December 2002
Intermediate to advanced
454 pages
25h 39m
English
Content preview from Lossless Compression Handbook
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CHAPTER 7 / BURROWS-WHEELER COMPRESSION 173
We are now in a position to build the links which will be used to traverse the received data.
The mapping array M initially points to the first positions of the contexts. As a symbol s is used
from a context, M [ s ] is incremented so that it tracks the next context starting with "s".
for(i = i; i <= N; i++)
{
s = S[i]; /* get current symbol */
L[i] = M[s] ; /* set link from mapping table */
M[s] ++; /* increment mapping */
}
Although we never actually prepare an explicit list of the contexts (or rather their initial
symbols), the steps so far are equivalent to ...
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