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Original file line number | Diff line number | Diff line change |
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;; Copyright 2024, Offchain Labs, Inc. | ||
;; For license information, see https://github.com/OffchainLabs/nitro/blob/master/LICENSE | ||
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||
(module | ||
(import "vm_hooks" "pay_for_memory_grow" (func (param i32))) | ||
(import "vm_hooks" "read_args" (func $read_args (param i32))) | ||
(import "vm_hooks" "write_result" (func $write_result (param i32 i32))) | ||
(func (export "user_entrypoint") (param $args_len i32) (result i32) | ||
(local $size i32) | ||
|
||
;; read input | ||
i32.const 0 | ||
call $read_args | ||
|
||
;; read the target size from the last 4 bytes of the input big endian | ||
;; byte 1 | ||
local.get $args_len | ||
i32.const 1 | ||
i32.sub | ||
local.tee $size | ||
i32.load8_u | ||
|
||
;; byte 2 | ||
local.get $size | ||
i32.const 1 | ||
i32.sub | ||
local.tee $size | ||
i32.load8_u | ||
i32.const 8 | ||
i32.shl | ||
i32.or | ||
|
||
;; byte 3 | ||
local.get $size | ||
i32.const 1 | ||
i32.sub | ||
local.tee $size | ||
i32.load8_u | ||
i32.const 16 | ||
i32.shl | ||
i32.or | ||
|
||
;; byte 4 | ||
local.get $size | ||
i32.const 1 | ||
i32.sub | ||
local.tee $size | ||
i32.load8_u | ||
i32.const 32 | ||
i32.shl | ||
i32.or | ||
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||
local.tee $size | ||
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||
;; grow memory enough to handle the output | ||
;; we start with one page allocated, so no need to round up | ||
i32.const 65536 | ||
i32.div_u | ||
memory.grow | ||
drop | ||
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;; set return data | ||
i32.const 0 | ||
local.get $size | ||
call $write_result | ||
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;; return success | ||
i32.const 0 | ||
) | ||
(memory (export "memory") 1) | ||
) |
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