public long Decode(IBitStream stream, BitStreamCtx ctx)
{
long min = 0;
long check;
long u = 0;
int galloping = 1;
while (true) {
check = (1L << galloping) - 1L;
if (stream.Read (ctx)) {
min = check + 1L;
++galloping;
} else {
if (galloping == 1) {
if (stream.Read (ctx)) {
u++;
}
return u;
} else {
u += min;
min = 0L;
galloping = 1;
}
}
}
}
public override IEnumerable<int> ExtractFrom(int start, int count)
{
var ctx = new BitStreamCtx ();
int run_len = this.LocateAt (start - 1, ctx);
int v;
if (run_len == 0) {
v = this.GetNext (ctx);
if (v == 1) {
run_len = this.GetNext (ctx) - 1;
}
} else {
v = 1;
run_len--;
}
yield return v;
for (int i = 1; i < count; i++) {
if (run_len > 0) {
run_len--;
// v = 1;
} else {
v = this.GetNext (ctx);
if (v == 1) {
run_len = this.GetNext (ctx) - 1;
}
}
yield return v;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="natix.CompactDS.UnraveledSymbolGolynskiRL"/> class.
/// </summary>
public UnraveledSymbolGolynskiRL(GolynskiListRL2Seq _seqindex, int _symbol)
{
this.seqindex = _seqindex;
this.symbol = _symbol;
this.ctx = new BitStreamCtx ();
this.list = this.seqindex.GetPERM ().GetListRL2 ().Diffs;
}
public int Decode(IBitStream stream, BitStreamCtx ctx)
{
int min = 0;
int galloping = 1;
int check;
int u = 0;
while (true) {
check = (1 << galloping) - 1;
if (stream.Read (ctx)) {
min = check + 1;
++galloping;
} else {
if (galloping == 1) {
if (stream.Read(ctx)) {
u++;
}
return u;
} else {
u += min;
min = 0;
galloping = 1;
}
}
}
}
public int Decode(BitStream32 Buffer, BitStreamCtx ctx)
{
int u = Buffer.ReadZeros (ctx);
//int u = Buffer.ReadOnes ();
Buffer.Read (ctx);
return u;
}
public int ArrayGet(BitStream32 Buffer, int pos)
{
long p = pos;
p *= this.NumBits;
var ctx = new BitStreamCtx (p);
int number = (int)Buffer.Read (this.NumBits, ctx);
return number;
}
public int Decode(BitStream32 Buffer, BitStreamCtx ctx)
{
int numbits = unary.Decode (Buffer, ctx);
if (numbits == 0) {
return 1;
} else {
int number = (int) Buffer.Read (numbits, ctx);
return (1 << numbits) | number;
}
}
public int Decode(BitStream32 Buffer, BitStreamCtx ctx)
{
int len_code = gammacoder.Decode (Buffer, ctx);
len_code--;
if (len_code == 0) {
return 1;
} else {
int output = (int)Buffer.Read (len_code, ctx);
// Console.WriteLine ("Decode> count: {0}, output: {1}", count, output);
return (1 << len_code) + output;
}
}
public List<WTM_Symbol> Encode(int symbol, List<WTM_Symbol> output = null)
{
var coderstream = new BitStream32 ();
this.Coder.Encode (coderstream, symbol);
int numbits = (int)coderstream.CountBits;
var ctx = new BitStreamCtx (0);
if (output == null) {
output = new List<WTM_Symbol> ();
}
for (int i = 0; i < numbits; i+= this.bits_per_code) {
int code = (int)coderstream.Read (this.bits_per_code, ctx);
output.Add(new WTM_Symbol(code, (byte) Math.Min (this.bits_per_code, numbits - i)));
// Console.WriteLine("get-mini symbol: {0}, numbits: {1}, i: {2}, code: {3}", symbol, numbits, i, code);
}
return output;
}
public long Decode(BitStream32 Buffer, BitStreamCtx ctx)
{
int numbits = unary.Decode (Buffer, ctx);
if (numbits == 0) {
return 1L;
} else {
ulong number;
if (numbits <= 32) {
number = Buffer.Read (numbits, ctx);
} else {
number = Buffer.Read (32, ctx);
number |= Buffer.Read (numbits - 32, ctx) << 32;
}
number = (1UL << numbits) | number;
return (long)number;
}
}
public int Decode(IBitStream stream, BitStreamCtx ctx)
{
HuffmanInner node = this.Huffman.Root;
while (true) {
bool b = stream.Read (ctx);
HuffmanNode next;
if (b) {
next = node.Right;
} else {
next = node.Left;
}
var leaf = next as HuffmanLeaf;
if (leaf != null) {
return leaf.Symbol;
}
node = next as HuffmanInner;
}
}
public int Decode(IBitStream stream, int N, BitStreamCtx ctx)
{
int min = 0;
int max = N - 1;
int mid;
do {
mid = (min >> 1) + (max >> 1);
if (1 == (min & 1 & max)) {
mid++;
}
