uint32_t HPACKDecoder::decodeIndexedHeader(HPACKDecodeBuffer& dbuf,
headers_t* emitted) {
uint32_t index;
err_ = dbuf.decodeInteger(7, index);
if (err_ != HPACK::DecodeError::NONE) {
LOG(ERROR) << "Decode error decoding index err_=" << err_;
return 0;
}
// validate the index
if (index == 0 || !isValid(index)) {
LOG(ERROR) << "received invalid index: " << index;
err_ = HPACK::DecodeError::INVALID_INDEX;
return 0;
}
uint32_t emittedSize = 0;
if (isStatic(index)) {
auto& header = getStaticHeader(index);
emittedSize = emit(header, emitted);
} else {
auto& header = getDynamicHeader(index);
emittedSize = emit(header, emitted);
}
return emittedSize;
}
void HPACKEncoder::encodeHeader(const HPACKHeader& header) {
uint32_t index = getIndex(header);
if (index) {
// firstly check if it's part of the static table
if (isStatic(index)) {
encodeAsIndex(index);
// insert the static header in the dynamic header table
// to take advantage of the delta compression
if (table_.add(getStaticHeader(index))) {
table_.addReference(1);
}
} else if (!table_.inReferenceSet(globalToDynamicIndex(index))) {
table_.addReference(globalToDynamicIndex(index));
encodeAsIndex(index);
} else {
// there's nothing to encode, but keep a record for it in case of eviction
table_.addSkippedReference(globalToDynamicIndex(index));
}
} else {
encodeAsLiteral(header);
}
}
uint32_t HPACKDecoder::decodeIndexedHeader(HPACKDecodeBuffer& dbuf,
headers_t* emitted) {
uint32_t index;
err_ = dbuf.decodeInteger(7, index);
if (err_ != DecodeError::NONE) {
LOG(ERROR) << "Decode error decoding header index err_=" << err_;
return 0;
}
if (index == 0) {
table_.clearReferenceSet();
return 0;
}
// validate the index
if (!isValid(index)) {
LOG(ERROR) << "received invalid index: " << index;
err_ = DecodeError::INVALID_INDEX;
return 0;
}
uint32_t emittedSize = 0;
// a static index cannot be part of the reference set
if (isStatic(index)) {
auto& header = getStaticHeader(index);
emittedSize = emit(header, emitted);
if (table_.add(header)) {
table_.addReference(1);
}
} else if (table_.inReferenceSet(globalToDynamicIndex(index))) {
// index remove operation
table_.removeReference(globalToDynamicIndex(index));
} else {
auto& header = getDynamicHeader(index);
emittedSize = emit(header, emitted);
table_.addReference(globalToDynamicIndex(index));
}
return emittedSize;
}
std::string EditFoodResponse::getHeader()
{
return getStaticHeader();
}
std::string DeleteInventoryResponse::getHeader()
{
return getStaticHeader();
}