Move examples into subfolders, add READMEs

1 files changed, 131 insertions, 0 deletions

diff --git a/examples/network_server/server.c b/examples/network_server/server.c
new file mode 100644
index 00000000..9a9c2644
--- /dev/null
+++ b/examples/network_server/server.c
@@ -0,0 +1,131 @@
+/* This is a simple TCP server that listens on port 1234 and provides lists
+ * of files to clients, using a protocol defined in file_server.proto.
+ *
+ * It directly deserializes and serializes messages from network, minimizing
+ * memory use.
+ * 
+ * For flexibility, this example is implemented using posix api.
+ * In a real embedded system you would typically use some other kind of
+ * a communication and filesystem layer.
+ */
+
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <pb_encode.h>
+#include <pb_decode.h>
+
+#include "fileproto.pb.h"
+#include "common.h"
+
+bool listdir_callback(pb_ostream_t *stream, const pb_field_t *field, void * const *arg)
+{
+    DIR *dir = (DIR*) *arg;
+    struct dirent *file;
+    FileInfo fileinfo;
+    
+    while ((file = readdir(dir)) != NULL)
+    {
+        fileinfo.inode = file->d_ino;
+        strncpy(fileinfo.name, file->d_name, sizeof(fileinfo.name));
+        fileinfo.name[sizeof(fileinfo.name) - 1] = '\0';
+        
+        if (!pb_encode_tag_for_field(stream, field))
+            return false;
+        
+        if (!pb_encode_submessage(stream, FileInfo_fields, &fileinfo))
+            return false;
+    }
+    
+    return true;
+}
+
+void handle_connection(int connfd)
+{
+    ListFilesRequest request;
+    ListFilesResponse response;
+    pb_istream_t input = pb_istream_from_socket(connfd);
+    pb_ostream_t output = pb_ostream_from_socket(connfd);
+    DIR *directory;
+    
+    if (!pb_decode(&input, ListFilesRequest_fields, &request))
+    {
+        printf("Decode failed: %s\n", PB_GET_ERROR(&input));
+        return;
+    }
+    
+    directory = opendir(request.path);
+    
+    printf("Listing directory: %s\n", request.path);
+    
+    if (directory == NULL)
+    {
+        perror("opendir");
+        
+        response.has_path_error = true;
+        response.path_error = true;
+        response.file.funcs.encode = NULL;
+    }
+    else
+    {
+        response.has_path_error = false;
+        response.file.funcs.encode = &listdir_callback;
+        response.file.arg = directory;
+    }
+    
+    if (!pb_encode(&output, ListFilesResponse_fields, &response))
+    {
+        printf("Encoding failed.\n");
+    }
+}
+
+int main(int argc, char **argv)
+{
+    int listenfd, connfd;
+    struct sockaddr_in servaddr;
+    int reuse = 1;
+    
+    listenfd = socket(AF_INET, SOCK_STREAM, 0);
+    
+    setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
+    
+    memset(&servaddr, 0, sizeof(servaddr));
+    servaddr.sin_family = AF_INET;
+    servaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+    servaddr.sin_port = htons(1234);
+    if (bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) != 0)
+    {
+        perror("bind");
+        return 1;
+    }
+    
+    if (listen(listenfd, 5) != 0)
+    {
+        perror("listen");
+        return 1;
+    }
+    
+    for(;;)
+    {
+        connfd = accept(listenfd, NULL, NULL);
+        
+        if (connfd < 0)
+        {
+            perror("accept");
+            return 1;
+        }
+        
+        printf("Got connection.\n");
+        
+        handle_connection(connfd);
+        
+        printf("Closing connection.\n");
+        
+        close(connfd);
+    }
+}