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protocol.c
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protocol.c
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#include "protocol.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "define.h"
package_t *alloc_packet(uint32_t data_len)
{
package_t *package = zmalloc(sizeof(package_head_t) + data_len);
if (package) {
package->head.magic = MAGIC_NUMBER;
package->head.length = data_len;
}
return package;
}
void free_package(package_t *package)
{
zfree(package);
}
int packet_decode(buffer_t *buffer, package_t **package)
{
size_t data_len = get_readable_size(buffer);
if (data_len < sizeof(package_head_t)) {
return -1;
}
package_head_t *package_head = (package_head_t *)(buffer->buff + buffer->read_idx);
if (package_head->magic != MAGIC_NUMBER) {
return -2;
}
size_t package_len = sizeof(package_head_t) + package_head->length;
if (data_len < package_len) {
return -1;
}
package_t *new_package = zmalloc(package_len);
memcpy(new_package, buffer->buff + buffer->read_idx, package_len);
buffer->read_idx += package_len;
*package = new_package;
return 0;
}
int package_encode(buffer_t *buffer, package_t *package)
{
size_t avlid_size = get_writeable_size(buffer);
size_t package_len = sizeof(package_head_t) + package->head.length;
if (avlid_size < package_len) {
return -1;
}
memcpy(buffer->buff + buffer->write_idx, package, package_len);
buffer->write_idx += package_len;
return 0;
}
void do_package(package_t *req_package, package_t **resp_package)
{
static int n = 0;
const char * const name = "hurley";
switch (req_package->head.type) {
case QUERY_NAME:
*resp_package = alloc_packet((uint32_t)strlen(name) + 1);
if (*resp_package) {
memcpy((*resp_package)->data, name, strlen(name) + 1);
} else {
printf("alloc package error, OOM ?");
}
break;
case CHAT_MESSAGE:
// client send data with '\0'
printf("chat message: No.%d %s\n", n++, req_package->data);
break;
default:
printf("Unknown package, pcode: %d\n", req_package->head.type);
break;
}
}