1 files changed, 124 insertions, 0 deletions
diff --git a/lib/util/bytearray.h b/lib/util/bytearray.h
new file mode 100644
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--- /dev/null
+++ b/lib/util/bytearray.h
@@ -0,0 +1,124 @@
+/*
+ * Macros for handling integer types in byte arrays
+ *
+ * This file is originally from the libssh.org project
+ *
+ * Copyright (c) 2018 Andreas Schneider <asn@cryptomilk.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#ifndef _BYTEARRAY_H
+#define _BYTEARRAY_H
+
+#define _DATA_BYTE_CONST(data, pos) \
+    ((uint8_t)(((const uint8_t *)(data))[(pos)]))
+
+#define _DATA_BYTE(data, pos) \
+    (((uint8_t *)(data))[(pos)])
+
+/*
+ * These macros pull or push integer values from byte arrays stored in
+ * little-endian byte order.
+ */
+#define PULL_LE_U8(data, pos) \
+    (_DATA_BYTE_CONST(data, pos))
+#define PULL_LE_I8(data, pos) \
+    (int8_t)PULL_LE_U8(data, pos)
+
+#define PULL_LE_U16(data, pos) \
+    ((uint16_t)PULL_LE_U8(data, pos) | ((uint16_t)(PULL_LE_U8(data, (pos) + 1))) << 8)
+#define PULL_LE_I16(data, pos) \
+    (int16_t)PULL_LE_U16(data, pos)
+
+#define PULL_LE_U32(data, pos) \
+    ((uint32_t)(PULL_LE_U16(data, pos) | ((uint32_t)PULL_LE_U16(data, (pos) + 2)) << 16))
+#define PULL_LE_I32(data, pos) \
+    (int32_t)PULL_LE_U32(data, pos)
+
+#define PULL_LE_U64(data, pos) \
+    ((uint64_t)(PULL_LE_U32(data, pos) | ((uint64_t)PULL_LE_U32(data, (pos) + 4)) << 32))
+#define PULL_LE_I64(data, pos) \
+    (int64_t)PULL_LE_U64(data, pos)
+
+
+#define PUSH_LE_U8(data, pos, val) \
+    (_DATA_BYTE(data, pos) = ((uint8_t)(val)))
+#define PUSH_LE_I8(data, pos, val) \
+    PUSH_LE_U8(data, pos, val)
+
+#define PUSH_LE_U16(data, pos, val) \
+    (PUSH_LE_U8((data), (pos), (uint8_t)((uint16_t)(val) & 0xff)), PUSH_LE_U8((data), (pos) + 1, (uint8_t)((uint16_t)(val) >> 8)))
+#define PUSH_LE_I16(data, pos, val) \
+    PUSH_LE_U16(data, pos, val)
+
+#define PUSH_LE_U32(data, pos, val) \
+    (PUSH_LE_U16((data), (pos), (uint16_t)((uint32_t)(val) & 0xffff)), PUSH_LE_U16((data), (pos) + 2, (uint16_t)((uint32_t)(val) >> 16)))
+#define PUSH_LE_I32(data, pos, val) \
+    PUSH_LE_U32(data, pos, val)
+
+#define PUSH_LE_U64(data, pos, val) \
+    (PUSH_LE_U32((data), (pos), (uint32_t)((uint64_t)(val) & 0xffffffff)), PUSH_LE_U32((data), (pos) + 4, (uint32_t)((uint64_t)(val) >> 32)))
+#define PUSH_LE_I64(data, pos, val) \
+    PUSH_LE_U64(data, pos, val)
+
+
+
+/*
+ * These macros pull or push integer values from byte arrays stored in
+ * big-endian byte order (network byte order).
+ */
+#define PULL_BE_U8(data, pos) \
+    (_DATA_BYTE_CONST(data, pos))
+#define PULL_BE_I8(data, pos) \
+    (int8_t)PULL_BE_U8(data, pos)
+
+#define PULL_BE_U16(data, pos) \
+    ((((uint16_t)(PULL_BE_U8(data, pos))) << 8) | (uint16_t)PULL_BE_U8(data, (pos) + 1))
+#define PULL_BE_I16(data, pos) \
+    (int16_t)PULL_BE_U16(data, pos)
+
+#define PULL_BE_U32(data, pos) \
+    ((((uint32_t)PULL_BE_U16(data, pos)) << 16) | (uint32_t)(PULL_BE_U16(data, (pos) + 2)))
+#define PULL_BE_I32(data, pos) \
+    (int32_t)PULL_BE_U32(data, pos)
+
+#define PULL_BE_U64(data, pos) \
+    ((((uint64_t)PULL_BE_U32(data, pos)) << 32) | (uint64_t)(PULL_BE_U32(data, (pos) + 4)))
+#define PULL_BE_I64(data, pos) \
+    (int64_t)PULL_BE_U64(data, pos)
+
+
+
+#define PUSH_BE_U8(data, pos, val) \
+    (_DATA_BYTE(data, pos) = ((uint8_t)(val)))
+#define PUSH_BE_I8(data, pos, val) \
+    PUSH_BE_U8(data, pos, val)
+
+#define PUSH_BE_U16(data, pos, val) \
+    (PUSH_BE_U8((data), (pos), (uint8_t)(((uint16_t)(val)) >> 8)), PUSH_BE_U8((data), (pos) + 1, (uint8_t)((val) & 0xff)))
+#define PUSH_BE_I16(data, pos, val) \
+    PUSH_BE_U16(data, pos, val)
+
+#define PUSH_BE_U32(data, pos, val) \
+    (PUSH_BE_U16((data), (pos), (uint16_t)(((uint32_t)(val)) >> 16)), PUSH_BE_U16((data), (pos) + 2, (uint16_t)((val) & 0xffff)))
+#define PUSH_BE_I32(data, pos, val) \
+    PUSH_BE_U32(data, pos, val)
+
+#define PUSH_BE_U64(data, pos, val) \
+    (PUSH_BE_U32((data), (pos), (uint32_t)(((uint64_t)(val)) >> 32)), PUSH_BE_U32((data), (pos) + 4, (uint32_t)((val) & 0xffffffff)))
+#define PUSH_BE_I64(data, pos, val) \
+    PUSH_BE_U64(data, pos, val)
+
+#endif /* _BYTEARRAY_H */