#include <stdio.h>
#include <stdlib.h>
void main(void) {
    unsigned char buffer[32768], filename[]="DIVIDED.???", source[256];
    unsigned int size, a, i, type;
    FILE *fin, *fout;
    printf("分割元のファイル名：");
    scanf("%s", source);
    if ((fin = fopen(source, "rb")) == NULL) {
        printf("エラー　%s をオープンできません。\n", source);
        return;
    }
    fseek(fin, 0, SEEK_END);
    printf("%s のファイルサイズは %lu バイトです。\n", source, ftell(fin));
    fseek(fin, 0, SEEK_SET);
    do {
        printf("分割するサイズを選んでください。1:128KB, 2:1.2MB, 3:1.44MB  ");
        scanf("%d", &type);
    } while (type < 1 || type > 3);
    a = 0;
    while (1) {
        if (feof(fin)) break;
        filename[8] = (a / 100) + '0';
        filename[9] = ((a % 100) / 10) + '0';
        filename[10] = (a % 10) + '0';
        printf("Writing %s\n", filename);
        if ((fout = fopen(filename, "wb")) == NULL) {
            printf("Error. Unable to create %s\n", filename);
            fclose (fin);
            return;
        }
        if (type == 1) {
            for (i = 1; i <= 4; i++) {
                size = fread(buffer, 1, (unsigned int) 32768, fin);
                fwrite(buffer, 1, size, fout);
            }
        } else if (type == 2) {
            for (i = 1; i <= 38; i++) {
                size = fread(buffer, 1, (unsigned int) 32768, fin);
                fwrite(buffer, 1, size, fout);
            }
            size = fread(buffer, 1, 5120, fin);
            fwrite(buffer, 1, size, fout);
        } else {
            for (i = 1; i <= 44; i++) {
                size = fread(buffer, 1, (unsigned int) 32768, fin);
                fwrite(buffer, 1, size, fout);
            }
            size = fread(buffer, 1, 15872, fin);
            fwrite(buffer, 1, size, fout);
        }
        fclose (fout);
        a++;
    }
    fclose (fin);
}