The story so far

1 files changed, 44 insertions, 0 deletions

diff --git a/lpg/libqr/bitstream.h b/lpg/libqr/bitstream.h
new file mode 100644
index 0000000..12412bc
--- /dev/null
+++ b/lpg/libqr/bitstream.h
@@ -0,0 +1,44 @@
+#ifndef QR_BITSTREAM_H
+#define QR_BITSTREAM_H
+
+#include <stddef.h>
+
+/**
+ * Note: when writing / reading multiple bits, the
+ * _most_ significant bits come first in the stream.
+ * (That is, the order you would naturally write the
+ * number in binary)
+ */
+
+struct bitstream;
+
+struct bitstream * bitstream_create(void);
+int                bitstream_resize(struct bitstream *, size_t bits);
+void               bitstream_destroy(struct bitstream *);
+struct bitstream * bitstream_copy(const struct bitstream *);
+
+void bitstream_seek(struct bitstream *, size_t pos);
+size_t bitstream_tell(const struct bitstream *);
+size_t bitstream_remaining(const struct bitstream *);
+size_t bitstream_size(const struct bitstream *);
+
+unsigned int bitstream_read(struct bitstream *, size_t bits);
+
+void bitstream_unpack(struct bitstream *,
+                      unsigned int * result,
+                      size_t         count,
+                      size_t         bitsize);
+
+int bitstream_write(struct bitstream *,
+                    unsigned int value,
+                    size_t       bits);
+
+int bitstream_pack(struct bitstream *,
+                   const unsigned int * values,
+                   size_t               count,
+                   size_t               bitsize);
+
+int bitstream_cat(struct bitstream *, const struct bitstream * src);
+
+#endif
+