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c44ec7454This file is pinned to the selected release. Download the original to open it in your design tool.
c44ec7454This file is pinned to the selected release. Download the original to open it in your design tool.
#include "xsmc.h"
void xs_stackchan_usb_crc32(xsMachine *the)
{
uint8_t *source;
xsUnsignedValue length;
xsmcGetBufferReadable(xsArg(0), (void **)&source, &length);
if (xsmcArgc > 1) {
xsIntegerValue requested = xsmcToInteger(xsArg(1));
if ((requested < 0) || ((xsUnsignedValue)requested > length))
xsRangeError("invalid CRC32 length");
length = (xsUnsignedValue)requested;
}
uint32_t crc = 0xFFFFFFFF;
while (length--) {
crc ^= *source++;
for (uint8_t bit = 0; bit < 8; bit++)
crc = (crc >> 1) ^ ((crc & 1) ? 0xEDB88320 : 0);
}
xsmcSetNumber(xsResult, (xsNumberValue)(crc ^ 0xFFFFFFFF));
}
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