diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/crc.c | 266 | ||||
| -rw-r--r-- | src/crc.h | 59 | ||||
| -rw-r--r-- | src/fec/LICENSE | 502 | ||||
| -rw-r--r-- | src/fec/README.md | 12 | ||||
| -rw-r--r-- | src/fec/char.h | 24 | ||||
| -rw-r--r-- | src/fec/decode_rs.h | 298 | ||||
| -rw-r--r-- | src/fec/decode_rs_char.c | 22 | ||||
| -rw-r--r-- | src/fec/encode_rs.h | 58 | ||||
| -rw-r--r-- | src/fec/encode_rs_char.c | 15 | ||||
| -rw-r--r-- | src/fec/fec.h | 30 | ||||
| -rw-r--r-- | src/fec/init_rs.h | 106 | ||||
| -rw-r--r-- | src/fec/init_rs_char.c | 35 | ||||
| -rw-r--r-- | src/fec/rs-common.h | 26 |
13 files changed, 0 insertions, 1453 deletions
diff --git a/src/crc.c b/src/crc.c deleted file mode 100644 index cc02473..0000000 --- a/src/crc.c +++ /dev/null @@ -1,266 +0,0 @@ -/* - Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Her Majesty the - Queen in Right of Canada (Communications Research Center Canada) - */ -/* - This file is part of ODR-DabMux. - - ODR-DabMux is free software: you can redistribute it and/or modify - it under the terms of the GNU General Public License as - published by the Free Software Foundation, either version 3 of the - License, or (at your option) any later version. - - ODR-DabMux is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with ODR-DabMux. If not, see <http://www.gnu.org/licenses/>. - */ - -#include "crc.h" -#ifndef _WIN32 -# include <unistd.h> -# include <netinet/in.h> -#endif -#include <stdio.h> -#include <fcntl.h> - -//#define CCITT 0x1021 - -uint8_t crc8tab[256] = { - 0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15, - 0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d, - 0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65, - 0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d, - 0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5, - 0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd, - 0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85, - 0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd, - 0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2, - 0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea, - 0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2, - 0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a, - 0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32, - 0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a, - 0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42, - 0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a, - 0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c, - 0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4, - 0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec, - 0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4, - 0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c, - 0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44, - 0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c, - 0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34, - 0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b, - 0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63, - 0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b, - 0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13, - 0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb, - 0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83, - 0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb, - 0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3 -}; - - -uint16_t crc16tab[256] = { - 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, - 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, - 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, - 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, - 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, - 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, - 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, - 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, - 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, - 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, - 