/
table.go
772 lines (674 loc) · 20.1 KB
/
table.go
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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package binres
import (
"bytes"
"compress/gzip"
"errors"
"fmt"
"io"
"strings"
"unicode/utf16"
)
// NoEntry marks a key with no value in the table
const NoEntry = 0xFFFFFFFF
// TableRef uniquely identifies entries within a resource table.
type TableRef uint32
// Resolve returns the Entry of TableRef in the given table.
//
// A TableRef is structured as follows:
// 0xpptteeee
// pp: package index
// tt: type spec index in package
// eeee: entry index in type spec
//
// The package and type spec values start at 1 for the first item,
// to help catch cases where they have not been supplied.
func (ref TableRef) Resolve(tbl *Table) (*Entry, error) {
pkg := tbl.pkgs[uint8(ref>>24)-1]
spec := pkg.specs[uint8(ref>>16)-1]
idx := uint16(ref)
for _, typ := range spec.types {
if idx < uint16(len(typ.entries)) {
nt := typ.entries[idx]
if nt == nil {
return nil, errors.New("nil entry match")
}
return nt, nil
}
}
return nil, errors.New("failed to resolve table reference")
}
// Table is a container for packaged resources. Resource values within a package
// are obtained through pool while resource names and identifiers are obtained
// through each package's type and key pools respectively.
type Table struct {
chunkHeader
pool *Pool
pkgs []*Package
}
// NewMipmapTable returns a resource table initialized for a single xxxhdpi mipmap resource
// and the path to write resource data to.
func NewMipmapTable(pkgname string) (*Table, string) {
pkg := &Package{id: 127, name: pkgname, typePool: &Pool{}, keyPool: &Pool{}}
attr := pkg.typePool.ref("attr")
mipmap := pkg.typePool.ref("mipmap")
icon := pkg.keyPool.ref("icon")
nt := &Entry{values: []*Value{{data: &Data{Type: DataString}}}}
typ := &Type{id: 2, indices: []uint32{0}, entries: []*Entry{nt}}
typ.config.screenType.density = 640
typ.config.version.sdk = 4
pkg.specs = append(pkg.specs,
&TypeSpec{
id: uint8(attr) + 1, //1,
},
&TypeSpec{
id: uint8(mipmap) + 1, //2,
entryCount: 1,
entries: []uint32{uint32(icon)}, // {0}
types: []*Type{typ},
})
pkg.lastPublicType = uint32(len(pkg.typePool.strings)) // 2
pkg.lastPublicKey = uint32(len(pkg.keyPool.strings)) // 1
name := "res/mipmap-xxxhdpi-v4/icon.png"
tbl := &Table{pool: &Pool{}, pkgs: []*Package{pkg}}
tbl.pool.ref(name)
return tbl, name
}
// OpenSDKTable decodes resources.arsc from sdk platform jar.
func OpenSDKTable() (*Table, error) {
bin, err := apiResources()
if err != nil {
return nil, err
}
tbl := new(Table)
if err := tbl.UnmarshalBinary(bin); err != nil {
return nil, err
}
return tbl, nil
}
// OpenTable decodes the prepacked resources.arsc for the supported sdk platform.
func OpenTable() (*Table, error) {
zr, err := gzip.NewReader(bytes.NewReader(arsc))
if err != nil {
return nil, fmt.Errorf("gzip: %v", err)
}
defer zr.Close()
var buf bytes.Buffer
if _, err := io.Copy(&buf, zr); err != nil {
return nil, fmt.Errorf("io: %v", err)
}
tbl := new(Table)
if err := tbl.UnmarshalBinary(buf.Bytes()); err != nil {
return nil, err
}
return tbl, nil
}
// SpecByName parses the spec name from an entry string if necessary and returns
// the Package and TypeSpec associated with that name along with their respective
// indices.
