4 This file is part of polypaudio.
6 polypaudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2 of the License,
9 or (at your option) any later version.
11 polypaudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with polypaudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
36 #define BUFFER_LIMIT (64*1024)
37 #define READ_SIZE (1024)
40 struct pa_iochannel *io;
41 struct pa_defer_event *defer_event;
42 struct pa_mainloop_api *mainloop;
47 size_t wbuf_length, wbuf_index, wbuf_valid_length;
50 size_t rbuf_length, rbuf_index, rbuf_valid_length;
52 void (*callback)(struct pa_ioline*io, const char *s, void *userdata);
56 static void io_callback(struct pa_iochannel*io, void *userdata);
57 static void defer_callback(struct pa_mainloop_api*m, struct pa_defer_event*e, void *userdata);
59 struct pa_ioline* pa_ioline_new(struct pa_iochannel *io) {
63 l = pa_xmalloc(sizeof(struct pa_ioline));
68 l->wbuf_length = l->wbuf_index = l->wbuf_valid_length = 0;
71 l->rbuf_length = l->rbuf_index = l->rbuf_valid_length = 0;
77 l->mainloop = pa_iochannel_get_mainloop_api(io);
79 l->defer_event = l->mainloop->defer_new(l->mainloop, defer_callback, l);
80 l->mainloop->defer_enable(l->defer_event, 0);
82 pa_iochannel_set_callback(io, io_callback, l);
87 static void ioline_free(struct pa_ioline *l) {
91 pa_iochannel_free(l->io);
94 l->mainloop->defer_free(l->defer_event);
101 void pa_ioline_unref(struct pa_ioline *l) {
102 assert(l && l->ref >= 1);
108 struct pa_ioline* pa_ioline_ref(struct pa_ioline *l) {
109 assert(l && l->ref >= 1);
115 void pa_ioline_close(struct pa_ioline *l) {
116 assert(l && l->ref >= 1);
120 pa_iochannel_free(l->io);
124 if (l->defer_event) {
125 l->mainloop->defer_free(l->defer_event);
126 l->defer_event = NULL;
130 void pa_ioline_puts(struct pa_ioline *l, const char *c) {
132 assert(l && c && l->ref >= 1 && !l->dead);
137 if (len > BUFFER_LIMIT - l->wbuf_valid_length)
138 len = BUFFER_LIMIT - l->wbuf_valid_length;
141 assert(l->wbuf_length >= l->wbuf_valid_length);
143 /* In case the allocated buffer is too small, enlarge it. */
144 if (l->wbuf_valid_length + len > l->wbuf_length) {
145 size_t n = l->wbuf_valid_length+len;
146 char *new = pa_xmalloc(n);
148 memcpy(new, l->wbuf+l->wbuf_index, l->wbuf_valid_length);
154 } else if (l->wbuf_index + l->wbuf_valid_length + len > l->wbuf_length) {
156 /* In case the allocated buffer fits, but the current index is too far from the start, move it to the front. */
157 memmove(l->wbuf, l->wbuf+l->wbuf_index, l->wbuf_valid_length);
161 assert(l->wbuf_index + l->wbuf_valid_length + len <= l->wbuf_length);
163 /* Append the new string */
164 memcpy(l->wbuf + l->wbuf_index + l->wbuf_valid_length, c, len);
165 l->wbuf_valid_length += len;
167 l->mainloop->defer_enable(l->defer_event, 1);
173 void pa_ioline_set_callback(struct pa_ioline*l, void (*callback)(struct pa_ioline*io, const char *s, void *userdata), void *userdata) {
174 assert(l && l->ref >= 1);
175 l->callback = callback;
176 l->userdata = userdata;
179 static void failure(struct pa_ioline *l) {
180 assert(l && l->ref >= 1 && !l->dead);
185 l->callback(l, NULL, l->userdata);
188 static void scan_for_lines(struct pa_ioline *l, size_t skip) {
189 assert(l && l->ref >= 1 && skip < l->rbuf_valid_length);
191 while (!l->dead && l->rbuf_valid_length > skip) {
195 if (!(e = memchr(l->rbuf + l->rbuf_index + skip, '\n', l->rbuf_valid_length - skip)))
200 p = l->rbuf + l->rbuf_index;
203 l->rbuf_index += m+1;
204 l->rbuf_valid_length -= m+1;
206 /* A shortcut for the next time */
207 if (l->rbuf_valid_length == 0)
211 l->callback(l, p, l->userdata);
216 /* If the buffer became too large and still no newline was found, drop it. */
217 if (l->rbuf_valid_length >= BUFFER_LIMIT)
218 l->rbuf_index = l->rbuf_valid_length = 0;
221 static int do_read(struct pa_ioline *l) {
222 assert(l && l->ref >= 1);
224 while (!l->dead && pa_iochannel_is_readable(l->io)) {
228 len = l->rbuf_length - l->rbuf_index - l->rbuf_valid_length;
230 /* Check if we have to enlarge the read buffer */
231 if (len < READ_SIZE) {
232 size_t n = l->rbuf_valid_length+READ_SIZE;
234 if (n >= BUFFER_LIMIT)
237 if (l->rbuf_length >= n) {
238 /* The current buffer is large enough, let's just move the data to the front */
239 if (l->rbuf_valid_length)
240 memmove(l->rbuf, l->rbuf+l->rbuf_index, l->rbuf_valid_length);
242 /* Enlarge the buffer */
243 char *new = pa_xmalloc(n);
244 if (l->rbuf_valid_length)
245 memcpy(new, l->rbuf+l->rbuf_index, l->rbuf_valid_length);
254 len = l->rbuf_length - l->rbuf_index - l->rbuf_valid_length;
256 assert(len >= READ_SIZE);
259 if ((r = pa_iochannel_read(l->io, l->rbuf+l->rbuf_index+l->rbuf_valid_length, len)) <= 0) {
260 pa_log(__FILE__": read() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
265 l->rbuf_valid_length += r;
267 /* Look if a line has been terminated in the newly read data */
268 scan_for_lines(l, l->rbuf_valid_length - r);
274 /* Try to flush the buffer */
275 static int do_write(struct pa_ioline *l) {
277 assert(l && l->ref >= 1);
279 while (!l->dead && pa_iochannel_is_writable(l->io) && l->wbuf_valid_length) {
281 if ((r = pa_iochannel_write(l->io, l->wbuf+l->wbuf_index, l->wbuf_valid_length)) < 0) {
282 pa_log(__FILE__": write() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
288 l->wbuf_valid_length -= r;
290 /* A shortcut for the next time */
291 if (l->wbuf_valid_length == 0)
298 /* Try to flush read/write data */
299 static void do_work(struct pa_ioline *l) {
300 assert(l && l->ref >= 1);
304 l->mainloop->defer_enable(l->defer_event, 0);
315 static void io_callback(struct pa_iochannel*io, void *userdata) {
316 struct pa_ioline *l = userdata;
317 assert(io && l && l->ref >= 1);
322 static void defer_callback(struct pa_mainloop_api*m, struct pa_defer_event*e, void *userdata) {
323 struct pa_ioline *l = userdata;
324 assert(l && l->ref >= 1 && l->mainloop == m && l->defer_event == e);