1*0957b409SSimon J. Gerraty /* 2*0957b409SSimon J. Gerraty * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org> 3*0957b409SSimon J. Gerraty * 4*0957b409SSimon J. Gerraty * Permission is hereby granted, free of charge, to any person obtaining 5*0957b409SSimon J. Gerraty * a copy of this software and associated documentation files (the 6*0957b409SSimon J. Gerraty * "Software"), to deal in the Software without restriction, including 7*0957b409SSimon J. Gerraty * without limitation the rights to use, copy, modify, merge, publish, 8*0957b409SSimon J. Gerraty * distribute, sublicense, and/or sell copies of the Software, and to 9*0957b409SSimon J. Gerraty * permit persons to whom the Software is furnished to do so, subject to 10*0957b409SSimon J. Gerraty * the following conditions: 11*0957b409SSimon J. Gerraty * 12*0957b409SSimon J. Gerraty * The above copyright notice and this permission notice shall be 13*0957b409SSimon J. Gerraty * included in all copies or substantial portions of the Software. 14*0957b409SSimon J. Gerraty * 15*0957b409SSimon J. Gerraty * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16*0957b409SSimon J. Gerraty * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17*0957b409SSimon J. Gerraty * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18*0957b409SSimon J. Gerraty * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 19*0957b409SSimon J. Gerraty * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 20*0957b409SSimon J. Gerraty * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 21*0957b409SSimon J. Gerraty * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22*0957b409SSimon J. Gerraty * SOFTWARE. 23*0957b409SSimon J. Gerraty */ 24*0957b409SSimon J. Gerraty 25*0957b409SSimon J. Gerraty using System; 26*0957b409SSimon J. Gerraty using System.Collections.Generic; 27*0957b409SSimon J. Gerraty using System.Text; 28*0957b409SSimon J. Gerraty 29*0957b409SSimon J. Gerraty class ConstData { 30*0957b409SSimon J. Gerraty 31*0957b409SSimon J. Gerraty internal long ID { get; private set; } 32*0957b409SSimon J. Gerraty internal int Address { get; set; } 33*0957b409SSimon J. Gerraty internal int Length { 34*0957b409SSimon J. Gerraty get { 35*0957b409SSimon J. Gerraty return len; 36*0957b409SSimon J. Gerraty } 37*0957b409SSimon J. Gerraty } 38*0957b409SSimon J. Gerraty 39*0957b409SSimon J. Gerraty byte[] buf; 40*0957b409SSimon J. Gerraty int len; 41*0957b409SSimon J. Gerraty ConstData(T0Comp ctx)42*0957b409SSimon J. Gerraty internal ConstData(T0Comp ctx) 43*0957b409SSimon J. Gerraty { 44*0957b409SSimon J. Gerraty ID = ctx.NextBlobID(); 45*0957b409SSimon J. Gerraty buf = new byte[4]; 46*0957b409SSimon J. Gerraty len = 0; 47*0957b409SSimon J. Gerraty } 48*0957b409SSimon J. Gerraty Expand(int elen)49*0957b409SSimon J. Gerraty void Expand(int elen) 50*0957b409SSimon J. Gerraty { 51*0957b409SSimon J. Gerraty int tlen = len + elen; 52*0957b409SSimon J. Gerraty if (tlen > buf.Length) { 53*0957b409SSimon J. Gerraty int nlen = Math.Max(buf.Length << 1, tlen); 54*0957b409SSimon J. Gerraty byte[] nbuf = new byte[nlen]; 55*0957b409SSimon J. Gerraty Array.Copy(buf, 0, nbuf, 0, len); 56*0957b409SSimon J. Gerraty buf = nbuf; 57*0957b409SSimon J. Gerraty } 58*0957b409SSimon J. Gerraty } 59*0957b409SSimon