Work on marshalling

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 96 insertions, 0 deletions

diff --git a/src/ramps.c b/src/ramps.c
new file mode 100644
index 0000000..2c24b52
--- /dev/null
+++ b/src/ramps.c
@@ -0,0 +1,96 @@
+/**
+ * gammad -- Cooperative gamma server
+ * Copyright (C) 2016  Mattias Andrée (maandree@kth.se)
+ * 
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "ramps.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
+/**
+ * The name of the process
+ */
+extern char* argv0;
+
+
+
+/**
+ * Marshal a ramp trio
+ * 
+ * @param   this        The ramps
+ * @param   buf         Output buffer for the marshalled ramps,
+ *                      `NULL` just measure how large the buffers
+ *                      needs to be
+ * @param   ramps_size  The byte-size of ramps
+ * @return              The number of marshalled byte
+ */
+size_t gamma_ramps_marshal(const union gamma_ramps* this, char* buf, size_t ramps_size)
+{
+  if (buf != NULL)
+    memcpy(buf, this->u8.red, ramps_size);
+  return ramps_size;
+}
+
+
+/**
+ * Unmarshal a ramp trio
+ * 
+ * @param   this        Output for the ramps, `.red_size`, `.green_size`,
+ *                      and `.blue_size` must already be set
+ * @param   buf         Buffer with the marshalled ramps
+ * @param   ramps_size  The byte-size of ramps
+ * @return              The number of unmarshalled bytes, 0 on error
+ */
+size_t gamma_ramps_unmarshal(union gamma_ramps* this, const char* buf, size_t ramps_size)
+{
+  size_t depth = ramps_size / (this->u8.red_size + this->u8.green_size + this->u8.blue_size);
+  int r = 0;
+  switch (depth)
+    {
+    case 1:
+      r = libgamma_gamma_ramps8_initialise(&(this->u8));
+      break;
+    case 2:
+      r = libgamma_gamma_ramps16_initialise(&(this->u16));
+      break;
+    case 4:
+      r = libgamma_gamma_ramps32_initialise(&(this->u32));
+      break;
+    case 8:
+      r = libgamma_gamma_ramps64_initialise(&(this->u64));
+      break;
+    default:
+      if (depth == sizeof(float))
+	r = libgamma_gamma_rampsf_initialise(&(this->f));
+      else if (depth == sizeof(double))
+	r = libgamma_gamma_rampsd_initialise(&(this->d));
+      else
+	abort();
+      break;
+    }
+  if (r)
+    {
+      libgamma_perror(argv0, r);
+      errno = 0;
+      return 0;
+    }
+  memcpy(this->u8.red, buf, ramps_size);
+  return ramps_size;
+}
+