main part of the native protocol

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@31 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/pdispatch.c

@@ -0,0 +1,149 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include "pdispatch.h"
+#include "protocol-native-spec.h"
+
+struct reply_info {
+    struct pdispatch *pdispatch;
+    struct reply_info *next, *previous;
+    int (*callback)(struct pdispatch *pd, uint32_t command, uint32_t tag, struct tagstruct *t, void *userdata);
+    void *userdata;
+    uint32_t tag;
+    void *mainloop_timeout;
+};
+
+struct pdispatch {
+    struct pa_mainloop_api *mainloop;
+    const struct pdispatch_command *command_table;
+    unsigned n_commands;
+    struct reply_info *replies;
+};
+
+static void reply_info_free(struct reply_info *r) {
+    assert(r && r->pdispatch && r->pdispatch->mainloop);
+    r->pdispatch->mainloop->cancel_time(r->pdispatch->mainloop, r->mainloop_timeout);
+
+    if (r->previous)
+        r->previous->next = r->next;
+    else
+        r->pdispatch->replies = r->next;
+
+    if (r->next)
+        r->next->previous = r->previous;
+    
+    free(r);
+}
+
+struct pdispatch* pdispatch_new(struct pa_mainloop_api *mainloop, const struct pdispatch_command*table, unsigned entries) {
+    struct pdispatch *pd;
+    assert(mainloop);
+
+    assert((entries && table) || (!entries && !table));
+    
+    pd = malloc(sizeof(struct pdispatch));
+    assert(pd);
+    pd->mainloop = mainloop;
+    pd->command_table = table;
+    pd->n_commands = entries;
+    return pd;
+}
+
+void pdispatch_free(struct pdispatch *pd) {
+    assert(pd);
+    while (pd->replies)
+        reply_info_free(pd->replies);
+    free(pd);
+}
+
+int pdispatch_run(struct pdispatch *pd, struct packet*packet, void *userdata) {
+    uint32_t tag, command;
+    assert(pd && packet);
+    struct tagstruct *ts = NULL;
+    assert(pd && packet && packet->data);
+
+    if (packet->length <= 8)
+        goto fail;
+
+    ts = tagstruct_new(packet->data, packet->length);
+    assert(ts);
+    
+    if (tagstruct_getu32(ts, &command) < 0 ||
+        tagstruct_getu32(ts, &tag) < 0)
+        goto fail;
+
+    if (command == PA_COMMAND_ERROR || command == PA_COMMAND_REPLY) {
+        struct reply_info *r;
+        int done = 0;
+
+        for (r = pd->replies; r; r = r->next) {
+            if (r->tag == tag) {
+                int ret = r->callback(r->pdispatch, command, tag, ts, r->userdata);
+                reply_info_free(r);
+                
+                if (ret < 0)
+                    goto fail;
+                
+                done = 1;
+                break;
+            }
+        }
+
+        if (!done)
+            goto fail;
+
+    } else if (pd->command_table && command < pd->n_commands) {
+        const struct pdispatch_command *c = pd->command_table+command;
+
+        if (!c->proc)
+            goto fail;
+        
+        if (c->proc(pd, command, tag, ts, userdata) < 0)
+            goto fail;
+    } else
+        goto fail;
+    
+    tagstruct_free(ts);    
+        
+    return 0;
+
+fail:
+    if (ts)
+        tagstruct_free(ts);    
+
+    fprintf(stderr, "protocol-native: invalid packet.\n");
+    return -1;
+}
+
+static void timeout_callback(struct pa_mainloop_api*m, void *id, const struct timeval *tv, void *userdata) {
+    struct reply_info*r = userdata;
+    assert (r && r->mainloop_timeout == id && r->pdispatch && r->pdispatch->mainloop == m && r->callback);
+
+    r->callback(r->pdispatch, PA_COMMAND_TIMEOUT, r->tag, NULL, r->userdata);
+    reply_info_free(r);
+}
+
+void pdispatch_register_reply(struct pdispatch *pd, uint32_t tag, int timeout, int (*cb)(struct pdispatch *pd, uint32_t command, uint32_t tag, struct tagstruct *t, void *userdata), void *userdata) {
+    struct reply_info *r;
+    struct timeval tv;
+    assert(pd && cb);
+
+    r = malloc(sizeof(struct reply_info));
+    assert(r);
+    r->pdispatch = pd;
+    r->callback = cb;
+    r->userdata = userdata;
+    r->tag = tag;
+
+    gettimeofday(&tv, NULL);
+    tv.tv_sec += timeout;
+
+    r->mainloop_timeout = pd->mainloop->source_time(pd->mainloop, &tv, timeout_callback, r);
+    assert(r->mainloop_timeout);
+
+    r->previous = NULL;
+    r->next = pd->replies;
+    if (r->next)
+        r->next->previous = r;
+    pd->replies = r;
+}