FreeCalypso > hg > freecalypso-tools
view tchtools/efr2dsp.c @ 921:74d284add54d
fc-fsio: guard against bogus readdir results from the target
If the FFS being operated on contains SE K2x0 extended filenames,
readdir will return strings that are bad for printing. We need to
guard against this possibility, and also against possible other
bogosity that could be sent by other alien firmwares.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 31 Dec 2022 22:55:23 +0000 |
parents | 94890123a74f |
children |
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/* * The utility function implemented in this module constructs a 33-byte * frame for loading into Calypso DSP TCH UL buffer from a standard * 244-bit EFR codec frame in the RTP encoding format of ETSI TS 101 318. */ #include <sys/types.h> #include <string.h> #include <strings.h> static const u_short efr_to_tidsp_table[244] = { 50, 24, 25, 37, 38, 43, 44, 26, 42, 27, 39, 40, 45, 51, 52, 41, 46, 28, 29, 47, 53, 77, 78, 30, 54, 55, 79, 56, 80, 109, 110, 111, 112, 113, 114, 115, 180, 181, 0, 1, 2, 3, 4, 5, 20, 31, 32, 16, 73, 105, 157, 81, 118, 138, 165, 82, 119, 139, 166, 83, 120, 140, 167, 84, 121, 141, 168, 85, 122, 186, 200, 204, 224, 244, 205, 225, 245, 206, 226, 246, 207, 227, 247, 208, 228, 248, 17, 61, 101, 153, 161, 12, 13, 22, 35, 48, 116, 18, 74, 106, 158, 86, 123, 142, 169, 87, 124, 143, 170, 88, 125, 144, 171, 89, 126, 145, 172, 90, 127, 189, 201, 209, 229, 249, 210, 230, 250, 211, 231, 251, 212, 232, 252, 213, 233, 253, 19, 62, 102, 154, 162, 6, 7, 8, 9, 10, 11, 21, 33, 34, 57, 75, 107, 159, 91, 128, 146, 173, 92, 129, 147, 174, 93, 130, 148, 175, 94, 131, 149, 176, 95, 132, 192, 202, 214, 234, 254, 215, 235, 255, 216, 236, 256, 217, 237, 257, 218, 238, 258, 59, 63, 103, 155, 163, 14, 15, 23, 36, 49, 117, 58, 76, 108, 160, 96, 133, 150, 177, 97, 134, 198, 199, 98, 135, 151, 178, 99, 136, 152, 179, 100, 137, 195, 203, 219, 239, 259, 220, 240, 260, 221, 241, 261, 222, 242, 262, 223, 243, 263, 60, 64, 104, 156, 164 }; static int msb_get_bit(buf, bn) u_char *buf; { int pos_byte = bn >> 3; int pos_bit = 7 - (bn & 7); return (buf[pos_byte] >> pos_bit) & 1; } static void msb_set_bit(buf, bn) u_char *buf; { int pos_byte = bn >> 3; int pos_bit = 7 - (bn & 7); buf[pos_byte] |= (1 << pos_bit); } void efr_std_to_tidsp(inbytes, outbytes) u_char *inbytes, *outbytes; { int i; bzero(outbytes, 33); for (i = 0; i < 244; i++) { if (msb_get_bit(inbytes, i + 4)) msb_set_bit(outbytes, efr_to_tidsp_table[i]); } /* set repetition bits */ if (outbytes[23] & 0x20) outbytes[23] |= 0x18; if (outbytes[23] & 0x04) outbytes[23] |= 0x03; if (outbytes[24] & 0x80) outbytes[24] |= 0x60; if (outbytes[24] & 0x10) outbytes[24] |= 0x0C; }