libparasail-sys 0.2.1

Unsafe Rust bindings for the parasail C library
Documentation 
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/**
 * @file
 *
 * @author jeffrey.daily@gmail.com
 *
 * Copyright (c) 2015 Battelle Memorial Institute.
 */
#include "config.h"

#include <stdint.h>
#include <stdlib.h>

#include "parasail.h"
#include "parasail/memory.h"

#define NEG_INF_32 (INT32_MIN/2)
#define MAX(a,b) ((a)>(b)?(a):(b))

#define ENAME parasail_nw_trace

parasail_result_t* ENAME(
        const char * const restrict _s1, const int _s1Len,
        const char * const restrict _s2, const int s2Len,
        const int open, const int gap, const parasail_matrix_t *matrix)
{
    /* declare local variables */
    parasail_result_t *result = NULL;
    int * restrict s1 = NULL;
    int * restrict s2 = NULL;
    int * restrict H = NULL;
    int * restrict F = NULL;
    int8_t * restrict HT = NULL;
    int i = 0;
    int j = 0;
    int s1Len = 0;

    /* validate inputs */
    PARASAIL_CHECK_NULL(_s2);
    PARASAIL_CHECK_GT0(s2Len);
    PARASAIL_CHECK_GE0(open);
    PARASAIL_CHECK_GE0(gap);
    PARASAIL_CHECK_NULL(matrix);
    if (matrix->type == PARASAIL_MATRIX_TYPE_SQUARE) {
        PARASAIL_CHECK_NULL(_s1);
        PARASAIL_CHECK_GT0(_s1Len);
    }

    /* initialize stack variables */
    s1Len = matrix->type == PARASAIL_MATRIX_TYPE_SQUARE ? _s1Len : matrix->length;

    /* initialize result */
    result = parasail_result_new_trace(s1Len, s2Len, 16, sizeof(int8_t));
    if (!result) return NULL;

    /* set known flags */
    result->flag |= PARASAIL_FLAG_NW | PARASAIL_FLAG_NOVEC | PARASAIL_FLAG_TRACE
        | PARASAIL_FLAG_BITS_INT | PARASAIL_FLAG_LANES_1;

    /* initialize heap variables */
    s2 = parasail_memalign_int(16, s2Len);
    H = parasail_memalign_int(16, s2Len+1);
    F = parasail_memalign_int(16, s2Len+1);
    HT = (int8_t* const restrict)result->trace->trace_table;

    /* validate heap variables */
    if (!s2) return NULL;
    if (!H) return NULL;
    if (!F) return NULL;

    if (matrix->type == PARASAIL_MATRIX_TYPE_SQUARE) {
        s1 = parasail_memalign_int(16, s1Len);
        if (!s1) return NULL;
        for (i=0; i<s1Len; ++i) {
            s1[i] = matrix->mapper[(unsigned char)_s1[i]];
        }
    }
    for (j=0; j<s2Len; ++j) {
        s2[j] = matrix->mapper[(unsigned char)_s2[j]];
    }

    /* upper left corner */
    H[0] = 0;
    F[0] = NEG_INF_32;
    
    /* first row */
    for (j=1; j<=s2Len; ++j) {
        H[j] = -open -(j-1)*gap;
        F[j] = NEG_INF_32;
    }

    /* iter over first sequence */
    for (i=1; i<=s1Len; ++i) {
        const int * const restrict matrow =
            matrix->type == PARASAIL_MATRIX_TYPE_SQUARE ?
            &matrix->matrix[matrix->size*s1[i-1]] :
            &matrix->matrix[matrix->size*(i-1)];
        /* init first column */
        int NH = H[0];
        int WH = -open - (i-1)*gap;
        int E = NEG_INF_32;
        H[0] = WH;
        for (j=1; j<=s2Len; ++j) {
            int H_dag;
            int E_opn;
            int E_ext;
            int F_opn;
            int F_ext;
            int NWH = NH;
            NH = H[j];
            F_opn = NH - open;
            F_ext = F[j] - gap;
            F[j] = MAX(F_opn, F_ext);
            E_opn = WH - open;
            E_ext = E    - gap;
            E    = MAX(E_opn, E_ext);
            H_dag = NWH + matrow[s2[j-1]];
            WH = MAX(H_dag, E);
            WH = MAX(WH, F[j]);
            H[j] = WH;
            HT[1LL*(i-1)*s2Len + (j-1)] = (F_opn > F_ext) ? PARASAIL_DIAG_F
                                                          : PARASAIL_DEL_F;
            HT[1LL*(i-1)*s2Len + (j-1)] |= (E_opn > E_ext) ? PARASAIL_DIAG_E
                                                           : PARASAIL_INS_E;
            HT[1LL*(i-1)*s2Len + (j-1)] |= (WH == H_dag) ? PARASAIL_DIAG
                                        : (WH == F[j])   ? PARASAIL_DEL
                                                         : PARASAIL_INS;
        }
    }

    result->score = H[s2Len];
    result->end_query = s1Len-1;
    result->end_ref = s2Len-1;

    parasail_free(F);
    parasail_free(H);
    parasail_free(s2);
    if (matrix->type == PARASAIL_MATRIX_TYPE_SQUARE) {
        parasail_free(s1);
    }

    return result;
}