66 lines
1.6 KiB
Text
66 lines
1.6 KiB
Text
/-
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Copyright (c) 2019 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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-/
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prelude
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import init.data.array.basic init.data.uint init.data.option.basic
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universes u
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structure ByteArray :=
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(data : Array UInt8)
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attribute [extern cpp "lean::byte_array_mk"] ByteArray.mk
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attribute [extern cpp "lean::byte_array_data"] ByteArray.data
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namespace ByteArray
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@[extern cpp inline "lean::mk_empty_byte_array(#1)"]
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def mkEmpty (c : @& Nat) : ByteArray :=
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{ data := Array.empty }
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def empty : ByteArray :=
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mkEmpty 0
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instance : Inhabited ByteArray :=
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⟨empty⟩
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@[extern cpp "lean::byte_array_push"]
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def push : ByteArray → UInt8 → ByteArray
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| ⟨bs⟩, b => ⟨bs.push b⟩
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@[extern cpp "lean::byte_array_size"]
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def size : (@& ByteArray) → Nat
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| ⟨bs⟩ => bs.size
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@[extern cpp "lean::byte_array_get"]
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def get : (@& ByteArray) → (@& Nat) → UInt8
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| ⟨bs⟩, i => bs.get i
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@[extern cpp "lean::byte_array_set"]
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def set : ByteArray → (@& Nat) → UInt8 → ByteArray
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| ⟨bs⟩, i, b => ⟨bs.set i b⟩
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def isEmpty (s : ByteArray) : Bool :=
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s.size == 0
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partial def toListAux (bs : ByteArray) : Nat → List UInt8 → List UInt8
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| i, r =>
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if i < bs.size then
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toListAux (i+1) (bs.get i :: r)
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else
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r.reverse
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def toList (bs : ByteArray) : List UInt8 :=
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toListAux bs 0 []
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end ByteArray
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def List.toByteArrayAux : List UInt8 → ByteArray → ByteArray
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| [], r => r
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| b::bs, r => List.toByteArrayAux bs (r.push b)
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def List.toByteArray (bs : List UInt8) : ByteArray :=
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bs.toByteArrayAux ByteArray.empty
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instance : HasToString ByteArray :=
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⟨fun bs => bs.toList.toString⟩
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