linux scsi命令读取文件

SCSI Read(10)是一种用于从SCSI设备读取数据的命令。下面是一个简单的示例代码，演示如何使用SCSI Read(10)命令来读取指定大小的文件：

#include 
#include 
#include 

#define READ_CAPACITY_CMD    0x25
#define READ_10_CMD          0x28

#define DATA_BUFFER_SIZE     4096

void scsi_read(FILE* scsi_device, unsigned long long start_sector, unsigned int block_size, unsigned int num_blocks)
{
    unsigned char read_buffer[DATA_BUFFER_SIZE];
    unsigned char read_cmd[10] = {
        READ_10_CMD,
        0x00,
        (start_sector >> 24) & 0xFF,
        (start_sector >> 16) & 0xFF,
        (start_sector >> 8) & 0xFF,
        start_sector & 0xFF,
        0x00,
        (num_blocks >> 8) & 0xFF,
        num_blocks & 0xFF,
        0x00
    };

    memset(read_buffer, 0, sizeof(read_buffer));

    fseek(scsi_device, 0, SEEK_SET);  // 将文件指针移到开始位置

    // 发送SCSI命令
    fwrite(read_cmd, 1, sizeof(read_cmd), scsi_device);
    fflush(scsi_device);

    // 读取数据
    fread(read_buffer, block_size, num_blocks, scsi_device);

    // 可以在这里对读取到的数据进行处理或保存

    // 打印读取到的内容（仅用于示例）
    printf("Read Data:\n");
    for (int i = 0; i < num_blocks * block_size; i++)
    {
        printf("%02X ", read_buffer[i]);
        if ((i + 1) % block_size == 0)
            printf("\n");
    }
}

int main()
{
    // 打开SCSI设备文件（假设为/dev/sdc）
    FILE* scsi_device = fopen("/dev/sdc", "rb");
    if (scsi_device == NULL)
    {
        printf("Failed to open SCSI device.\n");
        return 1;
    }

    unsigned long long start_sector = 0;   // 起始扇区
    unsigned int block_size = 512;         // 块大小（字节）
    unsigned int num_blocks = 10;          // 读取的块数

    // 调用SCSI读取函数
    scsi_read(scsi_device, start_sector, block_size, num_blocks);

    // 关闭SCSI设备文件
    fclose(scsi_device);
    
    return 0;
}

注意：上述代码仅为演示目的，请谨慎操作并确保对SCSI设备的访问有合法的权限。在实际使用时，请根据您的需求和环境进行相应的修改和错误处理。

#include 
#include 
#include 

#define READ_CAPACITY_CMD    0x25
#define READ_10_CMD          0x28

#define DATA_BUFFER_SIZE     4096

int scsi_read(FILE* scsi_device, unsigned long long start_sector, unsigned int block_size, unsigned int num_blocks, unsigned char* data_buffer)
{
    unsigned char read_cmd[10] = {
        READ_10_CMD,
        0x00,
        (start_sector >> 24) & 0xFF,
        (start_sector >> 16) & 0xFF,
        (start_sector >> 8) & 0xFF,
        start_sector & 0xFF,
        0x00,
        (num_blocks >> 8) & 0xFF,
        num_blocks & 0xFF,
        0x00
    };

    fseek(scsi_device, 0, SEEK_SET);  // 将文件指针移到开始位置

    // 发送SCSI命令
    fwrite(read_cmd, 1, sizeof(read_cmd), scsi_device);
    fflush(scsi_device);

    // 读取数据
    int bytes_read = fread(data_buffer, block_size, num_blocks, scsi_device);

    return bytes_read;
}

int main()
{
    // 打开SCSI设备文件（假设为/dev/sdc）
    FILE* scsi_device = fopen("/dev/sdc", "rb");
    if (scsi_device == NULL)
    {
        printf("Failed to open SCSI device.\n");
        return 1;
    }

    unsigned long long start_sector = 0;   // 起始扇区
    unsigned int block_size = 512;         // 块大小（字节）
    unsigned int num_blocks = 10;          // 读取的块数

    unsigned char data_buffer[DATA_BUFFER_SIZE];  // 存储读取到的数据

    // 调用SCSI读取函数
    int bytes_read = scsi_read(scsi_device, start_sector, block_size, num_blocks, data_buffer);
    if (bytes_read <= 0)
    {
        printf("Failed to read data from SCSI device.\n");
        fclose(scsi_device);
        return 1;
    }
    
    // 打印读取到的数据（仅用于示例）
    printf("Read Data:\n");
    for (int i = 0; i < bytes_read; i++)
    {
        printf("%02X ", data_buffer[i]);
        if ((i + 1) % block_size == 0)
            printf("\n");
    }

    // 关闭SCSI设备文件
    fclose(scsi_device);
    
    return 0;
}