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proof of concept delta-rd5

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This commit is contained in:
Arndt Brenschede 2019-09-08 13:35:12 +02:00
parent c32d3dc165
commit a69fb1c99a
4 changed files with 209 additions and 10 deletions
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52
brouter-codec/src/main/java/btools/codec/MicroCache.java
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@ -314,4 +314,56 @@ public class MicroCache extends ByteDataWriter
}
return null;
}
public void calcDelta( MicroCache mc1, MicroCache mc2 )
{
int idx1 = 0;
int idx2 = 0;
while( idx1 < mc1.size || idx2 < mc2.size )
{
int id1 = idx1 < mc1.size ? mc1.faid[idx1] : Integer.MAX_VALUE;
int id2 = idx2 < mc2.size ? mc2.faid[idx2] : Integer.MAX_VALUE;
int id;
if ( id1 >= id2 )
{
id = id2;
int start2 = idx2 > 0 ? mc2.fapos[idx2 - 1] : 0;
int len2 = mc2.fapos[idx2++] - start2;
if ( id1 == id2 )
{
// id exists in both caches, compare data
int start1 = idx1 > 0 ? mc1.fapos[idx1 - 1] : 0;
int len1 = mc1.fapos[idx1++] - start1;
if ( len1 == len2 )
{
int i = 0;
while( i<len1 )
{
if ( mc1.ab[start1+i] != mc2.ab[start2+i] )
{
break;
}
i++;
}
if ( i == len1 )
{
continue; // same data -> do nothing
}
}
}
write( mc2.ab, start2, len2 );
}
else
{
idx1++;
id = id1; // deleted node
}
fapos[size] = aboffset;
faid[size] = id;
size++;
}
}
}