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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/crt/StlAllocator.h>
#include <aws/crt/io/Stream.h>
#include <aws/io/stream.h>
namespace Aws
{
namespace Crt
{
namespace Io
{
InputStream::~InputStream()
{
// DO NOTHING: for now. But keep this here because it has to be virtual, and we may have
// resources to clean up in the future.
}
int InputStream::s_Seek(aws_input_stream *stream, int64_t offset, enum aws_stream_seek_basis basis)
{
auto impl = static_cast<InputStream *>(stream->impl);
// Detect whether implementation raises an error when reporting failure.
// Docs for C++ SeekImpl API say you "SHOULD" raise an error,
// but the C API does in fact require an error to be raised.
aws_reset_error();
if (impl->SeekImpl(offset, static_cast<StreamSeekBasis>(basis)))
{
return AWS_OP_SUCCESS;
}
if (aws_last_error() == 0)
{
aws_raise_error(AWS_IO_STREAM_SEEK_FAILED);
}
return AWS_OP_ERR;
}
int InputStream::s_Read(aws_input_stream *stream, aws_byte_buf *dest)
{
auto impl = static_cast<InputStream *>(stream->impl);
// Detect whether implementation raises an error when reporting failure.
// Docs for C++ ReadImpl API say you "SHOULD" raise an error,
// but the C API does in fact require an error to be raised.
aws_reset_error();
if (impl->ReadImpl(*dest))
{
return AWS_OP_SUCCESS;
}
if (aws_last_error() == 0)
{
aws_raise_error(AWS_IO_STREAM_READ_FAILED);
}
return AWS_OP_ERR;
}
int InputStream::s_GetStatus(aws_input_stream *stream, aws_stream_status *status)
{
auto impl = static_cast<InputStream *>(stream->impl);
*status = impl->GetStatusImpl();
return AWS_OP_SUCCESS;
}
int InputStream::s_GetLength(struct aws_input_stream *stream, int64_t *out_length)
{
auto impl = static_cast<InputStream *>(stream->impl);
int64_t length = impl->GetLengthImpl();
if (length >= 0)
{
*out_length = length;
return AWS_OP_SUCCESS;
}
aws_raise_error(AWS_IO_STREAM_READ_FAILED);
return AWS_OP_ERR;
}
void InputStream::s_Acquire(aws_input_stream *stream)
{
auto impl = static_cast<InputStream *>(stream->impl);
impl->AcquireRef();
}
void InputStream::s_Release(aws_input_stream *stream)
{
auto impl = static_cast<InputStream *>(stream->impl);
impl->ReleaseRef();
}
aws_input_stream_vtable InputStream::s_vtable = {
InputStream::s_Seek,
InputStream::s_Read,
InputStream::s_GetStatus,
InputStream::s_GetLength,
InputStream::s_Acquire,
InputStream::s_Release,
};
InputStream::InputStream(Aws::Crt::Allocator *allocator)
{
m_allocator = allocator;
AWS_ZERO_STRUCT(m_underlying_stream);
m_underlying_stream.impl = this;
m_underlying_stream.vtable = &s_vtable;
}
StdIOStreamInputStream::StdIOStreamInputStream(
std::shared_ptr<Aws::Crt::Io::IStream> stream,
Aws::Crt::Allocator *allocator) noexcept
: InputStream(allocator), m_stream(std::move(stream))
{
}
bool StdIOStreamInputStream::IsValid() const noexcept
{
auto status = GetStatusImpl();
return status.is_valid;
}
bool StdIOStreamInputStream::ReadImpl(ByteBuf &buffer) noexcept
{
// so this blocks, but readsome() doesn't work at all, so this is the best we've got.
// if you don't like this, don't use std::input_stream and implement your own version
// of Aws::Crt::Io::InputStream.
m_stream->read(reinterpret_cast<char *>(buffer.buffer + buffer.len), buffer.capacity - buffer.len);
auto read = m_stream->gcount();
buffer.len += static_cast<size_t>(read);
if (read > 0 || (read == 0 && m_stream->eof()))
{
return true;
}
auto status = GetStatusImpl();
return status.is_valid && !status.is_end_of_stream;
}
StreamStatus StdIOStreamInputStream::GetStatusImpl() const noexcept
{
StreamStatus status;
status.is_end_of_stream = m_stream->eof();
status.is_valid = static_cast<bool>(*m_stream);
return status;
}
int64_t StdIOStreamInputStream::GetLengthImpl() const noexcept
{
auto currentPosition = m_stream->tellg();
m_stream->seekg(0, std::ios_base::end);
int64_t retVal = -1;
if (*m_stream)
{
retVal = static_cast<int64_t>(m_stream->tellg());
}
m_stream->seekg(currentPosition);
return retVal;
}
bool StdIOStreamInputStream::SeekImpl(int64_t offset, StreamSeekBasis seekBasis) noexcept
{
// very important, otherwise the stream can't be reused after reading the entire stream the first time.
m_stream->clear();
auto seekDir = std::ios_base::beg;
switch (seekBasis)
{
case StreamSeekBasis::Begin:
seekDir = std::ios_base::beg;
break;
case StreamSeekBasis::End:
seekDir = std::ios_base::end;
break;
default:
aws_raise_error(AWS_ERROR_INVALID_ARGUMENT);
return false;
}
using stdOffType = Aws::Crt::Io::IStream::off_type;
if (offset < std::numeric_limits<stdOffType>::min() || offset > std::numeric_limits<stdOffType>::max())
{
aws_raise_error(AWS_IO_STREAM_INVALID_SEEK_POSITION);
return false;
}
m_stream->seekg(static_cast<stdOffType>(offset), seekDir);
return true;
}
} // namespace Io
} // namespace Crt
} // namespace Aws
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