BinaryResourceParser.cpp revision 9e10ac70155c993e7053323ad36beaea7bf7d54f 
1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "ResourceTable.h"
18#include "ResourceUtils.h"
19#include "ResourceValues.h"
20#include "Source.h"
21#include "ValueVisitor.h"
22
23#include "flatten/ResourceTypeExtensions.h"
24#include "unflatten/BinaryResourceParser.h"
25#include "unflatten/ResChunkPullParser.h"
26#include "util/Util.h"
27
28#include <androidfw/ResourceTypes.h>
29#include <androidfw/TypeWrappers.h>
30#include <base/macros.h>
31
32#include <map>
33#include <string>
34
35namespace aapt {
36
37using namespace android;
38
39/*
40 * Visitor that converts a reference's resource ID to a resource name,
41 * given a mapping from resource ID to resource name.
42 */
43class ReferenceIdToNameVisitor : public ValueVisitor {
44private:
45    const std::map<ResourceId, ResourceName>* mMapping;
46
47public:
48    using ValueVisitor::visit;
49
50    ReferenceIdToNameVisitor(const std::map<ResourceId, ResourceName>* mapping) :
51            mMapping(mapping) {
52        assert(mMapping);
53    }
54
55    void visit(Reference* reference) override {
56        if (!reference->id || !reference->id.value().isValid()) {
57            return;
58        }
59
60        ResourceId id = reference->id.value();
61        auto cacheIter = mMapping->find(id);
62        if (cacheIter != mMapping->end()) {
63            reference->name = cacheIter->second;
64            reference->id = {};
65        }
66    }
67};
68
69BinaryResourceParser::BinaryResourceParser(IAaptContext* context, ResourceTable* table,
70                                           const Source& source, const void* data, size_t len) :
71        mContext(context), mTable(table), mSource(source), mData(data), mDataLen(len) {
72}
73
74bool BinaryResourceParser::parse() {
75    ResChunkPullParser parser(mData, mDataLen);
76
77    bool error = false;
78    while(ResChunkPullParser::isGoodEvent(parser.next())) {
79        if (parser.getChunk()->type != android::RES_TABLE_TYPE) {
80            mContext->getDiagnostics()->warn(DiagMessage(mSource)
81                                             << "unknown chunk of type '"
82                                             << (int) parser.getChunk()->type << "'");
83            continue;
84        }
85
86        if (!parseTable(parser.getChunk())) {
87            error = true;
88        }
89    }
90
91    if (parser.getEvent() == ResChunkPullParser::Event::BadDocument) {
92        mContext->getDiagnostics()->error(DiagMessage(mSource)
93                                          << "corrupt resource table: "
94                                          << parser.getLastError());
95        return false;
96    }
97    return !error;
98}
99
100bool BinaryResourceParser::getSymbol(const void* data, ResourceNameRef* outSymbol) {
101    if (!mSymbolEntries || mSymbolEntryCount == 0) {
102        return false;
103    }
104
105    if ((uintptr_t) data < (uintptr_t) mData) {
106        return false;
107    }
108
109    // We only support 32 bit offsets right now.
110    const uintptr_t offset = (uintptr_t) data - (uintptr_t) mData;
111    if (offset > std::numeric_limits<uint32_t>::max()) {
112        return false;
113    }
114
115    for (size_t i = 0; i < mSymbolEntryCount; i++) {
116        if (util::deviceToHost32(mSymbolEntries[i].offset) == offset) {
117            // This offset is a symbol!
118            const StringPiece16 str = util::getString(
119                    mSymbolPool, util::deviceToHost32(mSymbolEntries[i].stringIndex));
120
121            StringPiece16 typeStr;
122            ResourceUtils::extractResourceName(str, &outSymbol->package, &typeStr,
123                                               &outSymbol->entry);
124            const ResourceType* type = parseResourceType(typeStr);
125            if (!type) {
126                return false;
127            }
128
129            outSymbol->type = *type;
130
131            // Since we scan the symbol table in order, we can start looking for the
132            // next symbol from this point.
