6b2bb3d96d
Adds a zip mode ("-z") to imgdiff to construct efficient patches for
zip files (including jars and apks). We identify the regions within
the zip file containing deflated data, and when a corresponding file
can be found in the source zip, a patch is generated for the
uncompressed version of the data.
The GZIP chunk type is replaced with a DEFLATE chunk type that handles
a raw deflated data stream. This new DEFLATE chunk can be used for
both gzipped pieces (as found within boot and recovery images) and zip
files (apks, etc.) The gzip header and footer are handled by NORMAL
chunks on either side of the main DEFLATE chunks. (Typically these
tiny NORMAL chunks will get merged with adjacent chunks, so the number
of output chunks is unaffected.)
Add a test script that tests the generate-apply cycle on all the zips
and images within a pair of full OTA packages.
31 lines
1.1 KiB
C
31 lines
1.1 KiB
C
/*
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* Copyright (C) 2009 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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// Image patch chunk types
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#define CHUNK_NORMAL 0
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#define CHUNK_GZIP 1 // version 1 only
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#define CHUNK_DEFLATE 2 // version 2 only
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#define CHUNK_RAW 3 // version 2 only
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// The gzip header size is actually variable, but we currently don't
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// support gzipped data with any of the optional fields, so for now it
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// will always be ten bytes. See RFC 1952 for the definition of the
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// gzip format.
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#define GZIP_HEADER_LEN 10
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// The gzip footer size really is fixed.
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#define GZIP_FOOTER_LEN 8
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