153 lines
3.2 KiB
Go
153 lines
3.2 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package binres
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import (
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"archive/zip"
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"bytes"
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"compress/gzip"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"golang.org/x/mobile/internal/sdkpath"
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)
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// MinSDK is the targeted sdk version for support by package binres.
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const MinSDK = 16
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func apiResources() ([]byte, error) {
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apiResPath, err := apiResourcesPath()
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if err != nil {
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return nil, err
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}
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zr, err := zip.OpenReader(apiResPath)
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if err != nil {
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if os.IsNotExist(err) {
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return nil, fmt.Errorf(`%v; consider installing with "android update sdk --all --no-ui --filter android-%d"`, err, MinSDK)
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}
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return nil, err
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}
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defer zr.Close()
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buf := new(bytes.Buffer)
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for _, f := range zr.File {
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if f.Name == "resources.arsc" {
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rc, err := f.Open()
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if err != nil {
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return nil, err
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}
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_, err = io.Copy(buf, rc)
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if err != nil {
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return nil, err
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}
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rc.Close()
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break
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}
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}
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if buf.Len() == 0 {
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return nil, fmt.Errorf("failed to read resources.arsc")
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}
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return buf.Bytes(), nil
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}
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func apiResourcesPath() (string, error) {
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platformDir, err := sdkpath.AndroidAPIPath(MinSDK)
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if err != nil {
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return "", err
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}
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return filepath.Join(platformDir, "android.jar"), nil
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}
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// PackResources produces a stripped down gzip version of the resources.arsc from api jar.
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func PackResources() ([]byte, error) {
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tbl, err := OpenSDKTable()
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if err != nil {
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return nil, err
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}
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tbl.pool.strings = []string{} // should not be needed
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pkg := tbl.pkgs[0]
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// drop language string entries
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for _, typ := range pkg.specs[3].types {
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if typ.config.locale.language != 0 {
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for j, nt := range typ.entries {
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if nt == nil { // NoEntry
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continue
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}
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pkg.keyPool.strings[nt.key] = ""
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typ.indices[j] = NoEntry
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typ.entries[j] = nil
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}
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}
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}
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// drop strings from pool for specs to be dropped
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for _, spec := range pkg.specs[4:] {
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for _, typ := range spec.types {
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for _, nt := range typ.entries {
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if nt == nil { // NoEntry
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continue
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}
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// don't drop if there's a collision
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var collision bool
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for _, xspec := range pkg.specs[:4] {
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for _, xtyp := range xspec.types {
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for _, xnt := range xtyp.entries {
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if xnt == nil {
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continue
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}
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if collision = nt.key == xnt.key; collision {
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break
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}
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}
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}
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}
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if !collision {
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pkg.keyPool.strings[nt.key] = ""
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}
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}
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}
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}
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// entries are densely packed but probably safe to drop nil entries off the end
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for _, spec := range pkg.specs[:4] {
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for _, typ := range spec.types {
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var last int
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for i, nt := range typ.entries {
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if nt != nil {
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last = i
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}
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}
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typ.entries = typ.entries[:last+1]
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typ.indices = typ.indices[:last+1]
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}
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}
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// keeping 0:attr, 1:id, 2:style, 3:string
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pkg.typePool.strings = pkg.typePool.strings[:4]
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pkg.specs = pkg.specs[:4]
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bin, err := tbl.MarshalBinary()
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if err != nil {
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return nil, err
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}
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buf := new(bytes.Buffer)
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zw := gzip.NewWriter(buf)
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if _, err := zw.Write(bin); err != nil {
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return nil, err
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}
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if err := zw.Flush(); err != nil {
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return nil, err
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}
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if err := zw.Close(); err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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