text stringlengths 0 234 |
|---|
-- Setup cftab to facilitate generation of T^ ( - 1). |
t := 0; |
for i in 0 .. 256 loop |
nn := cftab (i); |
cftab (i) := t; |
t := t + nn; |
end loop; |
end receive_mtf_values; |
procedure detransform is |
a : Unsigned_32; |
p, q, r, i255 : Natural; |
begin |
a := 0; |
p := tt'First; |
q := p + tt_count; |
while p /= q loop |
i255 := Natural (tt.all (p) and 16#ff#); |
r := cftab (i255); |
cftab (i255) := cftab (i255) + 1; |
tt.all (r) := tt.all (r) or a; |
a := a + 256; |
p := p + 1; |
end loop; |
end detransform; |
-- Cyclic redundancy check to verify uncompressed block data integrity |
package CRC is |
procedure Init (CRC_Value : out Unsigned_32); |
function Final (CRC_Value : Unsigned_32) return Unsigned_32; |
procedure Update (CRC_Value : in out Unsigned_32; val : Unsigned_8); |
pragma Inline (Update); |
end CRC; |
package body CRC is |
CRC32_Table : |
constant array (Unsigned_32'(0) .. 255) of Unsigned_32 := ( |
16#00000000#, 16#04c11db7#, 16#09823b6e#, 16#0d4326d9#, |
16#130476dc#, 16#17c56b6b#, 16#1a864db2#, 16#1e475005#, |
16#2608edb8#, 16#22c9f00f#, 16#2f8ad6d6#, 16#2b4bcb61#, |
16#350c9b64#, 16#31cd86d3#, 16#3c8ea00a#, 16#384fbdbd#, |
16#4c11db70#, 16#48d0c6c7#, 16#4593e01e#, 16#4152fda9#, |
16#5f15adac#, 16#5bd4b01b#, 16#569796c2#, 16#52568b75#, |
16#6a1936c8#, 16#6ed82b7f#, 16#639b0da6#, 16#675a1011#, |
16#791d4014#, 16#7ddc5da3#, 16#709f7b7a#, 16#745e66cd#, |
16#9823b6e0#, 16#9ce2ab57#, 16#91a18d8e#, 16#95609039#, |
16#8b27c03c#, 16#8fe6dd8b#, 16#82a5fb52#, 16#8664e6e5#, |
16#be2b5b58#, 16#baea46ef#, 16#b7a96036#, 16#b3687d81#, |
16#ad2f2d84#, 16#a9ee3033#, 16#a4ad16ea#, 16#a06c0b5d#, |
16#d4326d90#, 16#d0f37027#, 16#ddb056fe#, 16#d9714b49#, |
16#c7361b4c#, 16#c3f706fb#, 16#ceb42022#, 16#ca753d95#, |
16#f23a8028#, 16#f6fb9d9f#, 16#fbb8bb46#, 16#ff79a6f1#, |
16#e13ef6f4#, 16#e5ffeb43#, 16#e8bccd9a#, 16#ec7dd02d#, |
16#34867077#, 16#30476dc0#, 16#3d044b19#, 16#39c556ae#, |
16#278206ab#, 16#23431b1c#, 16#2e003dc5#, 16#2ac12072#, |
16#128e9dcf#, 16#164f8078#, 16#1b0ca6a1#, 16#1fcdbb16#, |
16#018aeb13#, 16#054bf6a4#, 16#0808d07d#, 16#0cc9cdca#, |
16#7897ab07#, 16#7c56b6b0#, 16#71159069#, 16#75d48dde#, |
16#6b93dddb#, 16#6f52c06c#, 16#6211e6b5#, 16#66d0fb02#, |
16#5e9f46bf#, 16#5a5e5b08#, 16#571d7dd1#, 16#53dc6066#, |
16#4d9b3063#, 16#495a2dd4#, 16#44190b0d#, 16#40d816ba#, |
16#aca5c697#, 16#a864db20#, 16#a527fdf9#, 16#a1e6e04e#, |
16#bfa1b04b#, 16#bb60adfc#, 16#b6238b25#, 16#b2e29692#, |
16#8aad2b2f#, 16#8e6c3698#, 16#832f1041#, 16#87ee0df6#, |
16#99a95df3#, 16#9d684044#, 16#902b669d#, 16#94ea7b2a#, |
16#e0b41de7#, 16#e4750050#, 16#e9362689#, 16#edf73b3e#, |
16#f3b06b3b#, 16#f771768c#, 16#fa325055#, 16#fef34de2#, |
16#c6bcf05f#, 16#c27dede8#, 16#cf3ecb31#, 16#cbffd686#, |
16#d5b88683#, 16#d1799b34#, 16#dc3abded#, 16#d8fba05a#, |
16#690ce0ee#, 16#6dcdfd59#, 16#608edb80#, 16#644fc637#, |
16#7a089632#, 16#7ec98b85#, 16#738aad5c#, 16#774bb0eb#, |
16#4f040d56#, 16#4bc510e1#, 16#46863638#, 16#42472b8f#, |
16#5c007b8a#, 16#58c1663d#, 16#558240e4#, 16#51435d53#, |
16#251d3b9e#, 16#21dc2629#, 16#2c9f00f0#, 16#285e1d47#, |
16#36194d42#, 16#32d850f5#, 16#3f9b762c#, 16#3b5a6b9b#, |
16#0315d626#, 16#07d4cb91#, 16#0a97ed48#, 16#0e56f0ff#, |
16#1011a0fa#, 16#14d0bd4d#, 16#19939b94#, 16#1d528623#, |
16#f12f560e#, 16#f5ee4bb9#, 16#f8ad6d60#, 16#fc6c70d7#, |
16#e22b20d2#, 16#e6ea3d65#, 16#eba91bbc#, 16#ef68060b#, |
16#d727bbb6#, 16#d3e6a601#, 16#dea580d8#, 16#da649d6f#, |
16#c423cd6a#, 16#c0e2d0dd#, 16#cda1f604#, 16#c960ebb3#, |
16#bd3e8d7e#, 16#b9ff90c9#, 16#b4bcb610#, 16#b07daba7#, |
16#ae3afba2#, 16#aafbe615#, 16#a7b8c0cc#, 16#a379dd7b#, |
16#9b3660c6#, 16#9ff77d71#, 16#92b45ba8#, 16#9675461f#, |
16#8832161a#, 16#8cf30bad#, 16#81b02d74#, 16#857130c3#, |
16#5d8a9099#, 16#594b8d2e#, 16#5408abf7#, 16#50c9b640#, |
16#4e8ee645#, 16#4a4ffbf2#, 16#470cdd2b#, 16#43cdc09c#, |
16#7b827d21#, 16#7f436096#, 16#7200464f#, 16#76c15bf8#, |
16#68860bfd#, 16#6c47164a#, 16#61043093#, 16#65c52d24#, |
16#119b4be9#, 16#155a565e#, 16#18197087#, 16#1cd86d30#, |
16#029f3d35#, 16#065e2082#, 16#0b1d065b#, 16#0fdc1bec#, |
16#3793a651#, 16#3352bbe6#, 16#3e119d3f#, 16#3ad08088#, |
16#2497d08d#, 16#2056cd3a#, 16#2d15ebe3#, 16#29d4f654#, |
16#c5a92679#, 16#c1683bce#, 16#cc2b1d17#, 16#c8ea00a0#, |
16#d6ad50a5#, 16#d26c4d12#, 16#df2f6bcb#, 16#dbee767c#, |
16#e3a1cbc1#, 16#e760d676#, 16#ea23f0af#, 16#eee2ed18#, |
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