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disk2chain.c

Go to the documentation of this file.

#include <stdlib.h>
#include "sadie.h"
#include "chain.h"


void DISK2CHAIN (
char *filename,              /* Filename for reading chain code */
CHAIN **chainmap             /* Address of pointer to chain structure */
) {
    unsigned int *startCoord;
    unsigned char *code_valid;
    LIST_NODE *newLnode, **prevLnode;
    CHAIN_NODE *newCnode, **prevCnode;
    FILE *fp;

    fp = fopen(filename, "r");
    if (fp == NULL) {
        MESSAGE('E'," Can't open chain code file.");
        goto the_end;
    }

    /* Allocate memory for chain structure */
    (*chainmap) = (CHAIN *)malloc(sizeof(CHAIN));
    startCoord = (unsigned int *)calloc(2, sizeof(unsigned int));
    code_valid = (unsigned char *)calloc(2, sizeof(unsigned char));
    
    /* Read header from file */
    fread((char *)&((*chainmap)->nlin), CHAIN_HEADER_SIZE, 1, fp);
    (*chainmap)->list = NULL;
    prevLnode = (LIST_NODE **)&((*chainmap)->list);

    /* Read chain code from file into chain structure */
    while (fread(startCoord, sizeof(unsigned int), 2, fp) == 2) {
        newLnode = (LIST_NODE *)malloc(sizeof(LIST_NODE));
        newLnode->startj = startCoord[0];
        newLnode->startk = startCoord[1];
        fread((char *)&(newLnode->ring_type), sizeof(unsigned char), 1, fp);
        fread((char *)&(newLnode->ring_id), sizeof(int), 1, fp);
        newLnode->chain = NULL;
        newLnode->next = NULL;
        (*prevLnode) = newLnode;
        prevLnode = (LIST_NODE **)&(newLnode->next);
        prevCnode = (CHAIN_NODE **)&(newLnode->chain);
        fread(code_valid, sizeof(unsigned char), 2, fp);
        while (code_valid[0] != TERM_CODE) {
            newCnode = (CHAIN_NODE *)malloc(sizeof(CHAIN_NODE));
            newCnode->code = code_valid[0];
            newCnode->valid = code_valid[1];
            newCnode->next = NULL;
            (*prevCnode) = newCnode;
            prevCnode = (CHAIN_NODE **)&(newCnode->next);
            fread(code_valid, sizeof(unsigned char), 2, fp);
        }
    }
    fclose(fp);
    
 the_end:
}

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