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#define MAX_MSG_SIZE 128
#define pos(x, y) (x) + (y) * window_w
struct Client {
int sockfd;
Point cursor;
Point window_start;
Client(const Buffer &b) : cursor(b), window_start(cursor) {}
void parse_message() {
uint8_t message[MAX_MSG_SIZE] = {};
read(sockfd, message, MAX_MSG_SIZE - 1);
uint8_t *iter = message;
while (*iter) {
switch (*iter) {
case OP_MOVE1:
move(iter[1]);
iter += 2;
break;
case OP_MOVE2:
move(decode2(iter, 1));
iter += 3;
break;
case OP_MOVE4:
move(decode4(iter, 1));
iter += 5;
break;
case OP_MOVE8:
move(decode8(iter, 1));
iter += 9;
break;
case OP_INSERT:
push(iter[1]);
iter += 2;
break;
case OP_DELETE:
pop();
iter += 1;
break;
case OP_SHOW:
show(decode2(iter, 1), decode2(iter, 3));
iter += 6;
break;
}
}
}
void show(int16_t window_w, int16_t window_h) {
char *view = new char[window_w * window_h];
Point window_end(window_start);
for (int i = 0; i < window_h; i++) {
for (int j = 0; j < window_w; j++) {
if (window_end == cursor) {
view[pos(j, i)] = '$';
} else {
view[pos(j, i)] = window_end.element();
}
if (window_end.element() == '\n') {
for (int k = j + 1; k < window_w; k++) {
view[pos(k, i)] = 0;
}
j = window_w;
} else if (window_end.element() == '\t') {
for (int k = j + 1; k < j + 8; k++) {
view[pos(k, i)] = 0;
}
j = j + 7;
}
window_end++;
}
}
write(sockfd, view, window_w * window_h);
delete[] view;
}
void move(int64_t target) {
while (target > 0) {
cursor++;
target--;
}
while (target < 0) {
cursor--;
target++;
}
}
void push(int8_t input) {
cursor.push(input);
}
void pop() {
cursor.pop();
}
};
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