libretro, add Pico pad overlay and storyware pages handling

platform/libretro/libretro-common/streams/trans_stream_pipe.c

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+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (trans_stream_pipe.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <streams/trans_stream.h>
+
+struct pipe_trans_stream
+{
+   const uint8_t *in;
+   uint8_t *out;
+   uint32_t in_size, out_size;
+};
+
+static void *pipe_stream_new(void)
+{
+   struct pipe_trans_stream *stream = 
+      (struct pipe_trans_stream*)malloc(sizeof(*stream));
+   if (!stream)
+      return NULL;
+
+   stream->in                       = NULL;
+   stream->out                      = NULL;
+   stream->in_size                  = 0;
+   stream->out_size                 = 0;
+
+   return stream;
+}
+
+static void pipe_stream_free(void *data)
+{
+   free(data);
+}
+
+static void pipe_set_in(void *data, const uint8_t *in, uint32_t in_size)
+{
+   struct pipe_trans_stream *p = (struct pipe_trans_stream *) data;
+
+   if (!p)
+      return;
+         
+   p->in                       = in;
+   p->in_size                  = in_size;
+}
+
+static void pipe_set_out(void *data, uint8_t *out, uint32_t out_size)
+{
+   struct pipe_trans_stream *p = (struct pipe_trans_stream *) data;
+   
+   if (!p)
+      return;
+
+   p->out                      = out;
+   p->out_size                 = out_size;
+}
+
+static bool pipe_trans(
+   void *data, bool flush,
+   uint32_t *rd, uint32_t *wn,
+   enum trans_stream_error *error)
+{
+   struct pipe_trans_stream *p = (struct pipe_trans_stream *) data;
+
+   if (p->out_size < p->in_size)
+   {
+      memcpy(p->out, p->in, p->out_size);
+      *rd     = *wn = p->out_size;
+      p->in  += p->out_size;
+      p->out += p->out_size;
+      *error  = TRANS_STREAM_ERROR_BUFFER_FULL;
+      return false;
+   }
+
+   memcpy(p->out, p->in, p->in_size);
+   *rd     = *wn = p->in_size;
+   p->in  += p->in_size;
+   p->out += p->in_size;
+   *error  = TRANS_STREAM_ERROR_NONE;
+   return true;
+}
+
+const struct trans_stream_backend pipe_backend = {
+   "pipe",
+   &pipe_backend,
+   pipe_stream_new,
+   pipe_stream_free,
+   NULL,
+   pipe_set_in,
+   pipe_set_out,
+   pipe_trans
+};