[standalone] Automatically decompress gzip'd resources, including sources and script snapshots.

runtime/bin/dartutils.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_BIN_DARTUTILS_H_
 #define RUNTIME_BIN_DARTUTILS_H_
 
 #include "bin/isolate_data.h"
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
@@ skipping 182 matching lines @@
   static Dart_Handle GetCanonicalizableWorkingDirectory();
 
   static const char* MapLibraryUrl(const char* url_string);
 
   static Dart_Handle ResolveUriInWorkingDirectory(Dart_Handle script_uri);
   static Dart_Handle ResolveScript(Dart_Handle url);
 
   enum MagicNumber {
     kSnapshotMagicNumber,
     kKernelMagicNumber,
+    kGzipMagicNumber,
     kUnknownMagicNumber
   };
 
-  // static const uint8_t* GetMagicNumber(MagicNumber number);
-
-  // Sniffs the specified text_buffer to see if it contains the magic number
-  // representing a script snapshot. If the text_buffer is a script snapshot
-  // the return value is an updated pointer to the text_buffer pointing past
-  // the magic number value. The 'buffer_len' parameter is also appropriately
-  // adjusted.
-  static MagicNumber SniffForMagicNumber(const uint8_t** text_buffer,
-                                         intptr_t* buffer_len);
+  // Checks if the buffer is a script snapshot, kernel file, or gzip file.
+  static MagicNumber SniffForMagicNumber(const uint8_t* text_buffer,
+                                         intptr_t buffer_len);
 
   // Write a magic number to indicate a script snapshot file.
-  static void WriteMagicNumber(File* file);
+  static void WriteSnapshotMagicNumber(File* file);
+  static void SkipSnapshotMagicNumber(const uint8_t** buffer, intptr_t* length);
 
   // Global state that stores the original working directory..
   static const char* original_working_directory;
 
   // Global state that captures the URL mappings specified on the command line.
   static CommandLineOptions* url_mapping;
 
   static const char* const kDartScheme;
   static const char* const kDartExtensionScheme;
   static const char* const kAsyncLibURL;
@@ skipping 413 matching lines @@
   bool is_typed_data_;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(ScopedMemBuffer);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // RUNTIME_BIN_DARTUTILS_H_