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Merging control records having zero in their first triplet with the p… #2

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Merged
merged 1 commit into from
Sep 15, 2018
Merged

Merging control records having zero in their first triplet with the p… #2

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40 changes: 33 additions & 7 deletions bsdiff.c
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Original file line number Diff line number Diff line change
Expand Up @@ -222,6 +222,7 @@ static int bsdiff_internal(const struct bsdiff_request req)
int64_t *I,*V;
int64_t scan,pos,len;
int64_t lastscan,lastpos,lastoffset;
int64_t ctrlcur[3],ctrlnext[3];
int64_t oldscore,scsc;
int64_t s,Sf,lenf,Sb,lenb;
int64_t overlap,Ss,lens;
Expand All @@ -240,6 +241,7 @@ static int bsdiff_internal(const struct bsdiff_request req)
/* Compute the differences, writing ctrl as we go */
scan=0;len=0;pos=0;
lastscan=0;lastpos=0;lastoffset=0;
ctrlcur[0]=0;ctrlcur[1]=0;ctrlcur[2]=0;
while(scan<req.newsize) {
oldscore=0;

Expand Down Expand Up @@ -292,13 +294,27 @@ static int bsdiff_internal(const struct bsdiff_request req)
lenb-=lens;
};

offtout(lenf,buf);
offtout((scan-lenb)-(lastscan+lenf),buf+8);
offtout((pos-lenb)-(lastpos+lenf),buf+16);

/* Write control data */
if (writedata(req.stream, buf, sizeof(buf)))
return -1;
ctrlnext[0]=lenf;
ctrlnext[1]=(scan-lenb)-(lastscan+lenf);
ctrlnext[2]=(pos-lenb)-(lastpos+lenf);

if (ctrlnext[0]) {
if (ctrlcur[0]||ctrlcur[1]||ctrlcur[2]) {
offtout(ctrlcur[0],buf);
offtout(ctrlcur[1],buf+8);
offtout(ctrlcur[2],buf+16);

/* Write control data */
if (writedata(req.stream, buf, sizeof(buf)))
return -1;
};
ctrlcur[0]=ctrlnext[0];
ctrlcur[1]=ctrlnext[1];
ctrlcur[2]=ctrlnext[2];
} else {
ctrlcur[1]+=ctrlnext[1];
ctrlcur[2]+=ctrlnext[2];
};

/* Write diff data */
for(i=0;i<lenf;i++)
Expand All @@ -318,6 +334,16 @@ static int bsdiff_internal(const struct bsdiff_request req)
};
};

if (ctrlcur[0]||ctrlcur[1]) {
offtout(ctrlcur[0],buf);
offtout(ctrlcur[1],buf+8);
offtout(ctrlcur[2],buf+16);

/* Write control data */
if (writedata(req.stream, buf, sizeof(buf)))
return -1;
};

return 0;
}

Expand Down