1 files changed, 45 insertions, 0 deletions
diff --git a/libqpdf/BitStream.cc b/libqpdf/BitStream.cc
new file mode 100644
index 00000000..c6fda4e6
--- /dev/null
+++ b/libqpdf/BitStream.cc
@@ -0,0 +1,45 @@
+
+
+#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;
+    }
+}