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#include "cru/base/io/Stream.h"
#include "cru/base/Exception.h"
#include "cru/base/Format.h"
#include <utility>
namespace cru::io {
StreamOperationNotSupportedException::StreamOperationNotSupportedException(
String operation)
: operation_(std::move(operation)) {
SetMessage(Format(u"Stream operation {} not supported.", operation_));
}
void StreamOperationNotSupportedException::CheckSeek(bool seekable) {
if (!seekable) throw StreamOperationNotSupportedException(u"seek");
}
void StreamOperationNotSupportedException::CheckRead(bool readable) {
if (!readable) throw StreamOperationNotSupportedException(u"read");
}
void StreamOperationNotSupportedException::CheckWrite(bool writable) {
if (!writable) throw StreamOperationNotSupportedException(u"write");
}
StreamClosedException::StreamClosedException()
: Exception(u"Stream is already closed.") {}
void StreamClosedException::Check(bool closed) {
if (closed) throw StreamClosedException();
}
Stream::Stream(SupportedOperations supported_operations)
: supported_operations_(std::move(supported_operations)), closed_(false) {}
Stream::Stream(std::optional<bool> can_seek, std::optional<bool> can_read,
std::optional<bool> can_write)
: Stream(SupportedOperations{can_seek, can_read, can_write}) {}
bool Stream::CanSeek() {
CheckClosed();
return DoCanSeek();
}
Index Stream::Seek(Index offset, SeekOrigin origin) {
CheckClosed();
StreamOperationNotSupportedException::CheckSeek(DoCanSeek());
return DoSeek(offset, origin);
}
Index Stream::Tell() {
CheckClosed();
return DoTell();
}
void Stream::Rewind() {
CheckClosed();
return DoRewind();
}
Index Stream::GetSize() {
CheckClosed();
return DoGetSize();
}
bool Stream::CanRead() {
CheckClosed();
return DoCanRead();
}
Index Stream::Read(std::byte* buffer, Index offset, Index size) {
CheckClosed();
StreamOperationNotSupportedException::CheckRead(DoCanRead());
return DoRead(buffer, offset, size);
}
Index Stream::Read(std::byte* buffer, Index size) {
return Read(buffer, 0, size);
}
Index Stream::Read(char* buffer, Index offset, Index size) {
return Read(reinterpret_cast<std::byte*>(buffer), offset, size);
}
Index Stream::Read(char* buffer, Index size) {
return Read(reinterpret_cast<std::byte*>(buffer), 0, size);
}
bool Stream::CanWrite() {
CheckClosed();
return DoCanWrite();
}
Index Stream::Write(const std::byte* buffer, Index offset, Index size) {
CheckClosed();
StreamOperationNotSupportedException::CheckWrite(DoCanWrite());
return DoWrite(buffer, offset, size);
}
Index Stream::Write(const std::byte* buffer, Index size) {
return Write(buffer, 0, size);
}
Index Stream::Write(const char* buffer, Index offset, Index size) {
return Write(reinterpret_cast<const std::byte*>(buffer), offset, size);
}
Index Stream::Write(const char* buffer, Index size) {
return Write(reinterpret_cast<const std::byte*>(buffer), size);
}
void Stream::Flush() {
CheckClosed();
DoFlush();
}
bool Stream::DoCanSeek() {
if (supported_operations_->can_seek) {
return *supported_operations_->can_seek;
} else {
throw Exception(
u"Can seek is neither set in supported_operations nor implemeted in "
u"virtual function.");
}
}
bool Stream::DoCanRead() {
if (supported_operations_->can_read) {
return *supported_operations_->can_read;
} else {
throw Exception(
u"Can read is neither set in supported_operations nor implemeted in "
u"virtual function.");
}
}
bool Stream::DoCanWrite() {
if (supported_operations_->can_write) {
return *supported_operations_->can_write;
} else {
throw Exception(
u"Can write is neither set in supported_operations nor implemeted in "
u"virtual function.");
}
}
Index Stream::DoSeek(Index offset, SeekOrigin origin) {
throw Exception(u"Stream is seekable but DoSeek is not implemented.");
}
Index Stream::DoTell() {
StreamOperationNotSupportedException::CheckSeek(DoCanSeek());
return DoSeek(0, SeekOrigin::Current);
}
void Stream::DoRewind() {
StreamOperationNotSupportedException::CheckSeek(DoCanSeek());
DoSeek(0, SeekOrigin::Begin);
}
Index Stream::DoGetSize() {
StreamOperationNotSupportedException::CheckSeek(DoCanSeek());
Index current_position = DoTell();
Seek(0, SeekOrigin::End);
Index size = DoTell();
Seek(current_position, SeekOrigin::Begin);
return size;
}
Index Stream::DoRead(std::byte* buffer, Index offset, Index size) {
throw Exception(u"Stream is readable but DoSeek is not implemented.");
}
Index Stream::DoWrite(const std::byte* buffer, Index offset, Index size) {
throw Exception(u"Stream is writable but DoSeek is not implemented.");
}
void Stream::DoFlush() {}
Buffer Stream::ReadToEnd(Index grow_size) {
Buffer buffer(grow_size);
while (true) {
auto read = Read(buffer.GetUsedEndPtr(), buffer.GetBackFree());
buffer.PushBackCount(read);
if (read == 0) {
break;
}
if (buffer.IsUsedReachEnd()) {
buffer.ResizeBuffer(buffer.GetBufferSize() + grow_size, true);
}
}
return buffer;
}
String Stream::ReadToEndAsUtf8String() {
auto buffer = ReadToEnd();
return String::FromUtf8(buffer);
}
} // namespace cru::io
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