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, - 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, - 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, - 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, - 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, - 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, - 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, - 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, - 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, - 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, - 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, - 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, - 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, - 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, - 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, - 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, - 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, - 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, - 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, - 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, - 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, - 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 -}; - - -uint32_t crc32tab[256] = { - 0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, - 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005, - 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61, - 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, - 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, - 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75, - 0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, - 0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd, - 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039, - 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, - 0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81, - 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d, - 0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, - 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95, - 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, - 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, - 0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae, - 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072, - 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, - 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, - 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde, - 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, - 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066, - 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba, - 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, - 0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692, - 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6, - 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, - 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e, - 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, - 0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, - 0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a, - 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637, - 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, - 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, - 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53, - 0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, - 0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b, - 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff, - 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, - 0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, - 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b, - 0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, - 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3, - 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, - 0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, - 0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f, - 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3, - 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, - 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, - 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8, - 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, - 0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30, - 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec, - 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, - 0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654, - 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0, - 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, - 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18, - 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, - 0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, - 0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c, - 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668, - 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4 -}; - -// This function can be used to create a new table with a different polynom -void init_crc8tab(uint8_t l_code, uint8_t l_init) -{ - unsigned i, j, msb; - uint8_t nb; - uint8_t crc; - - for (i = 0; i < 256; ++i) { - crc = l_init; - nb = i ^ 0xff; - for (j = 0; j < 8; ++j) { - msb = (nb & (0x80 >> j)) && 1; - msb ^= (crc >> 7); - crc <<= 1; - if (msb) - crc ^= l_code; - } - crc8tab[i] = crc; - } -} - - -void init_crc16tab(uint16_t l_code, uint16_t l_init) -{ - unsigned i, j, msb; - uint8_t nb; - uint16_t crc; - - for (i = 0; i < 256; ++i) { - crc = l_init; - nb = i ^ 0xff; - for (j = 0; j < 8; ++j) { - msb = (nb & (0x80 >> j)) && 1; - msb ^= (crc >> 15); - crc <<= 1; - if (msb) - crc ^= l_code; - } - crc ^= 0xff00; - crc16tab[i] = crc; - } -} - - -void init_crc32tab(uint32_t l_code, uint32_t l_init) -{ - unsigned i, j, msb; - uint8_t nb; - uint32_t crc; - - for (i = 0; i < 256; ++i) { - crc = l_init; - nb = i ^ 0xff; - for (j = 0; j < 8; ++j) { - msb = (nb & (0x80 >> j)) && 1; - msb ^= (crc >> 31); - crc <<= 1; - if (msb) - crc ^= l_code; - } - crc ^= 0xffffff00; - crc32tab[i] = crc; - } -} - - -uint8_t crc8(uint8_t l_crc, const void *lp_data, unsigned l_nb) -{ - const uint8_t* data = (const uint8_t*)lp_data; - while (l_nb--) { - l_crc = crc8tab[l_crc ^ *(data++)]; - } - return (l_crc); -} - - -uint16_t crc16(uint16_t l_crc, const void *lp_data, unsigned l_nb) -{ - const uint8_t* data = (const uint8_t*)lp_data; - while (l_nb--) { - l_crc = - (l_crc << 8) ^ crc16tab[(l_crc >> 8) ^ *(data++)]; - } - return (l_crc); -} - - -uint32_t crc32(uint32_t l_crc, const void *lp_data, unsigned l_nb) -{ - const uint8_t* data = (const uint8_t*)lp_data; - while (l_nb--) { - l_crc = - (l_crc << 8) ^ crc32tab[((l_crc >> 24) ^ *(data++)) & 0xff]; - } - return (l_crc); -} diff --git a/src/crc.h b/src/crc.h deleted file mode 100644 index b1785a1..0000000 --- a/src/crc.h +++ /dev/null @@ -1,59 +0,0 @@ -/* - Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Her Majesty the - Queen in Right of Canada (Communications Research Center Canada) - */ -/* - This file is part of ODR-DabMux. - - ODR-DabMux is free software: you can redistribute it and/or modify - it under the terms of the GNU General Public License as - published by the Free Software Foundation, either version 3 of the - License, or (at your option) any later version. - - ODR-DabMux is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with ODR-DabMux. If not, see <http://www.gnu.org/licenses/>. - */ - -#ifndef _CRC -#define _CRC - -#ifdef HAVE_CONFIG_H -# include "config.h" -#endif - -#ifndef _WIN32 - #include <stdint.h> -#else - #include <winsock2.h> // For types... - typedef BYTE uint8_t; - typedef WORD uint16_t; - typedef DWORD32 uint32_t; -#endif - - -#ifdef __cplusplus -extern "C" { // } -#endif - -void init_crc8tab(uint8_t l_code, uint8_t l_init); -uint8_t crc8(uint8_t l_crc, const void *lp_data, unsigned l_nb); -extern uint8_t crc8tab[]; - -void init_crc16tab(uint16_t l_code, uint16_t l_init); -uint16_t crc16(uint16_t l_crc, const void *lp_data, unsigned l_nb); -extern uint16_t crc16tab[]; - -void init_crc32tab(uint32_t l_code, uint32_t l_init); -uint32_t crc32(uint32_t l_crc, const void *lp_data, unsigned l_nb); -extern uint32_t crc32tab[]; - -#ifdef __cplusplus -} -#endif - -#endif //_CRC diff --git a/src/fec/LICENSE b/src/fec/LICENSE deleted file mode 100644 index 5a883d3..0000000 --- a/src/fec/LICENSE +++ /dev/null @@ -1,502 +0,0 @@ -GNU LESSER GENERAL PUBLIC LICENSE - Version 2.1, February 1999 - - Copyright (C) 1991, 1999 Free Software Foundation, Inc. - 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - Everyone is permitted to copy and distribute verbatim copies - of this license document, but changing it is not allowed. - -(This is the first released version of the Lesser GPL. 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Here is a sample; alter the names: - - Yoyodyne, Inc., hereby disclaims all copyright interest in the - library `Frob' (a library for tweaking knobs) written by James Random Hacker. - - {signature of Ty Coon}, 1 April 1990 - Ty Coon, President of Vice - -That's all there is to it! diff --git a/src/fec/README.md b/src/fec/README.md deleted file mode 100644 index a44d28d..0000000 --- a/src/fec/README.md +++ /dev/null @@ -1,12 +0,0 @@ -FEC routines from KA9Q's libfec -=============================== - -This folder contains part of the libfec library by KA9Q. Only the -char-sized Reed-Solomon encoder and decoder is here. - -The files have been copied from the libfec fork at -https://github.com/Opendigitalradio/ka9q-fec - -Original code is at http://www.ka9q.net/code/fec/ - -All files in this folder are licenced under the LGPL v2.1, please see LICENCE diff --git a/src/fec/char.h b/src/fec/char.h deleted file mode 100644 index 25efd65..0000000 --- a/src/fec/char.h +++ /dev/null @@ -1,24 +0,0 @@ -/* Stuff specific to the 8-bit symbol version of the general purpose RS codecs - * - * Copyright 2003, Phil Karn, KA9Q - * May be used under the terms of the GNU Lesser General Public License (LGPL) - */ -typedef unsigned char data_t; - -#define MODNN(x) modnn(rs,x) - -#define MM (rs->mm) -#define NN (rs->nn) -#define ALPHA_TO (rs->alpha_to) -#define INDEX_OF (rs->index_of) -#define GENPOLY (rs->genpoly) -#define NROOTS (rs->nroots) -#define FCR (rs->fcr) -#define PRIM (rs->prim) -#define IPRIM (rs->iprim) -#define PAD (rs->pad) -#define A0 (NN) - - - - diff --git a/src/fec/decode_rs.h b/src/fec/decode_rs.h deleted file mode 100644 index c165cf3..0000000 --- a/src/fec/decode_rs.h +++ /dev/null @@ -1,298 +0,0 @@ -/* The guts of the Reed-Solomon decoder, meant to be #included - * into a function body with the following typedefs, macros and variables supplied - * according to the code parameters: - - * data_t - a typedef for the data symbol - * data_t data[] - array of NN data and parity symbols to be corrected in place - * retval - an integer lvalue into which the decoder's return code is written - * NROOTS - the number of roots in the RS code generator polynomial, - * which is the same as the number of parity symbols in a block. - Integer variable or literal. - * NN - the total number of symbols in a RS block. Integer variable or literal. - * PAD - the number of pad symbols in a block. Integer variable or literal. - * ALPHA_TO - The address of an array of NN elements to convert Galois field - * elements in index (log) form to polynomial form. Read only. - * INDEX_OF - The address of an array of NN elements to convert Galois field - * elements in polynomial form to index (log) form. Read only. - * MODNN - a function to reduce its argument modulo NN. May be inline or a macro. - * FCR - An integer literal or variable specifying the first consecutive root of the - * Reed-Solomon generator polynomial. Integer variable or literal. - * PRIM - The primitive root of the generator poly. Integer variable or literal. - * DEBUG - If set to 1 or more, do various internal consistency checking. Leave this - * undefined for production code - - * The memset(), memmove(), and memcpy() functions