From 2066e4911948d11cac5a234d2f7773dc5f06ba96 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Mon, 18 Mar 2024 23:41:20 +0100
Subject: Added filesystem-only starshatter::data DataLoader replacement

Step by step. The intent is to find a good spot between current data
representations and the standard library and put the intermediate
stage there. After it matures a bit, we can move further away.
---
 FoundationEx/src/reader/file.cpp | 129 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 FoundationEx/src/reader/file.cpp

(limited to 'FoundationEx/src/reader/file.cpp')

diff --git a/FoundationEx/src/reader/file.cpp b/FoundationEx/src/reader/file.cpp
new file mode 100644
index 0000000..f9e9ae2
--- /dev/null
+++ b/FoundationEx/src/reader/file.cpp
@@ -0,0 +1,129 @@
+/*  Starshatter: The Open Source Project
+    Copyright (c) 2021-2024, Starshatter: The Open Source Project Contributors
+    Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
+    Copyright (c) 1997-2006, Destroyer Studios LLC.
+*/
+
+#include "file.h"
+
+#include <algorithm>
+#include <fstream>
+#include <ios>
+#include <limits>
+#include <utility>
+#include <vector>
+
+#include <Text.h>
+
+
+namespace starshatter
+{
+namespace foundation
+{
+
+
+FileReader::FileReader(std::fstream src) :
+	file {std::move(src)}
+{
+	file.seekg(0);
+	file.ignore(std::numeric_limits<std::streamsize>::max());
+	size = file.gcount();
+	file.clear();
+	file.seekg(0);
+	position = 0;
+}
+
+
+bool
+FileReader::valid() const
+{
+	return static_cast<bool>(file) && file.is_open();
+}
+
+
+Count
+FileReader::available() const
+{
+	return size - position;
+}
+
+
+Count
+FileReader::seek(Count pos)
+{
+	position = pos;
+	if (position > size)
+		position = size;
+	file.seekg(position);
+	return position;
+}
+
+
+Count
+FileReader::seek(Offset offset, Direction dir)
+{
+	switch (dir) {
+	case Direction::Start:
+		break;  // no-op
+	case Direction::End:
+		offset = size + offset;
+		break;
+	case Direction::Current:
+		offset = position + offset;
+		break;
+	}
+	if (offset < 0)
+		offset = 0;
+	return seek(static_cast<Count>(offset));
+}
+
+
+Count
+FileReader::read(char* dest)
+{
+	return read(dest, available());
+}
+
+
+Count
+FileReader::read(char* dest, Count bytes)
+{
+	bytes = std::min(bytes, available());
+	file.read(dest, bytes);
+	position += bytes;
+	return bytes;
+}
+
+
+Count
+FileReader::peek(char* dest) const
+{
+	return peek(dest, available());
+}
+
+
+Count
+FileReader::peek(char* dest, Count bytes) const
+{
+	bytes = std::min(bytes, available());
+	const auto before = file.tellg();
+	file.read(dest, bytes);
+	file.seekg(before);
+	return bytes;
+}
+
+
+Text
+FileReader::more()
+{
+	const auto size = available();
+	if (size < 1)
+		return Text();
+	std::vector<char> tmp(size);
+	read(tmp.data(), size);
+	return Text(tmp.data(), size);
+}
+
+
+}  // namespace foundation
+}  // namespace starshatter
-- 
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