133            mSymbolEntryCount -= i + 1;
134            mSymbolEntries += i + 1;
135            return true;
136        }
137    }
138    return false;
139}
140
141/**
142 * Parses the SymbolTable_header, which is present on non-final resource tables
143 * after the compile phase.
144 *
145 * | SymbolTable_header |
146 * |--------------------|
147 * |SymbolTable_entry 0 |
148 * |SymbolTable_entry 1 |
149 * | ...                |
150 * |SymbolTable_entry n |
151 * |--------------------|
152 *
153 */
154bool BinaryResourceParser::parseSymbolTable(const ResChunk_header* chunk) {
155    const SymbolTable_header* header = convertTo<SymbolTable_header>(chunk);
156    if (!header) {
157        mContext->getDiagnostics()->error(DiagMessage(mSource)
158                                          << "corrupt SymbolTable_header");
159        return false;
160    }
161
162    const uint32_t entrySizeBytes =
163            util::deviceToHost32(header->count) * sizeof(SymbolTable_entry);
164    if (entrySizeBytes > getChunkDataLen(&header->header)) {
165        mContext->getDiagnostics()->error(DiagMessage(mSource)
166                                          << "SymbolTable_header data section too long");
167        return false;
168    }
169
170    mSymbolEntries = (const SymbolTable_entry*) getChunkData(&header->header);
171    mSymbolEntryCount = util::deviceToHost32(header->count);
172
173    // Skip over the symbol entries and parse the StringPool chunk that should be next.
174    ResChunkPullParser parser(getChunkData(&header->header) + entrySizeBytes,
175                              getChunkDataLen(&header->header) - entrySizeBytes);
176    if (!ResChunkPullParser::isGoodEvent(parser.next())) {
177        mContext->getDiagnostics()->error(DiagMessage(mSource)
178                                          << "failed to parse chunk in SymbolTable: "
179                                          << parser.getLastError());
180        return false;
181    }
182
183    const ResChunk_header* nextChunk = parser.getChunk();
184    if (util::deviceToHost16(nextChunk->type) != android::RES_STRING_POOL_TYPE) {
185        mContext->getDiagnostics()->error(DiagMessage(mSource)
186                                          << "expected string pool in SymbolTable but got "
187                                          << "chunk of type "
188                                          << (int) util::deviceToHost16(nextChunk->type));
189        return false;
190    }
191
192    if (mSymbolPool.setTo(nextChunk, util::deviceToHost32(nextChunk->size)) != NO_ERROR) {
193        mContext->getDiagnostics()->error(DiagMessage(mSource)
194                                          << "corrupt string pool in SymbolTable: "
195                                          << mSymbolPool.getError());
196        return false;
197    }
198    return true;
199}
200
201/**
202 * Parses the resource table, which contains all the packages, types, and entries.
203 */
204bool BinaryResourceParser::parseTable(const ResChunk_header* chunk) {
205    const ResTable_header* tableHeader = convertTo<ResTable_header>(chunk);
206    if (!tableHeader) {
207        mContext->getDiagnostics()->error(DiagMessage(mSource) << "corrupt ResTable_header chunk");
208        return false;
209    }
210
211    ResChunkPullParser parser(getChunkData(&tableHeader->header),
212                              getChunkDataLen(&tableHeader->header));
213    while (ResChunkPullParser::isGoodEvent(parser.next())) {
214        switch (util::deviceToHost16(parser.getChunk()->type)) {
215        case android::RES_STRING_POOL_TYPE:
216            if (mValuePool.getError() == NO_INIT) {
217                status_t err = mValuePool.setTo(parser.getChunk(),
218                                                util::deviceToHost32(parser.getChunk()->size));
219                if (err != NO_ERROR) {
220                    mContext->getDiagnostics()->error(DiagMessage(mSource)
221                                                      << "corrupt string pool in ResTable: "
222                                                      << mValuePool.getError());
223                    return false;
224                }
225
226                // Reserve some space for the strings we are going to add.
