initial import

1 files changed, 45 insertions, 0 deletions

diff --git a/bitreader.cc b/bitreader.cc
new file mode 100644
index 0000000..dd85f74
--- /dev/null
+++ b/bitreader.cc
@@ -0,0 +1,45 @@
+#include "bitreader.h"
+
+BitReader::BitReader(QIODevice *device)
+	: child(device), buf(0), avail(0)
+{
+}
+
+BitReader::~BitReader()
+{
+}
+
+quint64 BitReader::readBits(int n)
+{
+	quint64 x = peekBits(n);
+
+	Q_ASSERT(avail >= n);
+	buf -= x << (avail - n);
+	avail -= n;
+
+	return x;
+}
+
+quint64 BitReader::peekBits(int n)
+{
+	while (n > avail) {
+		char c;
+		child->getChar(&c);
+		buf = (buf << 8) | (quint8)(c);
+		avail += 8;
+	}
+	quint64 x = buf >> (avail - n);
+
+	return x;
+}
+
+void BitReader::skipUntilNextByte()
+{
+	int skip = avail % 8;
+	readBits(skip);
+}
+
+bool BitReader::atEnd()
+{
+	return avail == 0 && child->atEnd();
+}