J. Gerraty Add8(byte b)60*0957b409SSimon J. Gerraty internal void Add8(byte b) 61*0957b409SSimon J. Gerraty { 62*0957b409SSimon J. Gerraty Expand(1); 63*0957b409SSimon J. Gerraty buf[len ++] = b; 64*0957b409SSimon J. Gerraty } 65*0957b409SSimon J. Gerraty Add16(int x)66*0957b409SSimon J. Gerraty internal void Add16(int x) 67*0957b409SSimon J. Gerraty { 68*0957b409SSimon J. Gerraty Expand(2); 69*0957b409SSimon J. Gerraty buf[len ++] = (byte)(x >> 8); 70*0957b409SSimon J. Gerraty buf[len ++] = (byte)x; 71*0957b409SSimon J. Gerraty } 72*0957b409SSimon J. Gerraty Add24(int x)73*0957b409SSimon J. Gerraty internal void Add24(int x) 74*0957b409SSimon J. Gerraty { 75*0957b409SSimon J. Gerraty Expand(3); 76*0957b409SSimon J. Gerraty buf[len ++] = (byte)(x >> 16); 77*0957b409SSimon J. Gerraty buf[len ++] = (byte)(x >> 8); 78*0957b409SSimon J. Gerraty buf[len ++] = (byte)x; 79*0957b409SSimon J. Gerraty } 80*0957b409SSimon J. Gerraty Add32(int x)81*0957b409SSimon J. Gerraty internal void Add32(int x) 82*0957b409SSimon J. Gerraty { 83*0957b409SSimon J. Gerraty Expand(4); 84*0957b409SSimon J. Gerraty buf[len ++] = (byte)(x >> 24); 85*0957b409SSimon J. Gerraty buf[len ++] = (byte)(x >> 16); 86*0957b409SSimon J. Gerraty buf[len ++] = (byte)(x >> 8); 87*0957b409SSimon J. Gerraty buf[len ++] = (byte)x; 88*0957b409SSimon J. Gerraty } 89*0957b409SSimon J. Gerraty AddString(string s)90*0957b409SSimon J. Gerraty internal void AddString(string s) 91*0957b409SSimon J. Gerraty { 92*0957b409SSimon J. Gerraty byte[] sd = Encoding.UTF8.GetBytes(s); 93*0957b409SSimon J. Gerraty Expand(sd.Length + 1); 94*0957b409SSimon J. Gerraty Array.Copy(sd, 0, buf, len, sd.Length); 95*0957b409SSimon J. Gerraty buf[len + sd.Length] = 0; 96*0957b409SSimon J. Gerraty len += sd.Length + 1; 97*0957b409SSimon J. Gerraty } 98*0957b409SSimon J. Gerraty CheckIndex(int off, int dlen)99*0957b409SSimon J. Gerraty void CheckIndex(int off, int dlen) 100*0957b409SSimon J. Gerraty { 101*0957b409SSimon J. Gerraty if (off < 0 || off > (len - dlen)) { 102*0957b409SSimon J. Gerraty throw new IndexOutOfRangeException(); 103*0957b409SSimon J. Gerraty } 104*0957b409SSimon J. Gerraty } 105*0957b409SSimon J. Gerraty Set8(int off, byte v)106*0957b409SSimon J. Gerraty internal void Set8(int off, byte v) 107*0957b409SSimon J. Gerraty { 108*0957b409SSimon J. Gerraty CheckIndex(off, 1); 109*0957b409SSimon J. Gerraty buf[off] = v; 110*0957b409SSimon J. Gerraty } 111*0957b409SSimon J. Gerraty Read8(int off)112*0957b409SSimon J. Gerraty internal byte Read8(int off) 113*0957b409SSimon J. Gerraty { 114*0957b409SSimon J. Gerraty CheckIndex(off, 1); 115*0957b409SSimon J. Gerraty return buf[off]; 116*0957b409SSimon J. Gerraty } 117*0957b409SSimon J. Gerraty Read16(int off)118*0957b409SSimon J. Gerraty internal int Read16(int off) 119*0957b409SSimon J. Gerraty { 120*0957b409SSimon J. Gerraty CheckIndex(off, 2); 121*0957b409SSimon J. Gerraty return (buf[off] << 8) | buf[off + 1]; 122*0957b409SSimon J. Gerraty } 123*0957b409SSimon J. Gerraty Read24(int off)124*0957b409SSimon J. Gerraty internal int Read24(int off) 125*0957b409SSimon J. Gerraty { 126*0957b409SSimon J. Gerraty CheckIndex(off, 3); 127*0957b409SSimon J. Gerraty return (buf[off] << 16) | (buf[off + 1] << 8) | buf[off + 2]; 