227                mTable->stringPool.hintWillAdd(mValuePool.size(), mValuePool.styleCount());
228            } else {
229                mContext->getDiagnostics()->warn(DiagMessage(mSource)
230                                                 << "unexpected string pool in ResTable");
231            }
232            break;
233
234        case RES_TABLE_SYMBOL_TABLE_TYPE:
235            if (!parseSymbolTable(parser.getChunk())) {
236                return false;
237            }
238            break;
239
240        case RES_TABLE_SOURCE_POOL_TYPE: {
241            status_t err = mSourcePool.setTo(getChunkData(parser.getChunk()),
242                                             getChunkDataLen(parser.getChunk()));
243            if (err != NO_ERROR) {
244                mContext->getDiagnostics()->error(DiagMessage(mSource)
245                                                  << "corrupt source string pool in ResTable: "
246                                                  << mSourcePool.getError());
247                return false;
248            }
249            break;
250        }
251
252        case android::RES_TABLE_PACKAGE_TYPE:
253            if (!parsePackage(parser.getChunk())) {
254                return false;
255            }
256            break;
257
258        default:
259            mContext->getDiagnostics()
260                    ->warn(DiagMessage(mSource)
261                           << "unexpected chunk type "
262                           << (int) util::deviceToHost16(parser.getChunk()->type));
263            break;
264        }
265    }
266
267    if (parser.getEvent() == ResChunkPullParser::Event::BadDocument) {
268        mContext->getDiagnostics()->error(DiagMessage(mSource)
269                                          << "corrupt resource table: " << parser.getLastError());
270        return false;
271    }
272    return true;
273}
274
275
276bool BinaryResourceParser::parsePackage(const ResChunk_header* chunk) {
277    const ResTable_package* packageHeader = convertTo<ResTable_package>(chunk);
278    if (!packageHeader) {
279        mContext->getDiagnostics()->error(DiagMessage(mSource)
280                                          << "corrupt ResTable_package chunk");
281        return false;
282    }
283
284    uint32_t packageId = util::deviceToHost32(packageHeader->id);
285    if (packageId > std::numeric_limits<uint8_t>::max()) {
286        mContext->getDiagnostics()->error(DiagMessage(mSource)
287                                          << "package ID is too big (" << packageId << ")");
288        return false;
289    }
290
291    // Extract the package name.
292    size_t len = strnlen16((const char16_t*) packageHeader->name, arraysize(packageHeader->name));
293    std::u16string packageName;
294    packageName.resize(len);
295    for (size_t i = 0; i < len; i++) {
296        packageName[i] = util::deviceToHost16(packageHeader->name[i]);
297    }
298
299    ResourceTablePackage* package = mTable->createPackage(packageName, (uint8_t) packageId);
300    if (!package) {
301        mContext->getDiagnostics()->error(DiagMessage(mSource)
302                                          << "incompatible package '" << packageName
303                                          << "' with ID " << packageId);
304        return false;
305    }
306
307    ResChunkPullParser parser(getChunkData(&packageHeader->header),
308                              getChunkDataLen(&packageHeader->header));
309    while (ResChunkPullParser::isGoodEvent(parser.next())) {
310        switch (util::deviceToHost16(parser.getChunk()->type)) {
311        case android::RES_STRING_POOL_TYPE:
312            if (mTypePool.getError() == NO_INIT) {
313                status_t err = mTypePool.setTo(parser.getChunk(),
314                                               util::deviceToHost32(parser.getChunk()->size));
315                if (err != NO_ERROR) {
316                    mContext->getDiagnostics()->error(DiagMessage(mSource)
317                                                      << "corrupt type string pool in "
318                                                      << "ResTable_package: "
319                                                      << mTypePool.getError());
320                    return false;
321                }
322            } else if (mKeyPool.getError() == NO_INIT) {
323                status_t err = mKeyPool.setTo(parser.getChunk(),
324                                              util::deviceToHost32(parser.getChunk()->size));
325                if (err != NO_ERROR) {
326                    mContext->getDiagnostics()->error(DiagMessage(mSource)
327                                                      << "corrupt key string pool in "
328                                                      << "ResTable_package: "
329                                                      << mKeyPool.getError());
