Dex完整代码解析

DexFile.h

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * Access .dex (Dalvik Executable Format) files.  The code here assumes that
 * the DEX file has been rewritten (byte-swapped, word-aligned) and that
 * the contents can be directly accessed as a collection of C arrays.  Please
 * see docs/dalvik/dex-format.html for a detailed description.
 *
 * The structure and field names were chosen to match those in the DEX spec.
 *
 * It's generally assumed that the DEX file will be stored in shared memory,
 * obviating the need to copy code and constant pool entries into newly
 * allocated storage.  Maintaining local pointers to items in the shared area
 * is valid and encouraged.
 *
 * All memory-mapped structures are 32-bit aligned unless otherwise noted.
 */

#ifndef LIBDEX_DEXFILE_H_
#define LIBDEX_DEXFILE_H_

#include "vm/Common.h"      // basic type defs, e.g. u1/u2/u4/u8, and LOG
#include "libdex/SysUtil.h"

/*
 * gcc-style inline management -- ensures we have a copy of all functions
 * in the library, so code that links against us will work whether or not
 * it was built with optimizations enabled.
 */
#ifndef _DEX_GEN_INLINES             /* only defined by DexInlines.c */
# define DEX_INLINE extern __inline__
#else
# define DEX_INLINE
#endif

/* DEX file magic number */
#define DEX_MAGIC       "dex\n"

/* current version, encoded in 4 bytes of ASCII */
#define DEX_MAGIC_VERS  "036\0"

/*
 * older but still-recognized version (corresponding to Android API
 * levels 13 and earlier
 */
#define DEX_MAGIC_VERS_API_13  "035\0"

/* same, but for optimized DEX header */
#define DEX_OPT_MAGIC   "dey\n"
#define DEX_OPT_MAGIC_VERS  "036\0"

#define DEX_DEP_MAGIC   "deps"

/*
 * 160-bit SHA-1 digest.
 */
enum { kSHA1DigestLen = 20,
       kSHA1DigestOutputLen = kSHA1DigestLen*2 +1 };

/* general constants */
enum {
    kDexEndianConstant = 0x12345678,    /* the endianness indicator */
    kDexNoIndex = 0xffffffff,           /* not a valid index value */
};

/*
 * Enumeration of all the primitive types.
 */
enum PrimitiveType {
    PRIM_NOT        = 0,       /* value is a reference type, not a primitive type */
    PRIM_VOID       = 1,
    PRIM_BOOLEAN    = 2,
    PRIM_BYTE       = 3,
    PRIM_SHORT      = 4,
    PRIM_CHAR       = 5,
    PRIM_INT        = 6,
    PRIM_LONG       = 7,
    PRIM_FLOAT      = 8,
    PRIM_DOUBLE     = 9,
};

/*
 * access flags and masks; the "standard" ones are all <= 0x4000
 *
 * Note: There are related declarations in vm/oo/Object.h in the ClassFlags
 * enum.
 */
enum {
    ACC_PUBLIC       = 0x00000001,       // class, field, method, ic
    ACC_PRIVATE      = 0x00000002,       // field, method, ic
    ACC_PROTECTED    = 0x00000004,       // field, method, ic
    ACC_STATIC       = 0x00000008,       // field, method, ic
    ACC_FINAL        = 0x00000010,       // class, field, method, ic
    ACC_SYNCHRONIZED = 0x00000020,       // method (only allowed on natives)
    ACC_SUPER        = 0x00000020,       // class (not used in Dalvik)
    ACC_VOLATILE     = 0x00000040,       // field
    ACC_BRIDGE       = 0x00000040,       // method (1.5)
    ACC_TRANSIENT    = 0x00000080,       // field
    ACC_VARARGS      = 0x00000080,       // method (1.5)
    ACC_NATIVE       = 0x00000100,       // method
    ACC_INTERFACE    = 0x00000200,       // class, ic
    ACC_ABSTRACT     = 0x00000400,       // class, method, ic
    ACC_STRICT       = 0x00000800,       // method
    ACC_SYNTHETIC    = 0x00001000,       // field, method, ic
    ACC_ANNOTATION   = 0x00002000,       // class, ic (1.5)
    ACC_ENUM         = 0x00004000,       // class, field, ic (1.5)
    ACC_CONSTRUCTOR  = 0x00010000,       // method (Dalvik only)
    ACC_DECLARED_SYNCHRONIZED =
                       0x00020000,       // method (Dalvik only)
    ACC_CLASS_MASK =
        (ACC_PUBLIC | ACC_FINAL | ACC_INTERFACE | ACC_ABSTRACT
                | ACC_SYNTHETIC | ACC_ANNOTATION | ACC_ENUM),
    ACC_INNER_CLASS_MASK =
        (ACC_CLASS_MASK | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC),
    ACC_FIELD_MASK =
        (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC | ACC_FINAL
                | ACC_VOLATILE | ACC_TRANSIENT | ACC_SYNTHETIC | ACC_ENUM),
    ACC_METHOD_MASK =
        (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC | ACC_FINAL
                | ACC_SYNCHRONIZED | ACC_BRIDGE | ACC_VARARGS | ACC_NATIVE
                | ACC_ABSTRACT | ACC_STRICT | ACC_SYNTHETIC | ACC_CONSTRUCTOR
                | ACC_DECLARED_SYNCHRONIZED),
};

/* annotation constants */
enum {
    kDexVisibilityBuild         = 0x00,     /* annotation visibility */
    kDexVisibilityRuntime       = 0x01,
    kDexVisibilitySystem        = 0x02,

    kDexAnnotationByte          = 0x00,
    kDexAnnotationShort         = 0x02,
    kDexAnnotationChar          = 0x03,
    kDexAnnotationInt           = 0x04,
    kDexAnnotationLong          = 0x06,
    kDexAnnotationFloat         = 0x10,
    kDexAnnotationDouble        = 0x11,
    kDexAnnotationString        = 0x17,
    kDexAnnotationType          = 0x18,
    kDexAnnotationField         = 0x19,
    kDexAnnotationMethod        = 0x1a,
    kDexAnnotationEnum          = 0x1b,
    kDexAnnotationArray         = 0x1c,
    kDexAnnotationAnnotation    = 0x1d,
    kDexAnnotationNull          = 0x1e,
    kDexAnnotationBoolean       = 0x1f,

    kDexAnnotationValueTypeMask = 0x1f,     /* low 5 bits */
    kDexAnnotationValueArgShift = 5,
};

/* map item type codes */
enum {
    kDexTypeHeaderItem               = 0x0000,
    kDexTypeStringIdItem             = 0x0001,
    kDexTypeTypeIdItem               = 0x0002,
    kDexTypeProtoIdItem              = 0x0003,
    kDexTypeFieldIdItem              = 0x0004,
    kDexTypeMethodIdItem             = 0x0005,
    kDexTypeClassDefItem             = 0x0006,
    kDexTypeMapList                  = 0x1000,
    kDexTypeTypeList                 = 0x1001,
    kDexTypeAnnotationSetRefList     = 0x1002,
    kDexTypeAnnotationSetItem        = 0x1003,
    kDexTypeClassDataItem            = 0x2000,
    kDexTypeCodeItem                 = 0x2001,
    kDexTypeStringDataItem           = 0x2002,
    kDexTypeDebugInfoItem            = 0x2003,
    kDexTypeAnnotationItem           = 0x2004,
    kDexTypeEncodedArrayItem         = 0x2005,
    kDexTypeAnnotationsDirectoryItem = 0x2006,
};

/* auxillary data section chunk codes */
enum {
    kDexChunkClassLookup            = 0x434c4b50,   /* CLKP */
    kDexChunkRegisterMaps           = 0x524d4150,   /* RMAP */

    kDexChunkEnd                    = 0x41454e44,   /* AEND */
};

