40 lines
1.0 KiB
Go
40 lines
1.0 KiB
Go
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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// decodeTable returns the wasm.Table 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-table
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func decodeTable(r *bytes.Reader, enabledFeatures api.CoreFeatures, ret *wasm.Table) (err error) {
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ret.Type, err = r.ReadByte()
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if err != nil {
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return fmt.Errorf("read leading byte: %v", err)
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}
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if ret.Type != wasm.RefTypeFuncref {
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if err = enabledFeatures.RequireEnabled(api.CoreFeatureReferenceTypes); err != nil {
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return fmt.Errorf("table type funcref is invalid: %w", err)
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}
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}
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ret.Min, ret.Max, err = decodeLimitsType(r)
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if err != nil {
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return fmt.Errorf("read limits: %v", err)
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}
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if ret.Min > wasm.MaximumFunctionIndex {
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return fmt.Errorf("table min must be at most %d", wasm.MaximumFunctionIndex)
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}
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if ret.Max != nil {
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if *ret.Max < ret.Min {
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return fmt.Errorf("table size minimum must not be greater than maximum")
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}
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}
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return
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}
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