ref: 228b30bfe204fc490e16eec6ba5484991a765074
dir: /lib/flate/test/flate.myr/
use bio
use flate
use std
use testr
impl std.equatable std.result(int, flate.err) =
eq = {a, b
match (a, b)
| (`std.Ok na, `std.Ok nb): -> na == nb
| (`std.Err (`flate.Io ea), `std.Err (`flate.Io eb)): -> ea == eb
| (`std.Err (`flate.Format ea), `std.Err (`flate.Format eb)):
-> std.sleq(ea, eb)
| _: -> false
;;
}
;;
const init = {in -> flate.flatedec#
-> std.mk([
.rdf = bio.mkmem(in),
.bpos = 8,
])
}
const eof = `std.Err (`flate.Io `bio.Eof)
const bits = {ctx
var st
st = init("")
testr.eq(ctx, flate.bits(st, 1), eof)
st = init(" ")
testr.eq(ctx, flate.bits(st, 9), eof)
/* simple bit reading */
st = init("\xaa")
testr.eq(ctx, flate.bits(st, 0), `std.Ok 0)
testr.eq(ctx, flate.bits(st, 1), `std.Ok 0)
testr.eq(ctx, flate.bits(st, 1), `std.Ok 1)
testr.eq(ctx, flate.bits(st, 2), `std.Ok 2)
testr.eq(ctx, flate.bits(st, 3), `std.Ok 2)
testr.eq(ctx, flate.bits(st, 2), eof)
/* reading across byte boundaries */
st = init("\xaa\xaa")
testr.eq(ctx, flate.bits(st, 2), `std.Ok 2)
testr.eq(ctx, flate.bits(st, 8+2), `std.Ok 0x2aa)
testr.eq(ctx, flate.bits(st, 1), `std.Ok 0)
testr.eq(ctx, flate.bits(st, 4), eof)
/* reading whole bytes */
st = init("\xab\xcd")
testr.eq(ctx, flate.bits(st, 8), `std.Ok 0xab)
testr.eq(ctx, flate.bits(st, 8), `std.Ok 0xcd)
/* refilling */
st = init("")
var n = 0
var pn = &n
st.rdf = bio.mk(bio.Rd, [
.read = {buf
buf[0] = (++pn# : byte)
-> `std.Ok 1
}
])
testr.eq(ctx, flate.bits(st, 3), `std.Ok 1)
testr.eq(ctx, flate.bits(st, 8), `std.Ok (2 << 5))
testr.eq(ctx, flate.bits(st, 10), `std.Ok (3 << 5))
}
const mkhufc = {ctx
var count
var ht
count = [
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
][:]
flate.mkhufc([][:], &ht)
testr.check(ctx, std.eq(ht.count[:], count), "empty code")
flate.mkhufc([1, 1][:], &ht)
count[1] = 2
testr.check(ctx, std.eq(ht.count[:], count), "1-bit code")
testr.eq(ctx, ht.symbol[:2], [0, 1][:])
flate.mkhufc([2, 1, 3, 3][:], &ht)
std.slcp(count[1:4], [1, 1, 2][:])
testr.check(ctx, std.eq(ht.count[:], count), "rfc code")
testr.eq(ctx, ht.symbol[:4], [1, 0, 2, 3][:])
}
const readcode = {ctx
var st, ht
flate.mkhufc([2, 1, 3, 3][:], &ht)
st = init("\xcd\x05")
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 0)
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 2)
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 1)
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 3)
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 1)
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 0)
testr.eq(ctx, st.bpos, 4)
/* same as above with some empty codes */
flate.mkhufc([2, 1, 0, 0, 3, 0, 3][:], &ht)
st = init("\xcd\x05")
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 0)
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 4)
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 1)
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 6)
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 1)
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 0)
testr.eq(ctx, st.bpos, 4)
/* empty codes at the beginning */
flate.mkhufc([0, 0, 0, 4][:], &ht)
st = init("\x00")
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 3)
testr.eq(ctx, flate.readcode(st, &ht), `std.Ok 3)
testr.eq(ctx, flate.readcode(st, &ht), eof)
}
const bitsf = {str : byte[:]
var sl, n, b
sl = [][:]
n = 0
b = 0
for c : str
match (c : char)
| '0': n++
| '1': b += (1 << n); n++
| _: /* do nothing */
;;
if n == 8
std.slpush(&sl, (b : byte))
n = 0
b = 0
;;
;;
std.slpush(&sl, (b : byte))
-> bio.mkmem(sl)
}
const expect = {ctx, t, str
var exp
exp = std.mk(str)
const write = {buf
if buf.len > exp#.len
testr.fail(ctx,
"({}) more bytes written than expected:" \