/* debug info opcodes and constants */
enum {
    DBG_END_SEQUENCE         = 0x00,
    DBG_ADVANCE_PC           = 0x01,
    DBG_ADVANCE_LINE         = 0x02,
    DBG_START_LOCAL          = 0x03,
    DBG_START_LOCAL_EXTENDED = 0x04,
    DBG_END_LOCAL            = 0x05,
    DBG_RESTART_LOCAL        = 0x06,
    DBG_SET_PROLOGUE_END     = 0x07,
    DBG_SET_EPILOGUE_BEGIN   = 0x08,
    DBG_SET_FILE             = 0x09,
    DBG_FIRST_SPECIAL        = 0x0a,
    DBG_LINE_BASE            = -4,
    DBG_LINE_RANGE           = 15,
};

/*
 * Direct-mapped "header_item" struct.
 */
struct DexHeader {
    u1  magic[8];           /* includes version number */
    u4  checksum;           /* adler32 checksum */
    u1  signature[kSHA1DigestLen]; /* SHA-1 hash */
    u4  fileSize;           /* length of entire file */
    u4  headerSize;         /* offset to start of next section */
    u4  endianTag;
    u4  linkSize;
    u4  linkOff;
    u4  mapOff;
    u4  stringIdsSize;
    u4  stringIdsOff;
    u4  typeIdsSize;
    u4  typeIdsOff;
    u4  protoIdsSize;
    u4  protoIdsOff;
    u4  fieldIdsSize;
    u4  fieldIdsOff;
    u4  methodIdsSize;
    u4  methodIdsOff;
    u4  classDefsSize;
    u4  classDefsOff;
    u4  dataSize;
    u4  dataOff;
};

/*
 * Direct-mapped "map_item".
 */
struct DexMapItem {
    u2 type;              /* type code (see kDexType* above) */
    u2 unused;
    u4 size;              /* count of items of the indicated type */
    u4 offset;            /* file offset to the start of data */
};

/*
 * Direct-mapped "map_list".
 */
struct DexMapList {
    u4  size;               /* #of entries in list */
    DexMapItem list[1];     /* entries */
};

/*
 * Direct-mapped "string_id_item".
 */
struct DexStringId {
    u4 stringDataOff;      /* file offset to string_data_item */
};

/*
 * Direct-mapped "type_id_item".
 */
struct DexTypeId {
    u4  descriptorIdx;      /* index into stringIds list for type descriptor */
};

/*
 * Direct-mapped "field_id_item".
 */
struct DexFieldId {
    u2  classIdx;           /* index into typeIds list for defining class */
    u2  typeIdx;            /* index into typeIds for field type */
    u4  nameIdx;            /* index into stringIds for field name */
};

/*
 * Direct-mapped "method_id_item".
 */
struct DexMethodId {
    u2  classIdx;           /* index into typeIds list for defining class */
    u2  protoIdx;           /* index into protoIds for method prototype */
    u4  nameIdx;            /* index into stringIds for method name */
};

/*
 * Direct-mapped "proto_id_item".
 */
struct DexProtoId {
    u4  shortyIdx;          /* index into stringIds for shorty descriptor */
    u4  returnTypeIdx;      /* index into typeIds list for return type */
    u4  parametersOff;      /* file offset to type_list for parameter types */
};

/*
 * Direct-mapped "class_def_item".
 */
struct DexClassDef {
    u4  classIdx;           /* index into typeIds for this class */
    u4  accessFlags;
    u4  superclassIdx;      /* index into typeIds for superclass */
    u4  interfacesOff;      /* file offset to DexTypeList */
    u4  sourceFileIdx;      /* index into stringIds for source file name */
    u4  annotationsOff;     /* file offset to annotations_directory_item */
    u4  classDataOff;       /* file offset to class_data_item */
    u4  staticValuesOff;    /* file offset to DexEncodedArray */
};

/*
 * Direct-mapped "type_item".
 */
struct DexTypeItem {
    u2  typeIdx;            /* index into typeIds */
};

/*
 * Direct-mapped "type_list".
 */
struct DexTypeList {
    u4  size;               /* #of entries in list */
    DexTypeItem list[1];    /* entries */
};

/*
 * Direct-mapped "code_item".
 *
 * The "catches" table is used when throwing an exception,
 * "debugInfo" is used when displaying an exception stack trace or
 * debugging. An offset of zero indicates that there are no entries.
 */
struct DexCode {
    u2  registersSize;
    u2  insSize;
    u2  outsSize;
    u2  triesSize;
    u4  debugInfoOff;       /* file offset to debug info stream */
    u4  insnsSize;          /* size of the insns array, in u2 units */
    u2  insns[1];
    /* followed by optional u2 padding */
    /* followed by try_item[triesSize] */
    /* followed by uleb128 handlersSize */
    /* followed by catch_handler_item[handlersSize] */
};

/*
 * Direct-mapped "try_item".
 */
struct DexTry {
    u4  startAddr;          /* start address, in 16-bit code units */
    u2  insnCount;          /* instruction count, in 16-bit code units */
    u2  handlerOff;         /* offset in encoded handler data to handlers */
};

/*
 * Link table.  Currently undefined.
 */
struct DexLink {
    u1  bleargh;
};


/*
 * Direct-mapped "annotations_directory_item".
 */
struct DexAnnotationsDirectoryItem {
    u4  classAnnotationsOff;  /* offset to DexAnnotationSetItem */
    u4  fieldsSize;           /* count of DexFieldAnnotationsItem */
    u4  methodsSize;          /* count of DexMethodAnnotationsItem */
    u4  parametersSize;       /* count of DexParameterAnnotationsItem */
    /* followed by DexFieldAnnotationsItem[fieldsSize] */
    /* followed by DexMethodAnnotationsItem[methodsSize] */
    /* followed by DexParameterAnnotationsItem[parametersSize] */
};

/*
 * Direct-mapped "field_annotations_item".
 */
struct DexFieldAnnotationsItem {
    u4  fieldIdx;
    u4  annotationsOff;             /* offset to DexAnnotationSetItem */
};

/*
 * Direct-mapped "method_annotations_item".
 */
struct DexMethodAnnotationsItem {
    u4  methodIdx;
    u4  annotationsOff;             /* offset to DexAnnotationSetItem */
};

/*
 * Direct-mapped "parameter_annotations_item".
 */
struct DexParameterAnnotationsItem {
    u4  methodIdx;
    u4  annotationsOff;             /* offset to DexAnotationSetRefList */
};

/*
 * Direct-mapped "annotation_set_ref_item".
 */
struct DexAnnotationSetRefItem {
    u4  annotationsOff;             /* offset to DexAnnotationSetItem */
};

/*
 * Direct-mapped "annotation_set_ref_list".
 */
struct DexAnnotationSetRefList {
    u4  size;
    DexAnnotationSetRefItem list[1];
};

/*
 * Direct-mapped "annotation_set_item".
 */
struct DexAnnotationSetItem {
    u4  size;
    u4  entries[1];                 /* offset to DexAnnotationItem */
};

/*
 * Direct-mapped "annotation_item".
 *
 * NOTE: this structure is byte-aligned.
 */
struct DexAnnotationItem {
    u1  visibility;
    u1  annotation[1];              /* data in encoded_annotation format */
};

/*
 * Direct-mapped "encoded_array".
 *
 * NOTE: this structure is byte-aligned.
 */
struct DexEncodedArray {
    u1  array[1];                   /* data in encoded_array format */
};

/*
 * Lookup table for classes.  It provides a mapping from class name to
 * class definition.  Used by dexFindClass().
 *
 * We calculate this at DEX optimization time and embed it in the file so we
 * don't need the same hash table in every VM.  This is slightly slower than
 * a hash table with direct pointers to the items, but because it's shared
 * there's less of a penalty for using a fairly sparse table.
 */
struct DexClassLookup {
    int     size;                       // total size, including "size"
    int     numEntries;                 // size of table[]; always power of 2
    struct {
        u4      classDescriptorHash;    // class descriptor hash code
        int     classDescriptorOffset;  // in bytes, from start of DEX
        int     classDefOffset;         // in bytes, from start of DEX
    } table[1];
};