//
// For example:
// tbl.SpecByName("@android:style/Theme.NoTitleBar")
// tbl.SpecByName("style")
// Both locate the spec by name "style".
func (tbl *Table) SpecByName(name string) (int, *Package, int, *TypeSpec, error) {
n := strings.TrimPrefix(name, "@android:")
n = strings.Split(n, "/")[0]
for pp, pkg := range tbl.pkgs {
for tt, spec := range pkg.specs {
if n == pkg.typePool.strings[spec.id-1] {
return pp, pkg, tt, spec, nil
}
}
}
return 0, nil, 0, nil, fmt.Errorf("spec by name not found: %q", name)
}
// RefByName returns the TableRef by a given name. The ref may be used to resolve the
// associated Entry and is used for the generation of binary manifest files.
func (tbl *Table) RefByName(name string) (TableRef, error) {
pp, pkg, tt, spec, err := tbl.SpecByName(name)
if err != nil {
return 0, err
}
q := strings.Split(name, "/")
if len(q) != 2 {
return 0, fmt.Errorf("invalid entry format, missing forward-slash: %q", name)
}
n := q[1]
for _, t := range spec.types {
for eeee, nt := range t.entries {
if nt == nil { // NoEntry
continue
}
if n == pkg.keyPool.strings[nt.key] {
return TableRef(uint32(eeee) | uint32(tt+1)<<16 | uint32(pp+1)<<24), nil
}
}
}
return 0, fmt.Errorf("failed to find table ref by %q", name)
}
// UnmarshalBinary creates the table from binary data
func (tbl *Table) UnmarshalBinary(bin []byte) error {
if err := (&tbl.chunkHeader).UnmarshalBinary(bin); err != nil {
return err
}
if tbl.typ != ResTable {
return fmt.Errorf("unexpected resource type %s, want %s", tbl.typ, ResTable)
}
npkgs := btou32(bin[8:])
tbl.pkgs = make([]*Package, npkgs)
buf := bin[tbl.headerByteSize:]
tbl.pool = new(Pool)
if err := tbl.pool.UnmarshalBinary(buf); err != nil {
return err
}
buf = buf[tbl.pool.size():]
for i := range tbl.pkgs {
pkg := new(Package)
if err := pkg.UnmarshalBinary(buf); err != nil {
return err
}
tbl.pkgs[i] = pkg
buf = buf[pkg.byteSize:]
}
return nil
}
// MarshalBinary outputs the binary format from a given table
func (tbl *Table) MarshalBinary() ([]byte, error) {
bin := make([]byte, 12)
putu16(bin, uint16(ResTable))
putu16(bin[2:], 12)
putu32(bin[8:], uint32(len(tbl.pkgs)))
if tbl.pool.IsUTF8() {
tbl.pool.flags ^= UTF8Flag
defer func() {
tbl.pool.flags |= UTF8Flag
}()
}
b, err := tbl.pool.MarshalBinary()
if err != nil {
return nil, err
}
bin = append(bin, b...)
for _, pkg := range tbl.pkgs {
b, err = pkg.MarshalBinary()
if err != nil {
return nil, err
}
bin = append(bin, b...)
}
putu32(bin[4:], uint32(len(bin)))
return bin, nil
}
// Package contains a collection of resource data types.
