1 files changed, 95 insertions, 0 deletions
diff --git a/courgette/win32_x86_patcher.h b/courgette/win32_x86_patcher.h
new file mode 100644
index 0000000..9ab53d9
--- /dev/null
+++ b/courgette/win32_x86_patcher.h
@@ -0,0 +1,95 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This is the transformation for Windows X86 executables.
+
+#ifndef COURGETTE_WIN32_X86_PATCHER_H_
+#define COURGETTE_WIN32_X86_PATCHER_H_
+
+#include "courgette/ensemble.h"
+
+namespace courgette {
+
+// CourgetteWin32X86Patcher is a TransformationPatcher for Windows 32-bit
+// executables.
+//
+class CourgetteWin32X86Patcher : public TransformationPatcher {
+ public:
+  explicit CourgetteWin32X86Patcher(const Region& region)
+      : ensemble_region_(region) {
+  }
+
+  Status Init(SourceStream* parameter_stream) {
+    if (!parameter_stream->ReadVarint32(&base_offset_))
+      return C_BAD_TRANSFORM;
+    if (!parameter_stream->ReadVarint32(&base_length_))
+      return C_BAD_TRANSFORM;
+
+    if (base_offset_ > ensemble_region_.length())
+      return C_BAD_TRANSFORM;
+    if (base_length_ > ensemble_region_.length() - base_offset_)
+      return C_BAD_TRANSFORM;
+
+    return C_OK;
+  }
+
+  Status PredictTransformParameters(SinkStreamSet* predicted_parameters) {
+    // No code needed to write an 'empty' predicted parameter set.
+    return C_OK;
+  }
+
+  Status Transform(SourceStreamSet* corrected_parameters,
+                   SinkStreamSet* transformed_element) {
+    Status status;
+    if (!corrected_parameters->Empty())
+      return C_GENERAL_ERROR;   // Don't expect any corrected parameters.
+
+    AssemblyProgram* program = NULL;
+    status = ParseWin32X86PE(ensemble_region_.start() + base_offset_,
+                             base_length_,
+                             &program);
+    if (status != C_OK)
+      return status;
+
+    EncodedProgram* encoded = NULL;
+    status = Encode(program, &encoded);
+    DeleteAssemblyProgram(program);
+    if (status != C_OK)
+      return status;
+
+    status = WriteEncodedProgram(encoded, transformed_element);
+    DeleteEncodedProgram(encoded);
+    if (status != C_OK)
+      return status;
+
+    return status;
+  }
+
+  Status Reform(SourceStreamSet* transformed_element,
+                SinkStream* reformed_element) {
+    Status status;
+    EncodedProgram* encoded_program = NULL;
+    status = ReadEncodedProgram(transformed_element, &encoded_program);
+    if (status != C_OK)
+      return status;
+
+    status = Assemble(encoded_program, reformed_element);
+    DeleteEncodedProgram(encoded_program);
+    if (status != C_OK)
+      return status;
+
+    return C_OK;
+  }
+
+ private:
+  Region ensemble_region_;
+
+  uint32 base_offset_;
+  uint32 base_length_;
+
+  DISALLOW_COPY_AND_ASSIGN(CourgetteWin32X86Patcher);
+};
+
+}  // namespace
+#endif  // COURGETTE_WIN32_X86_PATCHER_H_