* 110xxxxx */
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{
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v = x & 0x1F;
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i = 1;
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}
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else if (0xE0 == (x & 0xF0)) /* 1110xxxx */
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{
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v = x & 0x0F;
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i = 2;
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}
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else if (0xF0 == (x & 0xF8)) /* 11110xxx */
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{
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v = x & 0x07;
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i = 3;
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}
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else if (0xF8 == (x & 0xFC)) /* 111110xx */
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{
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v = x & 0x03;
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i = 4;
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}
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else if (0xFC == (x & 0xFE)) /* 1111110x */
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{
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v = x & 0x01;
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i = 5;
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}
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else if (0xFE == x) /* 11111110 */
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{
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v = 0;
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i = 6;
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}
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else
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{
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throw new Exception("invalid utf8 encoding");
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}
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for (; i > 0; i--)
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{
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x = readbits(8);
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if (0x80 != (x & 0xC0)) /* 10xxxxxx */
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throw new Exception("invalid utf8 encoding");
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v <<= 6;
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v |= (x & 0x3F);
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}
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return v;
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}
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public void read_rice_block(int n, int k, int* r)
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{
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fill();
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fixed (byte* unary_table = byte_to_unary_table)
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fixed (ushort* t = Crc16.table)
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{
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uint mask = (1U << k) - 1;
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byte* bptr = bptr_m;
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int have_bits = have_bits_m;
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ulong cache = cache_m;
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ushort crc = crc16_m;
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for (int i = n; i > 0; i--)
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{
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uint bits;
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byte* orig_bptr = bptr;
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while ((bits = unary_table[cache >> 56]) == 8)
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{
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cache <<= 8;
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byte b = *(bptr++);
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cache |= (ulong)b << (64 - have_bits);
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crc = (ushort)((crc << 8) ^ t[(crc >> 8) ^ b]);
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}
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uint msbs = bits + ((uint)(bptr - orig_bptr) << 3);
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// assumes k <= 41 (have_bits < 41 + 7 + 1 + 8 == 57, so we don't loose bits here)
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while (have_bits < 56)
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{
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have_bits += 8;
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byte b = *(bptr++);
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cache |= (ulong)b << (64 - have_bits);
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crc = (ushort)((crc << 8) ^ t[(crc >> 8) ^ b]);
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}
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int btsk = k + (int)bits + 1;
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uint uval = (msbs << k) | (uint)((cache >> (64 - btsk)) & mask);
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cache <<= btsk;
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have_bits -= btsk;
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*(r++) = (int)(uval >> 1 ^ -(int)(uval & 1));
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}
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have_bits_m = have_bits;
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cache_m = cache;
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bptr_m = bptr;
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crc16_m = crc;
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}
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}
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}
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}
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