Compression of executable document in embedded type system and its loading method

Abstract

The invention relates to a compressing and loading method of executable files in an embedded system, including the steps: using the executable file processing method to process an originally-structured executable file, modifying the file identification symbols in the file head of the executable file, keeping other data invariant to express the executable file as an executable file processed by compression, so as to generate the compressed executable file; identifying the file head of the compressed executable file: if it is the compressed executable file, completing the branches of data decompression to decompress all the data and code segments; placing the decompressed data segments in the accurate positions in a memory according to the rule that the system normally loads an executable file. It has wide application range, high reliability and low cost for embedded systems.

Description

technical field [0001] The method of the invention relates to a method for compressing and loading an executable file, in particular to a method for compressing an executable file in an embedded operating system and loading a compressed executable file. Background technique [0002] In a computer system, in order to reduce the storage space occupied by files, files are usually stored in a compressed manner, and file compression can be divided into two types: transparent compression and opaque compression. [0003] The so-called opaque compression is the most commonly used compression method. This method uses a specific compression tool (program) and a specific compression algorithm to compress the source file to obtain a compressed file that occupies less space; When extracting a file, use corresponding tools and algorithms to decompress the compressed file to obtain the source file. Since the operating system and other programs in the system cannot directly use the compres...

AI Technical Summary

Problems solved by technology

So in fact this way is very uneconomical

[0012] 2. The compressed file system needs to increase the processing of the compressed driver layer in the entire file system operation, so it will inevitably have an impact on the performance of the system

In an embedded system using a compressed file system, all file data operations will be processed by the compressed driver layer, resulting in a large additional overhead for the system, which is especially noticeable in embedded systems with limited system processing capabilities

[0013] 3. The existing compressed file systems have certain media dependencies, but the actual embedded system construction methods vary widely, and it may not be possible to find a compressed file system that meets the requirements in all embedded system storage configurations.

[0014] 4. The compression rate of the compressed file system is not high

In order to achieve a higher data compression rate, it is necessary to compress a larger capacity of related data, and compressing more related data will lead to an increase in the delay of data operations

In order to balance performance and efficiency, the compression efficiency of general compressed file systems is not very high

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