97c759b9d8
This flattens Memory and Table types, particularly making it a compilation error to add multiple of either. This also backfills binary encoding of Table. Signed-off-by: Adrian Cole <adrian@tetrate.io>
37 lines
1.0 KiB
Go
37 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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wasm "github.com/tetratelabs/wazero/internal/wasm"
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)
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// decodeMemory returns the wasm.Memory 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-memory
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func decodeMemory(r *bytes.Reader) (*wasm.Memory, error) {
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min, max, err := decodeLimitsType(r)
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if err != nil {
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return nil, err
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}
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if min > wasm.MemoryMaxPages {
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return nil, fmt.Errorf("memory min must be at most 65536 pages (4GiB)")
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}
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if max != nil {
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if *max < min {
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return nil, fmt.Errorf("memory size minimum must not be greater than maximum")
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} else if *max > wasm.MemoryMaxPages {
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return nil, fmt.Errorf("memory max must be at most 65536 pages (4GiB)")
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}
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}
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return &wasm.Memory{Min: min, Max: max}, nil
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}
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// encodeMemory returns the internalwasm.Memory encoded in 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-memory
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func encodeMemory(i *wasm.Memory) []byte {
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return encodeLimitsType(i.Min, i.Max)
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}
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