15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2010 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Implementation of the byte-level differential compression used internally by 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Courgette. 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "courgette/simple_delta.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/basictypes.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "courgette/third_party/bsdiff.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace courgette { 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace { 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)Status BSDiffStatusToStatus(BSDiffStatus status) { 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) switch (status) { 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case OK: return C_OK; 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case CRC_ERROR: return C_BINARY_DIFF_CRC_ERROR; 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) default: return C_GENERAL_ERROR; 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)Status ApplySimpleDelta(SourceStream* old, SourceStream* delta, 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SinkStream* target) { 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return BSDiffStatusToStatus(ApplyBinaryPatch(old, delta, target)); 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)Status GenerateSimpleDelta(SourceStream* old, SourceStream* target, 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SinkStream* delta) { 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VLOG(1) << "GenerateSimpleDelta " << old->Remaining() 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) << " " << target->Remaining(); 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return BSDiffStatusToStatus(CreateBinaryPatch(old, target, delta)); 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace courgette 42