/*
 * Header added by DEX optimization pass.  Values are always written in
 * local byte and structure padding.  The first field (magic + version)
 * is guaranteed to be present and directly readable for all expected
 * compiler configurations; the rest is version-dependent.
 *
 * Try to keep this simple and fixed-size.
 */
struct DexOptHeader {
    u1  magic[8];           /* includes version number */

    u4  dexOffset;          /* file offset of DEX header */
    u4  dexLength;
    u4  depsOffset;         /* offset of optimized DEX dependency table */
    u4  depsLength;
    u4  optOffset;          /* file offset of optimized data tables */
    u4  optLength;

    u4  flags;              /* some info flags */
    u4  checksum;           /* adler32 checksum covering deps/opt */

    /* pad for 64-bit alignment if necessary */
};

#define DEX_OPT_FLAG_BIG            (1<<1)  /* swapped to big-endian */

#define DEX_INTERFACE_CACHE_SIZE    128     /* must be power of 2 */

/*
 * Structure representing a DEX file.
 *
 * Code should regard DexFile as opaque, using the API calls provided here
 * to access specific structures.
 */
struct DexFile {
    /* directly-mapped "opt" header */
    const DexOptHeader* pOptHeader;

    /* pointers to directly-mapped structs and arrays in base DEX */
    const DexHeader*    pHeader;
    const DexStringId*  pStringIds;
    const DexTypeId*    pTypeIds;
    const DexFieldId*   pFieldIds;
    const DexMethodId*  pMethodIds;
    const DexProtoId*   pProtoIds;
    const DexClassDef*  pClassDefs;
    const DexLink*      pLinkData;

    /*
     * These are mapped out of the "auxillary" section, and may not be
     * included in the file.
     */
    const DexClassLookup* pClassLookup;
    const void*         pRegisterMapPool;       // RegisterMapClassPool

    /* points to start of DEX file data */
    const u1*           baseAddr;

    /* track memory overhead for auxillary structures */
    int                 overhead;

    /* additional app-specific data structures associated with the DEX */
    //void*               auxData;
};

/*
 * Utility function -- rounds up to the nearest power of 2.
 */
u4 dexRoundUpPower2(u4 val);

/*
 * Parse an optimized or unoptimized .dex file sitting in memory.
 *
 * On success, return a newly-allocated DexFile.
 */
DexFile* dexFileParse(const u1* data, size_t length, int flags);

/* bit values for "flags" argument to dexFileParse */
enum {
    kDexParseDefault            = 0,
    kDexParseVerifyChecksum     = 1,
    kDexParseContinueOnError    = (1 << 1),
};

/*
 * Fix the byte ordering of all fields in the DEX file, and do
 * structural verification. This is only required for code that opens
 * "raw" DEX files, such as the DEX optimizer.
 *
 * Return 0 on success.
 */
int dexSwapAndVerify(u1* addr, int len);

/*
 * Detect the file type of the given memory buffer via magic number.
 * Call dexSwapAndVerify() on an unoptimized DEX file, do nothing
 * but return successfully on an optimized DEX file, and report an
 * error for all other cases.
 *
 * Return 0 on success.
 */
int dexSwapAndVerifyIfNecessary(u1* addr, int len);

/*
 * Check to see if the file magic and format version in the given
 * header are recognized as valid. Returns true if they are
 * acceptable.
 */
bool dexHasValidMagic(const DexHeader* pHeader);

/*
 * Compute DEX checksum.
 */
u4 dexComputeChecksum(const DexHeader* pHeader);

/*
 * Free a DexFile structure, along with any associated structures.
 */
void dexFileFree(DexFile* pDexFile);

/*
 * Create class lookup table.
 */
DexClassLookup* dexCreateClassLookup(DexFile* pDexFile);

/*
 * Find a class definition by descriptor.
 */
const DexClassDef* dexFindClass(const DexFile* pFile, const char* descriptor);

/*
 * Set up the basic raw data pointers of a DexFile. This function isn't
 * meant for general use.
 */
void dexFileSetupBasicPointers(DexFile* pDexFile, const u1* data);

/* return the DexMapList of the file, if any */
DEX_INLINE const DexMapList* dexGetMap(const DexFile* pDexFile) {
    u4 mapOff = pDexFile->pHeader->mapOff;

    if (mapOff == 0) {
        return NULL;
    } else {
        return (const DexMapList*) (pDexFile->baseAddr + mapOff);
    }
}

/* return the const char* string data referred to by the given string_id */
DEX_INLINE const char* dexGetStringData(const DexFile* pDexFile,
        const DexStringId* pStringId) {
    const u1* ptr = pDexFile->baseAddr + pStringId->stringDataOff;

    // Skip the uleb128 length.
    while (*(ptr++) > 0x7f) /* empty */ ;

    return (const char*) ptr;
}
/* return the StringId with the specified index */
DEX_INLINE const DexStringId* dexGetStringId(const DexFile* pDexFile, u4 idx) {
    assert(idx < pDexFile->pHeader->stringIdsSize);
    return &pDexFile->pStringIds[idx];
}
/* return the UTF-8 encoded string with the specified string_id index */
DEX_INLINE const char* dexStringById(const DexFile* pDexFile, u4 idx) {
    const DexStringId* pStringId = dexGetStringId(pDexFile, idx);
    return dexGetStringData(pDexFile, pStringId);
}

/* Return the UTF-8 encoded string with the specified string_id index,
 * also filling in the UTF-16 size (number of 16-bit code points).*/
const char* dexStringAndSizeById(const DexFile* pDexFile, u4 idx,
        u4* utf16Size);

/* return the TypeId with the specified index */
DEX_INLINE const DexTypeId* dexGetTypeId(const DexFile* pDexFile, u4 idx) {
    assert(idx < pDexFile->pHeader->typeIdsSize);
    return &pDexFile->pTypeIds[idx];
}

/*
 * Get the descriptor string associated with a given type index.
 * The caller should not free() the returned string.
 */
DEX_INLINE const char* dexStringByTypeIdx(const DexFile* pDexFile, u4 idx) {
    const DexTypeId* typeId = dexGetTypeId(pDexFile, idx);
    return dexStringById(pDexFile, typeId->descriptorIdx);
}

/* return the MethodId with the specified index */
DEX_INLINE const DexMethodId* dexGetMethodId(const DexFile* pDexFile, u4 idx) {
    assert(idx < pDexFile->pHeader->methodIdsSize);
    return &pDexFile->pMethodIds[idx];
}

/* return the FieldId with the specified index */
DEX_INLINE const DexFieldId* dexGetFieldId(const DexFile* pDexFile, u4 idx) {
    assert(idx < pDexFile->pHeader->fieldIdsSize);
    return &pDexFile->pFieldIds[idx];
}

/* return the ProtoId with the specified index */
DEX_INLINE const DexProtoId* dexGetProtoId(const DexFile* pDexFile, u4 idx) {
    assert(idx < pDexFile->pHeader->protoIdsSize);
    return &pDexFile->pProtoIds[idx];
}

/*
 * Get the parameter list from a ProtoId. The returns NULL if the ProtoId
 * does not have a parameter list.
 */
DEX_INLINE const DexTypeList* dexGetProtoParameters(
    const DexFile *pDexFile, const DexProtoId* pProtoId) {
    if (pProtoId->parametersOff == 0) {
        return NULL;
    }
    return (const DexTypeList*)
        (pDexFile->baseAddr + pProtoId->parametersOff);
}

/* return the ClassDef with the specified index */
DEX_INLINE const DexClassDef* dexGetClassDef(const DexFile* pDexFile, u4 idx) {
    assert(idx < pDexFile->pHeader->classDefsSize);
    return &pDexFile->pClassDefs[idx];
}

