Added typical signalization channels (CCCH, BCCH, SDCCH) decoder and demapper for BCCH.
The implementation is quite dirty at this moment.
diff --git a/lib/decoding/cch.h b/lib/decoding/cch.h
new file mode 100644
index 0000000..efd5615
--- /dev/null
+++ b/lib/decoding/cch.h
@@ -0,0 +1,59 @@
+//TODO: this file shouldn't be part of the GSM Receiver
+#ifndef __GSMSTACK_CCH_H__
+#define __GSMSTACK_CCH_H__ 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//#include "gsmstack.h"
+
+/*
+ * decode_cch
+ *
+ * Decode a "common" control channel. Most control channels use
+ * the same burst, interleave, Viterbi and parity configuration.
+ * The documentation for the control channels defines SACCH first
+ * and then just keeps referring to that.
+ *
+ * The current (investigated) list is as follows:
+ *
+ * BCCH Norm
+ * BCCH Ext
+ * PCH
+ * AGCH
+ * CBCH (SDCCH/4)
+ * CBCH (SDCCH/8)
+ * SDCCH/4
+ * SACCH/C4
+ * SDCCH/8
+ * SACCH/C8
+ *
+ * We provide two functions, one for where all four bursts are
+ * contiguous, and one where they aren't.
+ */
+
+#define DATA_BLOCK_SIZE 184
+#define PARITY_SIZE 40
+#define FLUSH_BITS_SIZE 4
+#define PARITY_OUTPUT_SIZE (DATA_BLOCK_SIZE + PARITY_SIZE + FLUSH_BITS_SIZE)
+
+#define CONV_INPUT_SIZE PARITY_OUTPUT_SIZE
+#define CONV_SIZE (2 * CONV_INPUT_SIZE)
+
+#define BLOCKS 4
+#define iBLOCK_SIZE (CONV_SIZE / BLOCKS)
+#define eBLOCK_SIZE (iBLOCK_SIZE + 2)
+
+int conv_decode(unsigned char *output, unsigned char *data);
+int parity_check(unsigned char *d);
+//unsigned char *decode_cch(GS_CTX *ctx, unsigned char *burst, unsigned int *len);
+//unsigned char *decode_facch(GS_CTX *ctx, unsigned char *burst, unsigned int *len, int offset);
+//unsigned char *decode_cch(GS_CTX *ctx, unsigned char *, unsigned char *, unsigned char *, unsigned char *, unsigned int *len);
+//unsigned char *decode_cch(GS_CTX *ctx, unsigned char *, unsigned int *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif