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(.module:
lux
(lux (control [monad #+ do]
["ex" exception #+ exception:]
[eq])
(data [bit]
[maybe]
["e" error]
text/format)
[host]))
(exception: #export (index-out-of-bounds {description Text})
description)
(exception: #export (inverted-range {description Text})
description)
(type: #export Blob (host.type (Array byte)))
(host.import java/util/Arrays
(#static copyOfRange [(Array byte) int int] (Array byte))
(#static equals [(Array byte) (Array byte)] boolean))
(def: byte-mask
Nat
(|> +1 (bit.shift-left +8) n/dec))
(def: byte-to-nat
(-> (primitive "java.lang.Byte") Nat)
(|>> host.byte-to-long (:! Nat) (bit.and byte-mask)))
(def: #export (create size)
(-> Nat Blob)
(host.array byte size))
(def: #export (read-8 idx blob)
(-> Nat Blob (e.Error Nat))
(if (n/< (host.array-length blob) idx)
(|> (host.array-read idx blob) byte-to-nat #e.Success)
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (read-16 idx blob)
(-> Nat Blob (e.Error Nat))
(if (n/< (host.array-length blob) (n/+ +1 idx))
(#e.Success ($_ bit.or
(bit.shift-left +8 (byte-to-nat (host.array-read idx blob)))
(byte-to-nat (host.array-read (n/+ +1 idx) blob))))
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (read-32 idx blob)
(-> Nat Blob (e.Error Nat))
(if (n/< (host.array-length blob) (n/+ +3 idx))
(#e.Success ($_ bit.or
(bit.shift-left +24 (byte-to-nat (host.array-read idx blob)))
(bit.shift-left +16 (byte-to-nat (host.array-read (n/+ +1 idx) blob)))
(bit.shift-left +8 (byte-to-nat (host.array-read (n/+ +2 idx) blob)))
(byte-to-nat (host.array-read (n/+ +3 idx) blob))))
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (read-64 idx blob)
(-> Nat Blob (e.Error Nat))
(if (n/< (host.array-length blob) (n/+ +7 idx))
(#e.Success ($_ bit.or
(bit.shift-left +56 (byte-to-nat (host.array-read idx blob)))
(bit.shift-left +48 (byte-to-nat (host.array-read (n/+ +1 idx) blob)))
(bit.shift-left +40 (byte-to-nat (host.array-read (n/+ +2 idx) blob)))
(bit.shift-left +32 (byte-to-nat (host.array-read (n/+ +3 idx) blob)))
(bit.shift-left +24 (byte-to-nat (host.array-read (n/+ +4 idx) blob)))
(bit.shift-left +16 (byte-to-nat (host.array-read (n/+ +5 idx) blob)))
(bit.shift-left +8 (byte-to-nat (host.array-read (n/+ +6 idx) blob)))
(byte-to-nat (host.array-read (n/+ +7 idx) blob))))
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (write-8 idx value blob)
(-> Nat Nat Blob (e.Error Top))
(if (n/< (host.array-length blob) idx)
(exec (|> blob
(host.array-write idx (host.long-to-byte (:! Int value))))
(#e.Success []))
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (write-16 idx value blob)
(-> Nat Nat Blob (e.Error Top))
(if (n/< (host.array-length blob) (n/+ +1 idx))
(exec (|> blob
(host.array-write idx (host.long-to-byte (:! Int (bit.shift-right +8 value))))
(host.array-write (n/+ +1 idx) (host.long-to-byte (:! Int value))))
(#e.Success []))
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (write-32 idx value blob)
(-> Nat Nat Blob (e.Error Top))
(if (n/< (host.array-length blob) (n/+ +3 idx))
(exec (|> blob
(host.array-write idx (host.long-to-byte (:! Int (bit.shift-right +24 value))))
(host.array-write (n/+ +1 idx) (host.long-to-byte (:! Int (bit.shift-right +16 value))))
(host.array-write (n/+ +2 idx) (host.long-to-byte (:! Int (bit.shift-right +8 value))))
(host.array-write (n/+ +3 idx) (host.long-to-byte (:! Int value))))
(#e.Success []))
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (write-64 idx value blob)
(-> Nat Nat Blob (e.Error Top))
(if (n/< (host.array-length blob) (n/+ +7 idx))
(exec (|> blob
(host.array-write idx (host.long-to-byte (:! Int (bit.shift-right +56 value))))
(host.array-write (n/+ +1 idx) (host.long-to-byte (:! Int (bit.shift-right +48 value))))
(host.array-write (n/+ +2 idx) (host.long-to-byte (:! Int (bit.shift-right +40 value))))
(host.array-write (n/+ +3 idx) (host.long-to-byte (:! Int (bit.shift-right +32 value))))
(host.array-write (n/+ +4 idx) (host.long-to-byte (:! Int (bit.shift-right +24 value))))
(host.array-write (n/+ +5 idx) (host.long-to-byte (:! Int (bit.shift-right +16 value))))
(host.array-write (n/+ +6 idx) (host.long-to-byte (:! Int (bit.shift-right +8 value))))
(host.array-write (n/+ +7 idx) (host.long-to-byte (:! Int value))))
(#e.Success []))
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (size blob)
(-> Blob Nat)
(host.array-length blob))
(def: #export (slice from to blob)
(-> Nat Nat Blob (e.Error Blob))
(with-expansions [<description> (as-is (format "from = " (%n from) " | " "to = " (%n to)))]
(let [size (host.array-length blob)]
(cond (not (n/<= to from))
(ex.throw inverted-range <description>)
(not (and (n/< size from)
(n/< size to)))
(ex.throw index-out-of-bounds <description>)
## else
(#e.Success (Arrays::copyOfRange [blob (:! Int from) (:! Int (n/inc to))]))))))
(def: #export (slice' from blob)
(-> Nat Blob (e.Error Blob))
(slice from (n/dec (host.array-length blob)) blob))
(struct: #export _ (eq.Eq Blob)
(def: (= reference sample)
(Arrays::equals [reference sample])))
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