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27 lines
718 B
C++
27 lines
718 B
C++
// Copyright 2018 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "bsdiff/utils.h"
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namespace bsdiff {
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int64_t ParseInt64(const uint8_t* buf) {
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// BSPatch uses a non-standard encoding of integers.
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// Highest bit of that integer is used as a sign bit, 1 = negative
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// and 0 = positive.
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// Therefore, if the highest bit is set, flip it, then do 2's complement
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// to get the integer in standard form
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int64_t result = buf[7] & 0x7F;
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for (int i = 6; i >= 0; i--) {
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result <<= 8;
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result |= buf[i];
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}
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if (buf[7] & 0x80)
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result = -result;
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return result;
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}
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} // namespace bsdiff
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