| // Copyright 2018 The Crashpad Authors. All rights reserved. |
| // |
| // 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. |
| |
| #include "util/process/process_memory.h" |
| |
| #include "base/logging.h" |
| |
| namespace crashpad { |
| |
| bool ProcessMemory::Read(VMAddress address, size_t size, void* buffer) const { |
| char* buffer_c = static_cast<char*>(buffer); |
| while (size > 0) { |
| ssize_t bytes_read = ReadUpTo(address, size, buffer_c); |
| if (bytes_read < 0) { |
| return false; |
| } |
| if (bytes_read == 0) { |
| LOG(ERROR) << "short read"; |
| return false; |
| } |
| DCHECK_LE(static_cast<size_t>(bytes_read), size); |
| size -= bytes_read; |
| address += bytes_read; |
| buffer_c += bytes_read; |
| } |
| return true; |
| } |
| |
| bool ProcessMemory::ReadCStringInternal(VMAddress address, |
| bool has_size, |
| size_t size, |
| std::string* string) const { |
| string->clear(); |
| |
| char buffer[4096]; |
| do { |
| size_t read_size; |
| if (has_size) { |
| read_size = std::min(sizeof(buffer), size); |
| } else { |
| read_size = sizeof(buffer); |
| } |
| |
| ssize_t bytes_read = ReadUpTo(address, read_size, buffer); |
| if (bytes_read < 0) { |
| return false; |
| } |
| if (bytes_read == 0) { |
| break; |
| } |
| |
| char* nul = static_cast<char*>(memchr(buffer, '\0', bytes_read)); |
| if (nul != nullptr) { |
| string->append(buffer, nul - buffer); |
| return true; |
| } |
| string->append(buffer, bytes_read); |
| |
| address += bytes_read; |
| size -= bytes_read; |
| } while (!has_size || size > 0); |
| |
| LOG(ERROR) << "unterminated string"; |
| return false; |
| } |
| |
| } // namespace crashpad |