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Gvwie updated

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ahmed
2026-04-09 16:36:05 +03:00
parent 15479288cc
commit ae524f577a
9 changed files with 575 additions and 509 deletions
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Libraries/Esiur/Data/Gvwie/GroupInt64Codec.cs
+58 -196
View File
@@ -1,141 +1,4 @@
//using System;
//using System.Collections.Generic;
//using System.Linq;
//using System.Text;
//using System.Threading.Tasks;
//using System;
//using System.Collections.Generic;
//using System.Runtime.CompilerServices;
//namespace Esiur.Data.Gvwie;
//public static class GroupInt64Codec
//{
// // ----------------- Encoder -----------------
// public static byte[] Encode(IList<long> values)
// {
// var dst = new List<byte>(values.Count * 2);
// int i = 0;
// while (i < values.Count)
// {
// ulong zz = ZigZag64(values[i]);
// // Fast path: 1 byte when ZigZag fits in 7 bits
// if (zz <= 0x7Ful)
// {
// dst.Add((byte)zz); // MSB = 0 implicitly
// i++;
// continue;
// }
// // Group path: up to 16 items sharing a common width (1..8 bytes)
// int start = i;
// int count = 1;
// int width = WidthFromZigZag(zz);
// while (count < 16 && (i + count) < values.Count)
// {
// ulong z2 = ZigZag64(values[i + count]);
// int w2 = WidthFromZigZag(z2);
// width = Math.Max(width, w2); // widen as needed
// count++;
// }
// // Header: 1 | (count-1)[4 bits] | (width-1)[3 bits]
// byte header = 0x80;
// header |= (byte)(((count - 1) & 0x0F) << 3);
// header |= (byte)((width - 1) & 0x07);
// dst.Add(header);
// // Payload: 'count' ZigZag values, LE, 'width' bytes each
// for (int k = 0; k < count; k++)
// {
// ulong z = ZigZag64(values[start + k]);
// WriteLE(dst, z, width);
// }
// i += count;
// }
// return dst.ToArray();
// }
// // ----------------- Decoder -----------------
// public static long[] Decode(ReadOnlySpan<byte> src)
// {
// var result = new List<long>();
// int pos = 0;
// while (pos < src.Length)
// {
// byte h = src[pos++];
// if ((h & 0x80) == 0)
// {
// // Fast path: 7-bit ZigZag
// ulong zz7 = (ulong)(h & 0x7F);
// result.Add(UnZigZag64(zz7));
// continue;
// }
// int count = ((h >> 3) & 0x0F) + 1; // 1..16
// int width = (h & 0x07) + 1; // 1..8
// for (int j = 0; j < count; j++)
// {
// ulong raw = ReadLE(src, ref pos, width);
// long val = UnZigZag64(raw);
// result.Add(val);
// }
// }
// return result.ToArray();
// }
// // ----------------- Helpers -----------------
// [MethodImpl(MethodImplOptions.AggressiveInlining)]
// private static ulong ZigZag64(long v) => (ulong)((v << 1) ^ (v >> 63));
// [MethodImpl(MethodImplOptions.AggressiveInlining)]
// private static long UnZigZag64(ulong u) => (long)((u >> 1) ^ (ulong)-(long)(u & 1));
// [MethodImpl(MethodImplOptions.AggressiveInlining)]
// private static int WidthFromZigZag(ulong z)
// {
// if (z <= 0xFFUL) return 1;
// if (z <= 0xFFFFUL) return 2;
// if (z <= 0xFFFFFFUL) return 3;
// if (z <= 0xFFFFFFFFUL) return 4;
// if (z <= 0xFFFFFFFFFFUL) return 5;
// if (z <= 0xFFFFFFFFFFFFUL) return 6;
// if (z <= 0xFFFFFFFFFFFFFFUL) return 7;
// return 8;
// }
// [MethodImpl(MethodImplOptions.AggressiveInlining)]
// private static void WriteLE(List<byte> dst, ulong value, int width)
// {
// for (int i = 0; i < width; i++)
// dst.Add((byte)((value >> (8 * i)) & 0xFF));
// }
// [MethodImpl(MethodImplOptions.AggressiveInlining)]
// private static ulong ReadLE(ReadOnlySpan<byte> src, ref int pos, int width)
// {
// if ((uint)(pos + width) > (uint)src.Length)
// throw new ArgumentException("Buffer underflow while reading group payload.");
// ulong v = 0;
// for (int i = 0; i < width; i++)
// v |= (ulong)src[pos++] << (8 * i);
// return v;
// }
//}
using System;
using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
@@ -143,16 +6,6 @@ namespace Esiur.Data.Gvwie;
public static class GroupInt64Codec
{
// Header layout for grouped values:
// 1 | cccc | www
//
// MSB = 1 => grouped form
// cccc = 0..14 => short count = cccc + 1 (1..15)
// cccc = 15 => extended count, followed by varint(count - 16)
// www = 0..7 => width = www + 1 (1..8)
//
// MSB = 0 => literal fast path for ZigZag values in 7 bits
// ----------------- Encoder -----------------
public static byte[] Encode(IList<long> values, bool aligned = false)
{
@@ -191,10 +44,11 @@ public static class GroupInt64Codec
count++;
}
if (count <= 15)
if (count <= 12)
{
// Short group:
// Header: 1 | (count-1)[4 bits] | (width-1)[3 bits]
// count field 0000..1011 => count 1..12
byte header = 0x80;
header |= (byte)(((count - 1) & 0x0F) << 3);
header |= (byte)((width - 1) & 0x07);
@@ -203,13 +57,33 @@ public static class GroupInt64Codec
else
{
// Extended group:
// Header: 1 | 1111 | (width-1)[3 bits]
// Followed by varint(count - 16)
// Header: 1 | g[4 bits] | (width-1)[3 bits]
//
// g = 1100 => LoL = 1 byte
// g = 1101 => LoL = 2 bytes
// g = 1110 => LoL = 3 bytes
// g = 1111 => LoL = 4 bytes
//
// LoL stores (count - 13) in little-endian form.
