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hle_ipc: Add ReadBufferSpan function

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Returns a std::span to the buffer address, rather than create a copy of the memory into a std::vector
This commit is contained in:
ameerj 2022-12-25 13:20:59 -05:00
parent 9933121256
commit 9349f06963
2 changed files with 22 additions and 0 deletions
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19
src/core/hle/kernel/hle_ipc.cpp
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@ -345,6 +345,25 @@ std::vector<u8> HLERequestContext::ReadBuffer(std::size_t buffer_index) const {
}
}
std::span<const u8> HLERequestContext::ReadBufferSpan(std::size_t buffer_index) const {
LOG_CRITICAL(Debug, "called");
const bool is_buffer_a{BufferDescriptorA().size() > buffer_index &&
BufferDescriptorA()[buffer_index].Size()};
if (is_buffer_a) {
ASSERT_OR_EXECUTE_MSG(
BufferDescriptorA().size() > buffer_index, { return {}; },
"BufferDescriptorA invalid buffer_index {}", buffer_index);
const u8* const mem_ptr = memory.GetPointer(BufferDescriptorA()[buffer_index].Address());
return std::span<const u8>(mem_ptr, BufferDescriptorA()[buffer_index].Size());
} else {
ASSERT_OR_EXECUTE_MSG(
BufferDescriptorX().size() > buffer_index, { return {}; },
"BufferDescriptorX invalid buffer_index {}", buffer_index);
const u8* const mem_ptr = memory.GetPointer(BufferDescriptorX()[buffer_index].Address());
return std::span<const u8>(mem_ptr, BufferDescriptorX()[buffer_index].Size());
}
}
std::size_t HLERequestContext::WriteBuffer(const void* buffer, std::size_t size,
std::size_t buffer_index) const {
if (size == 0) {

3
src/core/hle/kernel/hle_ipc.h
View file

@ -7,6 +7,7 @@
#include <functional>
#include <memory>
#include <optional>
#include <span>
#include <string>
#include <type_traits>
#include <vector>
@ -273,6 +274,8 @@ public:
/// Helper function to read a buffer using the appropriate buffer descriptor
[[nodiscard]] std::vector<u8> ReadBuffer(std::size_t buffer_index = 0) const;
[[nodiscard]] std::span<const u8> ReadBufferSpan(std::size_t buffer_index = 0) const;
/// Helper function to write a buffer using the appropriate buffer descriptor
std::size_t WriteBuffer(const void* buffer, std::size_t size,
std::size_t buffer_index = 0) const;