database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-08-07 02:42:48 +03:00
Code Activity

Unwrap the loop in the WAL hash function.

Browse Source 
FossilOrigin-Name: eb94ae13206762a42ddad12e0d1461df83e9759e44a369f188cd3aad82f211c4
This commit is contained in:
drh
2023-04-12 20:23:03 +00:00
parent be0023faba
commit 3f4a319934
3 changed files with 34 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
src/wal.c
View File

@@ -746,19 +746,40 @@ static void walChecksumBytes(
assert( nByte>=8 );
assert( (nByte&0x00000007)==0 );
assert( nByte<=65536 );
assert( nByte%4==0 );
if( nativeCksum ){
do {
s1 += *aData++ + s2;
s2 += *aData++ + s1;
}while( aData<aEnd );
}else{
if( !nativeCksum ){
do {
s1 += BYTESWAP32(aData[0]) + s2;
s2 += BYTESWAP32(aData[1]) + s1;
aData += 2;
}while( aData<aEnd );
}else if( nByte%64==0 ){
do {
s1 += *aData++ + s2;
s2 += *aData++ + s1;
s1 += *aData++ + s2;
s2 += *aData++ + s1;
s1 += *aData++ + s2;
s2 += *aData++ + s1;
s1 += *aData++ + s2;
s2 += *aData++ + s1;
s1 += *aData++ + s2;
s2 += *aData++ + s1;
s1 += *aData++ + s2;
s2 += *aData++ + s1;
s1 += *aData++ + s2;
s2 += *aData++ + s1;
s1 += *aData++ + s2;
s2 += *aData++ + s1;
}while( aData<aEnd );
}else{
do {
s1 += *aData++ + s2;
s2 += *aData++ + s1;
}while( aData<aEnd );
}
assert( aData==aEnd );
aOut[0] = s1;
aOut[1] = s2;