4 This file is part of PulseAudio.
6 Copyright 2004-2006 Lennart Poettering
8 PulseAudio is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published
10 by the Free Software Foundation; either version 2 of the License,
11 or (at your option) any later version.
13 PulseAudio is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with PulseAudio; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
33 #include <pulse/xmalloc.h>
35 #include <pulsecore/winsock.h>
36 #include <pulsecore/core-error.h>
37 #include <pulsecore/log.h>
38 #include <pulsecore/macro.h>
39 #include <pulsecore/refcnt.h>
43 #define BUFFER_LIMIT (64*1024)
44 #define READ_SIZE (1024)
50 pa_defer_event *defer_event;
51 pa_mainloop_api *mainloop;
54 size_t wbuf_length, wbuf_index, wbuf_valid_length;
57 size_t rbuf_length, rbuf_index, rbuf_valid_length;
59 pa_ioline_cb_t callback;
63 pa_bool_t defer_close:1;
66 static void io_callback(pa_iochannel*io, void *userdata);
67 static void defer_callback(pa_mainloop_api*m, pa_defer_event*e, void *userdata);
69 pa_ioline* pa_ioline_new(pa_iochannel *io) {
73 l = pa_xnew(pa_ioline, 1);
78 l->wbuf_length = l->wbuf_index = l->wbuf_valid_length = 0;
81 l->rbuf_length = l->rbuf_index = l->rbuf_valid_length = 0;
86 l->mainloop = pa_iochannel_get_mainloop_api(io);
88 l->defer_event = l->mainloop->defer_new(l->mainloop, defer_callback, l);
89 l->mainloop->defer_enable(l->defer_event, 0);
92 l->defer_close = FALSE;
94 pa_iochannel_set_callback(io, io_callback, l);
99 static void ioline_free(pa_ioline *l) {
103 pa_iochannel_free(l->io);
106 l->mainloop->defer_free(l->defer_event);
113 void pa_ioline_unref(pa_ioline *l) {
115 pa_assert(PA_REFCNT_VALUE(l) >= 1);
117 if (PA_REFCNT_DEC(l) <= 0)
121 pa_ioline* pa_ioline_ref(pa_ioline *l) {
123 pa_assert(PA_REFCNT_VALUE(l) >= 1);
129 void pa_ioline_close(pa_ioline *l) {
131 pa_assert(PA_REFCNT_VALUE(l) >= 1);
136 pa_iochannel_free(l->io);
140 if (l->defer_event) {
141 l->mainloop->defer_free(l->defer_event);
142 l->defer_event = NULL;
149 void pa_ioline_puts(pa_ioline *l, const char *c) {
153 pa_assert(PA_REFCNT_VALUE(l) >= 1);
160 if (len > BUFFER_LIMIT - l->wbuf_valid_length)
161 len = BUFFER_LIMIT - l->wbuf_valid_length;
164 pa_assert(l->wbuf_length >= l->wbuf_valid_length);
166 /* In case the allocated buffer is too small, enlarge it. */
167 if (l->wbuf_valid_length + len > l->wbuf_length) {
168 size_t n = l->wbuf_valid_length+len;
169 char *new = pa_xnew(char, n);
172 memcpy(new, l->wbuf+l->wbuf_index, l->wbuf_valid_length);
179 } else if (l->wbuf_index + l->wbuf_valid_length + len > l->wbuf_length) {
181 /* In case the allocated buffer fits, but the current index is too far from the start, move it to the front. */
182 memmove(l->wbuf, l->wbuf+l->wbuf_index, l->wbuf_valid_length);
186 pa_assert(l->wbuf_index + l->wbuf_valid_length + len <= l->wbuf_length);
188 /* Append the new string */
189 memcpy(l->wbuf + l->wbuf_index + l->wbuf_valid_length, c, len);
190 l->wbuf_valid_length += len;
192 l->mainloop->defer_enable(l->defer_event, 1);
196 void pa_ioline_set_callback(pa_ioline*l, pa_ioline_cb_t callback, void *userdata) {
198 pa_assert(PA_REFCNT_VALUE(l) >= 1);
203 l->callback = callback;
204 l->userdata = userdata;
207 static void failure(pa_ioline *l, pa_bool_t process_leftover) {
209 pa_assert(PA_REFCNT_VALUE(l) >= 1);
212 if (process_leftover && l->rbuf_valid_length > 0) {
213 /* Pass the last missing bit to the client */
216 char *p = pa_xstrndup(l->rbuf+l->rbuf_index, l->rbuf_valid_length);
