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137 lines
3.7 KiB
C++
137 lines
3.7 KiB
C++
#include <Poco/UTF8Encoding.h>
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#include <IO/WriteBufferValidUTF8.h>
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#include <Core/Types.h>
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#if __SSE2__
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#include <emmintrin.h>
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#endif
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namespace DB
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{
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const size_t WriteBufferValidUTF8::DEFAULT_SIZE = 4096;
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namespace
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{
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/** Index into the table below with the first byte of a UTF-8 sequence to
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* get the number of trailing bytes that are supposed to follow it.
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* Note that *legal* UTF-8 values can't have 4 or 5-bytes. The table is
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* left as-is for anyone who may want to do such conversion, which was
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* allowed in earlier algorithms.
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*/
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const UInt8 length_of_utf8_sequence[256] =
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{
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, 4,4,4,4,4,4,4,4,5,5,5,5,6,6,6,6
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};
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}
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WriteBufferValidUTF8::WriteBufferValidUTF8(
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WriteBuffer & output_buffer, bool group_replacements, const char * replacement, size_t size)
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: BufferWithOwnMemory<WriteBuffer>(std::max(static_cast<size_t>(32), size)), output_buffer(output_buffer),
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group_replacements(group_replacements), replacement(replacement)
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{
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}
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inline void WriteBufferValidUTF8::putReplacement()
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{
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if (replacement.empty() || (group_replacements && just_put_replacement))
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return;
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just_put_replacement = true;
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output_buffer.write(replacement.data(), replacement.size());
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}
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inline void WriteBufferValidUTF8::putValid(char *data, size_t len)
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{
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if (len == 0)
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return;
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just_put_replacement = false;
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output_buffer.write(data, len);
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}
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void WriteBufferValidUTF8::nextImpl()
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{
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char * p = memory.data();
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char * valid_start = p;
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while (p < pos)
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{
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#if __SSE2__
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/// Fast skip of ASCII
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static constexpr size_t SIMD_BYTES = 16;
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const char * simd_end = p + (pos - p) / SIMD_BYTES * SIMD_BYTES;
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while (p < simd_end && !_mm_movemask_epi8(_mm_loadu_si128(reinterpret_cast<const __m128i*>(p))))
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p += SIMD_BYTES;
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if (!(p < pos))
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break;
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#endif
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size_t len = length_of_utf8_sequence[static_cast<unsigned char>(*p)];
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if (len > 4)
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{
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/// Invalid start of sequence. Skip one byte.
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putValid(valid_start, p - valid_start);
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putReplacement();
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++p;
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valid_start = p;
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}
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else if (p + len > pos)
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{
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/// Sequence was not fully written to this buffer.
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break;
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}
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else if (Poco::UTF8Encoding::isLegal(reinterpret_cast<unsigned char *>(p), len))
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{
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/// Valid sequence.
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p += len;
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}
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else
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{
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/// Invalid sequence. Skip just first byte.
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putValid(valid_start, p - valid_start);
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putReplacement();
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++p;
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valid_start = p;
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}
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}
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putValid(valid_start, p - valid_start);
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size_t cnt = pos - p;
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/// Shift unfinished sequence to start of buffer.
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for (size_t i = 0; i < cnt; ++i)
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memory[i] = p[i];
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working_buffer = Buffer(&memory[cnt], memory.data() + memory.size());
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}
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void WriteBufferValidUTF8::finish()
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{
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/// Write all complete sequences from buffer.
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nextImpl();
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/// If unfinished sequence at end, then write replacement.
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if (working_buffer.begin() != memory.data())
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putReplacement();
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}
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}
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