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annotate uptools/libcoding/gsm7_unpack.c @ 995:74024eb17e04

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fc-loadtool help: improve language regarding 16 MiB flash chips In FC project history, 16 MiB flash originally meant Pirelli DP-L10. Then we got FCDEV3B with the same flash (our own design), but now we are discovering more Calypso devices that used such large flash, both late Calypso era (Sony Ericsson K2x0) as well as much earlier ones (FIC FLUID devices.txt file with 2004 dates, Leonardo+ rev 5). Hence we need to migrate to more generic or neutral language in associated documentation, without giving elevated status to specific examples that drove our early project history.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 03 Dec 2023 21:11:12 +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 }