mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
synced 2025-10-31 22:25:33 -04:00
28d97441e7
* fix pacat/paplay/pactl for new API version * fix memory leak in pa_ioline git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@304 fefdeb5f-60dc-0310-8127-8f9354f1896f
327 lines
8.7 KiB
C
327 lines
8.7 KiB
C
/* $Id$ */
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/***
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This file is part of polypaudio.
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polypaudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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polypaudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with polypaudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <errno.h>
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#include <stdio.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include "ioline.h"
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#include "xmalloc.h"
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#include "log.h"
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#define BUFFER_LIMIT (64*1024)
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#define READ_SIZE (1024)
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struct pa_ioline {
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struct pa_iochannel *io;
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struct pa_defer_event *defer_event;
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struct pa_mainloop_api *mainloop;
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int ref;
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int dead;
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char *wbuf;
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size_t wbuf_length, wbuf_index, wbuf_valid_length;
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char *rbuf;
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size_t rbuf_length, rbuf_index, rbuf_valid_length;
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void (*callback)(struct pa_ioline*io, const char *s, void *userdata);
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void *userdata;
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};
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static void io_callback(struct pa_iochannel*io, void *userdata);
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static void defer_callback(struct pa_mainloop_api*m, struct pa_defer_event*e, void *userdata);
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struct pa_ioline* pa_ioline_new(struct pa_iochannel *io) {
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struct pa_ioline *l;
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assert(io);
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l = pa_xmalloc(sizeof(struct pa_ioline));
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l->io = io;
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l->dead = 0;
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l->wbuf = NULL;
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l->wbuf_length = l->wbuf_index = l->wbuf_valid_length = 0;
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l->rbuf = NULL;
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l->rbuf_length = l->rbuf_index = l->rbuf_valid_length = 0;
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l->callback = NULL;
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l->userdata = NULL;
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l->ref = 1;
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l->mainloop = pa_iochannel_get_mainloop_api(io);
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l->defer_event = l->mainloop->defer_new(l->mainloop, defer_callback, l);
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l->mainloop->defer_enable(l->defer_event, 0);
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pa_iochannel_set_callback(io, io_callback, l);
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return l;
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}
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static void ioline_free(struct pa_ioline *l) {
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assert(l);
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if (l->io)
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pa_iochannel_free(l->io);
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if (l->defer_event)
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l->mainloop->defer_free(l->defer_event);
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pa_xfree(l->wbuf);
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pa_xfree(l->rbuf);
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pa_xfree(l);
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}
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void pa_ioline_unref(struct pa_ioline *l) {
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assert(l && l->ref >= 1);
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if ((--l->ref) <= 0)
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ioline_free(l);
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}
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struct pa_ioline* pa_ioline_ref(struct pa_ioline *l) {
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assert(l && l->ref >= 1);
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l->ref++;
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return l;
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}
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void pa_ioline_close(struct pa_ioline *l) {
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assert(l && l->ref >= 1);
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l->dead = 1;
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if (l->io) {
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pa_iochannel_free(l->io);
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l->io = NULL;
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}
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if (l->defer_event) {
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l->mainloop->defer_free(l->defer_event);
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l->defer_event = NULL;
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}
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}
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void pa_ioline_puts(struct pa_ioline *l, const char *c) {
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size_t len;
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assert(l && c && l->ref >= 1 && !l->dead);
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pa_ioline_ref(l);
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len = strlen(c);
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if (len > BUFFER_LIMIT - l->wbuf_valid_length)
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len = BUFFER_LIMIT - l->wbuf_valid_length;
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if (len) {
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assert(l->wbuf_length >= l->wbuf_valid_length);
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/* In case the allocated buffer is too small, enlarge it. */
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if (l->wbuf_valid_length + len > l->wbuf_length) {
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size_t n = l->wbuf_valid_length+len;
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char *new = pa_xmalloc(n);
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if (l->wbuf) {
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memcpy(new, l->wbuf+l->wbuf_index, l->wbuf_valid_length);
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pa_xfree(l->wbuf);
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}
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l->wbuf = new;
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l->wbuf_length = n;
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l->wbuf_index = 0;
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} else if (l->wbuf_index + l->wbuf_valid_length + len > l->wbuf_length) {
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/* In case the allocated buffer fits, but the current index is too far from the start, move it to the front. */
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memmove(l->wbuf, l->wbuf+l->wbuf_index, l->wbuf_valid_length);
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l->wbuf_index = 0;
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}
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assert(l->wbuf_index + l->wbuf_valid_length + len <= l->wbuf_length);
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/* Append the new string */
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memcpy(l->wbuf + l->wbuf_index + l->wbuf_valid_length, c, len);
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l->wbuf_valid_length += len;
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l->mainloop->defer_enable(l->defer_event, 1);
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}
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pa_ioline_unref(l);
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}
