66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
#include "protorpc.h"
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#include <string.h> // import memcpy
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int protorpc_pack(const protorpc_message* msg, void* buf, int len) {
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if (!msg || !buf || !len) return -1;
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const protorpc_head* head = &(msg->head);
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unsigned int packlen = protorpc_package_length(head);
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// Check is buffer enough
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if (len < packlen) {
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return -2;
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}
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unsigned char* p = (unsigned char*)buf;
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*p++ = head->protocol[0];
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*p++ = head->protocol[1];
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*p++ = head->protocol[2];
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*p++ = head->protocol[3];
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*p++ = head->version;
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*p++ = head->flags;
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*p++ = head->reserved[0];
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*p++ = head->reserved[1];
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// hton length
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unsigned int length = head->length;
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*p++ = (length >> 24) & 0xFF;
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*p++ = (length >> 16) & 0xFF;
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*p++ = (length >> 8) & 0xFF;
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*p++ = length & 0xFF;
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// memcpy body
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if (msg->body && head->length) {
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memcpy(p, msg->body, head->length);
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}
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return packlen;
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}
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int protorpc_unpack(protorpc_message* msg, const void* buf, int len) {
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if (!msg || !buf || !len) return -1;
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if (len < PROTORPC_HEAD_LENGTH) return -2;
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protorpc_head* head = &(msg->head);
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const unsigned char* p = (const unsigned char*)buf;
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head->protocol[0] = *p++;
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head->protocol[1] = *p++;
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head->protocol[2] = *p++;
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head->protocol[3] = *p++;
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head->version = *p++;
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head->flags = *p++;
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head->reserved[0] = *p++;
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head->reserved[1] = *p++;
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// ntoh length
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head->length = ((unsigned int)*p++) << 24;
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head->length |= ((unsigned int)*p++) << 16;
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head->length |= ((unsigned int)*p++) << 8;
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head->length |= *p++;
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// Check is buffer enough
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unsigned int packlen = protorpc_package_length(head);
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if (len < packlen) {
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return -3;
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}
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// NOTE: just shadow copy
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if (len > PROTORPC_HEAD_LENGTH) {
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msg->body = (const char*)buf + PROTORPC_HEAD_LENGTH;
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}
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return packlen;
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}
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