Cleanup.

sqlite3/lib/src/wasm/vfs/growing_buffer.dart → sqlite3/lib/src/wasm/vfs/dynamic_buffer.dart

@@ -2,16 +2,20 @@ import 'dart:typed_data';
 
 /// A utility class that manages a growing byte buffer.
 /// It dynamically increases its capacity in factors of 2 when needed.
-class GrowingByteBuffer {
+class DynamicBuffer {
   Uint8List _buffer;
   int _capacity;
   int _length = 0;
 
-  /// Creates a [GrowingByteBuffer] with an optional initial capacity.
+  /// Creates a [DynamicBuffer] with an optional initial capacity.
   /// The default initial capacity is 1024 bytes.
-  GrowingByteBuffer([int initialCapacity = 1024])
+  DynamicBuffer([int initialCapacity = 1024])
       : _capacity = initialCapacity,
-        _buffer = Uint8List(initialCapacity);
+        _buffer = Uint8List(initialCapacity) {
+    if (initialCapacity < 1) {
+      throw ArgumentError("initialCapacity must be positive");
+    }
+  }
 
   /// Adds [data] to the buffer, expanding its capacity if necessary.
   void add(Uint8List data) {
@@ -26,7 +30,7 @@ class GrowingByteBuffer {
     if (offset < 0) {
       throw ArgumentError("Offset must be non-negative");
     }
-    int endPosition = offset + data.length;
+    final endPosition = offset + data.length;
     _ensureCapacity(endPosition);
     _buffer.setRange(offset, endPosition, data);
     if (endPosition > _length) {
@@ -35,6 +39,9 @@ class GrowingByteBuffer {
   }
 
   /// Truncates the buffer to a specific [newSize].
+  ///
+  /// No memory is freed when using [truncate].
+  ///
   /// If [newSize] is less than the current length, the buffer is truncated.
   /// If [newSize] is greater than the current length, the buffer length is extended with zeros.
   void truncate(int newSize) {
@@ -49,7 +56,7 @@ class GrowingByteBuffer {
     _length = newSize;
   }
 
-  /// Returns a [Uint8List] containing the data up to the current length.
+  /// Returns a [Uint8List] view containing the data up to the current length.
   Uint8List toUint8List() {
     return Uint8List.view(_buffer.buffer, 0, _length);
   }
@@ -63,7 +70,6 @@ class GrowingByteBuffer {
         newCapacity *= 2;
       }
       // Allocate a new buffer and copy existing data.
-      print('resizing to $newCapacity');
       Uint8List newBuffer = Uint8List(newCapacity);
       newBuffer.setRange(0, _length, _buffer);
       _buffer = newBuffer;

sqlite3/lib/src/wasm/vfs/indexed_db.dart

@@ -8,7 +8,7 @@ import 'dart:math';
 import 'dart:typed_data';
 
 import 'package:meta/meta.dart';
-import 'package:sqlite3/src/wasm/vfs/growing_buffer.dart';
+import 'package:sqlite3/src/wasm/vfs/dynamic_buffer.dart';
 import 'package:web/web.dart' as web;
 
 import '../../constants.dart';
@@ -534,7 +534,7 @@ final class IndexedDbFileSystem extends BaseVirtualFileSystem {
       final name = entry.key;
       final fileId = entry.value;
 
-      final buffer = GrowingByteBuffer();
+      final buffer = DynamicBuffer();
       final data = await _asynchronous.readFully(fileId);
       buffer.add(data);
 
@@ -647,7 +647,7 @@ class _IndexedDbFile implements VirtualFileSystemFile {
   void xWrite(Uint8List buffer, int fileOffset) {
     vfs._checkClosed();
 
-    final previousContent = vfs._memory.fileData[path] ?? GrowingByteBuffer();
+    final previousContent = vfs._memory.fileData[path] ?? DynamicBuffer();
     memoryFile.xWrite(buffer, fileOffset);
 
     if (!vfs._inMemoryOnlyFiles.contains(path)) {

sqlite3/lib/src/wasm/vfs/memory.dart

@@ -2,14 +2,14 @@ import 'dart:math';
 import 'dart:typed_data';
 
 import 'package:path/path.dart' as p;
-import 'growing_buffer.dart';
+import 'dynamic_buffer.dart';
 
 import '../../constants.dart';
 import '../../vfs.dart';
 import 'utils.dart';
 
 final class InMemoryFileSystem extends BaseVirtualFileSystem {
-  final Map<String, GrowingByteBuffer?> fileData = {};
+  final Map<String, DynamicBuffer?> fileData = {};
 
   InMemoryFileSystem({super.name = 'dart-memory', super.random});
 
@@ -35,7 +35,7 @@ final class InMemoryFileSystem extends BaseVirtualFileSystem {
       final create = flags & SqlFlag.SQLITE_OPEN_CREATE;
 
       if (create != 0) {
-        fileData[pathStr] = GrowingByteBuffer();
+        fileData[pathStr] = DynamicBuffer();
       } else {
         throw VfsException(SqlError.SQLITE_CANTOPEN);
       }
@@ -104,8 +104,8 @@ class _InMemoryFile extends BaseVfsFile {
     final file = vfs.fileData[path];
 
     if (file == null) {
-      vfs.fileData[path] = GrowingByteBuffer();
-      // TODO: grow?
+      vfs.fileData[path] = DynamicBuffer();
+      vfs.fileData[path]!.truncate(size);
     } else {
       file.truncate(size);
     }
@@ -121,7 +121,7 @@ class _InMemoryFile extends BaseVfsFile {
     var file = vfs.fileData[path];
 
     if (file == null) {
-      file = GrowingByteBuffer();
+      file = DynamicBuffer();
       vfs.fileData[path] = file;
     }
     file.write(buffer, fileOffset);