internalaprinputbuffer.java

业界著名的tomcat服务器的最新6.0的源代码。

                bbuf.clear();
                int nRead = Socket.recvbbt
                    (socket, 0, buf.length - lastValid, readTimeout);
                if (nRead > 0) {
                    bbuf.limit(nRead);
                    bbuf.get(buf, pos, nRead);
                    lastValid = pos + nRead;
                } else {
                    if ((-nRead) == Status.ETIMEDOUT || (-nRead) == Status.TIMEUP) {
                        return false;
                    } else {
                        throw new IOException(sm.getString("iib.failedread"));
                    }
                }
            }
        }

        //
        // Reading the method name
        // Method name is always US-ASCII
        //

        boolean space = false;

        while (!space) {

            // Read new bytes if needed
            if (pos >= lastValid) {
                if (!fill())
                    throw new EOFException(sm.getString("iib.eof.error"));
            }

            if (buf[pos] == Constants.SP) {
                space = true;
                request.method().setBytes(buf, start, pos - start);
            }

            pos++;

        }

        // Mark the current buffer position
        start = pos;
        int end = 0;
        int questionPos = -1;

        //
        // Reading the URI
        //

        space = false;
        boolean eol = false;

        while (!space) {

            // Read new bytes if needed
            if (pos >= lastValid) {
                if (!fill())
                    throw new EOFException(sm.getString("iib.eof.error"));
            }

            if (buf[pos] == Constants.SP) {
                space = true;
                end = pos;
            } else if ((buf[pos] == Constants.CR) 
                       || (buf[pos] == Constants.LF)) {
                // HTTP/0.9 style request
                eol = true;
                space = true;
                end = pos;
            } else if ((buf[pos] == Constants.QUESTION) 
                       && (questionPos == -1)) {
                questionPos = pos;
            }

            pos++;

        }

        request.unparsedURI().setBytes(buf, start, end - start);
        if (questionPos >= 0) {
            request.queryString().setBytes(buf, questionPos + 1, 
                                           end - questionPos - 1);
            request.requestURI().setBytes(buf, start, questionPos - start);
        } else {
            request.requestURI().setBytes(buf, start, end - start);
        }

        // Mark the current buffer position
        start = pos;
        end = 0;

        //
        // Reading the protocol
        // Protocol is always US-ASCII
        //

        while (!eol) {

            // Read new bytes if needed
            if (pos >= lastValid) {
                if (!fill())
                    throw new EOFException(sm.getString("iib.eof.error"));
            }

            if (buf[pos] == Constants.CR) {
                end = pos;
            } else if (buf[pos] == Constants.LF) {
                if (end == 0)
                    end = pos;
                eol = true;
            }

            pos++;

        }

        if ((end - start) > 0) {
            request.protocol().setBytes(buf, start, end - start);
        } else {
            request.protocol().setString("");
        }
        
        return true;

    }


    /**
     * Parse the HTTP headers.
     */
    public void parseHeaders()
        throws IOException {

        while (parseHeader()) {
        }

        parsingHeader = false;
        end = pos;

    }


    /**
     * Parse an HTTP header.
     * 
     * @return false after reading a blank line (which indicates that the
     * HTTP header parsing is done
     */
    public boolean parseHeader()
        throws IOException {

        //
        // Check for blank line
        //

        byte chr = 0;
        while (true) {

            // Read new bytes if needed
            if (pos >= lastValid) {
                if (!fill())
                    throw new EOFException(sm.getString("iib.eof.error"));
            }

            chr = buf[pos];

            if ((chr == Constants.CR) || (chr == Constants.LF)) {
                if (chr == Constants.LF) {
                    pos++;
                    return false;
                }
            } else {
                break;
            }

            pos++;

        }

        // Mark the current buffer position
        int start = pos;

        //
        // Reading the header name
        // Header name is always US-ASCII
        //

        boolean colon = false;
        MessageBytes headerValue = null;

        while (!colon) {

            // Read new bytes if needed
            if (pos >= lastValid) {
                if (!fill())
                    throw new EOFException(sm.getString("iib.eof.error"));
            }

            if (buf[pos] == Constants.COLON) {
                colon = true;
                headerValue = headers.addValue(buf, start, pos - start);
            }
            chr = buf[pos];
            if ((chr >= Constants.A) && (chr <= Constants.Z)) {
                buf[pos] = (byte) (chr - Constants.LC_OFFSET);
            }

            pos++;

        }

        // Mark the current buffer position
        start = pos;
        int realPos = pos;

