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Poddav
2014-07-21 23:26:28 +04:00
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GameRes/Utility.cs Normal file
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//! \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);
}
}
}