mirror of
https://github.com/akuker/RASCSI.git
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52c2aa474f
* Rebrand project to PiSCSI - rascsi ->piscsi - rasctl -> scsictl - rasdump -> scsidump - ras* -> piscsi* (rasutil -> piscsi_util, etc.) * Refined the formatting and wording of the app startup banner * Kept some references to rascsi and rasctl where backwards compatibility is concerned * Point to the new github repo URL Co-authored-by: nucleogenic <nr@nucleogenic.com> Co-authored-by: Uwe Seimet <Uwe.Seimet@seimet.de>
81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
//---------------------------------------------------------------------------
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//
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// SCSI Target Emulator PiSCSI
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// for Raspberry Pi
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//
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// Copyright (C) 2022 Uwe Seimet
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//
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//---------------------------------------------------------------------------
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#include "shared/protobuf_serializer.h"
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#include "shared/piscsi_exceptions.h"
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#include "generated/piscsi_interface.pb.h"
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#include <unistd.h>
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using namespace std;
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using namespace piscsi_interface;
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//---------------------------------------------------------------------------
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//
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// Serialize/Deserialize protobuf message: Length followed by the actual data.
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// A little endian platform is assumed.
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//
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//---------------------------------------------------------------------------
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void ProtobufSerializer::SerializeMessage(int fd, const google::protobuf::Message& message) const
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{
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string data;
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message.SerializeToString(&data);
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// Write the size of the protobuf data as a header
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auto size = static_cast<int32_t>(data.length());
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if (write(fd, &size, sizeof(size)) != sizeof(size)) {
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throw io_exception("Can't write protobuf message header");
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}
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// Write the actual protobuf data
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if (write(fd, data.data(), size) != size) {
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throw io_exception("Can't write protobuf message data");
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}
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}
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void ProtobufSerializer::DeserializeMessage(int fd, google::protobuf::Message& message) const
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{
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// Read the header with the size of the protobuf data
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vector<byte> header_buf(4);
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if (ReadBytes(fd, header_buf) < header_buf.size()) {
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throw io_exception("Invalid protobuf message header");
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}
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const int size = (static_cast<int>(header_buf[3]) << 24) + (static_cast<int>(header_buf[2]) << 16)
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+ (static_cast<int>(header_buf[1]) << 8) + static_cast<int>(header_buf[0]);
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if (size < 0) {
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throw io_exception("Invalid protobuf message header");
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}
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// Read the binary protobuf data
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vector<byte> data_buf(size);
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if (ReadBytes(fd, data_buf) < data_buf.size()) {
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throw io_exception("Missing protobuf message data");
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}
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// Create protobuf message
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string data((const char *)data_buf.data(), size);
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message.ParseFromString(data);
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}
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size_t ProtobufSerializer::ReadBytes(int fd, vector<byte>& buf) const
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{
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size_t offset = 0;
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while (offset < buf.size()) {
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const ssize_t len = read(fd, &buf.data()[offset], buf.size() - offset);
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if (len <= 0) {
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return len;
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}
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offset += len;
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}
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return offset;
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}
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