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//
// 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 "runtime/util/file_data_stream.h"
#include <cstdint>
#include <fstream>
#include <ios>
#include <memory>
#include <string>
#include <utility>
#include "absl/status/status.h" // from @com_google_absl
#include "absl/status/statusor.h" // from @com_google_absl
#include "absl/strings/str_cat.h" // from @com_google_absl
namespace litert::lm {
absl::StatusOr<std::shared_ptr<FileDataStream>> FileDataStream::Create(
const std::string& file_path) {
std::ifstream file(file_path, std::ios::binary);
if (!file.is_open()) {
return absl::NotFoundError(
absl::StrCat("Failed to open file: ", file_path));
}
// Cannot use std::make_shared because constructor is private.
return std::shared_ptr<FileDataStream>(new FileDataStream(std::move(file)));
}
FileDataStream::FileDataStream(std::ifstream file) : file_(std::move(file)) {}
FileDataStream::~FileDataStream() = default;
absl::Status FileDataStream::ReadAndDiscard(void* buffer, uint64_t offset,
uint64_t size) {
return ReadAndPreserve(buffer, offset, size);
}
absl::Status FileDataStream::ReadAndPreserve(void* buffer, uint64_t offset,
uint64_t size) {
if (!file_.is_open()) {
return absl::InternalError("File is not open.");
}
file_.clear();
file_.seekg(offset, std::ios::beg);
if (file_.fail()) {
return absl::InternalError(
absl::StrCat("Failed to seek to offset ", offset));
}
file_.read(static_cast<char*>(buffer), size);
if (static_cast<uint64_t>(file_.gcount()) != size) {
return absl::OutOfRangeError(
absl::StrCat("Read past end of file. Requested ", size,
" bytes, but only ", file_.gcount(), " bytes were read."));
}
return absl::OkStatus();
}
absl::Status FileDataStream::Discard(uint64_t offset, uint64_t size) {
// Discard is a no-op for a random-access file stream.
return absl::OkStatus();
}
} // namespace litert::lm
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