if (!stream.Read (ctx)) {
max = mid;
} else {
min = mid + 1;
}
} while (min < max);
return min;
}
public long Decode(BitStream32 stream, long N, BitStreamCtx ctx)
{
long min = 0;
long max = N - 1;
long mid;
do {
mid = (min >> 1) + (max >> 1);
if (1L == (min & 1L & max)) {
mid++;
}
if (!stream.Read (ctx)) {
max = mid;
} else {
min = mid + 1L;
}
} while (min < max);
return min;
}
public int Decode(BitStream32 Buffer, BitStreamCtx ctx)
{
// int numbits = unary.Decode (Buffer, ctx);
// the idea is to replace unary coder by explicit inline code such that (hopefully)
// both "code" and "numbits" are stored into registers
var M = (int)Math.Min (32, Buffer.CountBits - ctx.Offset);
var code = (uint)Buffer.Read (M, ctx);
if ((code & 0x1) == 1) {
ctx.Offset -= M - 1;
return 1;
}
if (code == 0) {
throw new ArgumentException ("Integers larger than 31 bits are not supported by EliasGamma32");
}
int numbits = 0;
// Console.WriteLine ("xxxxxxxxxxxxxxxxxxxxxxxxxxxxx ");
// Console.WriteLine ("xxxxx start-read> offset: {0},\t numbits: {1},\t code: {2}", ctx.Offset, numbits, BitAccess.ToAsciiString (code));
while ((code & 0xFF) == 0) {
numbits += 8;
code >>= 8;
}
if ((code & 0xF) == 0) {
numbits += 4;
code >>= 4;
}
while ((code & 0x1) == 0) {
numbits += 1;
code >>= 1;
}
code >>= 1;
// Console.WriteLine ("xxxxx unary-read> offset: {0},\t numbits: {1},\t code: {2}", ctx.Offset, numbits, BitAccess.ToAsciiString (code));
if (numbits >= 16) {
int in_cache = M - 1 - numbits;
code |= ((uint)Buffer.Read (numbits - in_cache, ctx)) << in_cache;
} else {
ctx.Offset -= M - ((numbits << 1) + 1);
code &= (1u << numbits) - 1;
}
// Console.WriteLine ("xxxxx final-read0> offset: {0},\t numbits: {1},\t code: {3},\t number: {2}", ctx.Offset, numbits, code, BitAccess.ToAsciiString (code));
code |= (1u << numbits);
// Console.WriteLine ("xxxxx final-read1> offset: {0},\t numbits: {1},\t code: {3},\t number: {2}", ctx.Offset, numbits, code, BitAccess.ToAsciiString (code));
return (int)code;
}
public int Decode(BitStream32 stream, BitStreamCtx ctx)
{
int min = 0;
int galloping = 1;
int check;
while (true) {
check = (1 << galloping) - 1;
if (stream.Read (ctx)) {
min = check + 1;
++galloping;
} else {
if (min == 0) {
return this.SecondCoding.Decode(stream, 2, ctx);
} else {
return min + this.SecondCoding.Decode(stream, min, ctx);
}
}
}
}
public long Decode(IBitStream stream, BitStreamCtx ctx)
{
long min = 0;
long check;
int galloping = 1;
while (true) {
check = (1L << galloping) - 1L;
if (stream.Read (ctx)) {
min = check + 1L;
++galloping;
} else {
if (min == 0L) {
return this.SecondCoding.Decode (stream, 2, ctx);
} else {
return min + this.SecondCoding.Decode (stream, min, ctx);
}
}
}
}
public long Decode(IBitStream Buffer, BitStreamCtx ctx)
{
int len_code = gammacoder.Decode (Buffer, ctx);
--len_code;
if (len_code == 0) {
return 1L;
} else {
ulong number;
if (len_code <= 32) {
number = Buffer.Read (len_code, ctx);
} else {
number = Buffer.Read (32, ctx);
number |= Buffer.Read (len_code - 32, ctx) << 32;
}
number = (1UL << len_code) | number;
return (long)number;
}
}
public ContextListI()
{
this.ctx = new BitStreamCtx();
this.Reset();
}
public long Decode(BitStream32 stream, BitStreamCtx ctx)
{
return this.Decode (stream, this.MaxValue, ctx);
}
public int GetNext(BitStreamCtx ctx, ref int run_len)
{
if (run_len > 0) {
run_len--;
return 1;
}
var p = this.GetNext (ctx);
if (p == 1) {
run_len = this.GetNext (ctx) - 1;
}
return p;
}
public void PrintDebug()
{
var ctx = new BitStreamCtx ();
ctx.Seek (0);
int i = 0;
while (ctx.Offset < this.Stream.CountBits) {
var c = this.Coder.Decode (this.Stream, ctx);
Console.WriteLine ("=> i: {0}, c: {1}", i, c);
}
}
public int Sum(int start, int count, BitStreamCtx ctx, ref int run_len)
{
run_len = this.LocateAt (start - 1, ctx);
int sum = this.GetNext (ctx, ref run_len);
