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############################################################################
#
# File: hufftab.icn
#
# Subject: Program to compute Huffman state transitions
#
# Author: Gregg M. Townsend
#
# Date: November 14, 1994
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# Each input line should be a string of 0s & 1s followed by a value
# field. Output is a list of items in a form suitable for inclusion
# by a C program as initialization for an array. Each pair of items
# indicates the action to be taken on receipt of a 0 or 1 bit from the
# corresponding state; this is either a state number if more decoding
# is needed or the value field from the input if not. State 0 is the
# initial state; 0 is output only for undefined states. States are
# numbered by two to facilitate use of a one-dimensional array.
#
# sample input: corresponding output:
# 00 a /* 0 */ 2, c, a, 4, 0, b,
# 011 b
# 1 c [new line started every 10 entries]
#
# Interpretation:
# from state 0, input=0 => go to state 2, input=1 => return c
# from state 2, input=0 => return a, input=1 => go to state 4
# from state 4, input=0 => undefined, input=1 => return b
#
############################################################################
global curstate, sttab, line
procedure main()
local code, val, n
sttab := list()
put(sttab)
put(sttab)
while line := read() do {
line ? {
if ="#" | pos(0) then next
(code := tab(many('01'))) | (write(&errout, "bad: ", line) & next)
tab(many(' \t'))
val := tab(0)
}
curstate := 1
every bit(!code[1:-1])
curstate +:= code[-1]
if \sttab[curstate] then write(&errout, "dupl: ", line)
sttab[curstate] := val
}
write("/* generated by machine -- do not edit! */")
write()
writes("/* 0 */")
out(sttab[1])
every n := 2 to *sttab do {
if n % 10 = 1 then writes("\n/* ", n-1, " */")
out(sttab[n])
}
write()
end
procedure bit(c)
curstate +:= c
if integer(sttab[curstate]) then {
curstate := sttab[curstate]
return
}
if type(sttab[curstate]) == "string" then write(&errout, "dupl: ", line)
curstate := sttab[curstate] := *sttab + 1
put(sttab)
put(sttab)
end
procedure out(v)
if type(v) == "integer" then
writes(right(v-1, 6), ",")
else
writes(right(\v | "0", 6), ",")
end
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