zsplit/zsplit.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>

const char *get_packet_name(const char *filename, int num)
{
    static char buf[256] = {0};
    sprintf(buf, "%s.%d", filename, num);
    return buf;
}

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

    //打开输入文件

    int fd = open(argv[1], O_RDONLY);
    if (fd < 0)
    {
        perror("openfail");
        exit(-1);
    }

    int fileindex = 1;
    uint32_t sumcheck = 0;
    uint8_t *data = malloc(100 * 1024 * 1024);
    if (data == NULL)
    {
        perror("malloc fail");
        exit(-1);
    }

    while (1)
    {

        int readlen = read(fd, data, 100 * 1024 * 1024);
        if (readlen <= 0)
        {
            printf("write end\n");
            break;
        }

        for (size_t i = 0; i < readlen; i++)
        {
            sumcheck += data[i];
        }

        //
        printf("create %s(%d)\n", get_packet_name(argv[1], fileindex), readlen);
        int tofd = open(get_packet_name(argv[1], fileindex), O_TRUNC | O_RDWR | O_CREAT,666);
        int writenum = write(tofd, data, readlen);
        if (writenum != readlen)
        {
            printf("Error: write fail,writenum!=readlen,%d != %d\n", writenum, readlen);
            exit(0);
        }
        close(tofd);
        fileindex++;
    }
    printf("sumcheck %d\n", sumcheck);

    return 0;
}