You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
72 lines
2.3 KiB
72 lines
2.3 KiB
/*
|
|
* Copyright (C) 2015 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <stdint.h>
|
|
|
|
#include <async_safe/log.h>
|
|
|
|
#include "linker_debug.h"
|
|
|
|
// Helper classes for decoding LEB128, used in packed relocation data.
|
|
// http://en.wikipedia.org/wiki/LEB128
|
|
|
|
class sleb128_decoder {
|
|
public:
|
|
sleb128_decoder(const uint8_t* buffer, size_t count)
|
|
: current_(buffer), end_(buffer+count) { }
|
|
|
|
size_t pop_front() {
|
|
size_t value = 0;
|
|
static const size_t size = CHAR_BIT * sizeof(value);
|
|
|
|
size_t shift = 0;
|
|
uint8_t byte;
|
|
|
|
do {
|
|
if (current_ >= end_) {
|
|
async_safe_fatal("sleb128_decoder ran out of bounds");
|
|
}
|
|
byte = *current_++;
|
|
value |= (static_cast<size_t>(byte & 127) << shift);
|
|
shift += 7;
|
|
} while (byte & 128);
|
|
|
|
if (shift < size && (byte & 64)) {
|
|
value |= -(static_cast<size_t>(1) << shift);
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
private:
|
|
const uint8_t* current_;
|
|
const uint8_t* const end_;
|
|
};
|