1package binary
 2
 3import (
 4	"bytes"
 5	"fmt"
 6
 7	"github.com/tetratelabs/wazero/api"
 8	"github.com/tetratelabs/wazero/internal/leb128"
 9	"github.com/tetratelabs/wazero/internal/wasm"
10)
11
12func decodeImport(
13	r *bytes.Reader,
14	idx uint32,
15	memorySizer memorySizer,
16	memoryLimitPages uint32,
17	enabledFeatures api.CoreFeatures,
18	ret *wasm.Import,
19) (err error) {
20	if ret.Module, _, err = decodeUTF8(r, "import module"); err != nil {
21		err = fmt.Errorf("import[%d] error decoding module: %w", idx, err)
22		return
23	}
24
25	if ret.Name, _, err = decodeUTF8(r, "import name"); err != nil {
26		err = fmt.Errorf("import[%d] error decoding name: %w", idx, err)
27		return
28	}
29
30	b, err := r.ReadByte()
31	if err != nil {
32		err = fmt.Errorf("import[%d] error decoding type: %w", idx, err)
33		return
34	}
35	ret.Type = b
36	switch ret.Type {
37	case wasm.ExternTypeFunc:
38		ret.DescFunc, _, err = leb128.DecodeUint32(r)
39	case wasm.ExternTypeTable:
40		err = decodeTable(r, enabledFeatures, &ret.DescTable)
41	case wasm.ExternTypeMemory:
42		ret.DescMem, err = decodeMemory(r, enabledFeatures, memorySizer, memoryLimitPages)
43	case wasm.ExternTypeGlobal:
44		ret.DescGlobal, err = decodeGlobalType(r)
45	default:
46		err = fmt.Errorf("%w: invalid byte for importdesc: %#x", ErrInvalidByte, b)
47	}
48	if err != nil {
49		err = fmt.Errorf("import[%d] %s[%s.%s]: %w", idx, wasm.ExternTypeName(ret.Type), ret.Module, ret.Name, err)
50	}
51	return
52}