FreeCalypso > hg > freecalypso-tools
view uptools/libcoding/gsm7_unpack.c @ 797:ef501e258036
doc/opt-freecalypso-tree: add sim-data and sim-scripts
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 19 Mar 2021 06:17:58 +0000 |
parents | d29b45c4c8db |
children |
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/* * 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++; } }