-osmocore_HEADERS = signal.h linuxlist.h timer.h select.h msgb.h \
+osmocore_HEADERS = signal.h linuxlist.h timer.h select.h msgb.h bits.h \
tlv.h bitvec.h comp128.h statistics.h gsm_utils.h utils.h \
gsmtap.h write_queue.h rsl.h gsm48.h rxlev_stat.h mncc.h \
gsm48_ie.h logging.h gsm0808.h rate_ctr.h gsmtap_util.h \
--- /dev/null
+#ifndef _OSMO_BITS_H
+#define _OSMO_BITS_H
+
+#include <stdint.h>
+
+typedef uint8_t sbit_t; /* soft bit (-127...127) */
+typedef uint8_t ubit_t; /* unpacked bit (0 or 1) */
+typedef uint8_t pbit_t; /* packed bis (8 bits in a byte) */
+
+/* determine how many bytes we would need for 'num_bits' packed bits */
+static inline unsigned int osmo_pbit_bytesize(unsigned int num_bits)
+{
+ unsigned int pbit_bytesize = num_bits / 8;
+
+ if (num_bits % 8)
+ pbit_bytesize++;
+
+ return pbit_bytesize;
+}
+
+/* convert unpacked bits to packed bits, return length in bytes */
+int osmo_ubit2pbit(pbit_t *out, const ubit_t *in, unsigned int num_bits);
+
+/* convert packed bits to unpacked bits, return length in bytes */
+int osmo_pbit2ubit(ubit_t *out, const pbit_t *in, unsigned int num_bits);
+
+#endif
lib_LTLIBRARIES = libosmocore.la
-libosmocore_la_SOURCES = timer.c select.c signal.c msgb.c rxlev_stat.c \
+libosmocore_la_SOURCES = timer.c select.c signal.c msgb.c rxlev_stat.c bits.c \
tlv_parser.c bitvec.c comp128.c gsm_utils.c statistics.c \
write_queue.c utils.c rsl.c gsm48.c gsm48_ie.c \
logging.c gsm0808.c rate_ctr.c gsmtap_util.c \
--- /dev/null
+
+#include <stdint.h>
+
+#include <osmocore/bits.h>
+
+/* convert unpacked bits to packed bits, return length in bytes */
+int osmo_ubit2pbit(pbit_t *out, const ubit_t *in, unsigned int num_bits)
+{
+ unsigned int i;
+ uint8_t curbyte = 0;
+ pbit_t *outptr = out;
+
+ for (i = 0; i < num_bits; i++) {
+ uint8_t bitnum = 7 - (i % 8);
+
+ curbyte |= (in[i] << bitnum);
+
+ if (i > 0 && i % 8 == 0) {
+ *outptr++ = curbyte;
+ curbyte = 0;
+ }
+ }
+ /* we have a non-modulo-8 bitcount */
+ if (i % 8)
+ *outptr++ = curbyte;
+
+ return outptr - out;
+}
+
+/* convert packed bits to unpacked bits, return length in bytes */
+int osmo_pbit2ubit(ubit_t *out, const pbit_t *in, unsigned int num_bits)
+{
+ unsigned int i;
+ ubit_t *cur = out;
+ ubit_t *limit = out + num_bits;
+
+ for (i = 0; i < (num_bits/8)+1; i++) {
+ pbit_t byte = in[i];
+ *cur++ = (byte >> 7) & 1;
+ if (cur >= limit)
+ break;
+ *cur++ = (byte >> 6) & 1;
+ if (cur >= limit)
+ break;
+ *cur++ = (byte >> 5) & 1;
+ if (cur >= limit)
+ break;
+ *cur++ = (byte >> 4) & 1;
+ if (cur >= limit)
+ break;
+ *cur++ = (byte >> 3) & 1;
+ if (cur >= limit)
+ break;
+ *cur++ = (byte >> 2) & 1;
+ if (cur >= limit)
+ break;
+ *cur++ = (byte >> 1) & 1;
+ if (cur >= limit)
+ break;
+ *cur++ = (byte >> 0) & 1;
+ if (cur >= limit)
+ break;
+ }
+ return cur - out;
+}