#include "lzw.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int decompress(char* filename)
{
    char* outfilename;
    FILE *fp, *outfp;
    int i;
    unsigned int ifnlen, ofnlen;

    fp = fopen(filename, "rb");
    if (fp == NULL) {
        perror("fopen()");
        return -1;
    }

    /* NOLINTBEGIN(clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling) */
    ifnlen = strlen(filename);
    ofnlen = ifnlen + 5;
    outfilename = (char*)malloc(ofnlen);
    strncpy(outfilename, filename, ofnlen);
    for (i = ifnlen - 1; i > 0 && outfilename[i] != '/'; i--)
        if (outfilename[i] == '.') {
            outfilename[i] = '\0';
            break;
        }
    if (strcmp(filename, outfilename) == 0)
        strncat(outfilename, ".out", ofnlen);
    /* NOLINTEND(clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling) */

    printf("Writing to %s\n", outfilename);
    outfp = fopen(outfilename, "wb");
    if (outfp == NULL) {
        perror("fopen()");
        free(outfilename);
        return -1;
    }

    lzw_decompress_file(fp, outfp);
    free(outfilename);
    fclose(outfp);
    fclose(fp);

    return 0;
}

int main(int argc, char* argv[])
{
    int i;

    for (i = 1; i < argc; i++) {
        printf("Decompressing %s\n", argv[i]);
        decompress(argv[i]);
    }

    return EXIT_SUCCESS;
}