bool ShiftableBuffer::Sync(const byte_t* apPattern, size_t aNumBytes)
{
if(aNumBytes < 1) throw ArgumentException(LOCATION, "Pattern must be at least 1 byte");
size_t offset = SyncSubsequence(apPattern, aNumBytes, 0);
bool res = (this->NumReadBytes() - offset) >= aNumBytes;
if(offset > 0) this->AdvanceRead(offset);
return res;
}
bool ShiftableBuffer::Sync(const uint8_t* apPattern, size_t aNumBytes)
{
if(aNumBytes < 1) {
MACRO_THROW_EXCEPTION(ArgumentException, "Pattern must be at least 1 byte");
}
size_t offset = SyncSubsequence(apPattern, aNumBytes, 0);
bool res = (this->NumReadBytes() - offset) >= aNumBytes;
if(offset > 0) this->AdvanceRead(offset);
return res;
}
size_t ShiftableBuffer::SyncSubsequence(const uint8_t* apPattern, size_t aNumPatternBytes, size_t aOffset)
{
size_t read_bytes = this->NumReadBytes() - aOffset;
if(aNumPatternBytes > read_bytes) aNumPatternBytes = read_bytes;
const uint8_t* pRead = this->ReadBuff() + aOffset;
for(size_t i = 0; i < aNumPatternBytes; ++i) {
if(apPattern[i] != pRead[i])
return SyncSubsequence(apPattern, aNumPatternBytes, aOffset + 1);
}
return aOffset;
}