evas/cserve2: Fix NULL vs. empty string

Server side: Some strings were NULL, some other were empty.
Client side was looking for NULL, but the shared index contained
empty key.

src/bin/evas/evas_cserve2_cache.c

@@ -197,7 +197,6 @@ _entry_load_reused(Entry *e)
 #endif
 }
 
-
 static int
 _shm_object_id_cmp_cb(const void *data1, const void *data2)
 {
@@ -545,7 +544,7 @@ _font_loaded_send(Client *client, unsigned int rid)
 static void *
 _open_request_build(Entry *entry, int *bufsize)
 {
-   const char *loader_data;
+   const char *loader_data, *key, *path;
    char *buf;
    int size, pathlen, keylen, loaderlen;
    Slave_Msg_Image_Open msg;
@@ -561,8 +560,12 @@ _open_request_build(Entry *entry, int *bufsize)
         return NULL;
      }
 
-   pathlen = strlen(cserve2_shared_string_get(fd->path)) + 1;
-   keylen = strlen(cserve2_shared_string_get(fd->key)) + 1;
+   path = cserve2_shared_string_get(fd->path);
+   key = cserve2_shared_string_get(fd->key);
+   if (!path) path = "";
+   if (!key) key = "";
+   pathlen = strlen(path) + 1;
+   keylen = strlen(key) + 1;
 
    memset(&msg, 0, sizeof(msg));
    loader_data = cserve2_shared_string_get(fd->loader_data);
@@ -574,8 +577,8 @@ _open_request_build(Entry *entry, int *bufsize)
    if (!buf) return NULL;
 
    memcpy(buf, &msg, sizeof(msg));
-   memcpy(buf + sizeof(msg), cserve2_shared_string_get(fd->path), pathlen);
-   memcpy(buf + sizeof(msg) + pathlen, cserve2_shared_string_get(fd->key), keylen);
+   memcpy(buf + sizeof(msg), path, pathlen);
+   memcpy(buf + sizeof(msg) + pathlen, key, keylen);
    if (msg.has_loader_data)
      memcpy(buf + sizeof(msg) + pathlen + keylen, loader_data, loaderlen);
 
@@ -661,7 +664,7 @@ static void *
 _load_request_build(Image_Entry *ientry, int *bufsize)
 {
    char *buf, *ptr;
-   const char *shmpath, *loader_data;
+   const char *shmpath, *loader_data, *path, *key;
    int size;
    int shmlen, filelen, keylen, loaderlen;
    Slave_Msg_Image_Load msg;
@@ -686,8 +689,12 @@ _load_request_build(Image_Entry *ientry, int *bufsize)
 
    shmpath = cserve2_shm_name_get(ientry->shm);
    shmlen = strlen(shmpath) + 1;
-   filelen = strlen(cserve2_shared_string_get(fd->path)) + 1;
-   keylen = strlen(cserve2_shared_string_get(fd->key)) + 1;
+   path = cserve2_shared_string_get(fd->path);
+   key = cserve2_shared_string_get(fd->key);
+   if (!path) path = "";
+   if (!key) key = "";
+   filelen = strlen(path) + 1;
+   keylen = strlen(key) + 1;
    loader_data = cserve2_shared_string_get(fd->loader_data);
    if (loader_data)
      loaderlen = strlen(loader_data) + 1;
@@ -724,11 +731,12 @@ _load_request_build(Image_Entry *ientry, int *bufsize)
 
    memcpy(ptr, shmpath, shmlen);
    ptr += shmlen;
-   memcpy(ptr, cserve2_shared_string_get(fd->path), filelen);
+   memcpy(ptr, path, filelen);
    ptr += filelen;
-   memcpy(ptr, cserve2_shared_string_get(fd->key), keylen);
+   memcpy(ptr, key, keylen);
    ptr += keylen;
-   if (loaderlen > 0) memcpy(ptr, cserve2_shared_string_get(fd->loader_data), loaderlen);
+   if (loaderlen > 0)
+     memcpy(ptr, loader_data, loaderlen);
 
    *bufsize = size;
 

src/bin/evas/evas_cserve2_index.c

@@ -921,7 +921,7 @@ cserve2_shared_string_add(const char *str)
    char *data;
    int len, id;
 
-   if (!str) return -1;
+   if (!str) return 0;
 
    // Find in known strings
    id = (int) (intptr_t) eina_hash_find(_string_entries, str);
@@ -945,7 +945,7 @@ new_entry:
    if (!ie)
      {
         ERR("Could not store new string in shm");
-        return -1;
+        return 0;
      }
 
    data = _string_mempool->ds->data + ie->offset;
@@ -957,7 +957,7 @@ new_entry:
 int
 cserve2_shared_string_ref(int id)
 {
-   if (!id) return 0;
+   if (id <= 0) return 0;
    return cserve2_shared_mempool_buffer_ref(_string_mempool, id);
 }
 
@@ -966,7 +966,7 @@ cserve2_shared_string_del(int id)
 {
    const char *data;
 
-   if (!id) return;
+   if (id <= 0) return;
    if ((data = _shared_mempool_buffer_del(_string_mempool, id)) != NULL)
      {
         if (!eina_hash_del_by_key(_string_entries, data))
@@ -980,7 +980,7 @@ cserve2_shared_string_del(int id)
 const char *
 cserve2_shared_string_get(int id)
 {
-   if (!id) return NULL;
+   if (id <= 0) return NULL;
    return cserve2_shared_mempool_buffer_get(_string_mempool, id);
 }
 

src/bin/evas/evas_cserve2_main.c

@@ -135,15 +135,17 @@ static void
 _cserve2_client_open(Client *client)
 {
    Msg_Open *msg = (Msg_Open *)client->msg.buf;
-   const char *path, *key;
+   const char *path, *key, *end;
 
    path = ((const char *)msg) + sizeof(*msg) + msg->path_offset;
    key = ((const char *)msg) + sizeof(*msg) + msg->key_offset;
+   end = key + strlen(key) + 1;
 
    INF("Received OPEN command: RID=%d", msg->base.rid);
    INF("File_ID: %d, path=\"%s\", key=\"%s\", has_load_opts=%d",
        msg->file_id, path, key, (int) msg->has_load_opts);
 
+   if (!key[0]) key = NULL;
    cserve2_cache_file_open(client, msg->file_id, path, key, msg->base.rid);
 
    if (!msg->has_load_opts)
@@ -152,8 +154,7 @@ _cserve2_client_open(Client *client)
    else
      {
         // FIXME: Check message size first?
-        Evas_Image_Load_Opts *opts =
-              (Evas_Image_Load_Opts*) (key + strlen(key) + 1);
+        Evas_Image_Load_Opts *opts = (Evas_Image_Load_Opts *) end;
 
         DBG("Load Options:");
         DBG("\tdpi: %03.1f", opts->dpi);