type Package struct {
chunkHeader
id uint32
name string
lastPublicType uint32 // last index into typePool that is for public use
lastPublicKey uint32 // last index into keyPool that is for public use
typePool *Pool // type names; e.g. theme
keyPool *Pool // resource names; e.g. Theme.NoTitleBar
specs []*TypeSpec
}
// UnmarshalBinary creates a pakage from binary data
func (pkg *Package) UnmarshalBinary(bin []byte) error {
if err := (&pkg.chunkHeader).UnmarshalBinary(bin); err != nil {
return err
}
if pkg.typ != ResTablePackage {
return errWrongType(pkg.typ, ResTablePackage)
}
pkg.id = btou32(bin[8:])
var name []uint16
for i := 0; i < 128; i++ {
x := btou16(bin[12+i*2:])
if x == 0 {
break
}
name = append(name, x)
}
pkg.name = string(utf16.Decode(name))
typeOffset := btou32(bin[268:]) // 0 if inheriting from another package
pkg.lastPublicType = btou32(bin[272:])
keyOffset := btou32(bin[276:]) // 0 if inheriting from another package
pkg.lastPublicKey = btou32(bin[280:])
var idOffset uint32 // value determined by either typePool or keyPool below
if typeOffset != 0 {
pkg.typePool = new(Pool)
if err := pkg.typePool.UnmarshalBinary(bin[typeOffset:]); err != nil {
return err
}
idOffset = typeOffset + pkg.typePool.byteSize
}
if keyOffset != 0 {
pkg.keyPool = new(Pool)
if err := pkg.keyPool.UnmarshalBinary(bin[keyOffset:]); err != nil {
return err
}
idOffset = keyOffset + pkg.keyPool.byteSize
}
if idOffset == 0 {
return nil
}
buf := bin[idOffset:]
for len(buf) > 0 {
t := ResType(btou16(buf))
switch t {
case ResTableTypeSpec:
spec := new(TypeSpec)
if err := spec.UnmarshalBinary(buf); err != nil {
return err
}
pkg.specs = append(pkg.specs, spec)
buf = buf[spec.byteSize:]
case ResTableType:
typ := new(Type)
if err := typ.UnmarshalBinary(buf); err != nil {
return err
}
last := pkg.specs[len(pkg.specs)-1]
last.types = append(last.types, typ)
buf = buf[typ.byteSize:]
default:
return errWrongType(t, ResTableTypeSpec, ResTableType)
}
}
return nil
}
// MarshalBinary outputs the binary format from a given package
func (pkg *Package) MarshalBinary() ([]byte, error) {
// Package header size is determined by C++ struct ResTable_package
// see frameworks/base/include/ResourceTypes.h
bin := make([]byte, 288)
putu16(bin, uint16(ResTablePackage))
putu16(bin[2:], 288)
putu32(bin[8:], pkg.id)
p := utf16.Encode([]rune(pkg.name))
for i, x := range p {
putu16(bin[12+i*2:], x)
}
if pkg.typePool != nil {
if pkg.typePool.IsUTF8() {
pkg.typePool.flags ^= UTF8Flag
defer func() {
pkg.typePool.flags |= UTF8Flag
}()
}
b, err := pkg.typePool.MarshalBinary()
if err != nil {
return nil, err
}
putu32(bin[268:], uint32(len(bin)))
putu32(bin[272:], pkg.lastPublicType)
bin = append(bin, b...)
}
if pkg.keyPool != nil {
if pkg.keyPool.IsUTF8() {
pkg.keyPool.flags ^= UTF8Flag
defer func() {
pkg.keyPool.flags |= UTF8Flag
}()
}
b, err := pkg.keyPool.MarshalBinary()
if err != nil {
return nil, err
}
putu32(bin[276:], uint32(len(bin)))
putu32(bin[280:], pkg.lastPublicKey)
bin = append(bin, b...)
}
for _, spec := range pkg.specs {
b, err := spec.MarshalBinary()
if err != nil {
return nil, err
}
bin = append(bin, b...)
}
putu32(bin[4:], uint32(len(bin)))
return bin, nil
}
// TypeSpec provides a specification for the resources defined by a particular type.
