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(.module:
[lux #- i64]
(lux (control [monad #+ do]
["ex" exception #+ exception:]
["eq" equality])
(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
I64
(|> +1 (bit.left-shift +8) dec .i64))
(def: i64
(-> (primitive "java.lang.Byte") I64)
(|>> host.byte-to-long (:! I64) (bit.and byte-mask)))
(def: byte
(-> (I64 Top) (primitive "java.lang.Byte"))
(|>> .int host.long-to-byte))
(def: #export (create size)
(-> Nat Blob)
(host.array byte size))
(def: #export (read-8 idx blob)
(-> Nat Blob (e.Error I64))
(if (n/< (host.array-length blob) idx)
(|> (host.array-read idx blob) ..i64 #e.Success)
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (read-16 idx blob)
(-> Nat Blob (e.Error I64))
(if (n/< (host.array-length blob) (n/+ +1 idx))
(#e.Success ($_ bit.or
(bit.left-shift +8 (..i64 (host.array-read idx blob)))
(..i64 (host.array-read (n/+ +1 idx) blob))))
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (read-32 idx blob)
(-> Nat Blob (e.Error I64))
(if (n/< (host.array-length blob) (n/+ +3 idx))
(#e.Success ($_ bit.or
(bit.left-shift +24 (..i64 (host.array-read idx blob)))
(bit.left-shift +16 (..i64 (host.array-read (n/+ +1 idx) blob)))
(bit.left-shift +8 (..i64 (host.array-read (n/+ +2 idx) blob)))
(..i64 (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 I64))
(if (n/< (host.array-length blob) (n/+ +7 idx))
(#e.Success ($_ bit.or
(bit.left-shift +56 (..i64 (host.array-read idx blob)))
(bit.left-shift +48 (..i64 (host.array-read (n/+ +1 idx) blob)))
(bit.left-shift +40 (..i64 (host.array-read (n/+ +2 idx) blob)))
(bit.left-shift +32 (..i64 (host.array-read (n/+ +3 idx) blob)))
(bit.left-shift +24 (..i64 (host.array-read (n/+ +4 idx) blob)))
(bit.left-shift +16 (..i64 (host.array-read (n/+ +5 idx) blob)))
(bit.left-shift +8 (..i64 (host.array-read (n/+ +6 idx) blob)))
(..i64 (host.array-read (n/+ +7 idx) blob))))
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (write-8 idx value blob)
(-> Nat (I64 Top) Blob (e.Error Blob))
(if (n/< (host.array-length blob) idx)
(exec (|> blob
(host.array-write idx (..byte value)))
(#e.Success blob))
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (write-16 idx value blob)
(-> Nat (I64 Top) Blob (e.Error Blob))
(if (n/< (host.array-length blob) (n/+ +1 idx))
(exec (|> blob
(host.array-write idx (..byte (bit.logical-right-shift +8 value)))
(host.array-write (n/+ +1 idx) (..byte value)))
(#e.Success blob))
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (write-32 idx value blob)
(-> Nat (I64 Top) Blob (e.Error Blob))
(if (n/< (host.array-length blob) (n/+ +3 idx))
(exec (|> blob
(host.array-write idx (..byte (bit.logical-right-shift +24 value)))
(host.array-write (n/+ +1 idx) (..byte (bit.logical-right-shift +16 value)))
(host.array-write (n/+ +2 idx) (..byte (bit.logical-right-shift +8 value)))
(host.array-write (n/+ +3 idx) (..byte value)))
(#e.Success blob))
(ex.throw index-out-of-bounds (%n idx))))
(def: #export (write-64 idx value blob)
(-> Nat (I64 Top) Blob (e.Error Blob))
(if (n/< (host.array-length blob) (n/+ +7 idx))
(exec (|> blob
(host.array-write idx (..byte (bit.logical-right-shift +56 value)))
(host.array-write (n/+ +1 idx) (..byte (bit.logical-right-shift +48 value)))
(host.array-write (n/+ +2 idx) (..byte (bit.logical-right-shift +40 value)))
(host.array-write (n/+ +3 idx) (..byte (bit.logical-right-shift +32 value)))
(host.array-write (n/+ +4 idx) (..byte (bit.logical-right-shift +24 value)))
(host.array-write (n/+ +5 idx) (..byte (bit.logical-right-shift +16 value)))
(host.array-write (n/+ +6 idx) (..byte (bit.logical-right-shift +8 value)))
(host.array-write (n/+ +7 idx) (..byte value)))
(#e.Success blob))
(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 (inc to))]))))))
(def: #export (slice' from blob)
(-> Nat Blob (e.Error Blob))
(slice from (dec (host.array-length blob)) blob))
(struct: #export _ (eq.Eq Blob)
(def: (= reference sample)
(Arrays::equals [reference sample])))
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