1    :  // Copyright 2015 Google Inc. All Rights Reserved.
   2    :  //
   3    :  // Licensed under the Apache License, Version 2.0 (the "License");
   4    :  // you may not use this file except in compliance with the License.
   5    :  // You may obtain a copy of the License at
   6    :  //
   7    :  //     http://www.apache.org/licenses/LICENSE-2.0
   8    :  //
   9    :  // Unless required by applicable law or agreed to in writing, software
  10    :  // distributed under the License is distributed on an "AS IS" BASIS,
  11    :  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    :  // See the License for the specific language governing permissions and
  13    :  // limitations under the License.
  14    :  
  15    :  #include "syzygy/refinery/core/addressed_data.h"
  16    :  
  17    :  #include <stdint.h>
  18    :  
  19    :  namespace refinery {
  20    :  
  21  E :  AddressedData::AddressedData() : buffer_parser_(nullptr, 0) {
  22  E :  }
  23    :  
  24    :  AddressedData::AddressedData(const AddressRange& range, const void* data) :
  25  E :    range_(range), buffer_parser_(data, range.size()) {
  26  E :  }
  27    :  
  28  E :  bool AddressedData::GetAt(const AddressRange& range, void* data_ptr) {
  29  E :    DCHECK(range.IsValid());
  30    :  
  31    :    // Ensure the desired range is fully contained.
  32  E :    if (!range_.Contains(range))
  33  E :      return false;
  34    :  
  35    :    // Determine offset into the backing buffer.
  36  E :    Address offset = range.start() - range_.start();
  37    :    base::CheckedNumeric<size_t> checked_offset =
  38  E :        base::CheckedNumeric<size_t>::cast(offset);
  39  E :    if (!checked_offset.IsValid())
  40  i :      return false;
  41    :  
  42    :    // Copy bytes.
  43    :    const void* buffer_ptr;
  44    :    if (!buffer_parser_.GetAt(checked_offset.ValueOrDie(), range.size(),
  45  E :                              &buffer_ptr)) {
  46  i :      return false;
  47    :    }
  48  E :    memcpy(data_ptr, buffer_ptr, range.size());
  49  E :    return true;
  50  E :  }
  51    :  
  52  E :  bool AddressedData::Slice(size_t index, size_t len, AddressedData* slice) {
  53  E :    const void* inner_ptr = nullptr;
  54  E :    if (!buffer_parser_.GetAt(index, len, &inner_ptr))
  55  E :      return false;
  56    :  
  57  E :    *slice = AddressedData(AddressRange(range_.start() + index, len), inner_ptr);
  58  E :    return true;
  59  E :  }
  60    :  
  61    :  }  // namespace refinery