/* given a ClassDef pointer, recover its index */
DEX_INLINE u4 dexGetIndexForClassDef(const DexFile* pDexFile,
    const DexClassDef* pClassDef)
{
    assert(pClassDef >= pDexFile->pClassDefs &&
           pClassDef < pDexFile->pClassDefs + pDexFile->pHeader->classDefsSize);
    return pClassDef - pDexFile->pClassDefs;
}

/* get the interface list for a DexClass */
DEX_INLINE const DexTypeList* dexGetInterfacesList(const DexFile* pDexFile,
    const DexClassDef* pClassDef)
{
    if (pClassDef->interfacesOff == 0)
        return NULL;
    return (const DexTypeList*)
        (pDexFile->baseAddr + pClassDef->interfacesOff);
}
/* return the Nth entry in a DexTypeList. */
DEX_INLINE const DexTypeItem* dexGetTypeItem(const DexTypeList* pList,
    u4 idx)
{
    assert(idx < pList->size);
    return &pList->list[idx];
}
/* return the type_idx for the Nth entry in a TypeList */
DEX_INLINE u4 dexTypeListGetIdx(const DexTypeList* pList, u4 idx) {
    const DexTypeItem* pItem = dexGetTypeItem(pList, idx);
    return pItem->typeIdx;
}

/* get the static values list for a DexClass */
DEX_INLINE const DexEncodedArray* dexGetStaticValuesList(
    const DexFile* pDexFile, const DexClassDef* pClassDef)
{
    if (pClassDef->staticValuesOff == 0)
        return NULL;
    return (const DexEncodedArray*)
        (pDexFile->baseAddr + pClassDef->staticValuesOff);
}

/* get the annotations directory item for a DexClass */
DEX_INLINE const DexAnnotationsDirectoryItem* dexGetAnnotationsDirectoryItem(
    const DexFile* pDexFile, const DexClassDef* pClassDef)
{
    if (pClassDef->annotationsOff == 0)
        return NULL;
    return (const DexAnnotationsDirectoryItem*)
        (pDexFile->baseAddr + pClassDef->annotationsOff);
}

/* get the source file string */
DEX_INLINE const char* dexGetSourceFile(
    const DexFile* pDexFile, const DexClassDef* pClassDef)
{
    if (pClassDef->sourceFileIdx == 0xffffffff)
        return NULL;
    return dexStringById(pDexFile, pClassDef->sourceFileIdx);
}

/* get the size, in bytes, of a DexCode */
size_t dexGetDexCodeSize(const DexCode* pCode);

/* Get the list of "tries" for the given DexCode. */
DEX_INLINE const DexTry* dexGetTries(const DexCode* pCode) {
    const u2* insnsEnd = &pCode->insns[pCode->insnsSize];

    // Round to four bytes.
    if ((((uintptr_t) insnsEnd) & 3) != 0) {
        insnsEnd++;
    }

    return (const DexTry*) insnsEnd;
}

/* Get the base of the encoded data for the given DexCode. */
DEX_INLINE const u1* dexGetCatchHandlerData(const DexCode* pCode) {
    const DexTry* pTries = dexGetTries(pCode);
    return (const u1*) &pTries[pCode->triesSize];
}

/* get a pointer to the start of the debugging data */
DEX_INLINE const u1* dexGetDebugInfoStream(const DexFile* pDexFile,
    const DexCode* pCode)
{
    if (pCode->debugInfoOff == 0) {
        return NULL;
    } else {
        return pDexFile->baseAddr + pCode->debugInfoOff;
    }
}

/* DexClassDef convenience - get class descriptor */
DEX_INLINE const char* dexGetClassDescriptor(const DexFile* pDexFile,
    const DexClassDef* pClassDef)
{
    return dexStringByTypeIdx(pDexFile, pClassDef->classIdx);
}

/* DexClassDef convenience - get superclass descriptor */
DEX_INLINE const char* dexGetSuperClassDescriptor(const DexFile* pDexFile,
    const DexClassDef* pClassDef)
{
    if (pClassDef->superclassIdx == 0)
        return NULL;
    return dexStringByTypeIdx(pDexFile, pClassDef->superclassIdx);
}

/* DexClassDef convenience - get class_data_item pointer */
DEX_INLINE const u1* dexGetClassData(const DexFile* pDexFile,
    const DexClassDef* pClassDef)
{
    if (pClassDef->classDataOff == 0)
        return NULL;
    return (const u1*) (pDexFile->baseAddr + pClassDef->classDataOff);
}

/* Get an annotation set at a particular offset. */
DEX_INLINE const DexAnnotationSetItem* dexGetAnnotationSetItem(
    const DexFile* pDexFile, u4 offset)
{
    if (offset == 0) {
        return NULL;
    }
    return (const DexAnnotationSetItem*) (pDexFile->baseAddr + offset);
}
/* get the class' annotation set */
DEX_INLINE const DexAnnotationSetItem* dexGetClassAnnotationSet(
    const DexFile* pDexFile, const DexAnnotationsDirectoryItem* pAnnoDir)
{
    return dexGetAnnotationSetItem(pDexFile, pAnnoDir->classAnnotationsOff);
}

/* get the class' field annotation list */
DEX_INLINE const DexFieldAnnotationsItem* dexGetFieldAnnotations(
    const DexFile* pDexFile, const DexAnnotationsDirectoryItem* pAnnoDir)
{
    if (pAnnoDir->fieldsSize == 0)
        return NULL;

    // Skip past the header to the start of the field annotations.
    return (const DexFieldAnnotationsItem*) &pAnnoDir[1];
}

/* get field annotation list size */
DEX_INLINE int dexGetFieldAnnotationsSize(const DexFile* pDexFile,
    const DexAnnotationsDirectoryItem* pAnnoDir)
{
    return pAnnoDir->fieldsSize;
}

/* return a pointer to the field's annotation set */
DEX_INLINE const DexAnnotationSetItem* dexGetFieldAnnotationSetItem(
    const DexFile* pDexFile, const DexFieldAnnotationsItem* pItem)
{
    return dexGetAnnotationSetItem(pDexFile, pItem->annotationsOff);
}

/* get the class' method annotation list */
DEX_INLINE const DexMethodAnnotationsItem* dexGetMethodAnnotations(
    const DexFile* pDexFile, const DexAnnotationsDirectoryItem* pAnnoDir)
{
    if (pAnnoDir->methodsSize == 0)
        return NULL;

    /*
     * Skip past the header and field annotations to the start of the
     * method annotations.
     */
    const u1* addr = (const u1*) &pAnnoDir[1];
    addr += pAnnoDir->fieldsSize * sizeof (DexFieldAnnotationsItem);
    return (const DexMethodAnnotationsItem*) addr;
}

/* get method annotation list size */
DEX_INLINE int dexGetMethodAnnotationsSize(const DexFile* pDexFile,
    const DexAnnotationsDirectoryItem* pAnnoDir)
{
    return pAnnoDir->methodsSize;
}

/* return a pointer to the method's annotation set */
DEX_INLINE const DexAnnotationSetItem* dexGetMethodAnnotationSetItem(
    const DexFile* pDexFile, const DexMethodAnnotationsItem* pItem)
{
    return dexGetAnnotationSetItem(pDexFile, pItem->annotationsOff);
}

/* get the class' parameter annotation list */
DEX_INLINE const DexParameterAnnotationsItem* dexGetParameterAnnotations(
    const DexFile* pDexFile, const DexAnnotationsDirectoryItem* pAnnoDir)
{
    if (pAnnoDir->parametersSize == 0)
        return NULL;

    /*
     * Skip past the header, field annotations, and method annotations
     * to the start of the parameter annotations.
     */
    const u1* addr = (const u1*) &pAnnoDir[1];
    addr += pAnnoDir->fieldsSize * sizeof (DexFieldAnnotationsItem);
    addr += pAnnoDir->methodsSize * sizeof (DexMethodAnnotationsItem);
    return (const DexParameterAnnotationsItem*) addr;
}

