117 lines
2.4 KiB
C++
117 lines
2.4 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#include "ByteReverse.hxx"
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#include "util/ByteOrder.hxx"
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#include "Compiler.h"
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#include <cassert>
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void
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reverse_bytes_16(uint16_t *gcc_restrict dest,
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const uint16_t *gcc_restrict src,
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const uint16_t *src_end) noexcept
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{
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assert(dest != nullptr);
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assert(src != nullptr);
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assert(src_end >= src);
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while (src < src_end) {
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const uint16_t x = *src++;
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*dest++ = ByteSwap16(x);
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}
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}
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void
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reverse_bytes_32(uint32_t *gcc_restrict dest,
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const uint32_t *gcc_restrict src,
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const uint32_t *src_end) noexcept
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{
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assert(dest != nullptr);
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assert(src != nullptr);
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assert(src_end >= src);
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while (src < src_end) {
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const uint32_t x = *src++;
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*dest++ = ByteSwap32(x);
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}
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}
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void
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reverse_bytes_64(uint64_t *gcc_restrict dest,
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const uint64_t *gcc_restrict src,
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const uint64_t *src_end) noexcept
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{
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assert(dest != nullptr);
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assert(src != nullptr);
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assert(src_end >= src);
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while (src < src_end) {
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const uint64_t x = *src++;
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*dest++ = ByteSwap64(x);
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}
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}
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static void
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reverse_bytes_linear(uint8_t *gcc_restrict dest,
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const uint8_t *gcc_restrict src, size_t n) noexcept
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{
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src += n;
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while (n-- > 0)
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*dest++ = *--src;
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}
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static void
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reverse_bytes_generic(uint8_t *gcc_restrict dest,
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const uint8_t *gcc_restrict src, const uint8_t *src_end,
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size_t frame_size) noexcept
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{
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assert(dest != nullptr);
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assert(src != nullptr);
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assert(src_end >= src);
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assert(frame_size > 0);
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assert((src_end - src) % frame_size == 0);
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while (src < src_end) {
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reverse_bytes_linear(dest, src, frame_size);
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dest += frame_size;
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src += frame_size;
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}
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}
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void
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reverse_bytes(uint8_t *gcc_restrict dest,
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const uint8_t *gcc_restrict src, const uint8_t *src_end,
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size_t frame_size) noexcept
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{
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assert(dest != nullptr);
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assert(src != nullptr);
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assert(src_end >= src);
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assert(frame_size > 0);
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assert((src_end - src) % frame_size == 0);
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switch (frame_size) {
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case 2:
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reverse_bytes_16((uint16_t *)dest,
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(const uint16_t *)src,
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(const uint16_t *)src_end);
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break;
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case 4:
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reverse_bytes_32((uint32_t *)dest,
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(const uint32_t *)src,
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(const uint32_t *)src_end);
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break;
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case 8:
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reverse_bytes_64((uint64_t *)dest,
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(const uint64_t *)src,
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(const uint64_t *)src_end);
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break;
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default:
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reverse_bytes_generic(dest, src, src_end, frame_size);
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}
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}
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