330                    return false;
331                }
332            } else {
333                mContext->getDiagnostics()->warn(DiagMessage(mSource) << "unexpected string pool");
334            }
335            break;
336
337        case android::RES_TABLE_TYPE_SPEC_TYPE:
338            if (!parseTypeSpec(parser.getChunk())) {
339                return false;
340            }
341            break;
342
343        case android::RES_TABLE_TYPE_TYPE:
344            if (!parseType(package, parser.getChunk())) {
345                return false;
346            }
347            break;
348
349        case RES_TABLE_PUBLIC_TYPE:
350            if (!parsePublic(package, parser.getChunk())) {
351                return false;
352            }
353            break;
354
355        default:
356            mContext->getDiagnostics()
357                    ->warn(DiagMessage(mSource)
358                           << "unexpected chunk type "
359                           << (int) util::deviceToHost16(parser.getChunk()->type));
360            break;
361        }
362    }
363
364    if (parser.getEvent() == ResChunkPullParser::Event::BadDocument) {
365        mContext->getDiagnostics()->error(DiagMessage(mSource)
366                                          << "corrupt ResTable_package: "
367                                          << parser.getLastError());
368        return false;
369    }
370
371    // Now go through the table and change local resource ID references to
372    // symbolic references.
373    ReferenceIdToNameVisitor visitor(&mIdIndex);
374    for (auto& package : mTable->packages) {
375        for (auto& type : package->types) {
376            for (auto& entry : type->entries) {
377                for (auto& configValue : entry->values) {
378                    configValue.value->accept(&visitor);
379                }
380            }
381        }
382    }
383    return true;
384}
385
386bool BinaryResourceParser::parsePublic(const ResourceTablePackage* package,
387                                       const ResChunk_header* chunk) {
388    const Public_header* header = convertTo<Public_header>(chunk);
389    if (!header) {
390        mContext->getDiagnostics()->error(DiagMessage(mSource)
391                                          << "corrupt Public_header chunk");
392        return false;
393    }
394
395    if (header->typeId == 0) {
396        mContext->getDiagnostics()->error(DiagMessage(mSource)
397                                          << "invalid type ID "
398                                          << (int) header->typeId);
399        return false;
400    }
401
402    StringPiece16 typeStr16 = util::getString(mTypePool, header->typeId - 1);
403    const ResourceType* parsedType = parseResourceType(typeStr16);
404    if (!parsedType) {
405        mContext->getDiagnostics()->error(DiagMessage(mSource)
406                                          << "invalid type '" << typeStr16 << "'");
407        return false;
408    }
409
410    const uintptr_t chunkEnd = (uintptr_t) chunk + util::deviceToHost32(chunk->size);
411    const Public_entry* entry = (const Public_entry*) getChunkData(&header->header);
412    for (uint32_t i = 0; i < util::deviceToHost32(header->count); i++) {
413        if ((uintptr_t) entry + sizeof(*entry) > chunkEnd) {
414            mContext->getDiagnostics()->error(DiagMessage(mSource)
415                                              << "Public_entry data section is too long");
416            return false;
417        }
418
419        const ResourceId resId(package->id.value(), header->typeId,
420                               util::deviceToHost16(entry->entryId));
421
422        const ResourceName name(package->name, *parsedType,
423                                util::getString(mKeyPool, entry->key.index).toString());
424
425        Source source;
426        if (mSourcePool.getError() == NO_ERROR) {
427            source.path = util::utf16ToUtf8(util::getString(
428                    mSourcePool, util::deviceToHost32(entry->source.index)));
429            source.line = util::deviceToHost32(entry->sourceLine);
430        }
431
432        SymbolState state = SymbolState::kUndefined;
433        switch (util::deviceToHost16(entry->state)) {
434        case Public_entry::kPrivate:
435            state = SymbolState::kPrivate;
436            break;
437
438        case Public_entry::kPublic:
439            state = SymbolState::kPublic;
440            break;
441        }
442
443        if (!mTable->setSymbolStateAllowMangled(name, resId, source, state,
444                                                mContext->getDiagnostics())) {
445            return false;
446        }
447
448        // Add this resource name->id mapping to the index so
449        // that we can resolve all ID references to name references.
