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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "mojo/public/cpp/system/data_pipe_utils.h"
#include <utility>
#include "base/containers/span.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/strings/string_view_util.h"
#include "mojo/public/cpp/system/wait.h"
namespace mojo {
namespace {
bool BlockingCopyHelper(
ScopedDataPipeConsumerHandle source,
base::RepeatingCallback<size_t(base::span<const uint8_t>)> write_bytes) {
for (;;) {
base::span<const uint8_t> buffer;
MojoResult result = source->BeginReadData(MOJO_READ_DATA_FLAG_NONE, buffer);
if (result == MOJO_RESULT_OK) {
size_t bytes_written = write_bytes.Run(buffer);
result = source->EndReadData(buffer.size());
if (bytes_written < buffer.size() || result != MOJO_RESULT_OK) {
return false;
}
} else if (result == MOJO_RESULT_SHOULD_WAIT) {
result = Wait(source.get(), MOJO_HANDLE_SIGNAL_READABLE);
if (result != MOJO_RESULT_OK) {
// If the producer handle was closed, then treat as EOF.
return result == MOJO_RESULT_FAILED_PRECONDITION;
}
} else if (result == MOJO_RESULT_FAILED_PRECONDITION) {
// If the producer handle was closed, then treat as EOF.
return true;
} else {
// Some other error occurred.
break;
}
}
return false;
}
size_t CopyToStringHelper(std::string* result,
base::span<const uint8_t> buffer) {
result->append(base::as_string_view(buffer));
return buffer.size();
}
} // namespace
// TODO(hansmuller): Add a max_size parameter.
bool BlockingCopyToString(ScopedDataPipeConsumerHandle source,
std::string* result) {
CHECK(result);
result->clear();
return BlockingCopyHelper(std::move(source),
base::BindRepeating(&CopyToStringHelper, result));
}
bool MOJO_CPP_SYSTEM_EXPORT
BlockingCopyFromString(const std::string& source_str,
const ScopedDataPipeProducerHandle& destination) {
base::span<const uint8_t> source = base::as_byte_span(source_str);
while (!source.empty()) {
base::span<uint8_t> dest;
size_t size_hint = source.size();
MojoResult result =
destination->BeginWriteData(size_hint, MOJO_WRITE_DATA_FLAG_NONE, dest);
if (result == MOJO_RESULT_OK) {
size_t copy_size = std::min(source.size(), dest.size());
dest.copy_prefix_from(source.first(copy_size));
destination->EndWriteData(copy_size);
source = source.subspan(copy_size);
} else if (result == MOJO_RESULT_SHOULD_WAIT) {
result = Wait(destination.get(), MOJO_HANDLE_SIGNAL_WRITABLE);
if (result != MOJO_RESULT_OK) {
// If the consumer handle was closed, then treat as EOF.
return result == MOJO_RESULT_FAILED_PRECONDITION;
}
} else {
// If the consumer handle was closed, then treat as EOF.
return result == MOJO_RESULT_FAILED_PRECONDITION;
}
}
return true;
}
} // namespace mojo
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