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authorSylvain Munaut <tnt@246tNt.com>2011-01-21 12:22:30 +0100
committerSylvain Munaut <tnt@246tNt.com>2011-01-21 12:22:30 +0100
commitaeb10770510decf85797c8768285641639be9026 (patch)
tree1a3a767e5ef43a40c04041c46b17bed831adec74 /src/bits.c
parent2230c133a69e8f9660051aff61626996deba4ed8 (diff)
bits: Add extended options version of pbit2ubit and ubit2pbit
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Diffstat (limited to 'src/bits.c')
-rw-r--r--src/bits.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/src/bits.c b/src/bits.c
index fb3c7224..029cfe55 100644
--- a/src/bits.c
+++ b/src/bits.c
@@ -63,3 +63,36 @@ int osmo_pbit2ubit(ubit_t *out, const pbit_t *in, unsigned int num_bits)
}
return cur - out;
}
+
+/* convert unpacked bits to packed bits (extended options but slower),
+ * return length in bytes (max written ofs of output buffer + 1) */
+int osmo_ubit2pbit_ext(pbit_t *out, unsigned int out_ofs,
+ const ubit_t *in, unsigned int in_ofs,
+ unsigned int num_bits, int lsb_mode)
+{
+ int i, op, bn;
+ for (i=0; i<num_bits; i++) {
+ op = out_ofs + i;
+ bn = lsb_mode ? (op&7) : (7-(op&7));
+ if (in[in_ofs+i])
+ out[op>>3] |= 1 << bn;
+ else
+ out[op>>3] &= ~(1 << bn);
+ }
+ return ((out_ofs + num_bits - 1) >> 3) + 1;
+}
+
+/* convert packed bits to unpacked bits (extended options but slower),
+ * return length in bytes (max written ofs of output buffer + 1) */
+int osmo_pbit2ubit_ext(ubit_t *out, unsigned int out_ofs,
+ const pbit_t *in, unsigned int in_ofs,
+ unsigned int num_bits, int lsb_mode)
+{
+ int i, ip, bn;
+ for (i=0; i<num_bits; i++) {
+ ip = in_ofs + i;
+ bn = lsb_mode ? (ip&7) : (7-(ip&7));
+ out[out_ofs+i] = !!(in[ip>>3] & (1<<bn));
+ }
+ return out_ofs + num_bits;
+}