FreeCalypso > hg > fc-sim-tools

annotate libutil/gsm7_unpack.c @ 22:f893cdde97a4

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
updated top-level README added
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Mar 2021 08:20:20 +0000
parents 34bbb0585cab
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
8
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * This library module implements unpacking of GSM 7-bit data
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 * from packed octets.
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 */
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 #include <sys/types.h>
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 static u_char shift[8] = {0, 7, 6, 5, 4, 3, 2, 1};
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 gsm7_unpack(inbuf, outbuf, nseptets)
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 u_char *inbuf, *outbuf;
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 unsigned nseptets;
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 {
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 u_char *inp = inbuf, *outp = outbuf;
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 unsigned n;
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 for (n = 0; n < nseptets; n++) {
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 *outp++ = (((inp[1] << 8) | inp[0]) >> shift[n&7]) & 0x7F;
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 if (n & 7)
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 inp++;
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 }
34bbb0585cab libutil: import from previous fc-pcsc-tools version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 }