" '{}' written when expecting '{}'",
t, buf, exp#)
;;
if !std.eq(buf, exp#[:buf.len])
testr.fail(ctx,
"({}) '{}' written when expecting '{}'",
t, buf, exp#[:buf.len])
;;
exp# = exp#[buf.len:]
-> `std.Ok buf.len
}
const close = {
if exp#.len > 0
testr.fail(ctx,
"({}) output closed when still expecting '{}'",
t, exp#)
;;
-> true
}
-> bio.mk(bio.Wr, [.write = write, .close = close])
}
type errortype = union
`None
`Eof
`Io
`Format
;;
const decode = {ctx
const tests = [
("empty",
"",
"", `Eof),
("reserved block",
"1 11 00",
"", `Format),
("partial block",
"1 1",
"", `Eof), /* could be `Format error... */
("uncompressed empty block",
"1 00 00000 0000000000000000 1111111111111111",
"", `None),
("uncompressed 3-bytes block",
"1 00 00000 1100000000000000 0011111111111111" \
"10000110 01000110 11000110",
"abc", `None),
("uncompressed 1-byte then 2-bytes block",
"0 00 00000 1000000000000000 0111111111111111" \
"10000110" \
"1 00 00000 0100000000000000 1011111111111111" \
"01000110 11000110",
"abc", `None),
("uncompressed mismatched len nlen",
"1 00 00000 1000000000000000 0111111111111011" \
"10000110",
"", `Format),
("fixed code single block",
"1 10 10011000 10010101 10011100 10011100" \
"10011111 01010001 0000000",
"hello!", `None),
("dynamic code block",
// 'r' markers are used when bits must come in "reverse"
"1 01" \
"r00000 r00000 r1111" \ // 257 literal, 1 distance, 19 code codes
"r101 101 101 101 101 101 101 101 101 101 101 101" \
" 101 101 101 101 101 101 101" \ // All 14 code codes of length 5
"10010 r0110101" \ // 97 zeroes
"00011 00011 00011" \ // then three times 3
"10010 r1111111 10010 r1110000" \ // then 156 (= 11+127 + 11+7) zeroes
"00011" \ // then 3 once (end of block)
"00000" \ // one unused length code
"000 001 010 011", // finally, some data
"abc", `None),
("dynamic code block with reference",
"1 01" \
"r01000 r10000 r1111" \ // 258 literal, 2 distance, 19 code codes
"r101 101 101 101 101 101 101 101 101 101 101 101" \
" 101 101 101 101 101 101 101" \ // All 14 code codes of length 5
"10010 r0110101" \ // 97 zeroes
"00011 00011 00011" \ // then three times 3
"10010 r1111111 10010 r1110000" \ // then 156 (= 11+127 + 11+7) zeroes
"00011 00000 00011" \ // then 3, 0, 3 (ref of length 4)
"00010 00010" \ // two size two distance code
"000 001 010 100 01 011", // use the reference at the end
"abcbcbc", `None),
("dynamic code with invalid reference",
"1 01" \
"r01000 r10000 r1111" \
"r101 101 101 101 101 101 101 101 101 101 101 101" \
" 101 101 101 101 101 101 101" \
"10010 r0110101" \
"00011 00011 00011" \
"10010 r1111111 10010 r1110000" \
"00011 00000 00011" \
"00010 00010" \
"000 100 01",
"a", `Format),
("dynamic code with cross-blocks reference",
"0 00 00000 1100000000000000 0011111111111111" \
"10000110 01000110 11000110" \ // "abc" uncompressed
"1 01" \
"r01000 r00000 r1000" \ // 258 literal, 1 distance, 5 code codes
"r110 110 110 000 010" \ // code lengths of 3, 3, 3, 0, 2
\ // for 16, 17, 18, 0, 8
"100 r1111111" \ // 138 zeroes
"100 r1101011" \ // +118 zeroes = 256 zeroes
"00" \ // 256 (=EOB) has length 8
"010 r00" \ // repeat this length 3 times
"00000001 00000000 00000000", // one reference, then EOB
"abcccc", `None),
]
var outf, err
for (t, in, out, experr) : tests
outf = expect(ctx, t, out)
err = flate.decode(outf, bitsf(in))
match (err, experr)
| (`std.Ok _, `None):
| (`std.Err (`flate.Io `bio.Eof), `Eof):
| (`std.Err (`flate.Io _), `Io):
| (`std.Err (`flate.Format _), `Format):
| _:
testr.fail(ctx,
"({}) {} error expected but got {} instead",
t, experr, err)
;;
bio.close(outf)
;;
}
const main = {
testr.run([
[.name = "bits", .fn = bits],
[.name = "mkhufc", .fn = mkhufc],
[.name = "readcode", .fn = readcode],
[.name = "decode", .fn = decode],
][:])
}