71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include "msg.h"
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#if INTERFACE
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#define INITIAL_SIZE 32
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struct Buffer {
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int size;
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void *data;
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};
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struct message {
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long timestamp;
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int width; // varies
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int height; // normally 80
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char **image; // dimension is width x height
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};
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#endif
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struct Buffer *new_buffer() {
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struct Buffer *b = malloc(sizeof(Buffer));
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b->data = malloc(INITIAL_SIZE);
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b->size = 0;
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return b;
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}
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void append_space(Buffer * b, int n) {
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b->size += n;
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b->data = realloc(b->data, b->size);
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}
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void serialize_int(int x, Buffer * b) {
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// htonl :: uint32_t -> uint32_t -- converts the parameter from host byte order to network byte order
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x = htonl(x);
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append_space(b, sizeof(int));
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memcpy( ((char*)b->data) + b->size, &x, sizeof(int));
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b->size += sizeof(int);
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}
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void serialize_string(char *str, Buffer *b) {
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int newlen = strlen(str);
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append_space(b, newlen);
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for (int i=0; i < newlen; ++i) {
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memcpy( ((char*)b->data) + b->size + i, str[i], sizeof(char));
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}
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b->size += newlen;
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}
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void serialize_message(struct message *msg, Buffer *b) {
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serialize_int(msg->timestamp, b); // does this also work for long?
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serialize_int(msg->width, b);
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serialize_int(msg->heigth, b);
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serialize_string(msg->image, b);
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}
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