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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/extensions/file_manager/file_stream_md5_digester.h"
#include <string_view>
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "net/base/net_errors.h"
#include "storage/browser/file_system/file_stream_reader.h"
namespace drive {
namespace util {
namespace {
const int kMd5DigestBufferSize = 512 * 1024; // 512 kB.
} // namespace
FileStreamMd5Digester::FileStreamMd5Digester()
: buffer_(
base::MakeRefCounted<net::IOBufferWithSize>(kMd5DigestBufferSize)) {}
FileStreamMd5Digester::~FileStreamMd5Digester() = default;
void FileStreamMd5Digester::GetMd5Digest(
std::unique_ptr<storage::FileStreamReader> stream_reader,
ResultCallback callback) {
// Only one digest can be running at a time.
DCHECK(callback_.is_null());
callback_ = std::move(callback);
reader_ = std::move(stream_reader);
base::MD5Init(&md5_context_);
// Start the read/hash.
ReadNextChunk();
}
void FileStreamMd5Digester::ReadNextChunk() {
const int result =
reader_->Read(buffer_.get(), kMd5DigestBufferSize,
base::BindOnce(&FileStreamMd5Digester::OnChunkRead, this));
if (result != net::ERR_IO_PENDING) {
OnChunkRead(result);
}
}
void FileStreamMd5Digester::OnChunkRead(int bytes_read) {
if (bytes_read < 0) {
// Error - just return empty string.
std::move(callback_).Run("");
return;
} else if (bytes_read == 0) {
// EOF.
base::MD5Digest digest;
base::MD5Final(&digest, &md5_context_);
std::string result = base::MD5DigestToBase16(digest);
std::move(callback_).Run(std::move(result));
return;
}
// Read data and digest it.
base::MD5Update(&md5_context_, std::string_view(buffer_->data(), bytes_read));
// Kick off the next read.
ReadNextChunk();
}
} // namespace util
} // namespace drive
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