02d444b07e
Images (like boot and recovery) consist of large sections of gzipped data interspersed with other data. To do effective binary patching of these files, we need to apply patches to the gzipped parts in 'uncompressed space', that is, we decompress, apply a patch, then recompress to obtain the desired output. This change defines a new format with these patches, which is basically a description of how the source and target files are to be divided up into chunks and a bsdiff patch for each chunk. We add a new host executable, "imgdiff", for generating these patches from source and target images, and add support in applypatch for recognizing this format and applying it on the device.
62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _APPLYPATCH_H
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#define _APPLYPATCH_H
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#include "mincrypt/sha.h"
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typedef struct _Patch {
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uint8_t sha1[SHA_DIGEST_SIZE];
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const char* patch_filename;
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} Patch;
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typedef struct _FileContents {
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uint8_t sha1[SHA_DIGEST_SIZE];
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unsigned char* data;
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size_t size;
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struct stat st;
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} FileContents;
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// When there isn't enough room on the target filesystem to hold the
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// patched version of the file, we copy the original here and delete
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// it to free up space. If the expected source file doesn't exist, or
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// is corrupted, we look to see if this file contains the bits we want
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// and use it as the source instead.
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#define CACHE_TEMP_SOURCE "/cache/saved.file"
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// applypatch.c
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size_t FreeSpaceForFile(const char* filename);
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// bsdiff.c
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void ShowBSDiffLicense();
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int ApplyBSDiffPatch(const unsigned char* old_data, ssize_t old_size,
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const char* patch_filename, ssize_t offset,
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FILE* output, SHA_CTX* ctx);
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int ApplyBSDiffPatchMem(const unsigned char* old_data, ssize_t old_size,
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const char* patch_filename, ssize_t patch_offset,
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unsigned char** new_data, ssize_t* new_size);
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// imgpatch.c
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int ApplyImagePatch(const unsigned char* old_data, ssize_t old_size,
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const char* patch_filename,
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FILE* output, SHA_CTX* ctx);
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// freecache.c
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int MakeFreeSpaceOnCache(size_t bytes_needed);
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#endif
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