diff options
Diffstat (limited to 'libqpdf/BitStream.cc')
-rw-r--r-- | libqpdf/BitStream.cc | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/libqpdf/BitStream.cc b/libqpdf/BitStream.cc index 14eae55d..bb52af31 100644 --- a/libqpdf/BitStream.cc +++ b/libqpdf/BitStream.cc @@ -30,6 +30,23 @@ BitStream::getBits(int nbits) this->bits_available, nbits); } +long long +BitStream::getBitsSigned(int nbits) +{ + unsigned long long bits = read_bits(this->p, this->bit_offset, + this->bits_available, nbits); + long long result = 0; + if (static_cast<long long>(bits) > 1 << (nbits - 1)) + { + result = static_cast<long long>(bits - (1 << nbits)); + } + else + { + result = static_cast<long long>(bits); + } + return result; +} + void BitStream::skipToNextByte() { |