fastpos_tablegen.c revision 207753
1/////////////////////////////////////////////////////////////////////////////// 2// 3/// \file fastpos_tablegen.c 4/// \brief Generates the lzma_fastpos[] lookup table 5/// 6// Authors: Igor Pavlov 7// Lasse Collin 8// 9// This file has been put into the public domain. 10// You can do whatever you want with this file. 11// 12/////////////////////////////////////////////////////////////////////////////// 13 14#include <sys/types.h> 15#include <inttypes.h> 16#include <stdio.h> 17#include "fastpos.h" 18 19 20int 21main(void) 22{ 23 uint8_t fastpos[1 << FASTPOS_BITS]; 24 25 const uint8_t fast_slots = 2 * FASTPOS_BITS; 26 uint32_t c = 2; 27 28 fastpos[0] = 0; 29 fastpos[1] = 1; 30 31 for (uint8_t slot_fast = 2; slot_fast < fast_slots; ++slot_fast) { 32 const uint32_t k = 1 << ((slot_fast >> 1) - 1); 33 for (uint32_t j = 0; j < k; ++j, ++c) 34 fastpos[c] = slot_fast; 35 } 36 37 printf("/* This file has been automatically generated " 38 "by fastpos_tablegen.c. */\n\n" 39 "#include \"common.h\"\n" 40 "#include \"fastpos.h\"\n\n" 41 "const uint8_t lzma_fastpos[1 << FASTPOS_BITS] = {"); 42 43 for (size_t i = 0; i < (1 << FASTPOS_BITS); ++i) { 44 if (i % 16 == 0) 45 printf("\n\t"); 46 47 printf("%3u", (unsigned int)(fastpos[i])); 48 49 if (i != (1 << FASTPOS_BITS) - 1) 50 printf(","); 51 } 52 53 printf("\n};\n"); 54 55 return 0; 56} 57