From fcdca58617caf6a8c034a91588d6abb399be6b57 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Tue, 18 May 2021 00:06:37 +0100
Subject: Initial commit, still lots to do!

---
 lib/rawDataReader.cpp | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 lib/rawDataReader.cpp

(limited to 'lib/rawDataReader.cpp')

diff --git a/lib/rawDataReader.cpp b/lib/rawDataReader.cpp
new file mode 100644
index 0000000..2dd87a9
--- /dev/null
+++ b/lib/rawDataReader.cpp
@@ -0,0 +1,47 @@
+#include "rawDataReader.h"
+#include "helpers.h"
+#include "streamSupport.h"
+#include <cstring>
+#include <iomanip>
+#include <iostream>
+
+namespace MyGrate {
+	RawDataReader::RawDataReader(const void * const d, std::size_t l) :
+		rawdata {static_cast<const std::byte *>(d)}, len {l}
+	{
+	}
+
+	RawDataReader::RawDataReader(const MARIADB_STRING & str) : RawDataReader {str.str, str.length} { }
+
+	void
+	RawDataReader::offsetSizeCheck(size_t l) const
+	{
+		if (offset + l > len) {
+			throw std::range_error("Read beyond end of data");
+		}
+	}
+
+	void
+	RawDataReader::discard(size_t d)
+	{
+		offset += d;
+	}
+
+	template<>
+	uint64_t
+	RawDataReader::readValue<PackedInteger>()
+	{
+		switch (const auto byte1 {readValue<uint8_t>()}) {
+			case 0 ... 250: // The value as-is
+				return byte1;
+			case 252: // 2 bytes
+				return readValue<uint16_t, 2>();
+			case 253: // 3 bytes
+				return readValue<uint32_t, 3>();
+			case 254: // 8 bytes
+				return readValue<uint64_t, 8>();
+			default:;
+		}
+		throw std::domain_error("Invalid first byte of packed integer");
+	}
+}
-- 
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