//! \file Utility.cs //! \date Sat Jul 05 02:47:33 2014 //! \brief utility class for GameRes assembly. // namespace GameRes.Utility { public static class Binary { public static uint BigEndian (uint u) { return (u & 0xff) << 24 | (u & 0xff00) << 8 | (u & 0xff0000) >> 8 | (u & 0xff000000) >> 24; } public static int BigEndian (int i) { return (int)BigEndian ((uint)i); } public static ushort BigEndian (ushort u) { return (ushort)((u & 0xff) << 8 | (u & 0xff00) >> 8); } public static short BigEndian (short i) { return (short)BigEndian ((ushort)i); } public static ulong BigEndian (ulong u) { return (ulong)BigEndian((uint)(u & 0xffffffff)) << 32 | (ulong)BigEndian((uint)(u >> 32)); } public static long BigEndian (long i) { return (long)BigEndian ((ulong)i); } public static bool AsciiEqual (byte[] name1, string name2) { return AsciiEqual (name1, 0, name2); } public static bool AsciiEqual (byte[] name1, int offset, string name2) { if (name1.Length-offset < name2.Length) return false; for (int i = 0; i < name2.Length; ++i) if ((char)name1[offset+i] != name2[i]) return false; return true; } } public static class LittleEndian { public static ushort ToUInt16 (byte[] value, int index) { return (ushort)(value[index] | value[index+1] << 8); } public static short ToInt16 (byte[] value, int index) { return (short)(value[index] | value[index+1] << 8); } public static uint ToUInt32 (byte[] value, int index) { return (uint)(value[index] | value[index+1] << 8 | value[index+2] << 16 | value[index+3] << 24); } public static int ToInt32 (byte[] value, int index) { return (int)ToUInt32 (value, index); } } public sealed class Crc32 { /* Table of CRCs of all 8-bit messages. */ private static readonly uint[] crc_table = InitializeTable(); /* Make the table for a fast CRC. */ private static uint[] InitializeTable () { uint[] table = new uint[256]; for (uint n = 0; n < 256; n++) { uint c = n; for (int k = 0; k < 8; k++) { if (0 != (c & 1)) c = 0xedb88320 ^ (c >> 1); else c = c >> 1; } table[n] = c; } return table; } /* Update a running CRC with the bytes buf[0..len-1]--the CRC should be initialized to all 1's, and the transmitted value is the 1's complement of the final running CRC (see the crc() routine below)). */ static uint UpdateCrc (uint crc, byte[] buf, int pos, int len) { uint c = crc; for (int n = 0; n < len; n++) c = crc_table[(c ^ buf[pos+n]) & 0xff] ^ (c >> 8); return c; } /* Return the CRC of the bytes buf[0..len-1]. */ public static uint Compute (byte[] buf, int pos, int len) { return UpdateCrc (0xffffffff, buf, pos, len) ^ 0xffffffff; } private uint m_crc = 0xffffffff; public uint Value { get { return m_crc^0xffffffff; } } public void Update (byte[] buf, int pos, int len) { m_crc = UpdateCrc (m_crc, buf, pos, len); } } public sealed class Adler32 { const uint BASE = 65521; /* largest prime smaller than 65536 */ const int NMAX = 5552; public static uint Compute (byte[] buf, int pos, int len) { return Update (1, buf, pos, len); } private static uint Update (uint adler, byte[] buf, int pos, int len) { /* split Adler-32 into component sums */ uint sum2 = (adler >> 16) & 0xffff; adler &= 0xffff; /* in case user likes doing a byte at a time, keep it fast */ if (1 == len) { adler += buf[pos]; if (adler >= BASE) adler -= BASE; sum2 += adler; if (sum2 >= BASE) sum2 -= BASE; return adler | (sum2 << 16); } /* in case short lengths are provided, keep it somewhat fast */ if (len < 16) { while (0 != len--) { adler += buf[pos++]; sum2 += adler; } if (adler >= BASE) adler -= BASE; sum2 %= BASE; /* only added so many BASE's */ return adler | (sum2 << 16); } /* do length NMAX blocks -- requires just one modulo operation */ while (len >= NMAX) { len -= NMAX; int n = NMAX / 16; /* NMAX is divisible by 16 */ do { /* 16 sums unrolled */ adler += buf[pos]; sum2 += adler; adler += buf[pos+1]; sum2 += adler; adler += buf[pos+2]; sum2 += adler; adler += buf[pos+3]; sum2 += adler; adler += buf[pos+4]; sum2 += adler; adler += buf[pos+5]; sum2 += adler; adler += buf[pos+6]; sum2 += adler; adler += buf[pos+7]; sum2 += adler; adler += buf[pos+8]; sum2 += adler; adler += buf[pos+9]; sum2 += adler; adler += buf[pos+10]; sum2 += adler; adler += buf[pos+11]; sum2 += adler; adler += buf[pos+12]; sum2 += adler; adler += buf[pos+13]; sum2 += adler; adler += buf[pos+14]; sum2 += adler; adler += buf[pos+15]; sum2 += adler; pos += 16; } while (0 != --n); adler %= BASE; sum2 %= BASE; } /* do remaining bytes (less than NMAX, still just one modulo) */ if (0 != len) { /* avoid modulos if none remaining */ while (len >= 16) { len -= 16; adler += buf[pos]; sum2 += adler; adler += buf[pos+1]; sum2 += adler; adler += buf[pos+2]; sum2 += adler; adler += buf[pos+3]; sum2 += adler; adler += buf[pos+4]; sum2 += adler; adler += buf[pos+5]; sum2 += adler; adler += buf[pos+6]; sum2 += adler; adler += buf[pos+7]; sum2 += adler; adler += buf[pos+8]; sum2 += adler; adler += buf[pos+9]; sum2 += adler; adler += buf[pos+10]; sum2 += adler; adler += buf[pos+11]; sum2 += adler; adler += buf[pos+12]; sum2 += adler; adler += buf[pos+13]; sum2 += adler; adler += buf[pos+14]; sum2 += adler; adler += buf[pos+15]; sum2 += adler; pos += 16; } while (0 != len--) { adler += buf[pos++]; sum2 += adler; } adler %= BASE; sum2 %= BASE; } /* return recombined sums */ return adler | (sum2 << 16); } private uint m_adler = 1; public uint Value { get { return m_adler; } } public void Update (byte[] buf, int pos, int len) { m_adler = Update (m_adler, buf, pos, len); } } }