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/*
** Copyright (c) 2018-2020 Valve Corporation
** Copyright (c) 2018-2020 LunarG, Inc.
**
** Permission is hereby granted, free of charge, to any person obtaining a
** copy of this software and associated documentation files (the "Software"),
** to deal in the Software without restriction, including without limitation
** the rights to use, copy, modify, merge, publish, distribute, sublicense,
** and/or sell copies of the Software, and to permit persons to whom the
** Software is furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in
** all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
** FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
** DEALINGS IN THE SOFTWARE.
*/
#ifndef GFXRECON_DECODE_STRING_DECODER_H
#define GFXRECON_DECODE_STRING_DECODER_H
#include "decode/pointer_decoder_base.h"
#include "decode/decode_allocator.h"
#include "decode/value_decoder.h"
#include "format/format.h"
#include "util/defines.h"
#include <cassert>
#include <cwchar>
GFXRECON_BEGIN_NAMESPACE(gfxrecon)
GFXRECON_BEGIN_NAMESPACE(decode)
template <typename CharT, typename EncodeT, format::PointerAttributes DecodeAttrib>
class BasicStringDecoder : public PointerDecoderBase
{
public:
BasicStringDecoder() : data_(nullptr), capacity_(0), is_memory_external_(false) {}
const CharT* GetPointer() const { return data_; }
void SetExternalMemory(CharT* data, size_t capacity)
{
if ((data != nullptr) && (capacity > 0))
{
data_ = data;
capacity_ = capacity;
is_memory_external_ = true;
}
else
{
GFXRECON_LOG_WARNING("String decoder's external memory was initialized with a NULL pointer");
}
}
size_t Decode(const uint8_t* buffer, size_t buffer_size)
{
size_t bytes_read = DecodeAttributes(buffer, buffer_size);
// We should only be decoding individual strings.
assert((GetAttributeMask() & DecodeAttrib) == DecodeAttrib);
assert((GetAttributeMask() & format::PointerAttributes::kIsArray) != format::PointerAttributes::kIsArray);
if (!IsNull() && HasData())
{
size_t string_len = GetLength();
size_t alloc_len = string_len + 1;
if (!is_memory_external_)
{
assert(data_ == nullptr);
data_ = DecodeAllocator::Allocate<CharT>(alloc_len, false);
capacity_ = alloc_len;
bytes_read += ValueDecoder::DecodeArrayFrom<EncodeT>(
(buffer + bytes_read), (buffer_size - bytes_read), data_, string_len);
data_[string_len] = '\0';
}
else
{
assert(data_ != nullptr);
if (alloc_len <= capacity_)
{
ValueDecoder::DecodeArrayFrom<EncodeT>(
(buffer + bytes_read), (buffer_size - bytes_read), data_, string_len);
data_[string_len] = '\0';
}
else
{
size_t truncate_len = capacity_ - 1;
ValueDecoder::DecodeArrayFrom<EncodeT>(
(buffer + bytes_read), (buffer_size - bytes_read), data_, truncate_len);
data_[truncate_len] = '\0';
GFXRECON_LOG_WARNING("String decoder's external memory capacity (%" PRIuPTR
") is smaller than the decoded string size (%" PRIuPTR
"); data will be truncated",
capacity_,
alloc_len);
}
// We always need to advance the position within the buffer by the amount of data that was expected to
// be decoded, not the actual amount of data decoded if capacity is too small to hold all of the data.
bytes_read += string_len * sizeof(EncodeT);
}
}
return bytes_read;
}
private:
CharT* data_;
size_t capacity_;
bool is_memory_external_;
};
typedef BasicStringDecoder<char, format::CharEncodeType, format::PointerAttributes::kIsString> StringDecoder;
typedef BasicStringDecoder<wchar_t, format::WCharEncodeType, format::PointerAttributes::kIsWString> WStringDecoder;
GFXRECON_END_NAMESPACE(decode)
GFXRECON_END_NAMESPACE(gfxrecon)
#endif // GFXRECON_DECODE_STRING_DECODER_H
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