1 package binary
2
3 import (
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
12 func 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, 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 }
53
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