1 files changed, 463 insertions, 0 deletions
diff --git a/src/pulsecore/ioline.c b/src/pulsecore/ioline.c
new file mode 100644
index 0000000..dfc5a73
--- /dev/null
+++ b/src/pulsecore/ioline.c
@@ -0,0 +1,463 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2.1 of the License,
+  or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/socket.h>
+#include <pulsecore/core-error.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/log.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/refcnt.h>
+
+#include "ioline.h"
+
+#define BUFFER_LIMIT (64*1024)
+#define READ_SIZE (1024)
+
+struct pa_ioline {
+    PA_REFCNT_DECLARE;
+
+    pa_iochannel *io;
+    pa_defer_event *defer_event;
+    pa_mainloop_api *mainloop;
+
+    char *wbuf;
+    size_t wbuf_length, wbuf_index, wbuf_valid_length;
+
+    char *rbuf;
+    size_t rbuf_length, rbuf_index, rbuf_valid_length;
+
+    pa_ioline_cb_t callback;
+    void *userdata;
+
+    pa_ioline_drain_cb_t drain_callback;
+    void *drain_userdata;
+
+    bool dead:1;
+    bool defer_close:1;
+};
+
+static void io_callback(pa_iochannel*io, void *userdata);
+static void defer_callback(pa_mainloop_api*m, pa_defer_event*e, void *userdata);
+
+pa_ioline* pa_ioline_new(pa_iochannel *io) {
+    pa_ioline *l;
+    pa_assert(io);
+
+    l = pa_xnew(pa_ioline, 1);
+    PA_REFCNT_INIT(l);
+    l->io = io;
+
+    l->wbuf = NULL;
+    l->wbuf_length = l->wbuf_index = l->wbuf_valid_length = 0;
+
+    l->rbuf = NULL;
+    l->rbuf_length = l->rbuf_index = l->rbuf_valid_length = 0;
+
+    l->callback = NULL;
+    l->userdata = NULL;
+
+    l->drain_callback = NULL;
+    l->drain_userdata = NULL;
+
+    l->mainloop = pa_iochannel_get_mainloop_api(io);
+
+    l->defer_event = l->mainloop->defer_new(l->mainloop, defer_callback, l);
+    l->mainloop->defer_enable(l->defer_event, 0);
+
+    l->dead = false;
+    l->defer_close = false;
+
+    pa_iochannel_set_callback(io, io_callback, l);
+
+    return l;
+}
+
+static void ioline_free(pa_ioline *l) {
+    pa_assert(l);
+
+    if (l->io)
+        pa_iochannel_free(l->io);
+
+    if (l->defer_event)
+        l->mainloop->defer_free(l->defer_event);
+
+    pa_xfree(l->wbuf);
+    pa_xfree(l->rbuf);
+    pa_xfree(l);
+}
+
+void pa_ioline_unref(pa_ioline *l) {
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+
+    if (PA_REFCNT_DEC(l) <= 0)
+        ioline_free(l);
+}
+
+pa_ioline* pa_ioline_ref(pa_ioline *l) {
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+
+    PA_REFCNT_INC(l);
+    return l;
+}
+
+void pa_ioline_close(pa_ioline *l) {
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+
+    l->dead = true;
+
+    if (l->io) {
+        pa_iochannel_free(l->io);
+        l->io = NULL;
+    }
+
+    if (l->defer_event) {
+        l->mainloop->defer_free(l->defer_event);
+        l->defer_event = NULL;
+    }
+
+    if (l->callback)
+        l->callback = NULL;
+}
+
+void pa_ioline_puts(pa_ioline *l, const char *c) {
+    size_t len;
+
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+    pa_assert(c);
+
+    if (l->dead)
+        return;
+
+    len = strlen(c);
+    if (len > BUFFER_LIMIT - l->wbuf_valid_length)
+        len = BUFFER_LIMIT - l->wbuf_valid_length;
+
+    if (len) {
+        pa_assert(l->wbuf_length >= l->wbuf_valid_length);
+
+        /* In case the allocated buffer is too small, enlarge it. */
+        if (l->wbuf_valid_length + len > l->wbuf_length) {
+            size_t n = l->wbuf_valid_length+len;
+            char *new = pa_xnew(char, (unsigned) n);
+
+            if (l->wbuf) {
+                memcpy(new, l->wbuf+l->wbuf_index, l->wbuf_valid_length);
+                pa_xfree(l->wbuf);
