135 lines
3.5 KiB
C++
135 lines
3.5 KiB
C++
/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string>
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#include <qemud.h>
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#include <qemu_pipe_bp.h>
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#include <debug.h>
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#include "qemu_channel.h"
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namespace android {
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namespace hardware {
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namespace camera {
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namespace provider {
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namespace implementation {
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namespace hw {
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namespace {
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const char kServiceName[] = "camera";
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int qemuReceiveMessage(const int fd, std::vector<uint8_t>* data) {
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char len16[9];
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int e = qemu_pipe_read_fully(fd, len16, 8);
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if (e < 0) {
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return FAILURE(e);
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}
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len16[8] = 0;
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unsigned len;
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if (sscanf(len16, "%x", &len) != 1) {
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return FAILURE(-EINVAL);
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}
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data->resize(len);
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e = qemu_pipe_read_fully(fd, data->data(), len);
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if (e < 0) {
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return FAILURE(e);
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}
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return 0;
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}
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} // namespace
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base::unique_fd qemuOpenChannel() {
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return base::unique_fd(qemud_channel_open(kServiceName));
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}
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base::unique_fd qemuOpenChannel(const std::string_view param) {
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if (param.empty()) {
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return qemuOpenChannel();
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} else {
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return base::unique_fd(qemud_channel_open(
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(std::string(kServiceName) + ":" +
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std::string(param.begin(), param.end())).c_str()));
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}
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}
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int qemuRunQuery(const int fd,
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const char* const query,
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const size_t querySize,
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std::vector<uint8_t>* result) {
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static const uint8_t kZero = 0;
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static const uint8_t kSeparator = ' ';
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static const uint8_t kColon = ':';
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int e = qemu_pipe_write_fully(fd, query, querySize);
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if (e < 0) {
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return FAILURE(e);
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}
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std::vector<uint8_t> reply;
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e = qemuReceiveMessage(fd, &reply);
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if (e < 0) {
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return e;
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}
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if (reply.size() >= 3) {
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bool ok;
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if (!memcmp(reply.data(), "ok", 2)) {
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ok = true;
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} else if (!memcmp(reply.data(), "ko", 2)) {
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ok = false;
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} else {
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return FAILURE(-EBADE);
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}
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switch (reply[2]) {
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case kZero:
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return ok ? 0 : FAILURE(-EBADE);
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case kColon:
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if (!ok) {
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const int msgSize = reply.size() - 3;
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if (msgSize > 0) {
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return FAILURE_V(-EBADE, "failed to exec '%s' query with %.*s",
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query, msgSize, &reply[3]);
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} else {
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return FAILURE_V(-EBADE, "failed to exec '%s' query", query);
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}
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} else if (result) {
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reply.erase(reply.begin(), reply.begin() + 3);
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*result = std::move(reply);
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return result->size();
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} else {
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return reply.size() - 3;
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}
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default:
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return FAILURE(-EBADE);
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}
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} else {
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return FAILURE(-EBADE);
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}
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}
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} // namespace hw
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} // namespace implementation
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} // namespace provider
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} // namespace camera
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} // namespace hardware
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} // namespace android
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