are used. The appropriate header - * file declaring these functions (usually <string.h>) must be included by the calling - * program. - */ - - -#if !defined(NROOTS) -#error "NROOTS not defined" -#endif - -#if !defined(NN) -#error "NN not defined" -#endif - -#if !defined(PAD) -#error "PAD not defined" -#endif - -#if !defined(ALPHA_TO) -#error "ALPHA_TO not defined" -#endif - -#if !defined(INDEX_OF) -#error "INDEX_OF not defined" -#endif - -#if !defined(MODNN) -#error "MODNN not defined" -#endif - -#if !defined(FCR) -#error "FCR not defined" -#endif - -#if !defined(PRIM) -#error "PRIM not defined" -#endif - -#if !defined(NULL) -#define NULL ((void *)0) -#endif - -#undef MIN -#define MIN(a,b) ((a) < (b) ? (a) : (b)) -#undef A0 -#define A0 (NN) - -{ - int deg_lambda, el, deg_omega; - int i, j, r,k; - data_t u,q,tmp,num1,num2,den,discr_r; - data_t lambda[NROOTS+1], s[NROOTS]; /* Err+Eras Locator poly - * and syndrome poly */ - data_t b[NROOTS+1], t[NROOTS+1], omega[NROOTS+1]; - data_t root[NROOTS], reg[NROOTS+1], loc[NROOTS]; - int syn_error, count; - - /* form the syndromes; i.e., evaluate data(x) at roots of g(x) */ - for(i=0;i<NROOTS;i++) - s[i] = data[0]; - - for(j=1;j<NN-PAD;j++){ - for(i=0;i<NROOTS;i++){ - if(s[i] == 0){ - s[i] = data[j]; - } else { - s[i] = data[j] ^ ALPHA_TO[MODNN(INDEX_OF[s[i]] + (FCR+i)*PRIM)]; - } - } - } - - /* Convert syndromes to index form, checking for nonzero condition */ - syn_error = 0; - for(i=0;i<NROOTS;i++){ - syn_error |= s[i]; - s[i] = INDEX_OF[s[i]]; - } - - if (!syn_error) { - /* if syndrome is zero, data[] is a codeword and there are no - * errors to correct. So return data[] unmodified - */ - count = 0; - goto finish; - } - memset(&lambda[1],0,NROOTS*sizeof(lambda[0])); - lambda[0] = 1; - - if (no_eras > 0) { - /* Init lambda to be the erasure locator polynomial */ - lambda[1] = ALPHA_TO[MODNN(PRIM*(NN-1-eras_pos[0]))]; - for (i = 1; i < no_eras; i++) { - u = MODNN(PRIM*(NN-1-eras_pos[i])); - for (j = i+1; j > 0; j--) { - tmp = INDEX_OF[lambda[j - 1]]; - if(tmp != A0) - lambda[j] ^= ALPHA_TO[MODNN(u + tmp)]; - } - } - -#if DEBUG >= 1 - /* Test code that verifies the erasure locator polynomial just constructed - Needed only for decoder debugging. */ - - /* find roots of the erasure location polynomial */ - for(i=1;i<=no_eras;i++) - reg[i] = INDEX_OF[lambda[i]]; - - count = 0; - for (i = 1,k=IPRIM-1; i <= NN; i++,k = MODNN(k+IPRIM)) { - q = 1; - for (j = 1; j <= no_eras; j++) - if (reg[j] != A0) { - reg[j] = MODNN(reg[j] + j); - q ^= ALPHA_TO[reg[j]]; - } - if (q != 0) - continue; - /* store root and error location number indices */ - root[count] = i; - loc[count] = k; - count++; - } - if (count != no_eras) { - printf("count = %d no_eras = %d\n lambda(x) is WRONG\n",count,no_eras); - count = -1; - goto finish; - } -#if DEBUG >= 2 - printf("\n Erasure positions as determined by roots of Eras Loc Poly:\n"); - for (i = 0; i < count; i++) - printf("%d ", loc[i]); - printf("\n"); -#endif -#endif - } - for(i=0;i<NROOTS+1;i++) - b[i] = INDEX_OF[lambda[i]]; - - /* - * Begin Berlekamp-Massey algorithm to determine error+erasure - * locator polynomial - */ - r = no_eras; - el = no_eras; - while (++r <= NROOTS) { /* r is the step number */ - /* Compute discrepancy at the r-th step in poly-form */ - discr_r = 0; - for (i = 0; i < r; i++){ - if ((lambda[i] != 0) && (s[r-i-1] != A0)) { - discr_r ^= ALPHA_TO[MODNN(INDEX_OF[lambda[i]] + s[r-i-1])]; - } - } - discr_r = INDEX_OF[discr_r]; /* Index form */ - if (discr_r == A0) { - /* 2 lines below: B(x) <-- x*B(x) */ - memmove(&b[1],b,NROOTS*sizeof(b[0])); - b[0] = A0; - } else { - /* 7 lines below: T(x) <-- lambda(x) - discr_r*x*b(x) */ - t[0] = lambda[0]; - for (i = 0 ; i < NROOTS; i++) { - if(b[i] != A0) - t[i+1] = lambda[i+1] ^ ALPHA_TO[MODNN(discr_r + b[i])]; - else - t[i+1] = lambda[i+1]; - } - if (2 * el <= r + no_eras - 1) { - el = r + no_eras - el; - /* - * 2 lines below: B(x) <-- inv(discr_r) * - * lambda(x) - */ - for (i = 0; i <= NROOTS; i++) - b[i] = (lambda[i] == 0) ? A0 : MODNN(INDEX_OF[lambda[i]] - discr_r + NN); - } else { - /* 2 lines below: B(x) <-- x*B(x) */ - memmove(&b[1],b,NROOTS*sizeof(b[0])); - b[0] = A0; - } - memcpy(lambda,t,(NROOTS+1)*sizeof(t[0])); - } - } - - /* Convert lambda to index form and compute deg(lambda(x)) */ - deg_lambda = 0; - for(i=0;i<NROOTS+1;i++){ - lambda[i] = INDEX_OF[lambda[i]]; - if(lambda[i] != A0) - deg_lambda = i; - } - /* Find roots of the error+erasure locator polynomial by Chien search */ - memcpy(®[1],&lambda[1],NROOTS*sizeof(reg[0])); - count = 0; /* Number of roots of lambda(x) */ - for (i = 1,k=IPRIM-1; i <= NN; i++,k = MODNN(k+IPRIM)) { - q = 1; /* lambda[0] is always 0 */ - for (j = deg_lambda; j > 0; j--){ - if (reg[j] != A0) { - reg[j] = MODNN(reg[j] + j); - q ^= ALPHA_TO[reg[j]]; - } - } - if (q != 0) - continue; /* Not a root */ - /* store root (index-form) and error location number */ -#if DEBUG>=2 - printf("count %d root %d loc %d\n",count,i,k); -#endif - root[count] = i; - loc[count] = k; - /* If we've already found max possible roots, - * abort the search to save time - */ - if(++count == deg_lambda) - break; - } - if (deg_lambda != count) { - /* - * deg(lambda) unequal to number of roots => uncorrectable - * error detected - */ - count = -1; - goto finish; - } - /* - * Compute err+eras evaluator poly omega(x) = s(x)*lambda(x) (modulo - * x**NROOTS). in index form. Also find deg(omega). - */ - deg_omega = deg_lambda-1; - for (i = 0; i <= deg_omega;i++){ - tmp = 0; - for(j=i;j >= 0; j--){ - if ((s[i - j] != A0) && (lambda[j] != A0)) - tmp ^= ALPHA_TO[MODNN(s[i - j] + lambda[j])]; - } - omega[i] = INDEX_OF[tmp]; - } - - /* - * Compute error values in poly-form. num1 = omega(inv(X(l))), num2 = - * inv(X(l))**(FCR-1) and den = lambda_pr(inv(X(l))) all in poly-form - */ - for (j = count-1; j >=0; j--) { - num1 = 0; - for (i = deg_omega; i >= 0; i--) { - if (omega[i] != A0) - num1 ^= ALPHA_TO[MODNN(omega[i] + i * root[j])]; - } - num2 = ALPHA_TO[MODNN(root[j] * (FCR - 1) + NN)]; - den = 0; - - /* lambda[i+1] for i even is the formal derivative lambda_pr of lambda[i] */ - for (i = MIN(deg_lambda,NROOTS-1) & ~1; i >= 0; i -=2) { - if(lambda[i+1] != A0) - den ^= ALPHA_TO[MODNN(lambda[i+1] + i * root[j])]; - } -#if DEBUG >= 1 - if (den == 0) { - printf("\n ERROR: denominator = 0\n"); - count = -1; - goto finish; - } -#endif - /* Apply error to data */ - if (num1 != 0 && loc[j] >= PAD) { - data[loc[j]-PAD] ^= ALPHA_TO[MODNN(INDEX_OF[num1] + INDEX_OF[num2] + NN - INDEX_OF[den])]; - } - } - finish: - if(eras_pos != NULL){ - for(i=0;i<count;i++) - eras_pos[i] = loc[i]; - } - retval = count; -} diff --git a/src/fec/decode_rs_char.c b/src/fec/decode_rs_char.c deleted file mode 100644 index 7105233..0000000 --- a/src/fec/decode_rs_char.c +++ /dev/null @@ -1,22 +0,0 @@ -/* General purpose Reed-Solomon decoder for 8-bit symbols or less - * Copyright 2003 Phil Karn, KA9Q - * May be used under the terms of the GNU Lesser General Public License (LGPL) - */ - -#ifdef DEBUG -#include <stdio.h> -#endif - -#include <string.h> - -#include "char.h" -#include "rs-common.h" - -int decode_rs_char(void *p, data_t *data, int *eras_pos, int no_eras){ - int retval; - struct rs *rs = (struct rs *)p; - -#include "decode_rs.h" - - return retval; -} diff --git a/src/fec/encode_rs.h b/src/fec/encode_rs.h deleted file mode 100644 index 2c157f9..0000000 --- a/src/fec/encode_rs.h +++ /dev/null @@ -1,58 +0,0 @@ -/* The guts of the Reed-Solomon encoder, meant to be #included - * into a function body with the following typedefs, macros and variables supplied - * according to the code parameters: - - * data_t - a typedef for the data symbol - * data_t data[] - array of NN-NROOTS-PAD and type data_t to be encoded - * data_t parity[] - an array of NROOTS and type data_t to be written with parity symbols - * NROOTS - the number of roots in the RS code generator polynomial, - * which is the same as the number of parity symbols in a block. - Integer variable or literal. - * - * NN - the total number of symbols in a RS block. Integer variable