fop-core/src/main/java/org/apache/fop/render/pcl/fonts/truetype/PCLTTFFontReader.java [674:695]:
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    protected static int getCheckSum(byte[] data, int start, int size) {
        // All the tables here are aligned on four byte boundaries
        // Add remainder to size if it's not a multiple of 4
        int remainder = size % 4;
        if (remainder != 0) {
            size += remainder;
        }

        long sum = 0;

        for (int i = 0; i < size; i += 4) {
            long l = 0;
            for (int j = 0; j < 4; j++) {
                l <<= 8;
                if (data.length > (start + i + j)) {
                    l |= data[start + i + j] & 0xff;
                }
            }
            sum += l;
        }
        return (int) sum;
    }
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fop-core/src/main/java/org/apache/fop/fonts/truetype/TTFSubSetFile.java [686:707]:
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    protected static int getCheckSum(byte[] data, int start, int size) {
        // All the tables here are aligned on four byte boundaries
        // Add remainder to size if it's not a multiple of 4
        int remainder = size % 4;
        if (remainder != 0) {
            size += remainder;
        }

        long sum = 0;

        for (int i = 0; i < size; i += 4) {
            long l = 0;
            for (int j = 0; j < 4; j++) {
                l <<= 8;
                if (data.length > (start + i + j)) {
                    l |= data[start + i + j] & 0xff;
                }
            }
            sum += l;
        }
        return (int) sum;
    }
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