/* get method annotation list size */
DEX_INLINE int dexGetParameterAnnotationsSize(const DexFile* pDexFile,
    const DexAnnotationsDirectoryItem* pAnnoDir)
{
    return pAnnoDir->parametersSize;
}

/* return the parameter annotation ref list */
DEX_INLINE const DexAnnotationSetRefList* dexGetParameterAnnotationSetRefList(
    const DexFile* pDexFile, const DexParameterAnnotationsItem* pItem)
{
    if (pItem->annotationsOff == 0) {
        return NULL;
    }
    return (const DexAnnotationSetRefList*) (pDexFile->baseAddr + pItem->annotationsOff);
}

/* get method annotation list size */
DEX_INLINE int dexGetParameterAnnotationSetRefSize(const DexFile* pDexFile,
    const DexParameterAnnotationsItem* pItem)
{
    if (pItem->annotationsOff == 0) {
        return 0;
    }
    return dexGetParameterAnnotationSetRefList(pDexFile, pItem)->size;
}

/* return the Nth entry from an annotation set ref list */
DEX_INLINE const DexAnnotationSetRefItem* dexGetParameterAnnotationSetRef(
    const DexAnnotationSetRefList* pList, u4 idx)
{
    assert(idx < pList->size);
    return &pList->list[idx];
}

/* given a DexAnnotationSetRefItem, return the DexAnnotationSetItem */
DEX_INLINE const DexAnnotationSetItem* dexGetSetRefItemItem(
    const DexFile* pDexFile, const DexAnnotationSetRefItem* pItem)
{
    return dexGetAnnotationSetItem(pDexFile, pItem->annotationsOff);
}

/* return the Nth annotation offset from a DexAnnotationSetItem */
DEX_INLINE u4 dexGetAnnotationOff(
    const DexAnnotationSetItem* pAnnoSet, u4 idx)
{
    assert(idx < pAnnoSet->size);
    return pAnnoSet->entries[idx];
}

/* return the Nth annotation item from a DexAnnotationSetItem */
DEX_INLINE const DexAnnotationItem* dexGetAnnotationItem(
    const DexFile* pDexFile, const DexAnnotationSetItem* pAnnoSet, u4 idx)
{
    u4 offset = dexGetAnnotationOff(pAnnoSet, idx);
    if (offset == 0) {
        return NULL;
    }
    return (const DexAnnotationItem*) (pDexFile->baseAddr + offset);
}

/*
 * Get the type descriptor character associated with a given primitive
 * type. This returns '\0' if the type is invalid.
 */
char dexGetPrimitiveTypeDescriptorChar(PrimitiveType type);

/*
 * Get the type descriptor string associated with a given primitive
 * type.
 */
const char* dexGetPrimitiveTypeDescriptor(PrimitiveType type);

/*
 * Get the boxed type descriptor string associated with a given
 * primitive type. This returns NULL for an invalid type, including
 * particularly for type "void". In the latter case, even though there
 * is a class Void, there's no such thing as a boxed instance of it.
 */
const char* dexGetBoxedTypeDescriptor(PrimitiveType type);

/*
 * Get the primitive type constant from the given descriptor character.
 * This returns PRIM_NOT (note: this is a 0) if the character is invalid
 * as a primitive type descriptor.
 */
PrimitiveType dexGetPrimitiveTypeFromDescriptorChar(char descriptorChar);

#endif  // LIBDEX_DEXFILE_H_

DexType.java

package com.pediy.test;

//import org.jf.dexlib.Code.Instruction;
//import org.jf.dexlib.Code.InstructionIterator;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class DexType {

    public DexHeader dexHeader;
    public ArrayList<DexStringId> dexStringId; //�����ַ���ƫ�ƴ洢
    public ArrayList<String > dexStringList;//�����ַ���
    public ArrayList<DexTypeId> dexTypeId;//����dexTypeID
    public ArrayList<String > dexTypeList;//����type
    public ArrayList<DexProtoId> dexProtoId;//����dexProtoID
    public ArrayList<String > dexProtoIdString;
    public ArrayList<String > dexProtoIdType;
    public ArrayList<DexTypeList> dexTypeLists;
    public ArrayList<String > dexProtoList;
    public ArrayList<DexFieldId> dexFieldId;
    public ArrayList<String > dexFieldList;
    public ArrayList<DexMethodId> dexMethodId;
    public ArrayList<String > dexMethodList;
    public ArrayList<DexClassDef> dexClassDefs;
    public ArrayList<DexClassData> dexClassData;
    public DexMapList dexMapLists;


    //���캯��
    DexType(){
        dexHeader = new DexHeader();

        dexStringId = new ArrayList<DexStringId>();
        dexStringList = new ArrayList<String >();

        dexTypeId =  new ArrayList<DexTypeId >();
        dexTypeList = new ArrayList<String >();
        dexTypeLists = new ArrayList<DexTypeList>();

        dexProtoId = new ArrayList<DexProtoId>();
        dexProtoIdString = new ArrayList<String >();
        dexProtoIdType = new ArrayList<String >();
        dexProtoList = new ArrayList<String >();

        dexFieldId = new ArrayList<DexFieldId>();
        dexFieldList = new ArrayList<String >();

        dexMethodId = new ArrayList<DexMethodId>();
        dexMethodList = new ArrayList<String >();

        dexClassDefs = new ArrayList<DexClassDef>();
        dexClassData = new ArrayList<DexClassData>();

        dexMapLists = new DexMapList();
    }

    /**
     * typedef struct DexHeader{
     *     u1 magic[8];                   //dex�汾��ʶ8��1�ֽ�
     *     u4 checksum;                   //adler32У��1��4�ֽ�
     *     u1 signature[kSHA1DigestLen];  //SHA-1��ϣֵ
     *     u4 fileSize;                   //�����ļ��Ĵ�С
     *     u4 headerSize;                 //DexHeader�Ľṹ��С
     *     u4 endianTag;                  //�ֽ�����
     *     u4 linkSize;                   //���Ӷδ�С
     *     u4 linkOff;                    //���Ӷ�ƫ��
     *     u4 mapOff;                     //DexMapList���ļ�ƫ��
     *     u4 stringIdsSize;              //DexStringId�ĸ���
     *     u4 stringIdsOff;               //DexStringId���ļ�ƫ��
     *     u4 typeIdsSize;                //DexTupeID�ĸ���
     *     u4 typeIdsOff;                 //DexTypeId���ļ�ƫ��
     *     u4 protoIdsSize;               //DexProtoId�ĸ���
     *     u4 protoIdsOff;                //DexProtoId���ļ�ƫ��
     *     u4 fieldIdsSize;               //DexFieldId�ĸ���
     *     u4 fieldIdsOff;                //DexFieldId���ļ�ƫ��
     *     u4 methodIdsSize;              //DexMethodId�ĸ���
     *     u4 methodIdsOff;               //DexMethodID���ļ�ƫ��
     *     u4 classDefsSize;              //DexClassDef�ĸ���
     *     u4 classDefsOff;               //DexClassDef���ļ�ƫ��
     *     u4 dataSize;                   //���ݶεĴ�С
     *     u4 dataOff;                    //���ݶε��ļ�ƫ��
     * }
     */
    public class DexHeader{
        public byte[] magic = new byte[8];          //dex�汾��ʶ
        public byte[] checksum = new byte[4];       //adler32��
        public byte[] signature = new byte[20];     //sha-1��ϣֵ
        public byte[] fileSize = new byte[4];       //�����ļ��Ĵ�С
        public byte[] headerSize = new byte[4];     //DexHeader�ṹ��С
        public byte[] endianTag = new byte[4];      //����
        public byte[] linkSize = new byte[4];       //���Ӷδ�С
        public byte[] linkOff = new byte[4];       //���Ӷ�ƫ��
        public byte[] mapOff = new byte[4];       //DexMapList���ļ�ƫ��
        public byte[] stringIdsSize = new byte[4];       //DexStringId�ĸ���
        public byte[] stringIdsOff = new byte[4];       //DexStringId���ļ�ƫ��
        public byte[] typeIdsSize = new byte[4];       //
        public byte[] typeIdsOff = new byte[4];       //
        public byte[] protoIdsSize = new byte[4];       //
        public byte[] protoIdsOff = new byte[4];       //
        public byte[] fieldIdsSize = new byte[4];       //
        public byte[] fieldIdsOff = new byte[4];       //
        public byte[] methodIdsSize = new byte[4];       //
        public byte[] methodIdsOff = new byte[4];       //
        public byte[] classDefsSize = new byte[4];       //
        public byte[] classDefsOff = new byte[4];       //
        public byte[] dataSize = new byte[4];       //
        public byte[] dataOff = new byte[4];       //