uint extra = checked((uint)(count - 13));
int lol = LengthOfLength(extra); // 1..4
byte groupBits = lol switch
{
1 => 0b1100,
2 => 0b1101,
3 => 0b1110,
4 => 0b1111,
_ => throw new InvalidOperationException("Invalid LoL.")
};
byte header = 0x80;
header |= 0x78; // count bits = 1111
header |= (byte)(groupBits << 3);
header |= (byte)((width - 1) & 0x07);
dst.Add(header);
WriteVarUInt32(dst, checked((uint)(count - 16)));
WriteLE(dst, extra, lol);
}
// Payload: 'count' zigzag values, LE, 'width' bytes each
@@ -244,22 +118,29 @@ public static class GroupInt64Codec
int width = (h & 0x07) + 1;
int count;
if (countField == 15)
if (countField <= 11)
{
// Extended group length
uint extra = ReadVarUInt32(src, ref pos);
count = checked(16 + (int)extra);
// Short group: 0..11 => count 1..12
count = countField + 1;
}
else
{
count = countField + 1;
// Extended group:
// 12 => LoL=1
// 13 => LoL=2
// 14 => LoL=3
// 15 => LoL=4
int lol = countField - 11;
uint extra = checked((uint)ReadLE(src, ref pos, lol));
count = checked(13 + (int)extra);
}
for (int j = 0; j < count; j++)
{
ulong raw = ReadLE(src, ref pos, width);
long val = UnZigZag64(raw);
result.Add(val);
result.Add(UnZigZag64(raw));
}
}
@@ -285,7 +166,15 @@ public static class GroupInt64Codec
if (z <= 0xFFFFFFFFFFFFul) return aligned ? 8 : 6;
if (z <= 0xFFFFFFFFFFFFFFul) return aligned ? 8 : 7;
return 8;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static int LengthOfLength(uint value)
{
if (value <= 0xFFu) return 1;
if (value <= 0xFFFFu) return 2;
if (value <= 0xFFFFFFu) return 3;
return 4;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -295,50 +184,23 @@ public static class GroupInt64Codec
dst.Add((byte)((value >> (8 * i)) & 0xFF));
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static void WriteLE(List<byte> dst, uint value, int width)
{
for (int i = 0; i < width; i++)
dst.Add((byte)((value >> (8 * i)) & 0xFF));
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static ulong ReadLE(ReadOnlySpan<byte> src, ref int pos, int width)
{
if ((uint)(pos + width) > (uint)src.Length)
throw new ArgumentException("Buffer underflow while reading group payload.");
throw new ArgumentException("Buffer underflow while reading payload.");
ulong v = 0;
for (int i = 0; i < width; i++)
v |= (ulong)src[pos++] << (8 * i);
return v;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static void WriteVarUInt32(List<byte> dst, uint value)
{
while (value >= 0x80)
{
dst.Add((byte)((value & 0x7F) | 0x80));
value >>= 7;
}
dst.Add((byte)value);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static uint ReadVarUInt32(ReadOnlySpan<byte> src, ref int pos)
{
uint result = 0;
int shift = 0;
while (true)
{
if (pos >= src.Length)
throw new ArgumentException("Buffer underflow while reading varint.");
byte b = src[pos++];
result |= (uint)(b & 0x7F) << shift;
if ((b & 0x80) == 0)
return result;
shift += 7;
if (shift >= 35)
throw new ArgumentException("Varint is too long for UInt32.");
}
}
}