+            }
+
+            l->wbuf = new;
+            l->wbuf_length = n;
+            l->wbuf_index = 0;
+        } else if (l->wbuf_index + l->wbuf_valid_length + len > l->wbuf_length) {
+
+            /* In case the allocated buffer fits, but the current index is too far from the start, move it to the front. */
+            memmove(l->wbuf, l->wbuf+l->wbuf_index, l->wbuf_valid_length);
+            l->wbuf_index = 0;
+        }
+
+        pa_assert(l->wbuf_index + l->wbuf_valid_length + len <= l->wbuf_length);
+
+        /* Append the new string */
+        memcpy(l->wbuf + l->wbuf_index + l->wbuf_valid_length, c, len);
+        l->wbuf_valid_length += len;
+
+        l->mainloop->defer_enable(l->defer_event, 1);
+    }
+}
+
+void pa_ioline_set_callback(pa_ioline*l, pa_ioline_cb_t callback, void *userdata) {
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+
+    if (l->dead)
+        return;
+
+    l->callback = callback;
+    l->userdata = userdata;
+}
+
+void pa_ioline_set_drain_callback(pa_ioline*l, pa_ioline_drain_cb_t callback, void *userdata) {
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+
+    if (l->dead)
+        return;
+
+    l->drain_callback = callback;
+    l->drain_userdata = userdata;
+}
+
+static void failure(pa_ioline *l, bool process_leftover) {
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+    pa_assert(!l->dead);
+
+    if (process_leftover && l->rbuf_valid_length > 0) {
+        /* Pass the last missing bit to the client */
+
+        if (l->callback) {
+            char *p = pa_xstrndup(l->rbuf+l->rbuf_index, l->rbuf_valid_length);
+            l->callback(l, p, l->userdata);
+            pa_xfree(p);
+        }
+    }
+
+    if (l->callback) {
+        l->callback(l, NULL, l->userdata);
+        l->callback = NULL;
+    }
+
+    pa_ioline_close(l);
+}
+
+static void scan_for_lines(pa_ioline *l, size_t skip) {
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+    pa_assert(skip < l->rbuf_valid_length);
+
+    while (!l->dead && l->rbuf_valid_length > skip) {
+        char *e, *p;
+        size_t m;
+
+        if (!(e = memchr(l->rbuf + l->rbuf_index + skip, '\n', l->rbuf_valid_length - skip)))
+            break;
+
+        *e = 0;
+
+        p = l->rbuf + l->rbuf_index;
+        m = strlen(p);
+
+        l->rbuf_index += m+1;
+        l->rbuf_valid_length -= m+1;
+
+        /* A shortcut for the next time */
+        if (l->rbuf_valid_length == 0)
+            l->rbuf_index = 0;
+
+        if (l->callback)
+            l->callback(l, pa_strip_nl(p), l->userdata);
+
+        skip = 0;
+    }
+
+    /* If the buffer became too large and still no newline was found, drop it. */
+    if (l->rbuf_valid_length >= BUFFER_LIMIT)
+        l->rbuf_index = l->rbuf_valid_length = 0;
+}
+
+static int do_write(pa_ioline *l);
+
+static int do_read(pa_ioline *l) {
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+
+    while (l->io && !l->dead && pa_iochannel_is_readable(l->io)) {
+        ssize_t r;
+        size_t len;
+
+        len = l->rbuf_length - l->rbuf_index - l->rbuf_valid_length;
+
+        /* Check if we have to enlarge the read buffer */
+        if (len < READ_SIZE) {
+            size_t n = l->rbuf_valid_length+READ_SIZE;
+
+            if (n >= BUFFER_LIMIT)
+                n = BUFFER_LIMIT;
+
+            if (l->rbuf_length >= n) {
+                /* The current buffer is large enough, let's just move the data to the front */
+                if (l->rbuf_valid_length)
+                    memmove(l->rbuf, l->rbuf+l->rbuf_index, l->rbuf_valid_length);
+            } else {
+                /* Enlarge the buffer */
