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This commit is contained in:
Stanislav Shwartsman 2008-04-07 18:48:11 +00:00
parent fea49bb270
commit 1fc892406c
1 changed files with 16 additions and 16 deletions
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32
bochs/crc.cc
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@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: crc.cc,v 1.1 2006-01-24 19:03:53 sshwarts Exp $
// $Id: crc.cc,v 1.2 2008-04-07 18:48:11 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// I grabbed these CRC routines from the following source:
@ -40,26 +40,26 @@ static Bit32u crc32_table[256];
static void init_crc32(void)
{
int i, j;
Bit32u c;
int i, j;
Bit32u c;
for (i = 0; i < 256; ++i) {
for (c = i << 24, j = 8; j > 0; --j)
c = c & 0x80000000 ? (c << 1) ^ CRC32_POLY : (c << 1);
crc32_table[i] = c;
}
for (i = 0; i < 256; ++i) {
for (c = i << 24, j = 8; j > 0; --j)
c = c & 0x80000000 ? (c << 1) ^ CRC32_POLY : (c << 1);
crc32_table[i] = c;
}
}
Bit32u crc32(const Bit8u *buf, int len)
{
const Bit8u *p;
Bit32u crc;
const Bit8u *p;
Bit32u crc;
if (!crc32_table[1]) /* if not already done, */
init_crc32(); /* build table */
if (!crc32_table[1]) /* if not already done, */
init_crc32(); /* build table */
crc = 0xffffffff; /* preload shift register, per CRC-32 spec */
for (p = buf; len > 0; ++p, --len)
crc = (crc << 8) ^ crc32_table[(crc >> 24) ^ *p];
return ~crc; /* transmit complement, per CRC-32 spec */
crc = 0xffffffff; /* preload shift register, per CRC-32 spec */
for (p = buf; len > 0; ++p, --len)
crc = (crc << 8) ^ crc32_table[(crc >> 24) ^ *p];
return ~crc; /* transmit complement, per CRC-32 spec */
}