V.42 bis source program

Because the compression protocol for grouping data in the TETRA standard is v.42 bis, students can find Code. After searching for half a day, the students only found the LZW Code but not v.42bis. Although there were few differences between the two, they were still different, so they had to find them by themselves. In fact, it is easy to find out. on Google codesearch, enter v42bis. I found a file in the spandsp library, which is clearly written and has complete annotations. Spandsp is a signal processing database dedicated to the telephone field, including various Speech Coding and protocol processing. It can also be found here, for example, the HDLC protocol used in the project. Google codesearch is much easier to search for code than Google.