add encode and decode functions

src/util/inc/tcoding.h

+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program 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.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _TD_CODING_H_
+#define _TD_CODING_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <string.h>
+
+#include "tutil.h"
+
+const int TNUMBER = 1;
+#define IS_LITTLE_ENDIAN() (*(char *)(&TNUMBER) != 0)
+
+static FORCE_INLINE void *taosEncodeFixed16(void *buf, uint16_t value) {
+  if (IS_LITTLE_ENDIAN()) {
+    memcpy(buf, &value, sizeof(value));
+  } else {
+    ((char *)buf)[0] = value & 0xff;
+    ((char *)buf)[1] = (value >> 8) & 0xff;
+  }
+
+  return POINTER_DRIFT(buf, sizeof(value));
+}
+
+static FORCE_INLINE void *taosEncodeFixed32(void *buf, uint32_t value) {
+  if (IS_LITTLE_ENDIAN()) {
+    memcpy(buf, &value, sizeof(value));
+  } else {
+    ((char *)buf)[0] = value & 0xff;
+    ((char *)buf)[1] = (value >> 8) & 0xff;
+    ((char *)buf)[2] = (value >> 16) & 0xff;
+    ((char *)buf)[3] = (value >> 24) & 0xff;
+  }
+
+  return POINTER_DRIFT(buf, sizeof(value));
+}
+
+static FORCE_INLINE void *taosEncodeFixed64(void *buf, uint64_t value) {
+  if (IS_LITTLE_ENDIAN()) {
+    memcpy(buf, &value, sizeof(value));
+  } else {
+    ((char *)buf)[0] = value & 0xff;
+    ((char *)buf)[1] = (value >> 8) & 0xff;
+    ((char *)buf)[2] = (value >> 16) & 0xff;
+    ((char *)buf)[3] = (value >> 24) & 0xff;
+    ((char *)buf)[4] = (value >> 32) & 0xff;
+    ((char *)buf)[5] = (value >> 40) & 0xff;
+    ((char *)buf)[6] = (value >> 48) & 0xff;
+    ((char *)buf)[7] = (value >> 56) & 0xff;
+  }
+
+  return POINTER_DRIFT(buf, sizeof(value));
+}
+
+static FORCE_INLINE void *taosDecodeFixed16(void *buf, uint16_t *value) {
+  if (IS_LITTLE_ENDIAN()) {
+    memcpy(value, buf, sizeof(*value));
+  } else {
+    ((char *)value)[1] = ((char *)buf)[0];
+    ((char *)value)[0] = ((char *)buf)[1];
+  }
+
+  return POINTER_DRIFT(buf, sizeof(*value));
+}
+
+static FORCE_INLINE void *taosDecodeFixed32(void *buf, uint32_t *value) {
+  if (IS_LITTLE_ENDIAN()) {
+    memcpy(value, buf, sizeof(*value));
+  } else {
+    ((char *)value)[3] = ((char *)buf)[0];
+    ((char *)value)[2] = ((char *)buf)[1];
+    ((char *)value)[1] = ((char *)buf)[2];
+    ((char *)value)[0] = ((char *)buf)[3];
+  }
+
+  return POINTER_DRIFT(buf, sizeof(*value));
+}
+
+static FORCE_INLINE void *taosDecodeFixed64(void *buf, uint64_t *value) {
+  if (IS_LITTLE_ENDIAN()) {
+    memcpy(value, buf, sizeof(*value));
+  } else {
+    ((char *)value)[7] = ((char *)buf)[0];
+    ((char *)value)[6] = ((char *)buf)[1];
+    ((char *)value)[5] = ((char *)buf)[2];
+    ((char *)value)[4] = ((char *)buf)[3];
+    ((char *)value)[3] = ((char *)buf)[4];
+    ((char *)value)[2] = ((char *)buf)[5];
+    ((char *)value)[1] = ((char *)buf)[6];
+    ((char *)value)[0] = ((char *)buf)[7];
+  }
+
+  return POINTER_DRIFT(buf, sizeof(*value));
+}
+
+// TODO
+static FORCE_INLINE void *taosEncodeVariant16(void *buf, uint16_t value) {}
+static FORCE_INLINE void *taosEncodeVariant32(void *buf, uint32_t value) {}
+static FORCE_INLINE void *taosEncodeVariant64(void *buf, uint64_t value) {}
+static FORCE_INLINE void *taosDecodeVariant16(void *buf, uint16_t *value) {}
+static FORCE_INLINE void *taosDecodeVariant32(void *buf, uint32_t *value) {}
+static FORCE_INLINE void *taosDecodeVariant64(void *buf, uint64_t *value) {}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
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