在小端系统中读取大端文件

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

// 假设我们要读取一个32位的大端整数
uint32_t read_big_endian_file(const char *filename) {
    FILE *file = fopen(filename, "rb");
    if (!file) {
        perror("Failed to open file");
        return 0;
    }

    uint32_t value;
    fread(&value, sizeof(value), 1, file);
    fclose(file);

    // 进行字节序转换
    value = ((value & 0xFF) << 24) |
            ((value & 0xFF00) << 8) |
            ((value & 0xFF0000) >> 8) |
            ((value & 0xFF000000) >> 24);

    return value;
}

int main() {
    uint32_t value = read_big_endian_file("big_endian_file.bin");
    printf("Converted value: 0x%X\n", value);
    return 0;
}