FreeCalypso > hg > freecalypso-tools

annotate uptools/libcoding/gsm7_unpack.c @ 1012:11391cb6bdc0

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
patch from fixeria: doc change from SE K2x0 to K2xx Since their discovery in late 2022, Sony Ericsson K200 and K220 phones were collectively referred to as SE K2x0 in FreeCalypso documentation. However, now that SE K205 has been discovered as yet another member of the same family (same PCBA in different case), it makes more sense to refer to the whole family as SE K2xx.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 23 Sep 2024 12:23:20 +0000
parents d29b45c4c8db
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
330
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * This library module implements unpacking of GSM 7-bit data
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 * from packed octets.
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 */
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 #include <sys/types.h>
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 static u_char shift[8] = {0, 7, 6, 5, 4, 3, 2, 1};
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 gsm7_unpack(inbuf, outbuf, nseptets)
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 u_char *inbuf, *outbuf;
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 unsigned nseptets;
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 {
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 u_char *inp = inbuf, *outp = outbuf;
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 unsigned n;
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 for (n = 0; n < nseptets; n++) {
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 *outp++ = (((inp[1] << 8) | inp[0]) >> shift[n&7]) & 0x7F;
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 if (n & 7)
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 inp++;
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 }
d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 }