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annotate uptools/libcoding/gsm7_unpack.c @ 926:6a0aa8d36d06

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rvinterf backslash escape: introduce libprint The new helper function library named libprint is meant to replace the badly misnamed libg23, and will soon contain functions for printing all of the same kinds of GPF TST packets that are now handled in libg23. However, we are also moving safe_print_trace() from libasync to this new library, and changing it to emit our new backslash escape format.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 May 2023 03:47:46 +0000
parents d29b45c4c8db
children
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d29b45c4c8db uptools/libcoding: 7-bit decoding implemented
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1 /*
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2 * This library module implements unpacking of GSM 7-bit data
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3 * from packed octets.
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4 */
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5
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6 #include <sys/types.h>
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7
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8 static u_char shift[8] = {0, 7, 6, 5, 4, 3, 2, 1};
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9
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10 gsm7_unpack(inbuf, outbuf, nseptets)
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11 u_char *inbuf, *outbuf;
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12 unsigned nseptets;
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13 {
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14 u_char *inp = inbuf, *outp = outbuf;
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15 unsigned n;
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16
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17 for (n = 0; n < nseptets; n++) {
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18 *outp++ = (((inp[1] << 8) | inp[0]) >> shift[n&7]) & 0x7F;
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19 if (n & 7)
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20 inp++;
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21 }
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22 }