217 l->callback(l, p, l->userdata);
223 l->callback(l, NULL, l->userdata);
230 static void scan_for_lines(pa_ioline *l, size_t skip) {
232 pa_assert(PA_REFCNT_VALUE(l) >= 1);
233 pa_assert(skip < l->rbuf_valid_length);
235 while (!l->dead && l->rbuf_valid_length > skip) {
239 if (!(e = memchr(l->rbuf + l->rbuf_index + skip, '\n', l->rbuf_valid_length - skip)))
244 p = l->rbuf + l->rbuf_index;
247 l->rbuf_index += m+1;
248 l->rbuf_valid_length -= m+1;
250 /* A shortcut for the next time */
251 if (l->rbuf_valid_length == 0)
255 l->callback(l, pa_strip_nl(p), l->userdata);
260 /* If the buffer became too large and still no newline was found, drop it. */
261 if (l->rbuf_valid_length >= BUFFER_LIMIT)
262 l->rbuf_index = l->rbuf_valid_length = 0;
265 static int do_write(pa_ioline *l);
267 static int do_read(pa_ioline *l) {
269 pa_assert(PA_REFCNT_VALUE(l) >= 1);
271 while (!l->dead && pa_iochannel_is_readable(l->io)) {
275 len = l->rbuf_length - l->rbuf_index - l->rbuf_valid_length;
277 /* Check if we have to enlarge the read buffer */
278 if (len < READ_SIZE) {
279 size_t n = l->rbuf_valid_length+READ_SIZE;
281 if (n >= BUFFER_LIMIT)
284 if (l->rbuf_length >= n) {
285 /* The current buffer is large enough, let's just move the data to the front */
286 if (l->rbuf_valid_length)
287 memmove(l->rbuf, l->rbuf+l->rbuf_index, l->rbuf_valid_length);
289 /* Enlarge the buffer */
290 char *new = pa_xnew(char, n);
291 if (l->rbuf_valid_length)
292 memcpy(new, l->rbuf+l->rbuf_index, l->rbuf_valid_length);
301 len = l->rbuf_length - l->rbuf_index - l->rbuf_valid_length;
303 pa_assert(len >= READ_SIZE);
306 if ((r = pa_iochannel_read(l->io, l->rbuf+l->rbuf_index+l->rbuf_valid_length, len)) <= 0) {
308 if (r < 0 && errno == EAGAIN)
311 if (r < 0 && errno != ECONNRESET) {
312 pa_log("read(): %s", pa_cstrerror(errno));
320 l->rbuf_valid_length += r;
322 /* Look if a line has been terminated in the newly read data */
323 scan_for_lines(l, l->rbuf_valid_length - r);
329 /* Try to flush the buffer */
330 static int do_write(pa_ioline *l) {
334 pa_assert(PA_REFCNT_VALUE(l) >= 1);
336 while (!l->dead && pa_iochannel_is_writable(l->io) && l->wbuf_valid_length) {
338 if ((r = pa_iochannel_write(l->io, l->wbuf+l->wbuf_index, l->wbuf_valid_length)) <= 0) {
340 if (r < 0 && errno == EAGAIN)
343 if (r < 0 && errno != EPIPE)
344 pa_log("write(): %s", pa_cstrerror(errno));
352 l->wbuf_valid_length -= r;
354 /* A shortcut for the next time */
355 if (l->wbuf_valid_length == 0)
362 /* Try to flush read/write data */
363 static void do_work(pa_ioline *l) {
365 pa_assert(PA_REFCNT_VALUE(l) >= 1);
369 l->mainloop->defer_enable(l->defer_event, 0);
377 if (l->defer_close && !l->wbuf_valid_length)
383 static void io_callback(pa_iochannel*io, void *userdata) {
384 pa_ioline *l = userdata;
388 pa_assert(PA_REFCNT_VALUE(l) >= 1);
393 static void defer_callback(pa_mainloop_api*m, pa_defer_event*e, void *userdata) {
394 pa_ioline *l = userdata;
397 pa_assert(PA_REFCNT_VALUE(l) >= 1);
398 pa_assert(l->mainloop == m);
399 pa_assert(l->defer_event == e);
404 void pa_ioline_defer_close(pa_ioline *l) {
406 pa_assert(PA_REFCNT_VALUE(l) >= 1);
408 l->defer_close = TRUE;
410 if (!l->wbuf_valid_length)
411 l->mainloop->defer_enable(l->defer_event, 1);
414 void pa_ioline_printf(pa_ioline *l, const char *format, ...) {
419 pa_assert(PA_REFCNT_VALUE(l) >= 1);
421 va_start(ap, format);
422 t = pa_vsprintf_malloc(format, ap);
425 pa_ioline_puts(l, t);