1 files changed, 116 insertions, 0 deletions
diff --git a/src/buffer.h b/src/buffer.h
new file mode 100644
index 0000000..ab46f9b
--- /dev/null
+++ b/src/buffer.h
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2019-2021 OARC, Inc.
+ * Copyright 2017-2018 Akamai Technologies
+ * Copyright 2006-2016 Nominum, Inc.
+ * All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef PERF_BUFFER_H
+#define PERF_BUFFER_H 1
+
+#include <stddef.h>
+
+typedef struct perf_region {
+    void*  base;
+    size_t length;
+} perf_region_t;
+
+typedef struct perf_buffer {
+    void*  base;
+    size_t length, used, current, active;
+} perf_buffer_t;
+
+#include <assert.h>
+
+#define perf_buffer_init(b, _base, _length) \
+    {                                       \
+        (b)->base    = _base;               \
+        (b)->length  = _length;             \
+        (b)->used    = 0;                   \
+        (b)->current = 0;                   \
+        (b)->active  = 0;                   \
+    }
+
+#define perf_buffer_add(b, n)                 \
+    {                                         \
+        assert((b)->used + n <= (b)->length); \
+        (b)->used += (n);                     \
+    }
+
+#define perf_buffer_length(b) ((b)->length)
+
+#define perf_buffer_availablelength(b) ((b)->length - (b)->used)
+
+#define perf_buffer_base(b) ((b)->base)
+
+#define perf_buffer_clear(b) \
+    {                        \
+        (b)->used    = 0;    \
+        (b)->current = 0;    \
+        (b)->active  = 0;    \
+    }
+
+#define perf_buffer_putmem(b, base, length)               \
+    {                                                     \
+        assert(perf_buffer_availablelength(b) >= length); \
+        memcpy(perf_buffer_used(b), base, length);        \
+        perf_buffer_add(b, length);                       \
+    }
+
+#define perf_buffer_putuint8(b, _val)                 \
+    {                                                 \
+        unsigned char* _cp;                           \
+        uint8_t        _val2 = (_val);                \
+        assert(perf_buffer_availablelength(b) >= 1U); \
+        _cp = perf_buffer_used(b);                    \
+        (b)->used += 1U;                              \
+        _cp[0] = _val2;                               \
+    }
+
+#define perf_buffer_putuint16(b, _val)                \
+    {                                                 \
+        unsigned char* _cp;                           \
+        uint16_t       _val2 = (_val);                \
+        assert(perf_buffer_availablelength(b) >= 2U); \
+        _cp = perf_buffer_used(b);                    \
+        (b)->used += 2U;                              \
+        _cp[0] = _val2 >> 8;                          \
+        _cp[1] = _val2;                               \
+    }
+
+#define perf_buffer_putuint32(b, _val)                \
+    {                                                 \
+        unsigned char* _cp;                           \
+        uint32_t       _val2 = (_val);                \
+        assert(perf_buffer_availablelength(b) >= 4U); \
+        _cp = perf_buffer_used(b);                    \
+        (b)->used += 4U;                              \
+        _cp[0] = _val2 >> 24;                         \
+        _cp[1] = _val2 >> 16;                         \
+        _cp[2] = _val2 >> 8;                          \
+        _cp[3] = _val2;                               \
+    }
+
+#define perf_buffer_copyregion(b, r) perf_buffer_putmem(b, (r)->base, (r)->length)
+
+#define perf_buffer_used(b) ((void*)((unsigned char*)(b)->base + (b)->used))
+#define perf_buffer_usedlength(b) ((b)->used)
+#define perf_buffer_usedregion(b, r) \
+    {                                \
+        (r)->base   = (b)->base;     \
+        (r)->length = (b)->used;     \
+    }
+
+#endif