        public List<byte[]> em = new ArrayList<>();

        public DexHeader() {
            this.em.add(magic);
            this.em.add(checksum);
            this.em.add(signature);
            this.em.add(fileSize);
            this.em.add(headerSize);
            this.em.add(endianTag);
            this.em.add(linkSize);
            this.em.add(linkOff);
            this.em.add(mapOff);
            this.em.add(stringIdsSize);
            this.em.add(stringIdsOff);
            this.em.add(typeIdsSize);
            this.em.add(typeIdsOff);
            this.em.add(protoIdsSize);
            this.em.add(protoIdsOff);
            this.em.add(fieldIdsSize);
            this.em.add(fieldIdsOff);
            this.em.add(methodIdsSize);
            this.em.add(methodIdsOff);
            this.em.add(classDefsSize);
            this.em.add(classDefsOff);
            this.em.add(dataSize);
            this.em.add(dataOff);
        }
    }

    /**
     * typedef struct DexStringId{
     *      u4 stringDataOff;
     * }
     */
    public class DexStringId{
        public byte[] stringDataOff= new byte[4];
    }

    /**
     * typedef struct DexTypeId{
     *     u4 descriptorIdx;
     * }
     */
    public class DexTypeId{
        public byte[] descriptorIdx=new byte[4];
    }

    /**
     * typedef struct DexProtoId{
     *     u4 shortyIdx;
     *     u4 returnTypeIdx;
     *     u4 parametersOff;
     * }
     */
    public class DexProtoId{
        public byte[] shortyIdx=new byte[4];
        public byte[] returnTypeIdx=new byte[4];
        public byte[] parametersOff=new byte[4];
        public List<DexTypeItem> dexTypeItemList = new ArrayList<>();
    }

    /**
     * typedef struct DexTypeItem{
     *     u2 typeIdx;
     * }
     */
    public class DexTypeItem{
        public byte[] typeIdx=new byte[2];
    }

    /**
     * typedef struct DexTypeList{
     *     u4 size;
     *     DexTypeItem list[11;
     * }
     */
    public class DexTypeList{
        public byte[] size=new byte[4];
        public ArrayList<DexTypeItem> list=new ArrayList<DexTypeItem>();
    }

    /**
     * typedef struct DexFieldId{
     *     u4 classIdx;
     *     u4 typeIdx;
     *     u4 nameIdx;
     * }
     */
    public class DexFieldId{
        public byte[] classIdx=new byte[2];
        public byte[] typeIdx=new byte[2];
        public byte[] nameIdx=new byte[4];
    }

    /**
     * typedef struct DexMethodId{
     *     u4 classIdx;
     *     u4 protoIdx;
     *     u4 nameIdx;
     * }
     */
    public class DexMethodId{
        public byte[] classIdx=new byte[2];
        public byte[] protoIdx=new byte[2];
        public byte[] nameIdx=new byte[4];
    }

    /**
     * typedef struct DexClassDef{
     *     u4 classIdx;
     *     u4 accessFlags;
     *     u4 superclassIdx;
     *     u4 interfacesOff;
     *     u4 sourceFileIdx;
     *     u4 annotationsOff;
     *     u4 classDataOff;
     *     u4 staticValuesOff;
     * }
     */
    public class DexClassDef{
        public byte[] classIdx=new byte[4];
        public byte[] accessFlags=new byte[4];
        public byte[] superclassIdx=new byte[4];
        public byte[] interfacesOff=new byte[4];
        public byte[] sourceFileIdx=new byte[4];
        public byte[] annotationsOff=new byte[4];
        public byte[] classDataOff=new byte[4];
        public byte[] staticValuesOff=new byte[4];

    }


    /**
     * typedef struct DexClassDataItem{
     *     u4 staticFieldsSize;
     *     u4 instanceFieldsSize;
     *     u4 directMethodsSize;
     *     u4 virtualMethodsSize;
     * }
     */
    public class DexClassDataItem{
        public byte[] staticFieldsSize = new byte[5];
        public byte[] instanceFieldsSize = new byte[5];
        public byte[] directMethodsSize = new byte[5];
        public byte[] virtualMethodsSize = new byte[5];

    }

    public class DexCodeItem{
        short registers_size ;
        short ins_size ;
        short outs_size ;
        short tries_size ;
        int debug_info_off ;
        int insns_size;
        List<byte[]> insns ;

        public DexCodeItem(byte[] pBuff, int pOff) {
            registers_size = Utils.byte2Short_2(pBuff, pOff + 0);
            ins_size = Utils.byte2Short_2(pBuff, pOff + 2);
            outs_size = Utils.byte2Short_2(pBuff, pOff + 4);
            tries_size = Utils.byte2Short_2(pBuff, pOff + 6);
            debug_info_off = Utils.byte2Int_4(pBuff, pOff + 8);
            insns_size = Utils.byte2Int_4(pBuff, pOff + 12);
            insns = new ArrayList<>();

            System.out.printf("\tCodeItem:\t.registers:%d, ������������:%d, ���������������ʱ��Ҫ�IJ�������:%d, try_item����:%d, %d,%d\r\n", registers_size, ins_size, outs_size, tries_size, debug_info_off, insns_size);
            byte[] ttmp = new byte[insns_size*2];
            System.arraycopy(pBuff, pOff+16, ttmp, 0, ttmp.length);
            ParseDex.getOpcodeByIns2(ttmp);

//            for (int i=0; i<insns_size; i++){
//                byte[] tmp = new byte[2];
//                System.arraycopy(pBuff, pOff + 16+i*2, tmp, 0, 2);
//                insns.add(tmp);
////                System.out.printf("\t\t"+ParseDex.getOpcodeByIns2(tmp));
////                System.out.printf(": " + Utils.bytes2HexString(tmp) + "\r\n");
//            }
//            System.out.println("");

        }

        public int getSize_CodeItem(){
            return insns_size;
        }
    }

    /**
     * typedef struct DexField{
     *     u4 fieldIdx;
     *     u4 accessFlags;
     * }
     */
    public class DexField{
        public byte[] fieldIdx = new byte[5];
        public byte[] accessFlags = new byte[5];
    }

    /**
     * typedef struct DexMethod{
     *     u4 methodIdx;
     *     u4 accessFlags;
     *     u4 codoOff;
     * }
     */
    public class DexMethod{
        public byte[] methodIdx = new byte[5];
        public byte[] accessFlags = new byte[5];
        public byte[] codeOff = new byte[5];
    }

    /**
     * typedef struct DexClassData{
     *     DexClassDataItem header;
     *     DexField* staticFields;
     *     DexField* instanceFields;
     *     DexMethod* directMethods;
     *     DexMethod* virtualMethods
     * }
     */
    public class DexClassData{
        public ArrayList<DexClassDataItem> dexClassDataItems = new ArrayList<DexClassDataItem>();
        public ArrayList<DexField> staticFields = new ArrayList<DexField>();
        public ArrayList<DexField> instanceFields = new ArrayList<DexField>();
        public ArrayList<DexMethod> directMethods = new ArrayList<DexMethod>();
        public ArrayList<DexMethod> virtualMethods = new ArrayList<DexMethod>();
    }

