FreeCalypso > hg > sms-coding-utils

annotate libcoding/gsm7_pack.c @ 0:2d0082216916

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
libcoding: beginning with a subset of uptools version
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Aug 2023 00:46:23 +0000
parents
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * This library module implements the function for packing septets into octets.
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 */
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 #include <sys/types.h>
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 gsm7_pack(inbuf, outbuf, noctets)
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 u_char *inbuf, *outbuf;
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 unsigned noctets;
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 {
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 u_char *ip = inbuf, *op = outbuf;
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 unsigned n, c;
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 for (n = 0; n < noctets; n++) {
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 c = n % 7;
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 *op++ = ((ip[1] << 7) | ip[0]) >> c;
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 if (c == 6)
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 ip += 2;
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 else
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 ip += 1;
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 }
2d0082216916 libcoding: beginning with a subset of uptools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 }