FreeCalypso > hg > fc-sim-tools
view libutil/gsm7_unpack.c @ 103:3477438b5706 default tip
new fc-simtool command script: oper-sim-test
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 06 Aug 2022 16:34:43 +0000 |
parents | 34bbb0585cab |
children |
line wrap: on
line source
/* * This library module implements unpacking of GSM 7-bit data * from packed octets. */ #include <sys/types.h> static u_char shift[8] = {0, 7, 6, 5, 4, 3, 2, 1}; gsm7_unpack(inbuf, outbuf, nseptets) u_char *inbuf, *outbuf; unsigned nseptets; { u_char *inp = inbuf, *outp = outbuf; unsigned n; for (n = 0; n < nseptets; n++) { *outp++ = (((inp[1] << 8) | inp[0]) >> shift[n&7]) & 0x7F; if (n & 7) inp++; } }