    /**
     * typedef struct DexMapItem{
     *     u2 type;
     *     u2 unused;
     *     u4 size;
     *     u4 offset;
     * }
     */
    public class DexMapItem{
        public byte[] type=new byte[2];
        public byte[] unused=new byte[2];
        public byte[] size=new byte[4];
        public byte[] offset=new byte[4];
    }



    /**
     * typedef struct DexMapList{
     *     u4 size;
     *     DexMapItem list[11;
     * }
     */
    public class DexMapList{
        public byte[] size=new byte[4];
        public ArrayList<DexMapItem> list=new ArrayList<DexMapItem>();
        public Map<Integer, String> type_code = new HashMap<>();

        public DexMapList() {
            type_code.put(0x0000, "TYPE_HEADER_ITEM");
            type_code.put(0x0001, "TYPE_STRING_ID_ITEM");
            type_code.put(0x0002, "TYPE_TYPE_ID_ITEM");
            type_code.put(0x0003, "TYPE_PROTO_ID_ITEM");
            type_code.put(0x0004, "TYPE_FIELD_ID_ITEM");
            type_code.put(0x0005, "TYPE_METHOD_ID_ITEM");
            type_code.put(0x0006, "TYPE_CLASS_DEF_ITEM");
            type_code.put(0x1000, "TYPE_MAP_LIST");
            type_code.put(0x1001, "TYPE_TYPE_LIST");
            type_code.put(0x1002, "TYPE_ANNOTATION_SET_REF_LIST");
            type_code.put(0x1003, "TYPE_ANNOTATION_SET_ITEM");
            type_code.put(0x2000, "TYPE_CLASS_DATA_ITEM");
            type_code.put(0x2001, "TYPE_CODE_ITEM");
            type_code.put(0x2002, "TYPE_STRING_DATA_ITEM");
            type_code.put(0x2003, "TYPE_DEBUG_INFO_ITEM");
            type_code.put(0x2004, "TYPE_ANNOTATION_ITEM");
            type_code.put(0x2005, "TYPE_ENCODED_ARRAY_ITEM");
            type_code.put(0x2006, "TYPE_ANNOTATIONS_DIRECTORY_ITEM");
        }
    }
}

Main.java

package com.pediy.test;

public class Main {
    public static void main(String[] args) {
	    String dexPath = "HelloWorld.dex";
	    byte[] fileByteArrays = Utils.readFile(dexPath);
	    if (fileByteArrays == null){
	        System.out.println("read file filed");
	        return;
        }
	    ParseDex parseDex = new ParseDex(fileByteArrays);
	    parseDex.parse();
    }
}

ParseDex.java

package com.pediy.test;

import org.jf.dexlib2.Opcode;
import org.jf.dexlib2.Opcodes;

public class ParseDex {

    public static  byte[] byteData;
    private DexType dexType;


    public ParseDex(byte[] pArr) {
        byteData = pArr;
        dexType = new DexType();
    }


    public void parse(){
        parseHeader(0);
        printHeader();

        int stringOff = Utils.byte2Int_4(dexType.dexHeader.stringIdsOff, 0);
        int stringSize = Utils.byte2Int_4(dexType.dexHeader.stringIdsSize, 0);
        readDexStringId(stringOff, stringSize);
        printStrings();

        int typeOff = Utils.byte2Int_4(dexType.dexHeader.typeIdsOff, 0);
        int typeSize = Utils.byte2Int_4(dexType.dexHeader.typeIdsSize, 0);
        readDexTypeId(typeOff, typeSize);
        printTypes();

        int protoOff = Utils.byte2Int_4(dexType.dexHeader.protoIdsOff, 0);
        int protoSize = Utils.byte2Int_4(dexType.dexHeader.protoIdsSize, 0);
        readDexProtoId(protoOff, protoSize);

        int fieldOff = Utils.byte2Int_4(dexType.dexHeader.fieldIdsOff, 0);
        int fieldSize = Utils.byte2Int_4(dexType.dexHeader.fieldIdsSize, 0);
        readDexFieldId(fieldOff, fieldSize);

        int methodOff = Utils.byte2Int_4(dexType.dexHeader.methodIdsOff, 0);
        int methodSize = Utils.byte2Int_4(dexType.dexHeader.methodIdsSize, 0);
        readDexMethodId(methodOff, methodSize);

        int classOff = Utils.byte2Int_4(dexType.dexHeader.classDefsOff, 0);
        int classSize = Utils.byte2Int_4(dexType.dexHeader.classDefsSize, 0);
        readDexClassDefsId(classOff, classSize);

    }

    private String getStringById(int pId){
        return dexType.dexStringList.get(pId);
    }

    private String getTypeStringById(int pId){
        return dexType.dexTypeList.get(pId);
    }

    private String getProtoStringById(int pId){
        return dexType.dexProtoList.get(pId);
    }

    private String getFieldStringById(int pId){
        return dexType.dexFieldList.get(pId);
    }

    private String getMethodStringById(int pId){
        return dexType.dexMethodList.get(pId);
    }

    private void parseHeader(int offset){
        if (byteData == null){
            System.out.println("byteData is null");
        }

//        System.arraycopy(byteData, 0, dexType.dexHeader.magic, 0, dexType.dexHeader.magic.length);
//        System.arraycopy(byteData, 0+dexType.dexHeader.magic.length, dexType.dexHeader.checksum, 0, dexType.dexHeader.checksum.length);
//        System.arraycopy(byteData, 0+dexType.dexHeader.checksum.length, dexType.dexHeader.signature, 0, dexType.dexHeader.signature.length);

        int curPos = 0;
        for (int i=0; i< dexType.dexHeader.em.size(); i++){
            System.arraycopy(byteData, curPos, dexType.dexHeader.em.get(i), 0, dexType.dexHeader.em.get(i).length);
            curPos += dexType.dexHeader.em.get(i).length;
        }
    }

    private void printHeader(){
        System.out.printf("%-12s: %s\r\n", "magic", Utils.bytes2HexString(dexType.dexHeader.magic));
        System.out.printf("%-12s: %s\r\n", "checksum", Utils.bytes2HexString(dexType.dexHeader.checksum));
        System.out.printf("%-12s: %s\r\n", "signature", Utils.bytes2HexString(dexType.dexHeader.signature));
    }

    private void readDexStringId(int pOff, int pCount){
        for (int i=0; i<pCount; i++){
            DexType.DexStringId t_dexStringId = dexType.new DexStringId();
            System.arraycopy(byteData, pOff+i*4, t_dexStringId.stringDataOff, 0, t_dexStringId.stringDataOff.length);

            int dexStringId = Utils.byte2Int_4(t_dexStringId.stringDataOff, 0);
            Utils.RETULEB128 tmp = Utils.readULEB128(byteData, dexStringId);
            byte[] strContent = Utils.copyNewBytes(byteData, dexStringId+tmp.readSize, tmp.retValue);
            String realString = new String(strContent);

            dexType.dexStringId.add(t_dexStringId);
            dexType.dexStringList.add(realString);
        }
    }

    private void printStrings(){
        System.out.println("------------strings----------------");
        for (int i=0; i<dexType.dexStringList.size(); i++){
            System.out.println("\t" + dexType.dexStringList.get(i));
        }
    }

    private void readDexTypeId(int pOff, int pCount){
        for (int i=0; i<pCount; i++){
            DexType.DexTypeId t_dexTypeId = dexType.new DexTypeId();
            System.arraycopy(byteData, pOff+i*4, t_dexTypeId.descriptorIdx, 0, t_dexTypeId.descriptorIdx.length);

            int dexTypeId = Utils.byte2Int_4(t_dexTypeId.descriptorIdx, 0);
            dexType.dexTypeId.add(t_dexTypeId);
            dexType.dexTypeList.add(getStringById(dexTypeId));
        }
    }

    private void printTypes(){
        System.out.println("------------types----------------");
        for (String one:dexType.dexTypeList) {
            System.out.println("\t" + one);
        }
    }

    private void readDexProtoId(int pOff, int pCount){
        for (int i=0; i<pCount; i++){
            DexType.DexProtoId t_dexProtoId = dexType.new DexProtoId();
            System.arraycopy(byteData, pOff+12*i+0, t_dexProtoId.shortyIdx, 0, t_dexProtoId.shortyIdx.length);
            System.arraycopy(byteData, pOff+12*i+4, t_dexProtoId.returnTypeIdx, 0, t_dexProtoId.returnTypeIdx.length);
            System.arraycopy(byteData, pOff+12*i+8, t_dexProtoId.parametersOff, 0, t_dexProtoId.parametersOff.length);

