onefile.c

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#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
 
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
 
int main(int argc, char** argv)
{
    FILE * fp;
    uint8_t *Data;
    size_t Size;
 
    if (argc != 2) {
        return 1;
    }
    //opens the file, get its size, and reads it into a buffer
    fp = fopen(argv[1], "rb");
    if (fp == NULL) {
        return 2;
    }
    if (fseek(fp, 0L, SEEK_END) != 0) {
        fclose(fp);
        return 2;
    }
    Size = ftell(fp);
    if (Size == (size_t) -1) {
        fclose(fp);
        return 2;
    }
    if (fseek(fp, 0L, SEEK_SET) != 0) {
        fclose(fp);
        return 2;
    }
    Data = malloc(Size);
    if (Data == NULL) {
        fclose(fp);
        return 2;
    }
    if (fread(Data, Size, 1, fp) != 1) {
        fclose(fp);
        free(Data);
        return 2;
    }
 
    //lauch fuzzer
    LLVMFuzzerTestOneInput(Data, Size);
    free(Data);
    fclose(fp);
    return 0;
}