31 results about "Rewrite engine" patented technology

A method and system for cleansing anomalies from sequence-based data at query time. Sequence-based data such as RFID data is loaded into a database. One or more cleansing rules are received at a cleansing rules engine. The cleansing rule engine converts the cleansing rule(s) to a template that includes logic to compensate for anomalies in the sequence-based data. A query to retrieve the sequence-based data is received by a query rewrite engine. The query rewrite engine rewrites the query by applying the template logic. The rewritten query is executed at query time. The result of the rewritten query execution is identical to the result of executing the original query on a data set generated by applying the cleansing rule to all of the sequence-based data.

Embodiments of the apparatus for modifying packet headers relate to a rewrite engine that represents each protocol header of packets in a generic format specific to that protocol to enable programmable modifications of packets, resulting in hardware and software flexibility in modifying packet headers. Software programs generic formats in a hardware table for various protocols. The rewrite engine is able to detect missing fields from a protocol header and is able to expand the protocol header to a maximum size such that the protocol header contains all possible fields of that protocol. Each of the fields has the same offset irrespective of which variation of the protocol the protocol header corresponds to. In a bit vector, all newly added fields are marked invalid (represented by 0), and all existing fields are marked valid (represented by 1). Software modification commands allow data to be replaced, removed and inserted.

Embodiments of the apparatus for modifying packet headers relate to pointer structure for splitting a packet into individual layers and for intelligently stitching them back together. The pointer structure includes N+1 layer pointers to N+1 protocol headers. The pointer structure also includes a total size of all headers. A rewrite engine uses the layer pointers to extract the first N corresponding protocol layers within the packet for modification. The rewrite engine uses the layer pointers to form an end point, which together with the total size of all headers is associated with a body of the headers. The body of the headers is a portion of headers that are not modified by the rewrite engine. After all the modifications are performed and modified headers are compressed, the modified layer pointers are used to stitch the modified headers back together with the body of the headers.

Embodiments of the apparatus for modifying packet headers relate to a packet generalization scheme that maintains information across protocol layers of packets. The packet generalization scheme uses a protocol table that includes layer information for all possible protocol layer combinations. The protocol layer combinations in the protocol table are manually configured through software. Each protocol layer combination in the protocol table is uniquely identified by a PktID. A rewrite engine of a network device receives the PktID for a packet and uses that unique identifier as key to the protocol table to access information for each protocol layer of the packet that the rewrite engine requires during modification of the packet. The packet generalization scheme eliminates the need for a parser engine of the network device to pass parsed data to the rewrite engine, which is resource intensive.

The invention discloses a jump processing method for two-dimensional bar codes. The jump processing method includes steps of generating the two-dimensional bar codes, setting a website of a jump system and acquiring code numbers according to code number generating rules, and connecting each code number to the rear of the website of the jump system to acquire a complete reference address; using the reference addresses as contents of the two-dimensional bar codes to generate the two-dimensional bar codes, and adding real URL (uniform resource locator) addresses corresponding to the two-dimensional bar codes into a database of the jump system; enabling clients to scan the two-dimensional bar codes by the aid of conventional two-dimensional bar code scanning software such as WeChat and Snapshot to acquire the reference addresses, and calling a default browser of the system to access the website; rewriting and recognizing URLs after a server receives requests and acquiring the code numbers according to URL rewriting rules; enabling a server page to perform matching on the database according to the code numbers in acquired request parameters to acquire the real URL addresses and guiding the clients to real websites. The code numbers are in one-to-one correspondence to the URL addresses.

The invention discloses a method for rewriting the bottom layer of a UE4 rendering engine and a communication mechanism thereof, belonging to the field of software. The rewriting method comprises: rewriting the mechanism of switching the display depth of the bottom layer of the UE4 engine, rewriting the mechanism of the bottom layer of the UE4 engine processing windows messages, Rewrite the underlying keyboard and mouse response events of the UE4 engine, rewrite the underlying mechanism of the UE4 engine to interact with other windows applications, rewrite the underlying window movement and scaling mechanism of the UE4 engine, rewrite the mechanism of the interaction between the UE4 engine and H5 applications, rewrite The timing trigger function at the bottom of the UE engine. By adopting the rewriting method of the above scheme, the development work can be facilitated without reducing the display effect, and the user experience can also be significantly improved. The invention also discloses a method for displaying a UE project in QT and a UE project. By rewriting the underlying mechanism of the UE4 engine, the UE4 rendering window can be embedded in QT to run and display, and the running frame rate and rendering effect are comparable to the UE client. .

Embodiments of the apparatus for modifying packet headers relate to a use of bit vectors to allow expansion and collapse of protocol headers within packets for enabling flexible modification. A rewrite engine expands each protocol header into a generic format and applies various commands to modify the generalized protocol header. The rewrite engine maintains a bit vector for the generalized protocol header with each bit in the bit vector representing a byte of the generalized protocol header. A bit marked as 0 in the bit vector corresponds to an invalid byte, while a bit marked as 1 in the bit vector corresponds to a valid byte. The rewrite engine uses the bit vector to remove all the invalid bytes after all commands have been operated on the generalized protocol header to thereby form a new protocol header.

A two-dimensional bar code electronic station board implementing method includes the steps: 1, generating a two-dimensional bar code of an electronic station board; 2, making the generated two-dimensional bar code into a two-dimensional bar code electronic station board by combining related information of a station; 3, allowing a cell phone client to scan the two-dimensional bar code of the electronic station board through conventional two-dimensional bar code canning software such as WeChat and Quickpai to obtain a referring address, and invoking a system default browser to access to the web address; 4, after a server receives a request, performing URL (universal serial bus) rewriting and recognition to obtain a real URL address, and leading to a real station board web address corresponding to a bus WAP (wireless application protocol) information query platform; 5, displaying information data such as all arrival information and current positions of passing routes on the station through the bus WAP information query platform.

Embodiments of the apparatus for modifying packet headers relate to a rewrite engine that represents each protocol header of packets in a generic format specific to that protocol to enable programmable modifications of packets, resulting in hardware and software flexibility in modifying packet headers. Software programs generic formats in a hardware table for various protocols. The rewrite engine is able to detect missing fields from a protocol header and is able to expand the protocol header to a maximum size such that the protocol header contains all possible fields of that protocol. Each of the fields has the same offset irrespective of which variation of the protocol the protocol header corresponds to. The expanded protocol header is represented by a data structure that is independent of a size of the protocol header.

The invention provides a configurable caching system and method. The system comprises a front-end scheduler and a front-end cache server. A related location rule and an embedded script Lua language are provided in the front-end scheduler. According to the system and the method provided by the invention, by using url rewriting technology and a self-defined header field value in the front-end scheduler, factors that may interfere with caching are eliminated, thereby ensuring a hit rate of caching to a maximum extent; it is ensured that different URLs are cached according to same logic; meanwhile, it is ensured that login users are provided with separate caching logic for a same URL.