blob: 71d339a0da7291d1f90eb42864b0d665f0488594 [file] [log] [blame]
// Copyright 2017 The Crashpad Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef CRASHPAD_SNAPSHOT_ELF_ELF_DYNAMIC_ARRAY_READER_H_
#define CRASHPAD_SNAPSHOT_ELF_ELF_DYNAMIC_ARRAY_READER_H_
#include <stdint.h>
#include <map>
#include "base/logging.h"
#include "util/misc/address_types.h"
#include "util/misc/reinterpret_bytes.h"
#include "util/process/process_memory_range.h"
namespace crashpad {
//! \brief A reader for ELF dynamic arrays mapped into another process.
class ElfDynamicArrayReader {
public:
ElfDynamicArrayReader();
ElfDynamicArrayReader(const ElfDynamicArrayReader&) = delete;
ElfDynamicArrayReader& operator=(const ElfDynamicArrayReader&) = delete;
~ElfDynamicArrayReader();
//! \brief Initializes the reader.
//!
//! This method must be called once on an object and must be successfully
//! called before any other method in this class may be called.
//!
//! \param[in] memory A memory reader for the remote process.
//! \param[in] address The address in the remote process' address space where
//! the ELF dynamic table is loaded.
//! \param[in] size The maximum number of bytes to read.
bool Initialize(const ProcessMemoryRange& memory,
VMAddress address,
VMSize size);
//! \brief Retrieve a value from the array.
//!
//! \param[in] tag Specifies which value should be retrieved. The possible
//! values for this parameter are the `DT_*` values from `<elf.h>`.
//! \param[in] log Specifies whether an error should be logged if \a tag is
//! not found.
//! \param[out] value The value, casted to an appropriate type, if found.
//! \return `true` if the value is found.
template <typename V>
bool GetValue(uint64_t tag, bool log, V* value) {
auto iter = values_.find(tag);
if (iter == values_.end()) {
LOG_IF(ERROR, log) << "tag not found";
return false;
}
return ReinterpretBytes(iter->second, value);
}
private:
std::map<uint64_t, uint64_t> values_;
};
} // namespace crashpad
#endif // CRASHPAD_SNAPSHOT_ELF_ELF_DYNAMIC_ARRAY_READER_H_