| // Copyright 2018 The Fuchsia Authors |
| // |
| // Use of this source code is governed by a MIT-style |
| // license that can be found in the LICENSE file or at |
| // https://opensource.org/licenses/MIT |
| |
| #include <object/buffer_chain.h> |
| |
| // Makes a const void* look like a user_in_ptr<const void>. |
| // |
| // Sometimes we need to copy data from kernel space. KernelPtrAdapter allows us to implement the |
| // copy logic once for both const void* and user_in_ptr<const void>. |
| class KernelPtrAdapter { |
| public: |
| explicit KernelPtrAdapter(const void* p) |
| : p_(p) {} |
| zx_status_t copy_array_from_user(void* dst, size_t count) const { |
| memcpy(dst, p_, count); |
| return ZX_OK; |
| } |
| KernelPtrAdapter byte_offset(size_t offset) const { |
| return KernelPtrAdapter(reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(p_) + offset)); |
| } |
| |
| private: |
| const void* p_; |
| }; |
| |
| zx_status_t BufferChain::CopyInKernel(const void* src, size_t dst_offset, size_t size) { |
| return CopyInCommon(KernelPtrAdapter(src), dst_offset, size); |
| } |
| |
| template zx_status_t BufferChain::CopyInCommon(user_in_ptr<const void> src, size_t dst_offset, |
| size_t size); |