RASCSI/cpp/shared/protobuf_util.cpp

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//---------------------------------------------------------------------------
//
// SCSI Target Emulator PiSCSI
// for Raspberry Pi
//
// Copyright (C) 2021-2023 Uwe Seimet
//
//---------------------------------------------------------------------------
#include "shared/piscsi_exceptions.h"
#include "piscsi_util.h"
#include "protobuf_util.h"
#include <unistd.h>
#include <sstream>
#include <array>
#include <vector>
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#include <iomanip>
using namespace std;
using namespace piscsi_util;
using namespace piscsi_interface;
#define FPRT(fp, ...) fprintf(fp, __VA_ARGS__ )
void protobuf_util::ParseParameters(PbDeviceDefinition& device, const string& params)
{
if (params.empty()) {
return;
}
// Old style parameter (filename), for backwards compatibility only
if (params.find(KEY_VALUE_SEPARATOR) == string::npos) {
SetParam(device, "file", params);
return;
}
for (const auto& p : Split(params, COMPONENT_SEPARATOR)) {
if (const auto& param = Split(p, KEY_VALUE_SEPARATOR, 2); param.size() == 2) {
SetParam(device, param[0], param[1]);
}
}
}
void protobuf_util::SetCommandParams(PbCommand& command, const string& params)
{
string folder_pattern;
string file_pattern;
string operations;
switch (const auto& components = Split(params, COMPONENT_SEPARATOR, 3); components.size()) {
case 3:
operations = components[2];
[[fallthrough]];
case 2:
folder_pattern = components[0];
file_pattern = components[1];
break;
case 1:
file_pattern = components[0];
break;
default:
break;
}
SetParam(command, "folder_pattern", folder_pattern);
SetParam(command, "file_pattern", file_pattern);
SetParam(command, "operations", operations);
}
void protobuf_util::SetProductData(PbDeviceDefinition& device, const string& data)
{
const auto& components = Split(data, COMPONENT_SEPARATOR, 3);
switch (components.size()) {
case 3:
device.set_revision(components[2]);
[[fallthrough]];
case 2:
device.set_product(components[1]);
[[fallthrough]];
case 1:
device.set_vendor(components[0]);
break;
default:
break;
}
}
string protobuf_util::SetIdAndLun(PbDeviceDefinition& device, const string& value)
{
int id;
int lun;
if (const string error = ProcessId(value, id, lun); !error.empty()) {
return error;
}
device.set_id(id);
device.set_unit(lun != -1 ? lun : 0);
return "";
}
string protobuf_util::ListDevices(const vector<PbDevice>& pb_devices)
{
if (pb_devices.empty()) {
return "No devices currently attached.\n";
}
ostringstream s;
s << "+----+-----+------+-------------------------------------\n"
<< "| ID | LUN | TYPE | IMAGE FILE\n"
<< "+----+-----+------+-------------------------------------\n";
vector<PbDevice> devices = pb_devices;
ranges::sort(devices, [](const auto& a, const auto& b) { return a.id() < b.id() || a.unit() < b.unit(); });
for (const auto& device : devices) {
string filename;
switch (device.type()) {
case SCBR:
filename = "X68000 HOST BRIDGE";
break;
case SCDP:
filename = "DaynaPort SCSI/Link";
break;
case SCHS:
filename = "Host Services";
break;
case SCLP:
filename = "SCSI Printer";
break;
default:
filename = device.file().name();
break;
}
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s << "| " << device.id() << " | " << setw(3) << device.unit() << " | " << PbDeviceType_Name(device.type()) << " | "
<< (filename.empty() ? "NO MEDIUM" : filename)
<< (!device.status().removed() && (device.properties().read_only() || device.status().protected_()) ? " (READ-ONLY)" : "")
<< '\n';
}
s << "+----+-----+------+-------------------------------------\n";
return s.str();
}
//---------------------------------------------------------------------------
//
// Serialize/Deserialize protobuf message: Length followed by the actual data.
// A little endian platform is assumed.
//
//---------------------------------------------------------------------------
void protobuf_util::SerializeMessage(int fd, const google::protobuf::Message& message)
{
const string data = message.SerializeAsString();
// Write the size of the protobuf data as a header
const auto size = static_cast<int32_t>(data.length());
if (write(fd, &size, sizeof(size)) != sizeof(size)) {
throw io_exception("Can't write protobuf message size");
}
// Write the actual protobuf data
if (write(fd, data.data(), size) != size) {
throw io_exception("Can't write protobuf message data");
}
}
void protobuf_util::DeserializeMessage(int fd, google::protobuf::Message& message)
{
// Read the header with the size of the protobuf data
array<byte, sizeof(int32_t)> header_buf;
if (ReadBytes(fd, header_buf) < header_buf.size()) {
throw io_exception("Can't read protobuf message size");
}
const int size = (static_cast<int>(header_buf[3]) << 24) + (static_cast<int>(header_buf[2]) << 16)
+ (static_cast<int>(header_buf[1]) << 8) + static_cast<int>(header_buf[0]);
if (size < 0) {
throw io_exception("Invalid protobuf message size");
}
// Read the binary protobuf data
vector<byte> data_buf(size);
if (ReadBytes(fd, data_buf) != data_buf.size()) {
throw io_exception("Invalid protobuf message data");
}
message.ParseFromArray(data_buf.data(), size);
}
size_t protobuf_util::ReadBytes(int fd, span<byte> buf)
{
size_t offset = 0;
while (offset < buf.size()) {
const auto len = read(fd, &buf.data()[offset], buf.size() - offset);
if (len == -1) {
throw io_exception("Read error: " + string(strerror(errno)));
}
if (!len) {
break;
}
offset += len;
}
return offset;
}