type TypeSpec struct {
chunkHeader
id uint8 // id-1 is name index in Package.typePool
res0 uint8 // must be 0
res1 uint16 // must be 0
entryCount uint32 // number of uint32 entry configuration masks that follow
entries []uint32 // entry configuration masks
types []*Type
}
// UnmarshalBinary creates the type spec from binary data
func (spec *TypeSpec) UnmarshalBinary(bin []byte) error {
if err := (&spec.chunkHeader).UnmarshalBinary(bin); err != nil {
return err
}
if spec.typ != ResTableTypeSpec {
return errWrongType(spec.typ, ResTableTypeSpec)
}
spec.id = bin[8]
spec.res0 = bin[9]
spec.res1 = btou16(bin[10:])
spec.entryCount = btou32(bin[12:])
spec.entries = make([]uint32, spec.entryCount)
for i := range spec.entries {
spec.entries[i] = btou32(bin[16+i*4:])
}
return nil
}
// MarshalBinary outputs the binary format from a given type spec
func (spec *TypeSpec) MarshalBinary() ([]byte, error) {
bin := make([]byte, 16+len(spec.entries)*4)
putu16(bin, uint16(ResTableTypeSpec))
putu16(bin[2:], 16)
putu32(bin[4:], uint32(len(bin)))
bin[8] = spec.id
// [9] = 0
// [10:12] = 0
putu32(bin[12:], uint32(len(spec.entries)))
for i, x := range spec.entries {
putu32(bin[16+i*4:], x)
}
for _, typ := range spec.types {
b, err := typ.MarshalBinary()
if err != nil {
return nil, err
}
bin = append(bin, b...)
}
return bin, nil
}
// Type provides a collection of entries for a specific device configuration.
type Type struct {
chunkHeader
id uint8
res0 uint8 // must be 0
res1 uint16 // must be 0
entryCount uint32 // number of uint32 entry configuration masks that follow
entriesStart uint32 // offset from header where Entry data starts
// configuration this collection of entries is designed for
config struct {
size uint32
imsi struct {
mcc uint16 // mobile country code
mnc uint16 // mobile network code
}
locale struct {
language uint16
country uint16
}
screenType struct {
orientation uint8
touchscreen uint8
density uint16
}
input struct {
keyboard uint8
navigation uint8
inputFlags uint8
inputPad0 uint8
}
screenSize struct {
width uint16
height uint16
}
version struct {
sdk uint16
minor uint16 // always 0
}
screenConfig struct {
layout uint8
uiMode uint8
smallestWidthDP uint16
}
screenSizeDP struct {
width uint16
height uint16
}
}
indices []uint32 // values that map to typePool
entries []*Entry
}
// UnmarshalBinary creates the type from binary data
func (typ *Type) UnmarshalBinary(bin []byte) error {
if err := (&typ.chunkHeader).UnmarshalBinary(bin); err != nil {
return err
}
if typ.typ != ResTableType {
return errWrongType(typ.typ, ResTableType)
}
typ.id = bin[8]
typ.res0 = bin[9]
typ.res1 = btou16(bin[10:])
typ.entryCount = btou32(bin[12:])
typ.entriesStart = btou32(bin[16:])
if typ.res0 != 0 || typ.res1 != 0 {
return fmt.Errorf("res0 res1 not zero")
}
typ.config.size = btou32(bin[20:])
typ.config.imsi.mcc = btou16(bin[24:])
typ.config.imsi.mnc = btou16(bin[26:])
typ.config.locale.language = btou16(bin[28:])
typ.config.locale.country = btou16(bin[30:])
typ.config.screenType.orientation = bin[32]
typ.config.screenType.touchscreen = bin[33]
typ.config.screenType.density = btou16(bin[34:])
typ.config.input.keyboard = bin[36]
typ.config.input.navigation = bin[37]
typ.config.input.inputFlags = bin[38]
typ.config.input.inputPad0 = bin[39]
typ.config.screenSize.width = btou16(bin[40:])
typ.config.screenSize.height = btou16(bin[42:])
typ.config.version.sdk = btou16(bin[44:])
typ.config.version.minor = btou16(bin[46:])
typ.config.screenConfig.layout = bin[48]
