mirror of
https://github.com/AssetRipper/dxil-spirv.git
synced 2026-11-13 20:05:46 -10:00
134 lines
3.2 KiB
C++
134 lines
3.2 KiB
C++
/* Copyright (c) 2019-2022 Hans-Kristian Arntzen for Valve Corporation
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "memory_stream.hpp"
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#include <string.h>
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namespace dxil_spv
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{
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MemoryStream::MemoryStream(const void *blob_, size_t size)
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: blob(static_cast<const uint8_t *>(blob_))
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, blob_size(size)
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{
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}
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void MemoryStream::reset()
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{
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blob_offset = 0;
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}
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bool MemoryStream::read(void *buffer, size_t size)
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{
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if (blob_offset + size > blob_size)
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return false;
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memcpy(buffer, blob + blob_offset, size);
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blob_offset += size;
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return true;
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}
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const void *MemoryStream::map_read(size_t size)
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{
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if (blob_offset + size > blob_size)
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return nullptr;
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const void *mapped = blob + blob_offset;
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blob_offset += size;
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return mapped;
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}
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bool MemoryStream::map_string_iterate(const char *&str)
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{
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// Strings are C strings and can be mapped 1:1.
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// Just need to verify they terminate properly.
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str = reinterpret_cast<const char *>(blob + blob_offset);
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char c;
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do
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{
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if (!read(c))
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return false;
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else if (c == '\0')
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break;
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} while (c != '\0');
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return true;
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}
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bool MemoryStream::map_string_absolute(const char *&str, size_t offset) const
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{
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auto substream = create_substream(offset);
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return substream.map_string_iterate(str);
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}
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bool MemoryStream::seek(size_t new_offset)
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{
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if (new_offset > blob_size)
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return false;
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blob_offset = new_offset;
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return true;
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}
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bool MemoryStream::skip(size_t count)
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{
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return seek(blob_offset + count);
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}
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MemoryStream MemoryStream::create_substream(size_t offset, size_t size) const
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{
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if (offset >= blob_size || offset + size > blob_size)
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return { nullptr, 0 };
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else
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return { blob + offset, size };
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}
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MemoryStream MemoryStream::create_substream(size_t offset) const
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{
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if (offset >= blob_size)
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return { nullptr, 0 };
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else
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return { blob + offset, blob_size - offset };
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}
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MemoryStream MemoryStream::create_substream_bitcode_size(size_t offset, size_t bitcode_size) const
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{
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if (offset + bitcode_size > blob_size)
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return { nullptr, 0 };
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else
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return { blob + offset, bitcode_size };
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}
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size_t MemoryStream::get_offset() const
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{
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return blob_offset;
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}
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size_t MemoryStream::get_size() const
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{
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return blob_size;
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}
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} // namespace dxil_spv
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