144 lines
3.9 KiB
C
144 lines
3.9 KiB
C
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#include "config.h"
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#include "protocol.h"
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#include "socket.h"
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#include "unicode.h"
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#include <stddef.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define GUAC_SOCKET_NEST_BUFFER_SIZE 8192
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typedef struct __guac_socket_nest_data {
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guac_socket* parent;
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char buffer[GUAC_SOCKET_NEST_BUFFER_SIZE];
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int index;
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} __guac_socket_nest_data;
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ssize_t __guac_socket_nest_write_handler(guac_socket* socket,
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const void* buf, size_t count) {
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__guac_socket_nest_data* data = (__guac_socket_nest_data*) socket->data;
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unsigned char* source = (unsigned char*) buf;
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/* Current location in destination buffer during copy */
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char* current = data->buffer;
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/* Number of bytes remaining in source buffer */
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int remaining = count;
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/* If we can't actually store that many bytes, reduce number of bytes
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* expected to be written */
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if (remaining > GUAC_SOCKET_NEST_BUFFER_SIZE)
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remaining = GUAC_SOCKET_NEST_BUFFER_SIZE;
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/* Current offset within destination buffer */
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int offset;
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/* Number of characters before start of next character */
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int skip = 0;
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/* Copy UTF-8 characters into buffer */
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for (offset = 0; offset < GUAC_SOCKET_NEST_BUFFER_SIZE; offset++) {
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/* Get next byte */
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unsigned char c = *source;
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remaining--;
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/* If skipping, then skip */
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if (skip > 0) skip--;
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/* Otherwise, determine next skip value, and increment length */
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else {
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/* Determine skip value (size in bytes of rest of character) */
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skip = guac_utf8_charsize(c) - 1;
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/* If not enough bytes to complete character, break */
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if (skip > remaining)
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break;
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}
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/* Store byte */
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*current = c;
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/* Advance to next character */
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source++;
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current++;
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}
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/* Append null-terminator */
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*current = 0;
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/* Send nest instruction containing read UTF-8 segment */
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guac_protocol_send_nest(data->parent, data->index, data->buffer);
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/* Return number of bytes actually written */
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return offset;
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}
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/**
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* Frees all implementation-specific data associated with the given socket, but
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* not the socket object itself.
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*
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* @param socket
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* The guac_socket whose associated data should be freed.
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*
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* @return
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* Zero if the data was successfully freed, non-zero otherwise. This
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* implementation always succeeds, and will always return zero.
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*/
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static int __guac_socket_nest_free_handler(guac_socket* socket) {
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/* Free associated data */
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__guac_socket_nest_data* data = (__guac_socket_nest_data*) socket->data;
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free(data);
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return 0;
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}
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guac_socket* guac_socket_nest(guac_socket* parent, int index) {
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/* Allocate socket and associated data */
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guac_socket* socket = guac_socket_alloc();
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__guac_socket_nest_data* data = malloc(sizeof(__guac_socket_nest_data));
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/* Store file descriptor as socket data */
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data->parent = parent;
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socket->data = data;
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/* Set write and free handlers */
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socket->write_handler = __guac_socket_nest_write_handler;
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socket->free_handler = __guac_socket_nest_free_handler;
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return socket;
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}
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