From 71cf2a8dd3c0086d69954e9ed917db95faf7e3d5 Mon Sep 17 00:00:00 2001
From: Timothy Schenk <admin@rainote.dev>
Date: Thu, 16 Nov 2023 17:56:13 +0100
Subject: [PATCH] chore: add useful scripts

---
 scripts/dexor_binary_file.ps1 | 14 ++++++++++++++
 scripts/split_dat_file.ps1    | 36 +++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 scripts/dexor_binary_file.ps1
 create mode 100644 scripts/split_dat_file.ps1

diff --git a/scripts/dexor_binary_file.ps1 b/scripts/dexor_binary_file.ps1
new file mode 100644
index 0000000..5df9244
--- /dev/null
+++ b/scripts/dexor_binary_file.ps1
@@ -0,0 +1,14 @@
+$SourceFilePath = $args[0]
+$DestinationFilePath = $args[1]
+$XorKey = [byte]$args[2]
+
+# Load the binary data from the file
+$data = [System.IO.File]::ReadAllBytes($SourceFilePath)
+
+# Apply the XOR operation
+for ($i = 0; $i -lt $data.Length; $i++) {
+    $data[$i] = $data[$i] -bxor $XorKey
+}
+
+# Write the output to the destination file
+[System.IO.File]::WriteAllBytes($DestinationFilePath, $data)
diff --git a/scripts/split_dat_file.ps1 b/scripts/split_dat_file.ps1
new file mode 100644
index 0000000..39be178
--- /dev/null
+++ b/scripts/split_dat_file.ps1
@@ -0,0 +1,36 @@
+$SourceFilePath = $args[0]
+$ChunkSize = $args[1]
+$Offset = $args[2]
+
+# Function to create chunk file
+function Create-ChunkFile {
+    param (
+        [byte[]]$ChunkData,
+        [int]$ChunkNumber
+    )
+
+    $chunkFileName = Join-Path $subDir ("{0}_{1:D5}.bin" -f [System.IO.Path]::GetFileNameWithoutExtension($SourceFilePath), $ChunkNumber)
+    [System.IO.File]::WriteAllBytes($chunkFileName, $ChunkData)
+}
+
+# Create subdirectory named after the source file (without extension) for chunks
+$subDir = Join-Path ([System.IO.Path]::GetDirectoryName($SourceFilePath)) ([System.IO.Path]::GetFileNameWithoutExtension($SourceFilePath))
+if (!(Test-Path -Path $subDir)) {
+    New-Item -ItemType Directory -Path $subDir
+}
+
+# Read the binary data from the file
+$data = [System.IO.File]::ReadAllBytes($SourceFilePath)
+$dataLength = $data.Length
+$chunkNumber = 0
+
+# Adjust the start position based on the offset
+$startPosition = [Math]::Min($Offset, $dataLength)
+
+# Process chunks
+for ($i = $startPosition; $i -lt $dataLength; $i += $ChunkSize) {
+    $chunkEnd = [Math]::Min($i + $ChunkSize, $dataLength)
+    $chunkData = $data[$i..($chunkEnd - 1)]
+    Create-ChunkFile -ChunkData $chunkData -ChunkNumber $chunkNumber
+    $chunkNumber++
+}