create NResUI

2025-06-20 08:18:36 +03:00 · 2024-11-15 19:06:44 +03:00
parent 0c39485188
commit 1091605e2d
22 changed files with 869 additions and 100 deletions
--- a/NResLib/NResParser.cs
+++ b/NResLib/NResParser.cs
@ -0,0 +1,78 @@
+using System.Buffers.Binary;
+using System.Text;
+
+namespace NResLib;
+
+public static class NResParser
+{
+    public static NResParseResult ReadFile(string path)
+    {
+        using FileStream nResFs = new FileStream(path, FileMode.Open);
+
+        if (nResFs.Length < 16)
+        {
+            return new NResParseResult(null, "Файл не может быть NRes, менее 16 байт");
+        }
+        
+        Span<byte> buffer = stackalloc byte[16];
+
+        nResFs.ReadExactly(buffer);
+
+        if (buffer[0] != 'N' || buffer[1] != 'R' || buffer[2] != 'e' || buffer[3] != 's')
+        {
+            return new NResParseResult(null, "Файл не начинается с NRes");
+        }
+
+        var header = new NResArchiveHeader(
+            NRes: Encoding.ASCII.GetString(buffer[0..4]),
+            Version: BinaryPrimitives.ReadInt32LittleEndian(buffer[4..8]),
+            FileCount: BinaryPrimitives.ReadInt32LittleEndian(buffer[8..12]),
+            TotalFileLengthBytes: BinaryPrimitives.ReadInt32LittleEndian(buffer[12..16])
+        );
+
+        if (header.TotalFileLengthBytes != nResFs.Length)
+        {
+            return new NResParseResult(
+                null,
+                $"Длина файла не совпадает с заявленным в заголовке.\n" +
+                $"Заявлено: {header.TotalFileLengthBytes}\n" +
+                $"Фактически: {nResFs.Length}"
+            );
+        }
+
+        nResFs.Seek(-header.FileCount * 64, SeekOrigin.End);
+
+        var elements = new List<ListMetadataItem>(header.FileCount);
+
+        Span<byte> metaDataBuffer = stackalloc byte[64];
+        for (int i = 0; i < header.FileCount; i++)
+        {
+            nResFs.ReadExactly(metaDataBuffer);
+
+            elements.Add(
+                new ListMetadataItem(
+                    FileType: Encoding.ASCII.GetString(metaDataBuffer[..8]),
+                    Magic1: BinaryPrimitives.ReadInt32LittleEndian(metaDataBuffer[8..12]),
+                    FileLength: BinaryPrimitives.ReadInt32LittleEndian(metaDataBuffer[12..16]),
+                    Magic2: BinaryPrimitives.ReadInt32LittleEndian(metaDataBuffer[16..20]),
+                    FileName: Encoding.ASCII.GetString(metaDataBuffer[20..40]),
+                    Magic3: BinaryPrimitives.ReadInt32LittleEndian(metaDataBuffer[40..44]),
+                    Magic4: BinaryPrimitives.ReadInt32LittleEndian(metaDataBuffer[44..48]),
+                    Magic5: BinaryPrimitives.ReadInt32LittleEndian(metaDataBuffer[48..52]),
+                    Magic6: BinaryPrimitives.ReadInt32LittleEndian(metaDataBuffer[52..56]),
+                    OffsetInFile: BinaryPrimitives.ReadInt32LittleEndian(metaDataBuffer[56..60]),
+                    Index: BinaryPrimitives.ReadInt32LittleEndian(metaDataBuffer[60..64])
+                )
+            );
+
+            metaDataBuffer.Clear();
+        }
+
+        return new NResParseResult(
+            new NResArchive(
+                Header: header,
+                Files: elements
+            )
+        );
+    }
+}