or literal. - * PAD - the number of pad symbols in a block. Integer variable or literal. - * ALPHA_TO - The address of an array of NN elements to convert Galois field - * elements in index (log) form to polynomial form. Read only. - * INDEX_OF - The address of an array of NN elements to convert Galois field - * elements in polynomial form to index (log) form. Read only. - * MODNN - a function to reduce its argument modulo NN. May be inline or a macro. - * GENPOLY - an array of NROOTS+1 elements containing the generator polynomial in index form - - * The memset() and memmove() functions are used. The appropriate header - * file declaring these functions (usually <string.h>) must be included by the calling - * program. - - * Copyright 2004, Phil Karn, KA9Q - * May be used under the terms of the GNU Lesser General Public License (LGPL) - */ - - -#undef A0 -#define A0 (NN) /* Special reserved value encoding zero in index form */ - -{ - int i, j; - data_t feedback; - - memset(parity,0,NROOTS*sizeof(data_t)); - - for(i=0;i<NN-NROOTS-PAD;i++){ - feedback = INDEX_OF[data[i] ^ parity[0]]; - if(feedback != A0){ /* feedback term is non-zero */ -#ifdef UNNORMALIZED - /* This line is unnecessary when GENPOLY[NROOTS] is unity, as it must - * always be for the polynomials constructed by init_rs() - */ - feedback = MODNN(NN - GENPOLY[NROOTS] + feedback); -#endif - for(j=1;j<NROOTS;j++) - parity[j] ^= ALPHA_TO[MODNN(feedback + GENPOLY[NROOTS-j])]; - } - /* Shift */ - memmove(&parity[0],&parity[1],sizeof(data_t)*(NROOTS-1)); - if(feedback != A0) - parity[NROOTS-1] = ALPHA_TO[MODNN(feedback + GENPOLY[0])]; - else - parity[NROOTS-1] = 0; - } -} diff --git a/src/fec/encode_rs_char.c b/src/fec/encode_rs_char.c deleted file mode 100644 index a9bf2b8..0000000 --- a/src/fec/encode_rs_char.c +++ /dev/null @@ -1,15 +0,0 @@ -/* Reed-Solomon encoder - * Copyright 2002, Phil Karn, KA9Q - * May be used under the terms of the GNU Lesser General Public License (LGPL) - */ -#include <string.h> - -#include "char.h" -#include "rs-common.h" - -void encode_rs_char(void *p,data_t *data, data_t *parity){ - struct rs *rs = (struct rs *)p; - -#include "encode_rs.h" - -} diff --git a/src/fec/fec.h b/src/fec/fec.h deleted file mode 100644 index 0d1bae1..0000000 --- a/src/fec/fec.h +++ /dev/null @@ -1,30 +0,0 @@ -/* Main header for reduced libfec. - * - * The FEC code in this folder is - * Copyright 2003 Phil Karn, KA9Q - * May be used under the terms of the GNU Lesser General Public License (LGPL) - */ - -#pragma once - -#include <stdlib.h> - -#include "char.h" -#include "rs-common.h" - -/* Initialize a Reed-Solomon codec - * symsize = symbol size, bits - * gfpoly = Field generator polynomial coefficients - * fcr = first root of RS code generator polynomial, index form - * prim = primitive element to generate polynomial roots - * nroots = RS code generator polynomial degree (number of roots) - * pad = padding bytes at front of shortened block - */ -void *init_rs_char(int symsize,int gfpoly,int fcr,int prim,int nroots,int pad); - -int decode_rs_char(void *p, data_t *data, int *eras_pos, int no_eras); - -void encode_rs_char(void *p,data_t *data, data_t *parity); - -void free_rs_char(void *p); - diff --git a/src/fec/init_rs.h b/src/fec/init_rs.h deleted file mode 100644 index 2b2ae98..0000000 --- a/src/fec/init_rs.h +++ /dev/null @@ -1,106 +0,0 @@ -/* Common code for intializing a Reed-Solomon control block (char or int symbols) - * Copyright 2004 Phil Karn, KA9Q - * May be used under the terms of the GNU Lesser General Public License (LGPL) - */ -#undef NULL -#define NULL ((void *)0) - -{ - int i, j, sr,root,iprim; - - rs = NULL; - /* Check parameter ranges */ - if(symsize < 0 || symsize > 8*sizeof(data_t)){ - goto done; - } - - if(fcr < 0 || fcr >= (1<<symsize)) - goto done; - if(prim <= 0 || prim >= (1<<symsize)) - goto done; - if(nroots < 0 || nroots >= (1<<symsize)) - goto done; /* Can't have more roots than symbol values! */ - if(pad < 0 || pad >= ((1<<symsize) -1 - nroots)) - goto done; /* Too much padding */ - - rs = (struct rs *)calloc(1,sizeof(struct rs)); - if(rs == NULL) - goto done; - - rs->mm = symsize; - rs->nn = (1<<symsize)-1; - rs->pad = pad; - - rs->alpha_to = (data_t *)malloc(sizeof(data_t)*(rs->nn+1)); - if(rs->alpha_to == NULL){ - free(rs); - rs = NULL; - goto done; - } - rs->index_of = (data_t *)malloc(sizeof(data_t)*(rs->nn+1)); - if(rs->index_of == NULL){ - free(rs->alpha_to); - free(rs); - rs = NULL; - goto done; - } - - /* Generate Galois field lookup tables */ - rs->index_of[0] = A0; /* log(zero) = -inf */ - rs->alpha_to[A0] = 0; /* alpha**-inf = 0 */ - sr = 1; - for(i=0;i<rs->nn;i++){ - rs->index_of[sr] = i; - rs->alpha_to[i] = sr; - sr <<= 1; - if(sr & (1<<symsize)) - sr ^= gfpoly; - sr &= rs->nn; - } - if(sr != 1){ - /* field generator polynomial is not primitive! */ - free(rs->alpha_to); - free(rs->index_of); - free(rs); - rs = NULL; - goto done; - } - - /* Form RS code generator polynomial from its roots */ - rs->genpoly = (data_t *)malloc(sizeof(data_t)*(nroots+1)); - if(rs->genpoly == NULL){ - free(rs->alpha_to); - free(rs->index_of); - free(rs); - rs = NULL; - goto done; - } - rs->fcr = fcr; - rs->prim = prim; - rs->nroots = nroots; - - /* Find prim-th root of 1, used in decoding */ - for(iprim=1;(iprim % prim) != 0;iprim += rs->nn) - ; - rs->iprim = iprim / prim; - - rs->genpoly[0] = 1; - for (i = 0,root=fcr*prim; i < nroots; i++,root += prim) { - rs->genpoly[i+1] = 1; - - /* Multiply rs->genpoly[] by @**(root + x) */ - for (j = i; j > 0; j--){ - if (rs->genpoly[j] != 0) - rs->genpoly[j] = rs->genpoly[j-1] ^ rs->alpha_to[modnn(rs,rs->index_of[rs->genpoly[j]] + root)]; - else - rs->genpoly[j] = rs->genpoly[j-1]; - } - /* rs->genpoly[0] can never be zero */ - rs->genpoly[0] = rs->alpha_to[modnn(rs,rs->index_of[rs->genpoly[0]] + root)]; - } - /* convert rs->genpoly[] to index form for quicker encoding */ - for (i = 0; i <= nroots; i++) - rs->genpoly[i] = rs->index_of[rs->genpoly[i]]; - done:; - -} diff --git a/src/fec/init_rs_char.c b/src/fec/init_rs_char.c deleted file mode 100644 index a51099a..0000000 --- a/src/fec/init_rs_char.c +++ /dev/null @@ -1,35 +0,0 @@ -/* Initialize a RS codec - * - * Copyright 2002 Phil Karn, KA9Q - * May be used under the terms of the GNU Lesser General Public License (LGPL) - */ -#include <stdlib.h> - -#include "char.h" -#include "rs-common.h" - -void free_rs_char(void *p){ - struct rs *rs = (struct rs *)p; - - free(rs->alpha_to); - free(rs->index_of); - free(rs->genpoly); - free(rs); -} - -/* Initialize a Reed-Solomon codec - * symsize = symbol size, bits - * gfpoly = Field generator polynomial coefficients - * fcr = first root of RS code generator polynomial, index form - * prim = primitive element to generate polynomial roots - * nroots = RS code generator polynomial degree (number of roots) - * pad = padding bytes at front of shortened block - */ -void *init_rs_char(int symsize,int gfpoly,int fcr,int prim, - int nroots,int pad){ - struct rs *rs; - -#include "init_rs.h" - - return rs; -} diff --git a/src/fec/rs-common.h b/src/fec/rs-common.h deleted file mode 100644 index e64eb39..0000000 --- a/src/fec/rs-common.h +++ /dev/null @@ -1,26 +0,0 @@ -/* Stuff common to all the general-purpose Reed-Solomon codecs - * Copyright 2004 Phil Karn, KA9Q - * May be used under the terms of the GNU Lesser General Public License (LGPL) - */ - -/* Reed-Solomon codec control block */ -struct rs { - int mm; /* Bits per symbol */ - int nn; /* Symbols per block (= (1<<mm)-1) */ - data_t *alpha_to; /* log lookup table */ - data_t *index_of; /* Antilog lookup table */ - data_t *genpoly; /* Generator polynomial */ - int nroots; /* Number of generator roots = number of parity symbols */ - int fcr; /* First consecutive root, index form */ - int prim; /* Primitive element, index form */ - int iprim; /* prim-th root of 1, index form */ - int pad; /* Padding bytes in shortened block */ -}; - -static inline int modnn(struct rs *rs,int x){ - while (x >= rs->nn) { - x -= rs->nn; - x = (x >> rs->mm) + (x & rs->nn); - } - return x; -} |