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annotate uptools/libcoding/gsm7_pack.c @ 416:30f6d1c32c6f

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doc/Flash-boot-defect article removed (no longer relevant) This article is no longer relevant because the issue in question only affected one (1) defective FCDEV3B board which was not and never will be sold.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 26 Oct 2018 07:11:08 +0000
parents 15120d15cab5
children
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15120d15cab5 uptools/libcoding: septet to octet packing function implemented
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
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2 * This library module implements the function for packing septets into octets.
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
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3 */
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
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4
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
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5 #include <sys/types.h>
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
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6
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
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7 gsm7_pack(inbuf, outbuf, noctets)
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
Mychaela Falconia <falcon@freecalypso.org>
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8 u_char *inbuf, *outbuf;
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
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9 unsigned noctets;
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
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10 {
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
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11 u_char *ip = inbuf, *op = outbuf;
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
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12 unsigned n, c;
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13
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14 for (n = 0; n < noctets; n++) {
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
Mychaela Falconia <falcon@freecalypso.org>
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15 c = n % 7;
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
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16 *op++ = ((ip[1] << 7) | ip[0]) >> c;
15120d15cab5 uptools/libcoding: septet to octet packing function implemented
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17 if (c == 6)
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18 ip += 2;
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19 else
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20 ip += 1;
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21 }
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22 }