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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/fuchsia/mem_buffer_util.h"
#include <lib/fdio/io.h>
#include <lib/zx/vmo.h>
#include <string>
#include <string_view>
#include <utility>
#include "base/files/file.h"
#include "base/fuchsia/fuchsia_logging.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/utf_string_conversions.h"
namespace base {
std::optional<std::u16string> ReadUTF8FromVMOAsUTF16(
const fuchsia::mem::Buffer& buffer) {
std::optional<std::string> output_utf8 = StringFromMemBuffer(buffer);
if (!output_utf8) {
return std::nullopt;
}
std::u16string output;
return UTF8ToUTF16(output_utf8->data(), output_utf8->size(), &output)
? std::optional<std::u16string>(std::move(output))
: std::nullopt;
}
zx::vmo VmoFromString(std::string_view data, std::string_view name) {
zx::vmo vmo;
// The `ZX_PROP_VMO_CONTENT_SIZE` property is automatically set on VMO
// creation.
zx_status_t status = zx::vmo::create(data.size(), 0, &vmo);
ZX_CHECK(status == ZX_OK, status) << "zx_vmo_create";
status = vmo.set_property(ZX_PROP_NAME, name.data(), name.size());
ZX_DCHECK(status == ZX_OK, status);
if (data.size() > 0) {
status = vmo.write(data.data(), 0, data.size());
ZX_CHECK(status == ZX_OK, status) << "zx_vmo_write";
}
return vmo;
}
fuchsia::mem::Buffer MemBufferFromString(std::string_view data,
std::string_view name) {
fuchsia::mem::Buffer buffer;
buffer.vmo = VmoFromString(data, name);
buffer.size = data.size();
return buffer;
}
fuchsia::mem::Buffer MemBufferFromString16(std::u16string_view data,
std::string_view name) {
return MemBufferFromString(
std::string_view(reinterpret_cast<const char*>(data.data()),
data.size() * sizeof(char16_t)),
name);
}
std::optional<std::string> StringFromVmo(const zx::vmo& vmo) {
std::string result;
size_t size;
zx_status_t status = vmo.get_prop_content_size(&size);
if (status != ZX_OK) {
ZX_LOG(ERROR, status) << "zx::vmo::get_prop_content_size";
return std::nullopt;
}
if (size == 0) {
return result;
}
result.resize(size);
status = vmo.read(&result[0], 0, size);
if (status == ZX_OK) {
return result;
}
ZX_LOG(ERROR, status) << "zx_vmo_read";
return std::nullopt;
}
std::optional<std::string> StringFromMemBuffer(
const fuchsia::mem::Buffer& buffer) {
std::string result;
if (buffer.size == 0) {
return result;
}
result.resize(buffer.size);
zx_status_t status = buffer.vmo.read(&result[0], 0, buffer.size);
if (status == ZX_OK) {
return result;
}
ZX_LOG(ERROR, status) << "zx_vmo_read";
return std::nullopt;
}
std::optional<std::string> StringFromMemData(const fuchsia::mem::Data& data) {
switch (data.Which()) {
case fuchsia::mem::Data::kBytes: {
const std::vector<uint8_t>& bytes = data.bytes();
return std::string(bytes.begin(), bytes.end());
}
case fuchsia::mem::Data::kBuffer:
return StringFromMemBuffer(data.buffer());
case fuchsia::mem::Data::kUnknown:
case fuchsia::mem::Data::Invalid:
// TODO(fxbug.dev/66155): Determine whether to use a default case instead.
break;
}
return std::nullopt;
}
fuchsia::mem::Buffer MemBufferFromFile(File file) {
if (!file.IsValid()) {
return {};
}
zx::vmo vmo;
zx_status_t status =
fdio_get_vmo_copy(file.GetPlatformFile(), vmo.reset_and_get_address());
if (status != ZX_OK) {
ZX_LOG(ERROR, status) << "fdio_get_vmo_copy";
return {};
}
fuchsia::mem::Buffer output;
output.vmo = std::move(vmo);
output.size = checked_cast<uint64_t>(file.GetLength());
return output;
}
fuchsia::mem::Buffer CloneBuffer(const fuchsia::mem::Buffer& buffer,
std::string_view name) {
fuchsia::mem::Buffer output;
output.size = buffer.size;
zx_status_t status = buffer.vmo.create_child(
ZX_VMO_CHILD_SNAPSHOT_AT_LEAST_ON_WRITE, 0, buffer.size, &output.vmo);
ZX_CHECK(status == ZX_OK, status) << "zx_vmo_create_child";
status = output.vmo.set_property(ZX_PROP_NAME, name.data(), name.size());
ZX_DCHECK(status == ZX_OK, status);
return output;
}
} // namespace base
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