mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 01:52:46 +00:00
61 lines
1.6 KiB
Go
61 lines
1.6 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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"io"
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"unicode/utf8"
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"unsafe"
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"github.com/tetratelabs/wazero/internal/leb128"
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"github.com/tetratelabs/wazero/internal/wasm"
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)
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func decodeValueTypes(r *bytes.Reader, num uint32) ([]wasm.ValueType, error) {
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if num == 0 {
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return nil, nil
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}
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ret := make([]wasm.ValueType, num)
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_, err := io.ReadFull(r, ret)
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if err != nil {
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return nil, err
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}
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for _, v := range ret {
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switch v {
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case wasm.ValueTypeI32, wasm.ValueTypeF32, wasm.ValueTypeI64, wasm.ValueTypeF64,
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wasm.ValueTypeExternref, wasm.ValueTypeFuncref, wasm.ValueTypeV128:
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default:
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return nil, fmt.Errorf("invalid value type: %d", v)
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}
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}
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return ret, nil
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}
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// decodeUTF8 decodes a size prefixed string from the reader, returning it and the count of bytes read.
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// contextFormat and contextArgs apply an error format when present
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func decodeUTF8(r *bytes.Reader, contextFormat string, contextArgs ...interface{}) (string, uint32, error) {
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size, sizeOfSize, err := leb128.DecodeUint32(r)
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if err != nil {
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return "", 0, fmt.Errorf("failed to read %s size: %w", fmt.Sprintf(contextFormat, contextArgs...), err)
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}
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if size == 0 {
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return "", uint32(sizeOfSize), nil
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}
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buf := make([]byte, size)
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if _, err = io.ReadFull(r, buf); err != nil {
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return "", 0, fmt.Errorf("failed to read %s: %w", fmt.Sprintf(contextFormat, contextArgs...), err)
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}
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if !utf8.Valid(buf) {
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return "", 0, fmt.Errorf("%s is not valid UTF-8", fmt.Sprintf(contextFormat, contextArgs...))
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}
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// TODO: use unsafe.String after flooring Go 1.20.
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ret := *(*string)(unsafe.Pointer(&buf))
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return ret, size + uint32(sizeOfSize), nil
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}
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