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void pa_ioline_set_callback(struct pa_ioline*l, void (*callback)(struct pa_ioline*io, const char *s, void *userdata), void *userdata) {
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assert(l && l->ref >= 1);
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l->callback = callback;
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l->userdata = userdata;
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}
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static void failure(struct pa_ioline *l) {
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assert(l && l->ref >= 1 && !l->dead);
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pa_ioline_close(l);
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if (l->callback)
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l->callback(l, NULL, l->userdata);
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}
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static void scan_for_lines(struct pa_ioline *l, size_t skip) {
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assert(l && l->ref >= 1 && skip < l->rbuf_valid_length);
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while (!l->dead && l->rbuf_valid_length > skip) {
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char *e, *p;
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size_t m;
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if (!(e = memchr(l->rbuf + l->rbuf_index + skip, '\n', l->rbuf_valid_length - skip)))
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break;
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*e = 0;
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p = l->rbuf + l->rbuf_index;
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m = strlen(p);
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l->rbuf_index += m+1;
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l->rbuf_valid_length -= m+1;
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/* A shortcut for the next time */
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if (l->rbuf_valid_length == 0)
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l->rbuf_index = 0;
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if (l->callback)
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l->callback(l, p, l->userdata);
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skip = 0;
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}
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/* If the buffer became too large and still no newline was found, drop it. */
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if (l->rbuf_valid_length >= BUFFER_LIMIT)
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l->rbuf_index = l->rbuf_valid_length = 0;
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}
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static int do_read(struct pa_ioline *l) {
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assert(l && l->ref >= 1);
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while (!l->dead && pa_iochannel_is_readable(l->io)) {
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ssize_t r;
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size_t len;
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len = l->rbuf_length - l->rbuf_index - l->rbuf_valid_length;
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/* Check if we have to enlarge the read buffer */
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if (len < READ_SIZE) {
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size_t n = l->rbuf_valid_length+READ_SIZE;
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if (n >= BUFFER_LIMIT)
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n = BUFFER_LIMIT;
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if (l->rbuf_length >= n) {
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/* The current buffer is large enough, let's just move the data to the front */
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if (l->rbuf_valid_length)
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memmove(l->rbuf, l->rbuf+l->rbuf_index, l->rbuf_valid_length);
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} else {
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/* Enlarge the buffer */
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char *new = pa_xmalloc(n);
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if (l->rbuf_valid_length)
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memcpy(new, l->rbuf+l->rbuf_index, l->rbuf_valid_length);
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pa_xfree(l->rbuf);
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l->rbuf = new;
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l->rbuf_length = n;
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}
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l->rbuf_index = 0;
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}
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len = l->rbuf_length - l->rbuf_index - l->rbuf_valid_length;
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assert(len >= READ_SIZE);
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/* Read some data */
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if ((r = pa_iochannel_read(l->io, l->rbuf+l->rbuf_index+l->rbuf_valid_length, len)) <= 0) {
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pa_log(__FILE__": read() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
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failure(l);
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return -1;
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}
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l->rbuf_valid_length += r;
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/* Look if a line has been terminated in the newly read data */
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scan_for_lines(l, l->rbuf_valid_length - r);
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}
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return 0;
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}
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/* Try to flush the buffer */
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static int do_write(struct pa_ioline *l) {
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ssize_t r;
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assert(l && l->ref >= 1);
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while (!l->dead && pa_iochannel_is_writable(l->io) && l->wbuf_valid_length) {
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if ((r = pa_iochannel_write(l->io, l->wbuf+l->wbuf_index, l->wbuf_valid_length)) < 0) {
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pa_log(__FILE__": write() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
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failure(l);
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return -1;
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}
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l->wbuf_index += r;
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l->wbuf_valid_length -= r;
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/* A shortcut for the next time */
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if (l->wbuf_valid_length == 0)
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l->wbuf_index = 0;
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}
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return 0;
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}
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/* Try to flush read/write data */
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static void do_work(struct pa_ioline *l) {
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assert(l && l->ref >= 1);
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pa_ioline_ref(l);
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l->mainloop->defer_enable(l->defer_event, 0);
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if (!l->dead)
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do_write(l);
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if (!l->dead)
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do_read(l);
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pa_ioline_unref(l);
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}
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static void io_callback(struct pa_iochannel*io, void *userdata) {
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struct pa_ioline *l = userdata;
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assert(io && l && l->ref >= 1);
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do_work(l);
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}
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static void defer_callback(struct pa_mainloop_api*m, struct pa_defer_event*e, void *userdata) {
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struct pa_ioline *l = userdata;
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assert(l && l->ref >= 1 && l->mainloop == m && l->defer_event == e);
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do_work(l);
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}
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