        //
        // Reading the header value (which can be spanned over multiple lines)
        //

        boolean eol = false;
        boolean validLine = true;

        while (validLine) {

            boolean space = true;

            // Skipping spaces
            while (space) {

                // Read new bytes if needed
                if (pos >= lastValid) {
                    if (!fill())
                        throw new EOFException(sm.getString("iib.eof.error"));
                }

                if ((buf[pos] == Constants.SP) || (buf[pos] == Constants.HT)) {
                    pos++;
                } else {
                    space = false;
                }

            }

            int lastSignificantChar = realPos;

            // Reading bytes until the end of the line
            while (!eol) {

                // Read new bytes if needed
                if (pos >= lastValid) {
                    if (!fill())
                        throw new EOFException(sm.getString("iib.eof.error"));
                }

                if (buf[pos] == Constants.CR) {
                } else if (buf[pos] == Constants.LF) {
                    eol = true;
                } else if (buf[pos] == Constants.SP) {
                    buf[realPos] = buf[pos];
                    realPos++;
                } else {
                    buf[realPos] = buf[pos];
                    realPos++;
                    lastSignificantChar = realPos;
                }

                pos++;

            }

            realPos = lastSignificantChar;

            // Checking the first character of the new line. If the character
            // is a LWS, then it's a multiline header

            // Read new bytes if needed
            if (pos >= lastValid) {
                if (!fill())
                    throw new EOFException(sm.getString("iib.eof.error"));
            }

            chr = buf[pos];
            if ((chr != Constants.SP) && (chr != Constants.HT)) {
                validLine = false;
            } else {
                eol = false;
                // Copying one extra space in the buffer (since there must
                // be at least one space inserted between the lines)
                buf[realPos] = chr;
                realPos++;
            }

        }

        // Set the header value
        headerValue.setBytes(buf, start, realPos - start);

        return true;

    }


    // ---------------------------------------------------- InputBuffer Methods


    /**
     * Read some bytes.
     */
    public int doRead(ByteChunk chunk, Request req) 
        throws IOException {

        if (lastActiveFilter == -1)
            return inputStreamInputBuffer.doRead(chunk, req);
        else
            return activeFilters[lastActiveFilter].doRead(chunk,req);

    }


    // ------------------------------------------------------ Protected Methods


    /**
     * Fill the internal buffer using data from the undelying input stream.
     * 
     * @return false if at end of stream
     */
    protected boolean fill()
        throws IOException {

        int nRead = 0;

        if (parsingHeader) {

            if (lastValid == buf.length) {
                throw new IOException
                    (sm.getString("iib.requestheadertoolarge.error"));
            }

            bbuf.clear();
            nRead = Socket.recvbb(socket, 0, buf.length - lastValid);
            if (nRead > 0) {
                bbuf.limit(nRead);
                bbuf.get(buf, pos, nRead);
                lastValid = pos + nRead;
            } else {
                if ((-nRead) == Status.EAGAIN) {
                    return false;
                } else {
                    throw new IOException(sm.getString("iib.failedread"));
                }
            }

        } else {

            if (buf.length - end < 4500) {
                // In this case, the request header was really large, so we allocate a 
                // brand new one; the old one will get GCed when subsequent requests
                // clear all references
                buf = new byte[buf.length];
                end = 0;
            }
            pos = end;
            lastValid = pos;
            bbuf.clear();
            nRead = Socket.recvbb(socket, 0, buf.length - lastValid);
            if (nRead > 0) {
                bbuf.limit(nRead);
                bbuf.get(buf, pos, nRead);
                lastValid = pos + nRead;
            } else {
                if ((-nRead) == Status.ETIMEDOUT || (-nRead) == Status.TIMEUP) {
                    throw new SocketTimeoutException(sm.getString("iib.failedread"));
                } else {
                    throw new IOException(sm.getString("iib.failedread"));
                }
            }

        }

        return (nRead > 0);

    }


    // ------------------------------------- InputStreamInputBuffer Inner Class


    /**
     * This class is an input buffer which will read its data from an input
     * stream.
     */
    protected class SocketInputBuffer 
        implements InputBuffer {


        /**
         * Read bytes into the specified chunk.
         */
        public int doRead(ByteChunk chunk, Request req ) 
            throws IOException {

            if (pos >= lastValid) {
                if (!fill())
                    return -1;
            }

            int length = lastValid - pos;
            chunk.setBytes(buf, pos, length);
            pos = lastValid;

            return (length);

        }


    }


}