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Added SDL_crc32()

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This commit is contained in:
Sam Lantinga 2020-11-16 15:00:15 -08:00
parent 3d48fc05c3
commit 71e32f5e1b
11 changed files with 83 additions and 50 deletions
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21
src/joystick/hidapi/SDL_hidapijoystick.c
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@ -390,27 +390,6 @@ HIDAPI_ShutdownDiscovery()
#endif
}
/* Public domain CRC implementation adapted from:
http://home.thep.lu.se/~bjorn/crc/crc32_simple.c
*/
static Uint32 crc32_for_byte(Uint32 r)
{
int i;
for(i = 0; i < 8; ++i) {
r = (r & 1? 0: (Uint32)0xEDB88320L) ^ r >> 1;
}
return r ^ (Uint32)0xFF000000L;
}
Uint32 crc32(Uint32 crc, const void *data, int count)
{
int i;
for(i = 0; i < count; ++i) {
crc = crc32_for_byte((Uint8)crc ^ ((const Uint8*)data)[i]) ^ crc >> 8;
}
return crc;
}
void
HIDAPI_DumpPacket(const char *prefix, Uint8 *data, int size)
{