crc32_tablegen.c File Reference

Generate crc32_table_le.h and crc32_table_be.h. More...

#include <stdio.h>
#include "../../common/tuklib_integer.h"

Go to the source code of this file.

Functions
static void	init_crc32_table (void)
static void	print_crc32_table (void)
static void	print_lz_table (void)
int	main (void)

Variables
static uint32_t	crc32_table [8][256]

Detailed Description

Generate crc32_table_le.h and crc32_table_be.h.

Compiling: gcc -std=c99 -o crc32_tablegen crc32_tablegen.c Add -DWORDS_BIGENDIAN to generate big endian table. Add -DLZ_HASH_TABLE to generate lz_encoder_hash_table.h (little endian).

Definition in file crc32_tablegen.c.

Function Documentation

init_crc32_table()

static void init_crc32_table ( void  )

static

Definition at line 25 of file crc32_tablegen.c.

{
    static const uint32_t poly32 = UINT32_C(0xEDB88320);
 
    for (size_t s = 0; s < 8; ++s) {
        for (size_t b = 0; b < 256; ++b) {
            uint32_t r = s == 0 ? b : crc32_table[s - 1][b];
 
            for (size_t i = 0; i < 8; ++i) {
                if (r & 1)
                    r = (r >> 1) ^ poly32;
                else
                    r >>= 1;
            }
 
            crc32_table[s][b] = r;
        }
    }
 
#ifdef WORDS_BIGENDIAN
    for (size_t s = 0; s < 8; ++s)
        for (size_t b = 0; b < 256; ++b)
            crc32_table[s][b] = bswap32(crc32_table[s][b]);
#endif
 
    return;
}

References b, bswap32, crc32_table, i, r, s, and UINT32_C.

Referenced by main().

main()

int main

(

void

)

Definition at line 106 of file crc32_tablegen.c.

{
    init_crc32_table();
 
#ifdef LZ_HASH_TABLE
    print_lz_table();
#else
    print_crc32_table();
#endif
 
    return 0;
}

References init_crc32_table(), print_crc32_table(), and print_lz_table().

print_crc32_table()

static void print_crc32_table ( void  )

static

Definition at line 55 of file crc32_tablegen.c.

{
    printf("/* This file has been automatically generated by "
            "crc32_tablegen.c. */\n\n"
            "const uint32_t lzma_crc32_table[8][256] = {\n\t{");
 
    for (size_t s = 0; s < 8; ++s) {
        for (size_t b = 0; b < 256; ++b) {
            if ((b % 4) == 0)
                printf("\n\t\t");
 
            printf("0x%08" PRIX32, crc32_table[s][b]);
 
            if (b != 255)
                printf(",%s", (b+1) % 4 == 0 ? "" : " ");
        }
 
        if (s == 7)
            printf("\n\t}\n};\n");
        else
            printf("\n\t}, {");
    }
 
    return;
}

References b, crc32_table, printf(), PRIX32, and s.

Referenced by main().

print_lz_table()

static void print_lz_table ( void  )

static

Definition at line 83 of file crc32_tablegen.c.

{
    printf("/* This file has been automatically generated by "
            "crc32_tablegen.c. */\n\n"
            "const uint32_t lzma_lz_hash_table[256] = {");
 
    for (size_t b = 0; b < 256; ++b) {
        if ((b % 4) == 0)
            printf("\n\t");
 
        printf("0x%08" PRIX32, crc32_table[0][b]);
 
        if (b != 255)
            printf(",%s", (b+1) % 4 == 0 ? "" : " ");
    }
 
    printf("\n};\n");
 
    return;
}

References b, crc32_table, printf(), and PRIX32.

Referenced by main().

Variable Documentation

crc32_table

uint32_t crc32_table[8][256]

static

Definition at line 21 of file crc32_tablegen.c.

Referenced by init_crc32_table(), print_crc32_table(), and print_lz_table().