proton-j/src/main/java/org/apache/qpid/proton/codec/messaging/FastPathHeaderType.java [141:191]:
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    public void write(Header value) {
        WritableBuffer buffer = getEncoder().getBuffer();
        int count = getElementCount(value);
        byte encodingCode = deduceEncodingCode(value, count);

        buffer.put(EncodingCodes.DESCRIBED_TYPE_INDICATOR);
        buffer.put(EncodingCodes.SMALLULONG);
        buffer.put(DESCRIPTOR_CODE);
        buffer.put(encodingCode);

        // Optimized step, no other data to be written.
        if (encodingCode == EncodingCodes.LIST0) {
            return;
        }

        final int fieldWidth;

        if (encodingCode == EncodingCodes.LIST8) {
            fieldWidth = 1;
        } else {
            fieldWidth = 4;
        }

        int startIndex = buffer.position();

        // Reserve space for the size and write the count of list elements.
        if (fieldWidth == 1) {
            buffer.put((byte) 0);
            buffer.put((byte) count);
        } else {
            buffer.putInt(0);
            buffer.putInt(count);
        }

        // Write the list elements and then compute total size written.
        for (int i = 0; i < count; ++i) {
            writeElement(value, i);
        }

        // Move back and write the size
        int endIndex = buffer.position();
        int writeSize = endIndex - startIndex - fieldWidth;

        buffer.position(startIndex);
        if (fieldWidth == 1) {
            buffer.put((byte) writeSize);
        } else {
            buffer.putInt(writeSize);
        }
        buffer.position(endIndex);
    }
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proton-j/src/main/java/org/apache/qpid/proton/codec/messaging/FastPathPropertiesType.java [165:215]:
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    public void write(Properties value) {
        WritableBuffer buffer = getEncoder().getBuffer();
        int count = getElementCount(value);
        byte encodingCode = deduceEncodingCode(value, count);

        buffer.put(EncodingCodes.DESCRIBED_TYPE_INDICATOR);
        buffer.put(EncodingCodes.SMALLULONG);
        buffer.put(DESCRIPTOR_CODE);
        buffer.put(encodingCode);

        // Optimized step, no other data to be written.
        if (encodingCode == EncodingCodes.LIST0) {
            return;
        }

        final int fieldWidth;

        if (encodingCode == EncodingCodes.LIST8) {
            fieldWidth = 1;
        } else {
            fieldWidth = 4;
        }

        int startIndex = buffer.position();

        // Reserve space for the size and write the count of list elements.
        if (fieldWidth == 1) {
            buffer.put((byte) 0);
            buffer.put((byte) count);
        } else {
            buffer.putInt(0);
            buffer.putInt(count);
        }

        // Write the list elements and then compute total size written.
        for (int i = 0; i < count; ++i) {
            writeElement(value, i);
        }

        // Move back and write the size
        int endIndex = buffer.position();
        int writeSize = endIndex - startIndex - fieldWidth;

        buffer.position(startIndex);
        if (fieldWidth == 1) {
            buffer.put((byte) writeSize);
        } else {
            buffer.putInt(writeSize);
        }
        buffer.position(endIndex);
    }
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