450        auto cacheIter = mIdIndex.find(resId);
451        if (cacheIter == mIdIndex.end()) {
452            mIdIndex.insert({ resId, name });
453        }
454
455        entry++;
456    }
457    return true;
458}
459
460bool BinaryResourceParser::parseTypeSpec(const ResChunk_header* chunk) {
461    if (mTypePool.getError() != NO_ERROR) {
462        mContext->getDiagnostics()->error(DiagMessage(mSource)
463                                          << "missing type string pool");
464        return false;
465    }
466
467    const ResTable_typeSpec* typeSpec = convertTo<ResTable_typeSpec>(chunk);
468    if (!typeSpec) {
469        mContext->getDiagnostics()->error(DiagMessage(mSource)
470                                          << "corrupt ResTable_typeSpec chunk");
471        return false;
472    }
473
474    if (typeSpec->id == 0) {
475        mContext->getDiagnostics()->error(DiagMessage(mSource)
476                                          << "ResTable_typeSpec has invalid id: " << typeSpec->id);
477        return false;
478    }
479    return true;
480}
481
482bool BinaryResourceParser::parseType(const ResourceTablePackage* package,
483                                     const ResChunk_header* chunk) {
484    if (mTypePool.getError() != NO_ERROR) {
485        mContext->getDiagnostics()->error(DiagMessage(mSource)
486                                          << "missing type string pool");
487        return false;
488    }
489
490    if (mKeyPool.getError() != NO_ERROR) {
491        mContext->getDiagnostics()->error(DiagMessage(mSource)
492                                          << "missing key string pool");
493        return false;
494    }
495
496    const ResTable_type* type = convertTo<ResTable_type>(chunk);
497    if (!type) {
498        mContext->getDiagnostics()->error(DiagMessage(mSource)
499                                          << "corrupt ResTable_type chunk");
500        return false;
501    }
502
503    if (type->id == 0) {
504        mContext->getDiagnostics()->error(DiagMessage(mSource)
505                                          << "ResTable_type has invalid id: " << (int) type->id);
506        return false;
507    }
508
509    ConfigDescription config;
510    config.copyFromDtoH(type->config);
511
512    StringPiece16 typeStr16 = util::getString(mTypePool, type->id - 1);
513
514    const ResourceType* parsedType = parseResourceType(typeStr16);
515    if (!parsedType) {
516        mContext->getDiagnostics()->error(DiagMessage(mSource)
517                                          << "invalid type name '" << typeStr16
518                                          << "' for type with ID " << (int) type->id);
519        return false;
520    }
521
522    TypeVariant tv(type);
523    for (auto it = tv.beginEntries(); it != tv.endEntries(); ++it) {
524        const ResTable_entry* entry = *it;
525        if (!entry) {
526            continue;
527        }
528
529        const ResourceName name(package->name, *parsedType,
530                                util::getString(mKeyPool,
531                                                util::deviceToHost32(entry->key.index)).toString());
532
533        const ResourceId resId(package->id.value(), type->id, static_cast<uint16_t>(it.index()));
534
535        std::unique_ptr<Value> resourceValue;
536        const ResTable_entry_source* sourceBlock = nullptr;
537
538        if (entry->flags & ResTable_entry::FLAG_COMPLEX) {
539            const ResTable_map_entry* mapEntry = static_cast<const ResTable_map_entry*>(entry);
540            if (util::deviceToHost32(mapEntry->size) - sizeof(*mapEntry) == sizeof(*sourceBlock)) {
541                const uint8_t* data = (const uint8_t*) mapEntry;
542                data += util::deviceToHost32(mapEntry->size) - sizeof(*sourceBlock);
543                sourceBlock = (const ResTable_entry_source*) data;
544            }
545
546            // TODO(adamlesinski): Check that the entry count is valid.
