Mesa (master): gallium/auxiliary: add dynamically sized buffer/array/vector
Luca Barbieri
lb at kemper.freedesktop.org
Mon Apr 12 21:53:20 UTC 2010
Module: Mesa
Branch: master
Commit: 6cd82eb399c8a6c248c2d9b135bafefbac8fbe0f
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=6cd82eb399c8a6c248c2d9b135bafefbac8fbe0f
Author: Luca Barbieri <luca at luca-barbieri.com>
Date: Thu Feb 25 13:11:12 2010 +0100
gallium/auxiliary: add dynamically sized buffer/array/vector
---
src/gallium/auxiliary/util/u_buffer.h | 57 +++++++++++++++++++++++++++++++++
1 files changed, 57 insertions(+), 0 deletions(-)
diff --git a/src/gallium/auxiliary/util/u_buffer.h b/src/gallium/auxiliary/util/u_buffer.h
new file mode 100644
index 0000000..5eb53bc
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_buffer.h
@@ -0,0 +1,57 @@
+#ifndef U_BUFFER_H
+#define U_BUFFER_H
+
+struct util_buffer
+{
+ void* data;
+ unsigned size;
+ unsigned capacity;
+};
+
+static inline void
+util_buffer_init(struct util_buffer* buf)
+{
+ memset(buf, 0, sizeof(*buf));
+}
+
+static inline void
+util_buffer_fini(struct util_buffer* buf)
+{
+ if(buf->data) {
+ free(buf->data);
+ util_buffer_init(buf);
+ }
+}
+
+static inline void*
+util_buffer_grow(struct util_buffer* buf, int size)
+{
+ unsigned newsize = buf->size + size;
+ char* p;
+ if(newsize > buf->capacity) {
+ buf->capacity <<= 1;
+ if(newsize > buf->capacity)
+ buf->capacity = newsize;
+ buf->data = realloc(buf->data, buf->capacity);
+ }
+
+ p = (char*)buf->data + buf->size;
+ buf->size = newsize;
+ return p;
+}
+
+static inline void
+util_buffer_trim(struct util_buffer* buf)
+{
+ buf->data = realloc(buf->data, buf->size);
+ buf->capacity = buf->size;
+}
+
+#define util_buffer_append(buf, type, v) do {type __v = (v); memcpy(util_buffer_grow((buf), sizeof(type)), &__v, sizeof(type));} while(0)
+#define util_buffer_top_ptr(buf, type) (type*)((buf)->data + (buf)->size - sizeof(type))
+#define util_buffer_top(buf, type) *util_buffer_top_ptr(buf, type)
+#define util_buffer_pop_ptr(buf, type) (type*)((buf)->data + ((buf)->size -= sizeof(type)))
+#define util_buffer_pop(buf, type) *util_buffer_pop_ptr(buf, type)
+#define util_buffer_contains(buf, type) ((buf)->size >= sizeof(type))
+
+#endif /* U_BUFFER_H */
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