protected COSString parseCOSString()

in pdfbox/src/main/java/org/apache/pdfbox/pdfparser/BaseParser.java [497:648]
141 lines of code
37 McCabe index (conditional complexity)

    protected COSString parseCOSString() throws IOException
    {
        char nextChar = (char) source.read();
        if (nextChar == '<')
        {
            return parseCOSHexString();
        }
        else if (nextChar != '(')
        {
            throw new IOException( "parseCOSString string should start with '(' or '<' and not '" +
                    nextChar + "' at offset " + source.getPosition());
        }
        
        ByteArrayOutputStream out = new ByteArrayOutputStream();

        // This is the number of braces read
        int braces = 1;
        int c = source.read();
        while( braces > 0 && c != -1)
        {
            char ch = (char)c;
            int nextc = -2; // not yet read

            if (ch == ')')
            {

                braces--;
                braces = checkForEndOfString(braces);
                if( braces != 0 )
                {
                    out.write(ch);
                }
            }
            else if (ch == '(')
            {
                braces++;
                out.write(ch);
            }
            else if( ch == '\\' )
            {
                //patched by ram
                char next = (char) source.read();
                switch(next)
                {
                    case 'n':
                        out.write('\n');
                        break;
                    case 'r':
                        out.write('\r');
                        break;
                    case 't':
                        out.write('\t');
                        break;
                    case 'b':
                        out.write('\b');
                        break;
                    case 'f':
                        out.write('\f');
                        break;
                    case ')':
                        // PDFBox 276 /Title (c:\)
                    braces = checkForEndOfString(braces);
                        if( braces != 0 )
                        {
                            out.write(next);
                        }
                        else
                        {
                            out.write('\\');
                        }
                        break;
                    case '(':
                    case '\\':
                        out.write(next);
                        break;
                    case ASCII_LF:
                    case ASCII_CR:
                        //this is a break in the line so ignore it and the newline and continue
                        c = source.read();
                        while( isEOL(c) && c != -1)
                        {
                            c = source.read();
                        }
                        nextc = c;
                        break;
                    case '0':
                    case '1':
                    case '2':
                    case '3':
                    case '4':
                    case '5':
                    case '6':
                    case '7':
                        StringBuilder octal = new StringBuilder();
                        octal.append( next );
                        c = source.read();
                        char digit = (char)c;
                        if( digit >= '0' && digit <= '7' )
                        {
                            octal.append( digit );
                            c = source.read();
                            digit = (char)c;
                            if( digit >= '0' && digit <= '7' )
                            {
                                octal.append( digit );
                            }
                            else
                            {
                                nextc = c;
                            }
                        }
                        else
                        {
                            nextc = c;
                        }
    
                        int character = 0;
                        try
                        {
                            character = Integer.parseInt( octal.toString(), 8 );
                        }
                        catch( NumberFormatException e )
                        {
                            throw new IOException( "Error: Expected octal character, actual='" + octal + "'", e );
                        }
                        out.write(character);
                        break;
                    default:
                        // dropping the backslash
                        // see 7.3.4.2 Literal Strings for further information
                        out.write(next);
                }
            }
            else
            {
                out.write(ch);
            }
            if (nextc != -2)
            {
                c = nextc;
            }
            else
            {
                c = source.read();
            }
        }
        if (c != -1)
        {
            source.rewind(1);
        }
        return new COSString(out.toByteArray());
    }