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diff --git a/courgette/courgette.h b/courgette/courgette.h
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+// 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.
+
+#ifndef COURGETTE_COURGETTE_H_
+#define COURGETTE_COURGETTE_H_
+
+namespace courgette {
+
+// Status codes for Courgette APIs.
+//
+// Client code should only rely on the distintion between C_OK and the other
+// status codes.
+//
+enum Status {
+  C_OK = 1,                       // Successful operation.
+
+  C_GENERAL_ERROR = 2,            // Error other than listed below.
+
+  C_READ_OPEN_ERROR = 3,          // Could not open input file for reading.
+  C_READ_ERROR = 4,               // Could not read from opened input file.
+
+  C_WRITE_OPEN_ERROR = 3,         // Could not open output file for writing.
+  C_WRITE_ERROR = 4,              // Could not write to opened output file.
+
+  C_BAD_ENSEMBLE_MAGIC = 5,       // Ensemble patch has bad magic.
+  C_BAD_ENSEMBLE_VERSION = 6,     // Ensemble patch has wrong version.
+  C_BAD_ENSEMBLE_HEADER = 7,      // Ensemble patch has corrupt header.
+  C_BAD_ENSEMBLE_CRC = 8,         // Ensemble patch has corrupt header.
+
+  C_BAD_TRANSFORM = 12,           // Transform mis-specified.
+  C_BAD_BASE = 13,                // Base for transform malformed.
+
+  C_BINARY_DIFF_CRC_ERROR = 14,   // Internal diff input doesn't have expected
+                                  // CRC.
+
+  // Internal errors.
+  C_STREAM_ERROR = 20,            // Unexpected error from streams.h.
+  C_STREAM_NOT_CONSUMED = 21,     // Stream has extra data, is expected to be
+                                  // used up.
+  C_SERIALIZATION_FAILED = 22,    //
+  C_DESERIALIZATION_FAILED = 23,  //
+  C_INPUT_NOT_RECOGNIZED = 24,    // Unrecognized input (not an executable).
+  C_DISASSEMBLY_FAILED = 25,      //
+  C_ASSEMBLY_FAILED = 26,         //
+  C_ADJUSTMENT_FAILED = 27,       //
+
+
+};
+
+class SinkStream;
+class SinkStreamSet;
+class SourceStream;
+class SourceStreamSet;
+
+class AssemblyProgram;
+class EncodedProgram;
+
+// Applies the patch to the bytes in |old| and writes the transformed ensemble
+// to |output|.
+// Returns C_OK unless something went wrong.
+Status ApplyEnsemblePatch(SourceStream* old, SourceStream* patch,
+                          SinkStream* output);
+
+// Applies the patch in |patch_file_name| to the bytes in |old_file_name| and
+// writes the transformed ensemble to |new_file_name|.
+// Returns C_OK unless something went wrong.
+// This function first validates that the patch file has a proper header, so the
+// function can be used to 'try' a patch.
+Status ApplyEnsemblePatch(const wchar_t* old_file_name,
+                          const wchar_t* patch_file_name,
+                          const wchar_t* new_file_name);
+
+// Generates a patch that will transform the bytes in |old| into the bytes in
+// |target|.
+// Returns C_OK unless something when wrong (unexpected).
+Status GenerateEnsemblePatch(SourceStream* old, SourceStream* target,
+                             SinkStream* patch);
+
+// Parses a Windows 32-bit 'Portable Executable' format file from memory,
+// storing the pointer to the AssemblyProgram in |*output|.
+// Returns C_OK if successful, otherwise returns an error status and sets
+// |*output| to NULL.
+Status ParseWin32X86PE(const void* buffer, size_t length,
+                       AssemblyProgram** output);
+
+// Converts |program| into encoded form, returning it as |*output|.
+// Returns C_OK if succeeded, otherwise returns an error status and
+// sets |*output| to NULL
+Status Encode(AssemblyProgram* program, EncodedProgram** output);
+
+
+// Serializes |encoded| into the stream set.
+// Returns C_OK if succeeded, otherwise returns an error status.
+Status WriteEncodedProgram(EncodedProgram* encoded, SinkStreamSet* sink);
+
+// Assembles |encoded|, emitting the bytes into |buffer|.
+// Returns C_OK if succeeded, otherwise returns an error status and leaves
+// |buffer| in an undefined state.
+Status Assemble(EncodedProgram* encoded, SinkStream* buffer);
+
+// Deserializes program from the stream set.
+// Returns C_OK if succeeded, otherwise returns an error status and
+// sets |*output| to NULL
+Status ReadEncodedProgram(SourceStreamSet* source, EncodedProgram** output);
+
+// Used to free an AssemblyProgram returned by other APIs.
+void DeleteAssemblyProgram(AssemblyProgram* program);
+
+// Used to free an EncodedProgram returned by other APIs.
+void DeleteEncodedProgram(EncodedProgram* encoded);
+
+// Adjusts |program| to look more like |model|.
+//
+Status Adjust(const AssemblyProgram& model, AssemblyProgram *program);
+
+}  // namespace courgette
+#endif  // COURGETTE_COURGETTE_H_