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rd5 delta progress

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This commit is contained in:
Arndt Brenschede 2020-01-18 17:30:33 +01:00
parent c4f3e7dadf
commit 19a7555483
4 changed files with 468 additions and 46 deletions
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34
brouter-codec/src/main/java/btools/codec/MicroCache.java
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@ -366,4 +366,38 @@ public class MicroCache extends ByteDataWriter
}
}
public void addDelta( MicroCache mc1, MicroCache mc2, boolean keepEmptyNodes )
{
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;
if ( id1 >= id2 ) // data from diff file wins
{
int start2 = idx2 > 0 ? mc2.fapos[idx2 - 1] : 0;
int len2 = mc2.fapos[idx2++] - start2;
if ( keepEmptyNodes || len2 > 0 )
{
write( mc2.ab, start2, len2 );
fapos[size] = aboffset;
faid[size++] = id2;
}
if ( id1 == id2 ) // // id exists in both caches
{
idx1++;
}
}
else // use data from base file
{
int start1 = idx1 > 0 ? mc1.fapos[idx1 - 1] : 0;
int len1 = mc1.fapos[idx1++] - start1;
write( mc1.ab, start1, len1 );
fapos[size] = aboffset;
faid[size++] = id1;
}
}
}
}