added raw tcp support

Originally committed as revision 717 to svn://svn.ffmpeg.org/ffmpeg/trunk

libav/tcp.c

+/*
+ * TCP protocol
+ * Copyright (c) 2002 Fabrice Bellard.
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avformat.h"
+#include <unistd.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+
+typedef struct TCPContext {
+    int fd;
+} TCPContext;
+
+/* resolve host with also IP address parsing */
+int resolve_host(struct in_addr *sin_addr, const char *hostname)
+{
+    struct hostent *hp;
+
+    if ((inet_aton(hostname, sin_addr)) == 0) {
+        hp = gethostbyname(hostname);
+        if (!hp)
+            return -1;
+        memcpy (sin_addr, hp->h_addr, sizeof(struct in_addr));
+    }
+    return 0;
+}
+
+/* return non zero if error */
+static int tcp_open(URLContext *h, const char *uri, int flags)
+{
+    struct sockaddr_in dest_addr;
+    char hostname[1024], *q;
+    int port, fd = -1;
+    TCPContext *s;
+    const char *p;
+
+    s = av_malloc(sizeof(TCPContext));
+    if (!s)
+        return -ENOMEM;
+    h->priv_data = s;
+    p = uri;
+    if (!strstart(p, "tcp://", &p))
+        goto fail;
+    q = hostname;
+    while (*p != ':' && *p != '/' && *p != '\0') {
+        if ((q - hostname) < sizeof(hostname) - 1)
+            *q++ = *p;
+        p++;
+    }
+    *q = '\0';
+    if (*p != ':')
+        goto fail;
+    p++;
+    port = strtoul(p, (char **)&p, 10);
+    if (port <= 0 || port >= 65536)
+        goto fail;
+    
+    dest_addr.sin_family = AF_INET;
+    dest_addr.sin_port = htons(port);
+    if (resolve_host(&dest_addr.sin_addr, hostname) < 0)
+        goto fail;
+
+    fd = socket(PF_INET, SOCK_STREAM, 0);
+    if (fd < 0)
+        goto fail;
+
+    if (connect(fd, (struct sockaddr *)&dest_addr, 
+                sizeof(dest_addr)) < 0)
+        goto fail;
+
+    s->fd = fd;
+    return 0;
+
+ fail:
+    if (fd >= 0)
+        close(fd);
+    av_free(s);
+    return -EIO;
+}
+
+static int tcp_read(URLContext *h, UINT8 *buf, int size)
+{
+    TCPContext *s = h->priv_data;
+    int size1, len;
+
+    size1 = size;
+    while (size > 0) {
+        len = read (s->fd, buf, size);
+        if (len < 0) {
+            if (errno != EINTR && errno != EAGAIN)
+                return -errno;
+            else
+                continue;
+        } else if (len == 0) {
+            break;
+        }
+        size -= len;
+        buf += len;
+    }
+    return size1 - size;
+}
+
+static int tcp_write(URLContext *h, UINT8 *buf, int size)
+{
+    TCPContext *s = h->priv_data;
+    int ret, size1;
+
+    size1 = size;
+    while (size > 0) {
+        ret = write (s->fd, buf, size);
+        if (ret < 0 && errno != EINTR && errno != EAGAIN)
+            return -errno;
+        size -= ret;
+        buf += ret;
+    }
+    return size1 - size;
+}
+
+static int tcp_close(URLContext *h)
+{
+    TCPContext *s = h->priv_data;
+    close(s->fd);
+    av_free(s);
+    return 0;
+}
+
+URLProtocol tcp_protocol = {
+    "tcp",
+    tcp_open,
+    tcp_read,
+    tcp_write,
+    NULL, /* seek */
+    tcp_close,
+};