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streams.h
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streams.h
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/******************************************************************************
* This file is part of dirtsand. *
* *
* dirtsand is free software: you can redistribute it and/or modify *
* it under the terms of the GNU Affero General Public License as *
* published by the Free Software Foundation, either version 3 of the *
* License, or (at your option) any later version. *
* *
* dirtsand is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Affero General Public License for more details. *
* *
* You should have received a copy of the GNU Affero General Public License *
* along with dirtsand. If not, see <http://www.gnu.org/licenses/>. *
******************************************************************************/
#ifndef _DS_STREAMS_H
#define _DS_STREAMS_H
#include <string_theory/string>
#include <atomic>
#include <stdexcept>
#include <cstdio>
#include <cstring>
namespace DS
{
class EofException : public std::runtime_error
{
public:
EofException()
: std::runtime_error("[EofException] Unexpected end of stream") { }
};
class FileIOException : public std::runtime_error
{
public:
explicit FileIOException(const char* msg)
: std::runtime_error(std::string("[FileIOException] ") + msg) { }
};
enum StringType
{
// Type of string to encode/decode from stream sources
e_StringRAW8, e_StringUTF8, e_StringUTF16,
};
class Stream
{
public:
Stream() { }
virtual ~Stream() { }
virtual ssize_t readBytes(void* buffer, size_t count) = 0;
virtual ssize_t writeBytes(const void* buffer, size_t count) = 0;
template <typename tp, typename stream_type = tp> tp read()
{
stream_type value;
if (readBytes(&value, sizeof(value)) != sizeof(value))
throw EofException();
return static_cast<tp>(value);
}
ST::string readString(size_t length, DS::StringType format = e_StringRAW8);
ST::string readSafeString(DS::StringType format = e_StringRAW8);
template <typename tp, typename stream_type = tp> void write(tp value)
{
auto svalue = static_cast<stream_type>(value);
writeBytes(&svalue, sizeof(svalue));
}
template <typename sz_t>
ST::string readPString(DS::StringType format = e_StringRAW8)
{
sz_t length = read<sz_t>();
return readString(length);
}
template <typename sz_t>
void writePString(const ST::string& value, DS::StringType format = e_StringRAW8)
{
if (format == e_StringUTF16) {
ST::utf16_buffer buffer = value.to_utf16();
write<sz_t>(buffer.size());
writeBytes(buffer.data(), buffer.size() * sizeof(char16_t));
} else {
ST::char_buffer buffer = (format == e_StringUTF8) ? value.to_utf8()
: value.to_latin_1();
write<sz_t>(buffer.size());
writeBytes(buffer.data(), buffer.size() * sizeof(char));
}
}
void writeString(const ST::string& value, DS::StringType format = e_StringRAW8);
void writeSafeString(const ST::string& value, DS::StringType format = e_StringRAW8);
virtual uint32_t tell() const = 0;
virtual void seek(int32_t offset, int whence) = 0;
virtual uint32_t size() const = 0;
virtual bool atEof() = 0;
virtual void flush() = 0;
};
// Special cases for bool
template <> inline bool Stream::read<bool>()
{ return read<uint8_t>() != 0; }
template <> inline void Stream::write<bool>(bool value)
{ write<uint8_t>(value ? 1 : 0); }
/* Stream for reading/writing regular files */
class FileStream : public Stream
{
public:
FileStream() : m_file() { }
~FileStream() override { close(); }
void open(const char* filename, const char* mode);
void close()
{
if (m_file)
fclose(m_file);
m_file = nullptr;
}
ssize_t readBytes(void* buffer, size_t count) override
{ return fread(buffer, 1, count, m_file); }
ssize_t writeBytes(const void* buffer, size_t count) override
{ return fwrite(buffer, 1, count, m_file); }
uint32_t tell() const override { return static_cast<uint32_t>(ftell(m_file)); }
void seek(int32_t offset, int whence) override;
uint32_t size() const override;
bool atEof() override;
void flush() override { fflush(m_file); }
private:
FILE* m_file;
};
/* Read/Write RAM stream */
class BufferStream : public Stream
{
public:
BufferStream() : m_buffer(), m_position(), m_size(), m_alloc(), m_refs(1) { }
BufferStream(const void* data, size_t size) : m_buffer(), m_refs(1) { set(data, size); }
~BufferStream() override { delete[] m_buffer; }
ssize_t readBytes(void* buffer, size_t count) override;
ssize_t writeBytes(const void* buffer, size_t count) override;
uint32_t tell() const override { return static_cast<uint32_t>(m_position); }
void seek(int32_t offset, int whence) override;
uint32_t size() const override { return m_size; }
bool atEof() override { return m_position >= m_size; }
void flush() override { }
void truncate()
{
m_size = 0;
m_position = 0;
}
const uint8_t* buffer() const { return m_buffer; }
void set(const void* buffer, size_t size);
void steal(uint8_t* buffer, size_t size);
void ref() { ++m_refs; }
void unref()
{
if (--m_refs == 0)
delete this;
}
private:
uint8_t* m_buffer;
size_t m_position;
size_t m_size, m_alloc;
std::atomic_int m_refs;
BufferStream(const BufferStream& copy) { }
void operator=(const BufferStream& copy) { }
};
/* Read-only non-copyable RAM stream */
class Blob
{
public:
Blob() noexcept : m_buffer(), m_size() { }
Blob(const uint8_t* buffer, size_t size)
{
auto bufcopy = new uint8_t[size];
memcpy(bufcopy, buffer, size);
m_buffer = const_cast<const uint8_t*>(bufcopy);
m_size = size;
}
Blob(Blob&& other) noexcept
: m_buffer(other.m_buffer), m_size(other.m_size)
{
other.m_buffer = nullptr;
}
~Blob() noexcept { delete[] m_buffer; }
Blob(const Blob&) = delete;
Blob& operator=(const Blob&) = delete;
Blob& operator=(Blob&& other) noexcept
{
m_buffer = other.m_buffer;
m_size = other.m_size;
other.m_buffer = nullptr;
return *this;
}
static Blob Steal(const uint8_t* buffer, size_t size)
{
Blob b;
b.m_buffer = buffer;
b.m_size = size;
return b;
}
template <size_t length>
static Blob FromString(const char (&text)[length])
{
// Subtract one character for the nul-terminator
return Blob(reinterpret_cast<const uint8_t*>(text), length - 1);
}
const uint8_t* buffer() const { return m_buffer; }
size_t size() const { return m_size; }
Blob copy() const
{
return Blob(buffer(), size());
}
private:
const uint8_t* m_buffer;
size_t m_size;
};
class BlobStream : public Stream
{
public:
explicit BlobStream(const Blob& blob) : m_blob(blob), m_position(0) { }
explicit BlobStream(Blob&&) = delete; // Prevent dangling references
~BlobStream() override { }
ssize_t readBytes(void* buffer, size_t count) override;
ssize_t writeBytes(const void* buffer, size_t count) override;
uint32_t tell() const override { return static_cast<uint32_t>(m_position); }
void seek(int32_t offset, int whence) override;
uint32_t size() const override { return static_cast<uint32_t>(m_blob.size()); }
bool atEof() override { return tell() >= size(); }
void flush() override { }
private:
const Blob& m_blob;
size_t m_position;
};
Blob Base64Decode(const ST::string& value);
Blob HexDecode(const ST::string& value);
}
#endif