utf8BytesNonAscii() — netty Function Reference

Architecture documentation for the utf8BytesNonAscii() function in ByteBufUtil.java from the netty codebase.

Function java Buffer Telemetry called by 1

Entity Profile

Buffer→ Telemetry→ utf8BytesNonAscii() — netty Function Reference

Dependency Diagram

graph TD
  0da47e3d_b4bd_90e4_3000_aca6d4e3cd1d["utf8BytesNonAscii()"]
  920454f6_25f6_4a9b_3d32_9684c3e11f6c["ByteBufUtil"]
  0da47e3d_b4bd_90e4_3000_aca6d4e3cd1d -->|defined in| 920454f6_25f6_4a9b_3d32_9684c3e11f6c
  e5a26d38_968d_e748_84db_676493308e82["utf8ByteCount()"]
  e5a26d38_968d_e748_84db_676493308e82 -->|calls| 0da47e3d_b4bd_90e4_3000_aca6d4e3cd1d
  style 0da47e3d_b4bd_90e4_3000_aca6d4e3cd1d fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

buffer/src/main/java/io/netty/buffer/ByteBufUtil.java lines 1192–1224

    private static int utf8BytesNonAscii(final CharSequence seq, final int start, final int end) {
        int encodedLength = 0;
        for (int i = start; i < end; i++) {
            final char c = seq.charAt(i);
            // making it 100% branchless isn't rewarding due to the many bit operations necessary!
            if (c < 0x800) {
                // branchless version of: (c <= 127 ? 0:1) + 1
                encodedLength += ((0x7f - c) >>> 31) + 1;
            } else if (isSurrogate(c)) {
                if (!Character.isHighSurrogate(c)) {
                    encodedLength++;
                    // WRITE_UTF_UNKNOWN
                    continue;
                }
                // Surrogate Pair consumes 2 characters.
                if (++i == end) {
                    encodedLength++;
                    // WRITE_UTF_UNKNOWN
                    break;
                }
                if (!Character.isLowSurrogate(seq.charAt(i))) {
                    // WRITE_UTF_UNKNOWN + (Character.isHighSurrogate(c2) ? WRITE_UTF_UNKNOWN : c2)
                    encodedLength += 2;
                    continue;
                }
                // See https://www.unicode.org/versions/Unicode7.0.0/ch03.pdf#G2630.
                encodedLength += 4;
            } else {
                encodedLength += 3;
            }
        }
        return encodedLength;
    }