typ.config.screenConfig.uiMode = bin[49]
typ.config.screenConfig.smallestWidthDP = btou16(bin[50:])
typ.config.screenSizeDP.width = btou16(bin[52:])
typ.config.screenSizeDP.height = btou16(bin[54:])
// fmt.Println("language/country:", u16tos(typ.config.locale.language), u16tos(typ.config.locale.country))
buf := bin[typ.headerByteSize:typ.entriesStart]
for len(buf) > 0 {
typ.indices = append(typ.indices, btou32(buf))
buf = buf[4:]
}
if len(typ.indices) != int(typ.entryCount) {
return fmt.Errorf("indices len[%v] doesn't match entryCount[%v]", len(typ.indices), typ.entryCount)
}
typ.entries = make([]*Entry, typ.entryCount)
for i, x := range typ.indices {
if x == NoEntry {
continue
}
nt := &Entry{}
if err := nt.UnmarshalBinary(bin[typ.entriesStart+x:]); err != nil {
return err
}
typ.entries[i] = nt
}
return nil
}
// MarshalBinary outputs the binary format from a given type
func (typ *Type) MarshalBinary() ([]byte, error) {
bin := make([]byte, 56+len(typ.entries)*4)
putu16(bin, uint16(ResTableType))
putu16(bin[2:], 56)
bin[8] = typ.id
// [9] = 0
// [10:12] = 0
putu32(bin[12:], uint32(len(typ.entries)))
putu32(bin[16:], uint32(56+len(typ.entries)*4))
// assure typ.config.size is always written as 52; extended configuration beyond supported
// API level is not supported by this marshal implementation but will be forward-compatible.
putu32(bin[20:], 52)
putu16(bin[24:], typ.config.imsi.mcc)
putu16(bin[26:], typ.config.imsi.mnc)
putu16(bin[28:], typ.config.locale.language)
putu16(bin[30:], typ.config.locale.country)
bin[32] = typ.config.screenType.orientation
bin[33] = typ.config.screenType.touchscreen
putu16(bin[34:], typ.config.screenType.density)
bin[36] = typ.config.input.keyboard
bin[37] = typ.config.input.navigation
bin[38] = typ.config.input.inputFlags
bin[39] = typ.config.input.inputPad0
putu16(bin[40:], typ.config.screenSize.width)
putu16(bin[42:], typ.config.screenSize.height)
putu16(bin[44:], typ.config.version.sdk)
putu16(bin[46:], typ.config.version.minor)
bin[48] = typ.config.screenConfig.layout
bin[49] = typ.config.screenConfig.uiMode
putu16(bin[50:], typ.config.screenConfig.smallestWidthDP)
putu16(bin[52:], typ.config.screenSizeDP.width)
putu16(bin[54:], typ.config.screenSizeDP.height)
var ntbin []byte
for i, nt := range typ.entries {
if nt == nil { // NoEntry
putu32(bin[56+i*4:], NoEntry)
continue
}
putu32(bin[56+i*4:], uint32(len(ntbin)))
b, err := nt.MarshalBinary()
if err != nil {
return nil, err
}
ntbin = append(ntbin, b...)
}
bin = append(bin, ntbin...)
putu32(bin[4:], uint32(len(bin)))
return bin, nil
}
// Entry is a resource key typically followed by a value or resource map.
type Entry struct {
size uint16
flags uint16
key PoolRef // ref into key pool
// only filled if this is a map entry; when size is 16
parent TableRef // id of parent mapping or zero if none
count uint32 // name and value pairs that follow for FlagComplex
values []*Value
}
// UnmarshalBinary creates an entry from binary data
func (nt *Entry) UnmarshalBinary(bin []byte) error {
nt.size = btou16(bin)
nt.flags = btou16(bin[2:])
nt.key = PoolRef(btou32(bin[4:]))
if nt.size == 16 {
nt.parent = TableRef(btou32(bin[8:]))
nt.count = btou32(bin[12:])
nt.values = make([]*Value, nt.count)
for i := range nt.values {
val := &Value{}
if err := val.UnmarshalBinary(bin[16+i*12:]); err != nil {
return err
}
nt.values[i] = val
}
} else {
data := &Data{}
if err := data.UnmarshalBinary(bin[8:]); err != nil {
return err
}
// TODO boxing data not strictly correct as binary repr isn't of Value.
