mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 01:52:46 +00:00
51 lines
1.3 KiB
Go
51 lines
1.3 KiB
Go
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package binary
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import (
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"bytes"
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"fmt"
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"github.com/tetratelabs/wazero/api"
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"github.com/tetratelabs/wazero/internal/wasm"
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)
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// decodeGlobal returns the api.Global decoded with the WebAssembly 1.0 (20191205) Binary Format.
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//
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// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#binary-global
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func decodeGlobal(r *bytes.Reader, enabledFeatures api.CoreFeatures, ret *wasm.Global) (err error) {
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ret.Type, err = decodeGlobalType(r)
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if err != nil {
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return err
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}
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err = decodeConstantExpression(r, enabledFeatures, &ret.Init)
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return
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}
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// decodeGlobalType returns the wasm.GlobalType decoded with the WebAssembly 1.0 (20191205) Binary Format.
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//
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// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#binary-globaltype
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func decodeGlobalType(r *bytes.Reader) (wasm.GlobalType, error) {
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vt, err := decodeValueTypes(r, 1)
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if err != nil {
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return wasm.GlobalType{}, fmt.Errorf("read value type: %w", err)
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}
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ret := wasm.GlobalType{
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ValType: vt[0],
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}
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b, err := r.ReadByte()
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if err != nil {
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return wasm.GlobalType{}, fmt.Errorf("read mutablity: %w", err)
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}
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switch mut := b; mut {
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case 0x00: // not mutable
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case 0x01: // mutable
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ret.Mutable = true
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default:
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return wasm.GlobalType{}, fmt.Errorf("%w for mutability: %#x != 0x00 or 0x01", ErrInvalidByte, mut)
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}
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return ret, nil
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}
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