CODEWITHSUNDEEP
cwindows
cryptoTuke
cryptoTuke

Reputation: 53

Loading big file in c

This is my program code that can load inputs 1GB, 2GB, but I would need to load files larger than 2GB. I work at Windows.

#include <stdio.h>
#include <stdlib.h>

int main() {
    FILE *stream;
    size_t size;
    int fileSize = 0;
    char *input;

    // Open file, find the size of it
    stream = fopen("3GB.bin", "rb");
    fseek(stream, 0L, SEEK_END);
    fileSize = ftell(stream);
    fseek(stream, 0L, SEEK_SET);

    input = (char *)malloc(fileSize + 1);

    // Stream file into memory
    size = fread(input, 1, fileSize, stream);
    input[size] = 0;
    fclose(stream);

    printf("size file is: %d\n", fileSize);

    free(input);

    return 0;
}

The problem is that it does not load files larger than 2GB at all... Don't know where the problem is?

Upvotes: 1

Views: 347

Answers (1)

cryptoTuke
cryptoTuke

Reputation: 53

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


int main()
{
    FILE *stream;
    size_t size;
    uint32_t fileSize = 0;
    char *input;
    int result1, result2;

    // Open file, find the size of it
    stream = fopen("4GB.bin", "rb");
    if (result1 = _fseeki64(stream, 0L, SEEK_END) != 0)
    {
        printf("_fseeki64 result1 error\n");
    }
    fileSize = _ftelli64(stream);

    if (result2 = _fseeki64(stream, 0L, SEEK_SET)!= 0)
    {
        printf("_fseeki64 result2 error\n");
    }

    input = (char *) malloc(fileSize + 1);

    if (input == NULL) {
        printf("Memory not allocated.\n");
        exit(0);
    }


    //Stream file into memory
    size = fread(input, 1, fileSize, stream);
    input[size] = 0;
    fclose(stream);

    printf("size file is: %u\n", fileSize);

    free(input);

    return 0;

}

Upvotes: 2

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