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/* Starshatter: The Open Source Project
Copyright (c) 2021-2024, Starshatter: The Open Source Project Contributors
Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
Copyright (c) 1997-2006, Destroyer Studios LLC.
*/
#include <algorithm>
#include <cstring>
#include <memory>
#include <utility>
#include <starshatter/foundation/reader.h>
namespace starshatter
{
namespace foundation
{
// If extension is needed, use type_traits or update to C++20 and use concepts
inline bool ok(const char* data) { return data != nullptr; }
inline bool ok(const std::unique_ptr<const char[]>& data) { return static_cast<bool>(data); }
inline const char* at(const char* data) { return data; }
inline const char* at(const std::unique_ptr<const char[]>& data) { return data.get(); }
template <typename Source>
BufferReader<Source>::BufferReader()
{
}
template <typename Source>
BufferReader<Source>::BufferReader(Source src) :
buffer {std::move(src)},
size {std::strlen(at(buffer)) + 1}
{
}
template <typename Source>
BufferReader<Source>::BufferReader(Source src, Count bytes) :
buffer {std::move(src)},
size {bytes}
{
}
template <typename Source>
bool
BufferReader<Source>::valid() const
{
return ok(buffer);
}
template <typename Source>
Count
BufferReader<Source>::available() const
{
return size - position;
}
template <typename Source>
Count
BufferReader<Source>::seek(Count pos)
{
position = pos;
if (position > size)
position = size;
return position;
}
template <typename Source>
Count
BufferReader<Source>::seek(Offset offset, Direction dir)
{
switch (dir) {
case Direction::Start:
break; // no-op
case Direction::End:
offset = size + offset;
break;
case Direction::Current:
offset = position + offset;
break;
}
position = static_cast<Count>(std::clamp<Offset>(offset, 0, size));
return position;
}
template <typename Source>
Count
BufferReader<Source>::read(char* dest)
{
return read(dest, available());
}
template <typename Source>
Count
BufferReader<Source>::read(char* dest, Count bytes)
{
bytes = peek(dest, bytes);
position += bytes;
return bytes;
}
template <typename Source>
Count
BufferReader<Source>::peek(char* dest) const
{
return peek(dest, available());
}
template <typename Source>
Count
BufferReader<Source>::peek(char* dest, Count bytes) const
{
bytes = std::min(bytes, available());
std::copy(data(), data() + bytes, dest);
return bytes;
}
template <typename Source>
const char*
BufferReader<Source>::data() const
{
return at(buffer) + position;
}
} // namespace foundation
} // namespace starshatter
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