547            resourceValue = parseMapEntry(name, config, mapEntry);
548        } else {
549            if (util::deviceToHost32(entry->size) - sizeof(*entry) == sizeof(*sourceBlock)) {
550                const uint8_t* data = (const uint8_t*) entry;
551                data += util::deviceToHost32(entry->size) - sizeof(*sourceBlock);
552                sourceBlock = (const ResTable_entry_source*) data;
553            }
554
555            const Res_value* value = (const Res_value*)(
556                    (const uint8_t*) entry + util::deviceToHost32(entry->size));
557            resourceValue = parseValue(name, config, value, entry->flags);
558        }
559
560        assert(resourceValue && "failed to interpret valid resource");
561
562        Source source = mSource;
563        if (sourceBlock) {
564            size_t len;
565            const char* str = mSourcePool.string8At(util::deviceToHost32(sourceBlock->pathIndex),
566                                                    &len);
567            if (str) {
568                source.path.assign(str, len);
569            }
570            source.line = util::deviceToHost32(sourceBlock->line);
571        }
572
573        if (!mTable->addResourceAllowMangled(name, config, source, std::move(resourceValue),
574                                             mContext->getDiagnostics())) {
575            return false;
576        }
577
578        if ((entry->flags & ResTable_entry::FLAG_PUBLIC) != 0) {
579            if (!mTable->setSymbolStateAllowMangled(name, resId, mSource.withLine(0),
580                                                    SymbolState::kPublic,
581                                                    mContext->getDiagnostics())) {
582                return false;
583            }
584        }
585
586        // Add this resource name->id mapping to the index so
587        // that we can resolve all ID references to name references.
588        auto cacheIter = mIdIndex.find(resId);
589        if (cacheIter == mIdIndex.end()) {
590            mIdIndex.insert({ resId, name });
591        }
592    }
593    return true;
594}
595
596std::unique_ptr<Item> BinaryResourceParser::parseValue(const ResourceNameRef& name,
597                                                       const ConfigDescription& config,
598                                                       const Res_value* value,
599                                                       uint16_t flags) {
600    if (name.type == ResourceType::kId) {
601        return util::make_unique<Id>();
602    }
603
604    const uint32_t data = util::deviceToHost32(value->data);
605
606    if (value->dataType == Res_value::TYPE_STRING) {
607        StringPiece16 str = util::getString(mValuePool, data);
608
609        const ResStringPool_span* spans = mValuePool.styleAt(data);
610
611        // Check if the string has a valid style associated with it.
612        if (spans != nullptr && spans->name.index != ResStringPool_span::END) {
613            StyleString styleStr = { str.toString() };
614            while (spans->name.index != ResStringPool_span::END) {
615                styleStr.spans.push_back(Span{
616                        util::getString(mValuePool, spans->name.index).toString(),
617                        spans->firstChar,
618                        spans->lastChar
619                });
620                spans++;
621            }
622            return util::make_unique<StyledString>(mTable->stringPool.makeRef(
623                    styleStr, StringPool::Context{1, config}));
624        } else {
625            if (name.type != ResourceType::kString &&
626                    util::stringStartsWith<char16_t>(str, u"res/")) {
627                // This must be a FileReference.
628                return util::make_unique<FileReference>(mTable->stringPool.makeRef(
629                            str, StringPool::Context{ 0, config }));
630            }
631
632            // There are no styles associated with this string, so treat it as
633            // a simple string.
634            return util::make_unique<String>(mTable->stringPool.makeRef(
635                    str, StringPool::Context{1, config}));
636        }
637    }
638
639    if (value->dataType == Res_value::TYPE_REFERENCE ||
640            value->dataType == Res_value::TYPE_ATTRIBUTE) {
641        const Reference::Type type = (value->dataType == Res_value::TYPE_REFERENCE) ?
642                    Reference::Type::kResource : Reference::Type::kAttribute;
643
644        if (data != 0) {
645            // This is a normal reference.
646            return util::make_unique<Reference>(data, type);
647        }
648
649        // This reference has an invalid ID. Check if it is an unresolved symbol.
