clean compress

[compress.git] / code.c

#include "debug.h"
#include "fdprintf.h"

#include "code.h"

/* constants */

#define NB_LEAFS ((NB_BYTES + 1) * NB_BYTES / 2)

/* concatenate code */

int codcat (char *dst, int n, char *src)
{
    while ((*dst != 0) && (n > 0)) {
        n--;
        dst++;
    }

    return (n > 0) ? codcpy (dst, n, src) : -1;
}

/* compare 2 codes */

int codcmp (char *cod1, char *cod2)
{
    int i = -1;

    do {
        i++;
        if (cod1[i] != cod2[i]) {
            return (cod1[i] < cod2[i]) ? -1 : 1;
        }
    } while (cod1[i] != 0);

    return 0;
}

/* copy code */

int codcpy (char *dst, int n, char *src)
{
    int i;

    for (i = 0; i < n; i++) {
        dst[i] = src[i];
        if (src[i]== 0) {
            return i;
        }
    }
    VERBOSE (ERROR, PRINTERR ("Buffer too short\n"));

    return -1;
}

/* code length */

int codlen (char *code)
{
    int i = 0;

    while (code[i] != 0) {
        i++;
    }

    return i;
}

/* get leaf(s) */

leaf_t *getleaf (int n)
{
    static leaf_t leafs[NB_LEAFS] = {0};
    static int pos = 0;
    leaf_t *pt = (void *)0;

    if (pos + n < NB_LEAFS) {
        pt = leafs + pos;
        pos += n;
    } else {
        VERBOSE (ERROR, PRINTERR ("No more leaf avaliable\n"));
    }

    return pt;
}

/* vim: set ts=4 sw=4 et: */