提供一个C语言的KB级数据分包组包代码
时间: 2024-02-22 11:59:01 浏览: 20
以下是一个简单的C语言的KB级数据分包、组包的代码示例:
```
// 数据分包函数
int pack_data(char *data, int data_len, char *pack_buf, int pack_size)
{
int i, pack_num, last_pack_size, offset;
pack_num = data_len / pack_size;
last_pack_size = data_len % pack_size;
if (last_pack_size > 0) pack_num++;
for (i = 0; i < pack_num; i++) {
offset = i * pack_size;
if (i == pack_num - 1 && last_pack_size > 0) {
// 最后一个包不足pack_size字节,填充0
memset(pack_buf + i * pack_size, 0, pack_size);
memcpy(pack_buf + i * pack_size, data + offset, last_pack_size);
} else {
memcpy(pack_buf + i * pack_size, data + offset, pack_size);
}
}
return pack_num;
}
// 数据组包函数
int unpack_data(char *pack_buf, int pack_num, char *unpack_buf, int pack_size)
{
int i, data_len, last_pack_size, offset;
data_len = (pack_num - 1) * pack_size;
last_pack_size = pack_size;
if (*(pack_buf + (pack_num - 1) * pack_size) == 0) {
last_pack_size = strlen(pack_buf + (pack_num - 1) * pack_size) + 1;
}
data_len += last_pack_size;
for (i = 0; i < pack_num; i++) {
offset = i * pack_size;
if (i == pack_num - 1 && last_pack_size > 0) {
memcpy(unpack_buf + offset, pack_buf + offset, last_pack_size);
} else {
memcpy(unpack_buf + offset, pack_buf + offset, pack_size);
}
}
return data_len;
}
```
使用示例:
```
#define PACK_SIZE 64
char data[1024] = "This is a test data.";
char pack_buf[PACK_SIZE * 16];
char unpack_buf[1024];
int pack_num, unpack_len;
pack_num = pack_data(data, strlen(data), pack_buf, PACK_SIZE);
printf("pack_num=%d\n", pack_num);
unpack_len = unpack_data(pack_buf, pack_num, unpack_buf, PACK_SIZE);
printf("unpack_len=%d, unpack_buf=%s\n", unpack_len, unpack_buf);
```
上述代码中,pack_data函数将data数据分包存储到pack_buf中,每个包大小为PACK_SIZE字节;unpack_data函数将pack_buf中的数据组包存储到unpack_buf中。