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BitStream.cc


#include <qpdf/BitStream.hh>

// See comments in bits.cc
#define BITS_READ 1
#include "bits.icc"

BitStream::BitStream(unsigned char const* p, int nbytes) :
    start(p),
    nbytes(nbytes)
{
    reset();
}

void
BitStream::reset()
{
    p = start;
    bit_offset = 7;
    bits_available = 8 * nbytes;
}

unsigned long
BitStream::getBits(int nbits)
{
    return read_bits(this->p, this->bit_offset,
                 this->bits_available, nbits);
}

void
BitStream::skipToNextByte()
{
    if (bit_offset != 7)
    {
      unsigned int bits_to_skip = bit_offset + 1;
      if (bits_available < bits_to_skip)
      {
          throw QEXC::Internal("overflow skipping to next byte in bitstream");
      }
      bit_offset = 7;
      ++p;
      bits_available -= bits_to_skip;
    }
}

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