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SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/UserOrKernelBuffer.h>
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#include <Kernel/VM/MemoryManager.h>
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namespace Kernel {
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bool UserOrKernelBuffer::is_kernel_buffer() const
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{
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return !is_user_address(VirtualAddress(m_buffer));
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}
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String UserOrKernelBuffer::copy_into_string(size_t size) const
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{
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if (!m_buffer)
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return {};
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if (is_user_address(VirtualAddress(m_buffer))) {
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char* buffer;
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auto data_copy = StringImpl::create_uninitialized(size, buffer);
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if (!copy_from_user(buffer, m_buffer, size))
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return {};
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return data_copy;
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}
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return String(ReadonlyBytes { m_buffer, size });
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}
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bool UserOrKernelBuffer::write(const void* src, size_t offset, size_t len)
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{
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if (!m_buffer)
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return false;
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if (is_user_address(VirtualAddress(m_buffer)))
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return copy_to_user(m_buffer + offset, src, len);
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memcpy(m_buffer + offset, src, len);
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return true;
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}
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bool UserOrKernelBuffer::read(void* dest, size_t offset, size_t len) const
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{
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if (!m_buffer)
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return false;
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if (is_user_address(VirtualAddress(m_buffer)))
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return copy_from_user(dest, m_buffer + offset, len);
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memcpy(dest, m_buffer + offset, len);
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return true;
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}
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bool UserOrKernelBuffer::memset(int value, size_t offset, size_t len)
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{
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if (!m_buffer)
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return false;
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if (is_user_address(VirtualAddress(m_buffer)))
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return memset_user(m_buffer + offset, value, len);
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::memset(m_buffer + offset, value, len);
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return true;
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}
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}
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