glsl: Introduce sl_pp_context and maintain a reuseable pool of strings.

1 files changed, 77 insertions, 0 deletions

diff --git a/src/glsl/pp/sl_pp_context.c b/src/glsl/pp/sl_pp_context.c
new file mode 100644
index 0000000000..71712de1fe
--- /dev/null
+++ b/src/glsl/pp/sl_pp_context.c
@@ -0,0 +1,77 @@
+/**************************************************************************
+ * 
+ * Copyright 2009 VMware, Inc.
+ * All Rights Reserved.
+ * 
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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 "sl_pp_context.h"
+
+
+void
+sl_pp_context_init(struct sl_pp_context *context)
+{
+   memset(context, 0, sizeof(struct sl_pp_context));
+}
+
+void
+sl_pp_context_destroy(struct sl_pp_context *context)
+{
+   free(context->cstr_pool);
+}
+
+int
+sl_pp_context_add_str(struct sl_pp_context *context,
+                      const char *str)
+{
+   unsigned int size;
+   unsigned int offset;
+
+   size = strlen(str) + 1;
+
+   if (context->cstr_pool_len + size > context->cstr_pool_max) {
+      context->cstr_pool_max = (context->cstr_pool_len + size + 0xffff) & ~0xffff;
+      context->cstr_pool = realloc(context->cstr_pool, context->cstr_pool_max);
+   }
+
+   if (!context->cstr_pool) {
+      return -1;
+   }
+
+   offset = context->cstr_pool_len;
+   memcpy(&context->cstr_pool[offset], str, size);
+   context->cstr_pool_len += size;
+
+   return offset;
+}
+
+const char *
+sl_pp_context_cstr(const struct sl_pp_context *context,
+                   int offset)
+{
+   if (offset == -1) {
+      return NULL;
+   }
+   return &context->cstr_pool[offset];
+}