count--;
if (count > 0 && run_len > 0) {
sum += run_len;
count -= run_len;
run_len = 0;
}
if (count < 0) {
sum += count;
run_len = -count;
return sum;
}
while (count > 0) {
int v = this.GetNext (ctx, ref run_len);
sum += v;
count--;
if (count > 0 && v == 1) {
count -= run_len;
sum += run_len;
if (count < 0) {
sum += count;
run_len = -count;
} else {
run_len = 0;
}
}
}
return sum;
}
protected override int ReadNext(BitStreamCtx ctx)
{
if (run_len > 0) {
run_len--;
return 1;
}
int d = base.ReadNext (ctx);
if (d == 1) {
run_len = base.ReadNext (ctx) - 1;
}
return d;
}
public int SelectRL(int symbol, int abs_rank, BitStreamCtx ctx, ref int run_len)
{
if (abs_rank < 1) {
return -1;
}
symbol++;
var pos = this.LENS.Select1 (symbol);
var rank0 = pos + 1 - symbol;
return this.PERM.GetListRL2 ().GetItem (abs_rank + rank0 - 1, ctx, ref run_len);
}
public int Decode(BitStream32 Buffer, BitStreamCtx ctx)
{
int skip = this.SkipCoder.Decode (Buffer, ctx);
int output = (int)Buffer.Read (this.Power, ctx);
return (skip << this.Power) | output;
}
/// <summary>
/// Locates ctx at index. Returns the remaining run_len value if any
/// </summary>
/// <returns>
protected int LocateAt(int index, BitStreamCtx ctx)
{
if (index == -1) {
ctx.Seek (0);
return 0;
}
int offset_index = index / this.BlockSize;
if (offset_index == 0) {
ctx.Seek (0);
} else {
ctx.Seek (this.Offsets [offset_index - 1]);
}
int left = 1 + index - offset_index * this.BlockSize;
int run_len = 0;
for (int i = 0; i < left;) {
if (run_len > 0) {
// run_len--;
i += run_len;
run_len = 0;
if (left < i) {
run_len = i - left;
i = left;
}
} else {
var res = this.GetNext (ctx);
if (res == 1) {
run_len = this.GetNext (ctx) - 1;
}
i++;
}
}
// Console.WriteLine ("** index: {0}, run_len: {1}, left: {2}", index, run_len, left);
return run_len;
}
/// <summary>
/// Finds the sum or the insertion position of sum.
/// </summary>
/// <returns>
public int FindSum(int start, int sum, BitStreamCtx ctx, ref int run_len)
{
int rank = 0;
run_len = this.LocateAt (start - 1, ctx);
int current_sum = this.GetNext (ctx, ref run_len);
if (current_sum > sum) {
return rank;
}
current_sum += run_len;
rank += run_len;
run_len = 0;
if (current_sum > sum) {
run_len = current_sum - sum;
rank -= run_len;
return rank;
}
while (current_sum < sum) {
int next_diff = this.GetNext (ctx, ref run_len);
current_sum += next_diff;
if (current_sum > sum) {
break;
}
rank++;
if (current_sum == sum) {
break;
}
current_sum += run_len;
rank += run_len;
run_len = 0;
if (current_sum > sum) {
run_len = current_sum - sum;
rank -= run_len;
break;
}
}
return rank;
}
public int Decode(IBitStream Buffer, BitStreamCtx ctx)
{
return this.Coder.Decode (Buffer, ctx) - this.Smaller;
}
public void Build(IBitStream B, short blockSize)
{
this.N = (int)B.CountBits;
this.BlockSize = (short)blockSize;
this.InitClasses();
this.Offsets = new BitStream32 ();
IList<int> _L = new ListIFS (15, B);
IList<int> L;
if ((B.CountBits % 15) == 0) {
L = _L;
} else {
int D = _L.Count;
int C = 15 * D;
var ctx = new BitStreamCtx(0);
ctx.Seek(C);
int last_block = (int)B.Read(((int)B.CountBits) - C, ctx);
L = new ListGen<int>(delegate(int a) {
if (a == D) {
return last_block;
} else {
return _L[a];
}
}, D+1);
}
this.AbsRank = new int[(int)Math.Ceiling(((float)L.Count) / this.BlockSize)];
this.AbsOffset = new int[ this.AbsRank.Count ];
int I = 0;
int acc = 0;
for (int i = 0; i < L.Count; i++) {
var u = (short)L[i];
var klass = GetClass(u);
this.EncodeClass(klass);
if (i % this.BlockSize == 0) {
this.AbsRank[I] = acc;
this.AbsOffset[I] = (int)this.Offsets.CountBits;
I++;
}
var numbits = NumBits[klass];
if (numbits > 0) {
int offset = this.GetOffset (u, klass);
this.Offsets.Write (offset, numbits);
}
acc += klass;
}
}
public int Decode(IBitStream stream, BitStreamCtx ctx)
{
return this.Decode (stream, this.Size, ctx);
}
