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[io] reduce compression buffer length #18449

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[io] reduce compression buffer length #18449

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4 changes: 2 additions & 2 deletions io/io/src/TKey.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -250,7 +250,7 @@ TKey::TKey(const TObject *obj, const char *name, Int_t bufsize, TDirectory* moth
ROOT::RCompressionSetting::EAlgorithm::EValues cxAlgorithm = static_cast<ROOT::RCompressionSetting::EAlgorithm::EValues>(GetFile() ? GetFile()->GetCompressionAlgorithm() : 0);
if (cxlevel > 0 && fObjlen > 256) {
Int_t nbuffers = 1 + (fObjlen - 1)/kMAXZIPBUF;
Int_t buflen = std::max(512,fKeylen + fObjlen + 9*nbuffers + 28); //add 28 bytes in case object is placed in a deleted gap
Int_t buflen = std::max(512, fKeylen + fObjlen);
fBuffer = new char[buflen];
char *objbuf = fBufferRef->Buffer() + fKeylen;
char *bufcur = &fBuffer[fKeylen];
Expand Down Expand Up @@ -345,7 +345,7 @@ TKey::TKey(const void *obj, const TClass *cl, const char *name, Int_t bufsize, T
ROOT::RCompressionSetting::EAlgorithm::EValues cxAlgorithm = static_cast<ROOT::RCompressionSetting::EAlgorithm::EValues>(GetFile() ? GetFile()->GetCompressionAlgorithm() : 0);
if (cxlevel > 0 && fObjlen > 256) {
Int_t nbuffers = 1 + (fObjlen - 1)/kMAXZIPBUF;
Int_t buflen = std::max(512,fKeylen + fObjlen + 9*nbuffers + 28); //add 28 bytes in case object is placed in a deleted gap
Int_t buflen = std::max(512, fKeylen + fObjlen);
fBuffer = new char[buflen];
char *objbuf = fBufferRef->Buffer() + fKeylen;
char *bufcur = &fBuffer[fKeylen];
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2 changes: 1 addition & 1 deletion net/net/src/TMessage.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -361,7 +361,7 @@ Int_t TMessage::Compress()
Int_t messlen = Length() - hdrlen;
Int_t nbuffers = 1 + (messlen - 1) / kMAXZIPBUF;
Int_t chdrlen = 3*sizeof(UInt_t); // compressed buffer header length
Int_t buflen = std::max(512, chdrlen + messlen + 9*nbuffers);
Int_t buflen = std::max(512, chdrlen + messlen);
fBufComp = new char[buflen];
char *messbuf = Buffer() + hdrlen;
char *bufcur = fBufComp + chdrlen;
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2 changes: 1 addition & 1 deletion tree/tree/src/TBasket.cxx
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Expand Up @@ -1227,7 +1227,7 @@ Int_t TBasket::WriteBuffer()
cxAlgorithm = static_cast<ROOT::RCompressionSetting::EAlgorithm::EValues>(file->GetCompressionAlgorithm());
if (cxlevel > 0) {
Int_t nbuffers = 1 + (fObjlen - 1) / kMAXZIPBUF;
Int_t buflen = fKeylen + fObjlen + 9 * nbuffers + 28; //add 28 bytes in case object is placed in a deleted gap
Int_t buflen = fKeylen + fObjlen;
InitializeCompressedBuffer(buflen, file);
if (!fCompressedBufferRef) {
Warning("WriteBuffer", "Unable to allocate the compressed buffer");
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