650        ResourceNameRef symbol;
651        if (getSymbol(&value->data, &symbol)) {
652            return util::make_unique<Reference>(symbol, type);
653        }
654
655        // This is not an unresolved symbol, so it must be the magic @null reference.
656        Res_value nullType = {};
657        nullType.dataType = Res_value::TYPE_REFERENCE;
658        return util::make_unique<BinaryPrimitive>(nullType);
659    }
660
661    if (value->dataType == ExtendedTypes::TYPE_RAW_STRING) {
662        return util::make_unique<RawString>(mTable->stringPool.makeRef(
663                util::getString(mValuePool, data), StringPool::Context{ 1, config }));
664    }
665
666    // Treat this as a raw binary primitive.
667    return util::make_unique<BinaryPrimitive>(*value);
668}
669
670std::unique_ptr<Value> BinaryResourceParser::parseMapEntry(const ResourceNameRef& name,
671                                                           const ConfigDescription& config,
672                                                           const ResTable_map_entry* map) {
673    switch (name.type) {
674        case ResourceType::kStyle:
675            return parseStyle(name, config, map);
676        case ResourceType::kAttrPrivate:
677            // fallthrough
678        case ResourceType::kAttr:
679            return parseAttr(name, config, map);
680        case ResourceType::kIntegerArray:
681            // fallthrough
682        case ResourceType::kArray:
683            return parseArray(name, config, map);
684        case ResourceType::kStyleable:
685            return parseStyleable(name, config, map);
686        case ResourceType::kPlurals:
687            return parsePlural(name, config, map);
688        default:
689            assert(false && "unknown map type");
690            break;
691    }
692    return {};
693}
694
695std::unique_ptr<Style> BinaryResourceParser::parseStyle(const ResourceNameRef& name,
696                                                        const ConfigDescription& config,
697                                                        const ResTable_map_entry* map) {
698    std::unique_ptr<Style> style = util::make_unique<Style>();
699    if (util::deviceToHost32(map->parent.ident) == 0) {
700        // The parent is either not set or it is an unresolved symbol.
701        // Check to see if it is a symbol.
702        ResourceNameRef symbol;
703        if (getSymbol(&map->parent.ident, &symbol)) {
704            style->parent = Reference(symbol.toResourceName());
705        }
706    } else {
707         // The parent is a regular reference to a resource.
708        style->parent = Reference(util::deviceToHost32(map->parent.ident));
709    }
710
711    for (const ResTable_map& mapEntry : map) {
712        style->entries.emplace_back();
713        Style::Entry& styleEntry = style->entries.back();
714
715        if (util::deviceToHost32(mapEntry.name.ident) == 0) {
716            // The map entry's key (attribute) is not set. This must be
717            // a symbol reference, so resolve it.
718            ResourceNameRef symbol;
719            bool result = getSymbol(&mapEntry.name.ident, &symbol);
720            assert(result);
721            styleEntry.key.name = symbol.toResourceName();
722        } else {
723            // The map entry's key (attribute) is a regular reference.
724            styleEntry.key.id = ResourceId(util::deviceToHost32(mapEntry.name.ident));
725        }
726
727        // Parse the attribute's value.
728        styleEntry.value = parseValue(name, config, &mapEntry.value, 0);
729        assert(styleEntry.value);
730    }
731    return style;
732}
733
734std::unique_ptr<Attribute> BinaryResourceParser::parseAttr(const ResourceNameRef& name,
735                                                           const ConfigDescription& config,
736                                                           const ResTable_map_entry* map) {
737    const bool isWeak = (util::deviceToHost16(map->flags) & ResTable_entry::FLAG_WEAK) != 0;
738    std::unique_ptr<Attribute> attr = util::make_unique<Attribute>(isWeak);
739
740    // First we must discover what type of attribute this is. Find the type mask.
