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Refactored PageChecksumCodec::checksum

This commit is contained in:
Trevor Clinkenbeard 2019-05-16 16:05:44 -07:00
parent 90d886df95
commit d7bcbe1210
1 changed files with 3 additions and 4 deletions
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7
fdbserver/KeyValueStoreSQLite.actor.cpp
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@ -91,17 +91,16 @@ struct PageChecksumCodec {
char *pData = (char *)data; char *pData = (char *)data;
int dataLen = pageLen - sizeof(SumType); int dataLen = pageLen - sizeof(SumType);
SumType sum;
SumType *pSumInPage = (SumType *)(pData + dataLen); SumType *pSumInPage = (SumType *)(pData + dataLen);
if (write) { if (write) {
// Always write a CRC32 checksum for new pages // Always write a CRC32 checksum for new pages
sum.part1 = 0; // Indicates CRC32 is being used pSumInPage->part1 = 0; // Indicates CRC32 is being used
sum.part2 = crc32c_append(0xfdbeefdb, static_cast<uint8_t*>(data), dataLen); pSumInPage->part2 = crc32c_append(0xfdbeefdb, static_cast<uint8_t*>(data), dataLen);
*pSumInPage = sum;
return true; return true;
} }
SumType sum;
if (pSumInPage->part1 == 0) { if (pSumInPage->part1 == 0) {
// part1 being 0 indicates with high probability that a CRC32 checksum // part1 being 0 indicates with high probability that a CRC32 checksum
// was used, so check that first. If this checksum fails, there is still // was used, so check that first. If this checksum fails, there is still