61 lines
2.3 KiB
C
61 lines
2.3 KiB
C
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/*
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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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#include <stdio.h>
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extern int applypatch(int argc, char** argv);
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// This program applies binary patches to files in a way that is safe
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// (the original file is not touched until we have the desired
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// replacement for it) and idempotent (it's okay to run this program
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// multiple times).
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//
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// - if the sha1 hash of <tgt-file> is <tgt-sha1>, does nothing and exits
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// successfully.
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//
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// - otherwise, if the sha1 hash of <src-file> is <src-sha1>, applies the
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// bsdiff <patch> to <src-file> to produce a new file (the type of patch
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// is automatically detected from the file header). If that new
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// file has sha1 hash <tgt-sha1>, moves it to replace <tgt-file>, and
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// exits successfully. Note that if <src-file> and <tgt-file> are
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// not the same, <src-file> is NOT deleted on success. <tgt-file>
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// may be the string "-" to mean "the same as src-file".
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//
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// - otherwise, or if any error is encountered, exits with non-zero
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// status.
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//
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// <src-file> (or <file> in check mode) may refer to an MTD partition
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// to read the source data. See the comments for the
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// LoadMTDContents() function above for the format of such a filename.
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int main(int argc, char** argv) {
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int result = applypatch(argc, argv);
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if (result == 2) {
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fprintf(stderr,
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"usage: %s <src-file> <tgt-file> <tgt-sha1> <tgt-size> "
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"[<src-sha1>:<patch> ...]\n"
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" or %s -c <file> [<sha1> ...]\n"
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" or %s -s <bytes>\n"
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" or %s -l\n"
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"\n"
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"Filenames may be of the form\n"
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" MTD:<partition>:<len_1>:<sha1_1>:<len_2>:<sha1_2>:...\n"
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"to specify reading from or writing to an MTD partition.\n\n",
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argv[0], argv[0], argv[0], argv[0]);
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}
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return result;
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}
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