741    auto typeMaskIter = std::find_if(begin(map), end(map), [](const ResTable_map& entry) -> bool {
742        return util::deviceToHost32(entry.name.ident) == ResTable_map::ATTR_TYPE;
743    });
744
745    if (typeMaskIter != end(map)) {
746        attr->typeMask = util::deviceToHost32(typeMaskIter->value.data);
747    }
748
749    if (attr->typeMask & (ResTable_map::TYPE_ENUM | ResTable_map::TYPE_FLAGS)) {
750        for (const ResTable_map& mapEntry : map) {
751            if (Res_INTERNALID(util::deviceToHost32(mapEntry.name.ident))) {
752                continue;
753            }
754
755            Attribute::Symbol symbol;
756            symbol.value = util::deviceToHost32(mapEntry.value.data);
757            if (util::deviceToHost32(mapEntry.name.ident) == 0) {
758                // The map entry's key (id) is not set. This must be
759                // a symbol reference, so resolve it.
760                ResourceNameRef symbolName;
761                bool result = getSymbol(&mapEntry.name.ident, &symbolName);
762                assert(result);
763                symbol.symbol.name = symbolName.toResourceName();
764            } else {
765                // The map entry's key (id) is a regular reference.
766                symbol.symbol.id = ResourceId(util::deviceToHost32(mapEntry.name.ident));
767            }
768
769            attr->symbols.push_back(std::move(symbol));
770        }
771    }
772
773    // TODO(adamlesinski): Find min, max, i80n, etc attributes.
774    return attr;
775}
776
777std::unique_ptr<Array> BinaryResourceParser::parseArray(const ResourceNameRef& name,
778                                                        const ConfigDescription& config,
779                                                        const ResTable_map_entry* map) {
780    std::unique_ptr<Array> array = util::make_unique<Array>();
781    for (const ResTable_map& mapEntry : map) {
782        array->items.push_back(parseValue(name, config, &mapEntry.value, 0));
783    }
784    return array;
785}
786
787std::unique_ptr<Styleable> BinaryResourceParser::parseStyleable(const ResourceNameRef& name,
788                                                                const ConfigDescription& config,
789                                                                const ResTable_map_entry* map) {
790    std::unique_ptr<Styleable> styleable = util::make_unique<Styleable>();
791    for (const ResTable_map& mapEntry : map) {
792        if (util::deviceToHost32(mapEntry.name.ident) == 0) {
793            // The map entry's key (attribute) is not set. This must be
794            // a symbol reference, so resolve it.
795            ResourceNameRef symbol;
796            bool result = getSymbol(&mapEntry.name.ident, &symbol);
797            assert(result);
798            styleable->entries.emplace_back(symbol);
799        } else {
800            // The map entry's key (attribute) is a regular reference.
801            styleable->entries.emplace_back(util::deviceToHost32(mapEntry.name.ident));
802        }
803    }
804    return styleable;
805}
806
807std::unique_ptr<Plural> BinaryResourceParser::parsePlural(const ResourceNameRef& name,
808                                                          const ConfigDescription& config,
809                                                          const ResTable_map_entry* map) {
810    std::unique_ptr<Plural> plural = util::make_unique<Plural>();
811    for (const ResTable_map& mapEntry : map) {
812        std::unique_ptr<Item> item = parseValue(name, config, &mapEntry.value, 0);
813
814        switch (util::deviceToHost32(mapEntry.name.ident)) {
815            case android::ResTable_map::ATTR_ZERO:
816                plural->values[Plural::Zero] = std::move(item);
817                break;
818            case android::ResTable_map::ATTR_ONE:
819                plural->values[Plural::One] = std::move(item);
820                break;
821            case android::ResTable_map::ATTR_TWO:
822                plural->values[Plural::Two] = std::move(item);
823                break;
824            case android::ResTable_map::ATTR_FEW:
825                plural->values[Plural::Few] = std::move(item);
826                break;
827            case android::ResTable_map::ATTR_MANY:
828                plural->values[Plural::Many] = std::move(item);
829                break;
830            case android::ResTable_map::ATTR_OTHER:
831                plural->values[Plural::Other] = std::move(item);
832                break;
833        }
834    }
835    return plural;
836}
837
838} // namespace aapt
839