+                char *new = pa_xnew(char, (unsigned) n);
+                if (l->rbuf_valid_length)
+                    memcpy(new, l->rbuf+l->rbuf_index, l->rbuf_valid_length);
+                pa_xfree(l->rbuf);
+                l->rbuf = new;
+                l->rbuf_length = n;
+            }
+
+            l->rbuf_index = 0;
+        }
+
+        len = l->rbuf_length - l->rbuf_index - l->rbuf_valid_length;
+
+        pa_assert(len >= READ_SIZE);
+
+        /* Read some data */
+        if ((r = pa_iochannel_read(l->io, l->rbuf+l->rbuf_index+l->rbuf_valid_length, len)) <= 0) {
+
+            if (r < 0 && errno == EAGAIN)
+                return 0;
+
+            if (r < 0 && errno != ECONNRESET) {
+                pa_log("read(): %s", pa_cstrerror(errno));
+                failure(l, false);
+            } else
+                failure(l, true);
+
+            return -1;
+        }
+
+        l->rbuf_valid_length += (size_t) r;
+
+        /* Look if a line has been terminated in the newly read data */
+        scan_for_lines(l, l->rbuf_valid_length - (size_t) r);
+    }
+
+    return 0;
+}
+
+/* Try to flush the buffer */
+static int do_write(pa_ioline *l) {
+    ssize_t r;
+
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+
+    while (l->io && !l->dead && pa_iochannel_is_writable(l->io) && l->wbuf_valid_length > 0) {
+
+        if ((r = pa_iochannel_write(l->io, l->wbuf+l->wbuf_index, l->wbuf_valid_length)) < 0) {
+
+            if (errno != EPIPE)
+                pa_log("write(): %s", pa_cstrerror(errno));
+
+            failure(l, false);
+
+            return -1;
+        }
+
+        l->wbuf_index += (size_t) r;
+        l->wbuf_valid_length -= (size_t) r;
+
+        /* A shortcut for the next time */
+        if (l->wbuf_valid_length == 0)
+            l->wbuf_index = 0;
+    }
+
+    if (l->wbuf_valid_length <= 0 && l->drain_callback)
+        l->drain_callback(l, l->drain_userdata);
+
+    return 0;
+}
+
+/* Try to flush read/write data */
+static void do_work(pa_ioline *l) {
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+
+    pa_ioline_ref(l);
+
+    l->mainloop->defer_enable(l->defer_event, 0);
+
+    if (!l->dead)
+        do_read(l);
+
+    if (!l->dead)
+        do_write(l);
+
+    if (l->defer_close && !l->wbuf_valid_length)
+        failure(l, true);
+
+    pa_ioline_unref(l);
+}
+
+static void io_callback(pa_iochannel*io, void *userdata) {
+    pa_ioline *l = userdata;
+
+    pa_assert(io);
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+
+    do_work(l);
+}
+
+static void defer_callback(pa_mainloop_api*m, pa_defer_event*e, void *userdata) {
+    pa_ioline *l = userdata;
+
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+    pa_assert(l->mainloop == m);
+    pa_assert(l->defer_event == e);
+
+    do_work(l);
+}
+
+void pa_ioline_defer_close(pa_ioline *l) {
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+
+    l->defer_close = true;
+
+    if (!l->wbuf_valid_length)
+        l->mainloop->defer_enable(l->defer_event, 1);
+}
+
+void pa_ioline_printf(pa_ioline *l, const char *format, ...) {
+    char *t;
+    va_list ap;
+
+    pa_assert(l);
+    pa_assert(PA_REFCNT_VALUE(l) >= 1);
+
+    va_start(ap, format);
+    t = pa_vsprintf_malloc(format, ap);
+    va_end(ap);
+
+    pa_ioline_puts(l, t);
+    pa_xfree(t);
+}
+
+pa_iochannel* pa_ioline_detach_iochannel(pa_ioline *l) {
+    pa_iochannel *r;
+
+    pa_assert(l);
+
+    if (!l->io)
+        return NULL;
+
+    r = l->io;
+    l->io = NULL;
+
+    pa_iochannel_set_callback(r, NULL, NULL);
+
+    return r;
+}
+
+bool pa_ioline_is_drained(pa_ioline *l) {
+    pa_assert(l);
+
+    return l->wbuf_valid_length <= 0;
+}