128*0957b409SSimon J. Gerraty } 129*0957b409SSimon J. Gerraty Read32(int off)130*0957b409SSimon J. Gerraty internal int Read32(int off) 131*0957b409SSimon J. Gerraty { 132*0957b409SSimon J. Gerraty CheckIndex(off, 4); 133*0957b409SSimon J. Gerraty return (buf[off] << 24) | (buf[off + 1] << 16) 134*0957b409SSimon J. Gerraty | (buf[off + 2] << 8) | buf[off + 3]; 135*0957b409SSimon J. Gerraty } 136*0957b409SSimon J. Gerraty ToString(int off)137*0957b409SSimon J. Gerraty internal string ToString(int off) 138*0957b409SSimon J. Gerraty { 139*0957b409SSimon J. Gerraty StringBuilder sb = new StringBuilder(); 140*0957b409SSimon J. Gerraty for (;;) { 141*0957b409SSimon J. Gerraty int x = DecodeUTF8(ref off); 142*0957b409SSimon J. Gerraty if (x == 0) { 143*0957b409SSimon J. Gerraty return sb.ToString(); 144*0957b409SSimon J. Gerraty } 145*0957b409SSimon J. Gerraty if (x < 0x10000) { 146*0957b409SSimon J. Gerraty sb.Append((char)x); 147*0957b409SSimon J. Gerraty } else { 148*0957b409SSimon J. Gerraty x -= 0x10000; 149*0957b409SSimon J. Gerraty sb.Append((char)(0xD800 + (x >> 10))); 150*0957b409SSimon J. Gerraty sb.Append((char)(0xDC00 + (x & 0x3FF))); 151*0957b409SSimon J. Gerraty } 152*0957b409SSimon J. Gerraty } 153*0957b409SSimon J. Gerraty } 154*0957b409SSimon J. Gerraty DecodeUTF8(ref int off)155*0957b409SSimon J. Gerraty int DecodeUTF8(ref int off) 156*0957b409SSimon J. Gerraty { 157*0957b409SSimon J. Gerraty if (off >= len) { 158*0957b409SSimon J. Gerraty throw new IndexOutOfRangeException(); 159*0957b409SSimon J. Gerraty } 160*0957b409SSimon J. Gerraty int x = buf[off ++]; 161*0957b409SSimon J. Gerraty if (x < 0xC0 || x > 0xF7) { 162*0957b409SSimon J. Gerraty return x; 163*0957b409SSimon J. Gerraty } 164*0957b409SSimon J. Gerraty int elen, acc; 165*0957b409SSimon J. Gerraty if (x >= 0xF0) { 166*0957b409SSimon J. Gerraty elen = 3; 167*0957b409SSimon J. Gerraty acc = x & 0x07; 168*0957b409SSimon J. Gerraty } else if (x >= 0xE0) { 169*0957b409SSimon J. Gerraty elen = 2; 170*0957b409SSimon J. Gerraty acc = x & 0x0F; 171*0957b409SSimon J. Gerraty } else { 172*0957b409SSimon J. Gerraty elen = 1; 173*0957b409SSimon J. Gerraty acc = x & 0x1F; 174*0957b409SSimon J. Gerraty } 175*0957b409SSimon J. Gerraty if (off + elen > len) { 176*0957b409SSimon J. Gerraty return x; 177*0957b409SSimon J. Gerraty } 178*0957b409SSimon J. Gerraty for (int i = 0; i < elen; i ++) { 179*0957b409SSimon J. Gerraty int y = buf[off + i]; 180*0957b409SSimon J. Gerraty if (y < 0x80 || y >= 0xC0) { 181*0957b409SSimon J. Gerraty return x; 182*0957b409SSimon J. Gerraty } 183*0957b409SSimon J. Gerraty acc = (acc << 6) + (y & 0x3F); 184*0957b409SSimon J. Gerraty } 185*0957b409SSimon J. Gerraty if (acc > 0x10FFFF) { 186*0957b409SSimon J. Gerraty return x; 187*0957b409SSimon J. Gerraty } 188*0957b409SSimon J. Gerraty off += elen; 189*0957b409SSimon J. Gerraty return acc; 190*0957b409SSimon J. Gerraty } 191*0957b409SSimon J. Gerraty Encode(BlobWriter bw)192*0957b409SSimon J. Gerraty internal void Encode(BlobWriter bw) 193*0957b409SSimon J. Gerraty { 194*0957b409SSimon J. Gerraty for (int i = 0; i < len; i ++) { 195*0957b409SSimon J. Gerraty bw.Append(buf[i]); 196*0957b409SSimon J. Gerraty } 197*0957b409SSimon J. Gerraty } 198*0957b409SSimon J. Gerraty } 199