| // Copyright 2019 The Cobalt 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 "starboard/shared/starboard/player/file_cache_reader.h" |
| |
| #include <algorithm> |
| |
| #include "starboard/common/log.h" |
| #include "starboard/directory.h" |
| #include "starboard/memory.h" |
| |
| namespace starboard { |
| namespace shared { |
| namespace starboard { |
| namespace player { |
| |
| namespace { |
| |
| // Accepts test file name and returns the complete file path based on the path: |
| // "<content path>/test/starboard/shared/starboard/player/testdata". |
| std::string ResolveTestFileName(const char* filename) { |
| SB_CHECK(filename); |
| |
| std::vector<char> content_path(kSbFileMaxPath + 1); |
| SB_CHECK(SbSystemGetPath(kSbSystemPathContentDirectory, content_path.data(), |
| content_path.size())); |
| std::string directory_path = std::string(content_path.data()) + |
| kSbFileSepChar + "test" + kSbFileSepChar + |
| "starboard" + kSbFileSepChar + "shared" + |
| kSbFileSepChar + "starboard" + kSbFileSepChar + |
| "player" + kSbFileSepChar + "testdata"; |
| |
| SB_CHECK(SbDirectoryCanOpen(directory_path.c_str())) |
| << "Cannot open directory " << directory_path; |
| return directory_path + kSbFileSepChar + filename; |
| } |
| |
| } // namespace |
| |
| FileCacheReader::FileCacheReader(const char* filename, int file_cache_size) |
| : absolute_path_(ResolveTestFileName(filename)), |
| default_file_cache_size_(file_cache_size) {} |
| |
| int FileCacheReader::Read(void* out_buffer, int bytes_to_read) { |
| EnsureFileOpened(); |
| |
| int total_bytes_read = 0; |
| |
| while (bytes_to_read > 0 && file_cache_.size() != 0) { |
| int bytes_read = ReadFromCache( |
| static_cast<char*>(out_buffer) + total_bytes_read, bytes_to_read); |
| SB_CHECK(bytes_read >= 0); |
| bytes_to_read -= bytes_read; |
| total_bytes_read += bytes_read; |
| RefillCacheIfEmpty(); |
| } |
| |
| return total_bytes_read; |
| } |
| |
| const std::string& FileCacheReader::GetAbsolutePathName() const { |
| return absolute_path_; |
| } |
| |
| int64_t FileCacheReader::GetSize() { |
| EnsureFileOpened(); |
| return file_->GetSize(); |
| } |
| |
| void FileCacheReader::EnsureFileOpened() { |
| if (file_) { |
| return; |
| } |
| file_.reset( |
| new ScopedFile(absolute_path_.c_str(), kSbFileOpenOnly | kSbFileRead)); |
| SB_CHECK(file_->IsValid()); |
| |
| max_file_cache_size_ = |
| std::min(default_file_cache_size_, static_cast<int>(file_->GetSize())); |
| file_cache_.resize(max_file_cache_size_); |
| file_cache_offset_ = max_file_cache_size_; |
| } |
| |
| int FileCacheReader::ReadFromCache(void* out_buffer, int bytes_to_read) { |
| SB_CHECK(file_cache_offset_ <= file_cache_.size()); |
| bytes_to_read = std::min( |
| static_cast<int>(file_cache_.size()) - file_cache_offset_, bytes_to_read); |
| memcpy(out_buffer, file_cache_.data() + file_cache_offset_, bytes_to_read); |
| file_cache_offset_ += bytes_to_read; |
| return bytes_to_read; |
| } |
| |
| void FileCacheReader::RefillCacheIfEmpty() { |
| if (file_cache_offset_ != file_cache_.size()) { |
| return; |
| } |
| file_cache_offset_ = 0; |
| int bytes_read = file_->ReadAll(file_cache_.data(), file_cache_.size()); |
| SB_CHECK(bytes_read >= 0); |
| if (bytes_read < static_cast<int>(file_cache_.size())) { |
| file_cache_.resize(bytes_read); |
| } |
| } |
| |
| } // namespace player |
| } // namespace starboard |
| } // namespace shared |
| } // namespace starboard |