fastpos_tablegen.c File Reference

Generates the lzma_fastpos[] lookup table. More...

#include <inttypes.h>
#include <stdio.h>
#include "fastpos.h"

Go to the source code of this file.

Functions
int	main (void)

Detailed Description

Generates the lzma_fastpos[] lookup table.

Definition in file fastpos_tablegen.c.

Function Documentation

main()

int main

(

void

)

Definition at line 20 of file fastpos_tablegen.c.

{
    uint8_t fastpos[1 << FASTPOS_BITS];
 
    const uint8_t fast_slots = 2 * FASTPOS_BITS;
    uint32_t c = 2;
 
    fastpos[0] = 0;
    fastpos[1] = 1;
 
    for (uint8_t slot_fast = 2; slot_fast < fast_slots; ++slot_fast) {
        const uint32_t k = 1 << ((slot_fast >> 1) - 1);
        for (uint32_t j = 0; j < k; ++j, ++c)
            fastpos[c] = slot_fast;
    }
 
    printf("/* This file has been automatically generated "
            "by fastpos_tablegen.c. */\n\n"
            "#include \"common.h\"\n"
            "#include \"fastpos.h\"\n\n"
            "const uint8_t lzma_fastpos[1 << FASTPOS_BITS] = {");
 
    for (size_t i = 0; i < (1 << FASTPOS_BITS); ++i) {
        if (i % 16 == 0)
            printf("\n\t");
 
        printf("%3u", (unsigned int)(fastpos[i]));
 
        if (i != (1 << FASTPOS_BITS) - 1)
            printf(",");
    }
 
    printf("\n};\n");
 
    return 0;
}

References c, FASTPOS_BITS, i, k, and printf().