delta_diff_utils.h revision f0061358b5f741baeeb9177b838b289d2ce318f3
1// Copyright 2015 The Chromium OS Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_DELTA_DIFF_UTILS_H_ 6#define UPDATE_ENGINE_PAYLOAD_GENERATOR_DELTA_DIFF_UTILS_H_ 7 8#include <string> 9#include <vector> 10 11#include <chromeos/secure_blob.h> 12 13#include "update_engine/payload_generator/annotated_operation.h" 14#include "update_engine/payload_generator/extent_ranges.h" 15#include "update_engine/payload_generator/payload_generation_config.h" 16#include "update_engine/update_metadata.pb.h" 17 18namespace chromeos_update_engine { 19 20namespace diff_utils { 21 22// Create operations in |aops| to produce all the blocks in the |new_part| 23// partition using the filesystem opened in that PartitionConfig. 24// It uses the files reported by the filesystem in |old_part| and the data 25// blocks in that partition (if available) to determine the best way to compress 26// the new files (REPLACE, REPLACE_BZ, COPY, BSDIFF) and writes any necessary 27// data to the end of |data_fd| updating |data_file_size| accordingly. 28bool DeltaReadPartition(std::vector<AnnotatedOperation>* aops, 29 const PartitionConfig& old_part, 30 const PartitionConfig& new_part, 31 off_t chunk_blocks, 32 int data_fd, 33 off_t* data_file_size, 34 bool skip_block_0, 35 bool src_ops_allowed); 36 37// Create operations in |aops| for identical blocks that moved around in the old 38// and new partition and also handle zeroed blocks. The old and new partition 39// are stored in the |old_part| and |new_part| files and have |old_num_blocks| 40// and |new_num_blocks| respectively. The maximum operation size is 41// |chunk_blocks| blocks, or unlimited if |chunk_blocks| is -1. The blobs of the 42// produced operations are stored in the |data_fd| file whose size is updated 43// in the value pointed by |data_file_size|. 44// The collections |old_visited_blocks| and |new_visited_blocks| state what 45// blocks already have operations reading or writing them and only operations 46// for unvisited blocks are produced by this function updating both collections 47// with the used blocks. 48bool DeltaMovedAndZeroBlocks(std::vector<AnnotatedOperation>* aops, 49 const std::string& old_part, 50 const std::string& new_part, 51 size_t old_num_blocks, 52 size_t new_num_blocks, 53 off_t chunk_blocks, 54 bool src_ops_allowed, 55 int data_fd, 56 off_t* data_file_size, 57 ExtentRanges* old_visited_blocks, 58 ExtentRanges* new_visited_blocks); 59 60// For a given file |name| append operations to |aops| to produce it in the 61// |new_part|. The file will be split in chunks of |chunk_blocks| blocks each 62// or treated as a single chunk if |chunk_blocks| is -1. The file data is 63// stored in |new_part| in the blocks described by |new_extents| and, if it 64// exists, the old version exists in |old_part| in the blocks described by 65// |old_extents|. The operations added to |aops| reference the data blob 66// in the file |data_fd|, which has length *data_file_size. *data_file_size is 67// updated appropriately. Returns true on success. 68bool DeltaReadFile(std::vector<AnnotatedOperation>* aops, 69 const std::string& old_part, 70 const std::string& new_part, 71 const std::vector<Extent>& old_extents, 72 const std::vector<Extent>& new_extents, 73 const std::string& name, 74 off_t chunk_blocks, 75 int data_fd, 76 off_t* data_file_size, 77 bool src_ops_allowed); 78 79// Reads the blocks |old_extents| from |old_part| (if it exists) and the 80// |new_extents| from |new_part| and determines the smallest way to encode 81// this |new_extents| for the diff. It stores necessary data in |out_data| and 82// fills in |out_op|. If there's no change in old and new files, it creates a 83// MOVE operation. If there is a change, the smallest of REPLACE, REPLACE_BZ, 84// or BSDIFF wins. |new_extents| must not be empty. 85// If |src_ops_allowed| is true, it will emit SOURCE_COPY and SOURCE_BSDIFF 86// operations instead of MOVE and BSDIFF, respectively. 87// Returns true on success. 88bool ReadExtentsToDiff(const std::string& old_part, 89 const std::string& new_part, 90 const std::vector<Extent>& old_extents, 91 const std::vector<Extent>& new_extents, 92 bool bsdiff_allowed, 93 chromeos::Blob* out_data, 94 DeltaArchiveManifest_InstallOperation* out_op, 95 bool src_ops_allowed); 96 97// Runs the bsdiff tool on two files and returns the resulting delta in 98// |out|. Returns true on success. 99bool BsdiffFiles(const std::string& old_file, 100 const std::string& new_file, 101 chromeos::Blob* out); 102 103// Returns true if |op| is a no-op operation that doesn't do any useful work 104// (e.g., a move operation that copies blocks onto themselves). 105bool IsNoopOperation(const DeltaArchiveManifest_InstallOperation& op); 106 107// Filters all the operations that are no-op, maintaining the relative order 108// of the rest of the operations. 109void FilterNoopOperations(std::vector<AnnotatedOperation>* ops); 110 111bool InitializePartitionInfo(const PartitionConfig& partition, 112 PartitionInfo* info); 113 114} // namespace diff_utils 115 116} // namespace chromeos_update_engine 117 118#endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_DELTA_DIFF_UTILS_H_ 119