nt.values = append(nt.values, &Value{0, data})
}
return nil
}
// MarshalBinary outputs the binary format from a given entry
func (nt *Entry) MarshalBinary() ([]byte, error) {
bin := make([]byte, 8)
sz := nt.size
if sz == 0 {
sz = 8
}
putu16(bin, sz)
putu16(bin[2:], nt.flags)
putu32(bin[4:], uint32(nt.key))
if sz == 16 {
bin = append(bin, make([]byte, 8+len(nt.values)*12)...)
putu32(bin[8:], uint32(nt.parent))
putu32(bin[12:], uint32(len(nt.values)))
for i, val := range nt.values {
b, err := val.MarshalBinary()
if err != nil {
return nil, err
}
copy(bin[16+i*12:], b)
}
} else {
b, err := nt.values[0].data.MarshalBinary()
if err != nil {
return nil, err
}
bin = append(bin, b...)
}
return bin, nil
}
// Value is resource value associated with a key
type Value struct {
name TableRef
data *Data
}
// UnmarshalBinary creates the pool from binary data
func (val *Value) UnmarshalBinary(bin []byte) error {
val.name = TableRef(btou32(bin))
val.data = &Data{}
return val.data.UnmarshalBinary(bin[4:])
}
// MarshalBinary outputs the binary format from a given value
func (val *Value) MarshalBinary() ([]byte, error) {
bin := make([]byte, 12)
putu32(bin, uint32(val.name))
b, err := val.data.MarshalBinary()
if err != nil {
return nil, err
}
copy(bin[4:], b)
return bin, nil
}
// DataType marks the type of a data item in a value
type DataType uint8
// explicitly defined for clarity and resolvability with apt source
const (
DataNull DataType = 0x00 // either 0 or 1 for resource undefined or empty
DataReference DataType = 0x01 // ResTable_ref, a reference to another resource table entry
DataAttribute DataType = 0x02 // attribute resource identifier
DataString DataType = 0x03 // index into the containing resource table's global value string pool
DataFloat DataType = 0x04 // single-precision floating point number
DataDimension DataType = 0x05 // complex number encoding a dimension value, such as "100in"
DataFraction DataType = 0x06 // complex number encoding a fraction of a container
DataDynamicReference DataType = 0x07 // dynamic ResTable_ref, which needs to be resolved before it can be used like a TYPE_REFERENCE.
DataIntDec DataType = 0x10 // raw integer value of the form n..n
DataIntHex DataType = 0x11 // raw integer value of the form 0xn..n
DataIntBool DataType = 0x12 // either 0 or 1, for input "false" or "true"
DataIntColorARGB8 DataType = 0x1c // raw integer value of the form #aarrggbb
DataIntColorRGB8 DataType = 0x1d // raw integer value of the form #rrggbb
DataIntColorARGB4 DataType = 0x1e // raw integer value of the form #argb
DataIntColorRGB4 DataType = 0x1f // raw integer value of the form #rgb
)
// Data is the raw data stored in a value
type Data struct {
ByteSize uint16
Res0 uint8 // always 0, useful for debugging bad read offsets
Type DataType
Value uint32
}
// UnmarshalBinary creates the data item from binary data
func (d *Data) UnmarshalBinary(bin []byte) error {
d.ByteSize = btou16(bin)
d.Res0 = bin[2]
d.Type = DataType(bin[3])
d.Value = btou32(bin[4:])
return nil
}
// MarshalBinary outputs the binary format from a given data item
func (d *Data) MarshalBinary() ([]byte, error) {
bin := make([]byte, 8)
putu16(bin, 8)
bin[2] = d.Res0
bin[3] = byte(d.Type)
putu32(bin[4:], d.Value)
return bin, nil
}