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74 lines
2.3 KiB
74 lines
2.3 KiB
/* |
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* Copyright (C) 2015 The Android Open Source Project |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#ifndef _LINKER_SLEB128_H |
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#define _LINKER_SLEB128_H |
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#include <stdint.h> |
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#include <async_safe/log.h> |
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#include "linker_debug.h" |
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// Helper classes for decoding LEB128, used in packed relocation data. |
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// http://en.wikipedia.org/wiki/LEB128 |
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class sleb128_decoder { |
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public: |
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sleb128_decoder(const uint8_t* buffer, size_t count) |
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: current_(buffer), end_(buffer+count) { } |
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size_t pop_front() { |
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size_t value = 0; |
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static const size_t size = CHAR_BIT * sizeof(value); |
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size_t shift = 0; |
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uint8_t byte; |
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do { |
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if (current_ >= end_) { |
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async_safe_fatal("sleb128_decoder ran out of bounds"); |
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} |
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byte = *current_++; |
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value |= (static_cast<size_t>(byte & 127) << shift); |
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shift += 7; |
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} while (byte & 128); |
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if (shift < size && (byte & 64)) { |
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value |= -(static_cast<size_t>(1) << shift); |
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} |
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return value; |
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} |
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private: |
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const uint8_t* current_; |
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const uint8_t* const end_; |
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}; |
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#endif // __LINKER_SLEB128_H
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