Zigzag

Many crc routine in C

lz4 压缩解压速度超快，比zip lzo等算法(lz4 compress )

pdf转换器，可将pdf文件转换为各种形式，并可直接编辑pdf文件(pdf converter, pdf files can be converted to a variety of forms, and can directly edit the pdf file)

从Zip文件创建，添加，提取，更新，删除文件 读/写密码保护的Zip文件 支持AES 128/256加密 支持标准邮??编加密 支持Zip64格式 支持存储（无压缩）和Deflate压缩方法 从Split Zip文件创建或提取文件（例如：z01，z02，... zip） 支持Unicode文件名 进度监视器(Create, add, extract, update, delete files from Zip files Read/write password-protected Zip files Support for AES 128/256 encryption Supporting Standard Postal Encryption Support Zip64 format Supporting storage (uncompressed) and Deflate compression methods Create or extract files from Split Zip files (e.g. z01, z02,... Zip))

huffman 编码 完陈对指定的文本文件内容进行huffman编码 实现输出(END CHAN huffman encoding text file on the specified content encoding huffman implementation output)

melp编解码，压缩率2.4Kbps，1.2Kbps(MELP codec, compression rate 2.4Kbps, 1.2Kbps)

对于哈夫曼编码的仿真，可以计算平均码长、熵、压缩比、编码效率(Simulation of Huffman coding)

Codes". Huffman coding uses a specific method for choosing the representation for each symbol, resulting in a prefix code (sometimes called "prefix-free codes") (that is, the bit string representing some particular symbol is never a prefix of the bit string representing any other symbol) that expresses the most common characters using shorter strings of bits than are used for less common source symbols. Huffman was able to design the most efficient compression method of this type: no other mapping of individual source symbols to unique strings of bits will produce a smaller average output size when the actual symbol frequencies agree with those used to create the code. A method was later found to do this in linear time if input probabilities (also known as weights) are sorted.

video compression using matlab

课设时做的学生成绩管理系统，希望对大家有参考价值(Lesson set up to do when the student achievement management system that everyone would like to have reference value)