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/*
* Copyright (c) 2014 Christian Authmann
*/
#include "binarystream.h"
#include <sstream>
#include <cstring> // memset(), strerror()
#include <memory>
#include <stdexcept>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
BinaryStream::BinaryStream(int read_fd, int write_fd) : is_eof(false), read_fd(read_fd), write_fd(write_fd) {
}
BinaryStream::~BinaryStream() {
close();
}
void BinaryStream::close() {
if (read_fd == write_fd)
write_fd = -1;
if (read_fd >= 0) {
::close(read_fd);
read_fd = -1;
}
if (write_fd >= 0) {
::close(write_fd);
write_fd = -1;
}
is_eof = true;
}
BinaryStream::BinaryStream(BinaryStream &&other) : is_eof(other.is_eof), read_fd(other.read_fd), write_fd(other.write_fd) {
other.is_eof = true;
other.read_fd = -1;
other.write_fd = -1;
}
BinaryStream &BinaryStream::operator=(BinaryStream &&other) {
std::swap(is_eof, other.is_eof);
std::swap(read_fd, other.read_fd);
std::swap(write_fd, other.write_fd);
return *this;
}
BinaryStream BinaryStream::connectToUnixSocket(const char *server_path) {
int new_fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (new_fd < 0)
throw stream_exception();
struct sockaddr_un server_addr;
memset((void *) &server_addr, 0, sizeof(server_addr));
server_addr.sun_family = AF_UNIX;
strcpy(server_addr.sun_path, server_path);
if (connect(new_fd, (sockaddr *) &server_addr, sizeof(server_addr)) == -1) {
::close(new_fd);
throw stream_exception();
}
return BinaryStream(new_fd, new_fd);
}
void BinaryStream::write(const char *buffer, size_t len) {
if (write_fd < 0)
throw stream_exception();
//printf("Stream: writing %lu bytes\n", len);
auto res = ::write(write_fd, buffer, len);
if (res < 0 || (size_t) res != len) {
// strerror(errno);
throw stream_exception();
}
}
size_t BinaryStream::read(char *buffer, size_t len) {
if (read_fd < 0 || is_eof)
throw stream_exception();
//printf("Stream: reading %lu bytes\n", len);
size_t remaining = len;
size_t bytes_read = 0;
while (remaining > 0) {
auto r = ::read(read_fd, buffer, remaining);
if (r == 0) {
is_eof = true;
throw stream_exception();
}
if (r < 0) {
// strerror(errno);
throw stream_exception();
}
bytes_read += r;
buffer += r;
remaining -= r;
}
if (bytes_read != len)
throw stream_exception();
return bytes_read;
}
namespace serialization {
// Strings
void serializer<std::string>::serialize(BinaryStream &stream, const std::string &string) {
size_t len = string.size();
if (len > (size_t) (1<<31))
throw BinaryStream::stream_exception();
stream.write(len);
stream.write(string.data(), len);
}
std::string serializer<std::string>::deserialize(BinaryStream &stream) {
auto len = stream.read<size_t>();
if (len == 0)
return "";
if (len > (size_t) (1<<31))
throw BinaryStream::stream_exception();
std::unique_ptr<char[]> buffer( new char[len] );
stream.read(buffer.get(), len);
std::string string(buffer.get(), len);
return string;
}
// Vectors
template <typename T>
void serializer<std::vector<T>>::serialize(BinaryStream &stream, const std::vector<T> &vec) {
size_t size = vec.size();
if (size > (size_t) (1<<31))
throw BinaryStream::stream_exception();
stream.write(size);
for (size_t i=0;i<size;i++)
stream.write(vec[i]);
}
template <typename T>
std::vector<T> serializer<std::vector<T>>::deserialize(BinaryStream &stream) {
std::vector<T> vec;
auto size = stream.read<size_t>();
if (size > (size_t) (1<<31))
throw BinaryStream::stream_exception();
vec.reserve(size);
for (size_t i=0;i<size;i++)
vec.push_back(stream.read<T>());
return vec;
};
// Note: when adding more serializers, don't forget to add their declaration in binarystream.h!
// Make sure to instantiate the vectors we need
template struct serializer<std::vector<int8_t>>;
template struct serializer<std::vector<uint8_t>>;
template struct serializer<std::vector<int16_t>>;
template struct serializer<std::vector<uint16_t>>;
template struct serializer<std::vector<int32_t>>;
template struct serializer<std::vector<uint32_t>>;
template struct serializer<std::vector<int64_t>>;
template struct serializer<std::vector<uint64_t>>;
template struct serializer<std::vector<float>>;
template struct serializer<std::vector<double>>;
template struct serializer<std::vector<std::string>>;
}
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