            String pri = "";
            String shorty_string = getStringById(Utils.byte2Int_4(t_dexProtoId.shortyIdx, 0));
            String return_type_idx = getStringById(Utils.byte2Int_4(t_dexProtoId.returnTypeIdx, 0));
            pri += (shorty_string + ", ");
            pri += (return_type_idx + ", ");
            int parameters_Off = Utils.byte2Int_4(t_dexProtoId.parametersOff, 0);
            pri += "(";
            if (parameters_Off == 0){
                dexType.dexProtoId.add(t_dexProtoId);
                dexType.dexProtoList.add(getTypeStringById(Utils.byte2Int_4(t_dexProtoId.returnTypeIdx, 0)));
                pri += ")";
                continue;
            }

            int structCount = Utils.byte2Int_4(byteData, parameters_Off);
            for (int j=0; j<structCount; j++){
                DexType.DexTypeItem t_dexTypeItem = dexType.new DexTypeItem();
                System.arraycopy(byteData, parameters_Off+4+j*t_dexTypeItem.typeIdx.length, t_dexTypeItem.typeIdx, 0, t_dexTypeItem.typeIdx.length);

                int tmp = Utils.byte2Short_2(t_dexTypeItem.typeIdx, 0);
                String p = getTypeStringById(tmp);
                pri += (p + ", ");
            }

            pri += ")";
            System.out.println(pri);

            dexType.dexProtoId.add(t_dexProtoId);
            dexType.dexProtoList.add(getTypeStringById(Utils.byte2Int_4(t_dexProtoId.returnTypeIdx, 0)));
        }
    }

    private void readDexFieldId(int pOff, int pCount){
        System.out.println("------------fields----------------");
        for (int i=0; i<pCount; i++){
            DexType.DexFieldId t_dexFieldId = dexType.new DexFieldId();
            System.arraycopy(byteData, pOff+8*i+0, t_dexFieldId.classIdx, 0, t_dexFieldId.classIdx.length);
            System.arraycopy(byteData, pOff+8*i+2, t_dexFieldId.typeIdx, 0, t_dexFieldId.typeIdx.length);
            System.arraycopy(byteData, pOff+8*i+4, t_dexFieldId.nameIdx, 0, t_dexFieldId.nameIdx.length);

            int classIdx = Utils.byte2Short_2(t_dexFieldId.classIdx, 0);
            int typeIdx = Utils.byte2Short_2(t_dexFieldId.typeIdx, 0);
            int nameIdx = Utils.byte2Int_4(t_dexFieldId.nameIdx, 0);

            String pri = "";
            pri += ("class:"+getTypeStringById(classIdx) + ", type:" + getTypeStringById(typeIdx) + ", name:"+getStringById(nameIdx));
            System.out.println(pri);

            dexType.dexFieldId.add(t_dexFieldId);
            dexType.dexFieldList.add(getStringById(nameIdx));
        }
    }

    private void readDexMethodId(int pOff, int pCount){
        System.out.println("------------methods----------------");
        for (int i=0; i<pCount; i++){
            DexType.DexMethodId t_dexMethodId = dexType.new DexMethodId();
            System.arraycopy(byteData, pOff+8*i+0, t_dexMethodId.classIdx, 0, t_dexMethodId.classIdx.length);
            System.arraycopy(byteData, pOff+8*i+2, t_dexMethodId.protoIdx, 0, t_dexMethodId.protoIdx.length);
            System.arraycopy(byteData, pOff+8*i+4, t_dexMethodId.nameIdx, 0, t_dexMethodId.nameIdx.length);

            int classIdx = Utils.byte2Short_2(t_dexMethodId.classIdx, 0);
            int protoIdx = Utils.byte2Short_2(t_dexMethodId.protoIdx, 0);
            int nameIdx = Utils.byte2Int_4(t_dexMethodId.nameIdx, 0);

            String pri = "";
            pri += ("class:"+getTypeStringById(classIdx) + ", proto:" + getProtoStringById(protoIdx) + ", name:"+getStringById(nameIdx));
            System.out.println(pri);

            dexType.dexMethodId.add(t_dexMethodId);
            dexType.dexMethodList.add(getStringById(nameIdx));
        }
    }

    private void readDexClassDefsId(int pOff, int pCount){
        System.out.println("------------ClassDefs----------------");
        for (int i=0; i<pCount; i++){
            DexType.DexClassDef t_dexClassDef = dexType.new DexClassDef();
            System.arraycopy(byteData, pOff+i*32+0, t_dexClassDef.classIdx, 0, t_dexClassDef.classIdx.length);
            System.arraycopy(byteData, pOff+i*32+4, t_dexClassDef.accessFlags, 0, t_dexClassDef.accessFlags.length);
            System.arraycopy(byteData, pOff+i*32+8, t_dexClassDef.superclassIdx, 0, t_dexClassDef.superclassIdx.length);
            System.arraycopy(byteData, pOff+i*32+12, t_dexClassDef.interfacesOff, 0, t_dexClassDef.interfacesOff.length);
            System.arraycopy(byteData, pOff+i*32+16, t_dexClassDef.sourceFileIdx, 0, t_dexClassDef.sourceFileIdx.length);
            System.arraycopy(byteData, pOff+i*32+20, t_dexClassDef.annotationsOff, 0, t_dexClassDef.annotationsOff.length);
            System.arraycopy(byteData, pOff+i*32+24, t_dexClassDef.classDataOff, 0, t_dexClassDef.classDataOff.length);
            System.arraycopy(byteData, pOff+i*32+28, t_dexClassDef.staticValuesOff, 0, t_dexClassDef.staticValuesOff.length);

            int classIdx = Utils.byte2Int_4(t_dexClassDef.classIdx, 0);
            int accessFlags = Utils.byte2Int_4(t_dexClassDef.accessFlags, 0);
            int superclassIdx = Utils.byte2Int_4(t_dexClassDef.superclassIdx, 0);
            int interfacesOff = Utils.byte2Int_4(t_dexClassDef.interfacesOff, 0);
            int sourceFileIdx = Utils.byte2Int_4(t_dexClassDef.sourceFileIdx, 0);
            int annotationsOff = Utils.byte2Int_4(t_dexClassDef.annotationsOff, 0);
            int classDataOff = Utils.byte2Int_4(t_dexClassDef.classDataOff, 0);
            int staticValuesOff = Utils.byte2Int_4(t_dexClassDef.staticValuesOff, 0);

            String pri = "classIdx: " + getTypeStringById(classIdx) + "\r\naccessFlags: " + accessFlags + "\r\nsuperclassIdx: "
                    + getTypeStringById(superclassIdx) + "\r\ninterfacesOff: ";
            pri += (interfacesOff + "\r\nsourceFileIdx: " + getStringById(sourceFileIdx) + "\r\nannotationsOff: " + annotationsOff + "\r\nclassDataOff: ");
            pri += (classDataOff + "\r\nstaticValuesOff: " + staticValuesOff);
            System.out.println(pri);

            if (classDataOff == 0){
                continue;
            }

            int off = 0;
            Utils.RETULEB128 retuleb128 = null;

            retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
            int static_fields_size = retuleb128.retValue;
            off += retuleb128.readSize;

            retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
            int instance_fields_size = retuleb128.retValue;
            off += retuleb128.readSize;

            retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
            int direct_methods_size = retuleb128.retValue;
            off += retuleb128.readSize;

            retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
            int virtual_methods_size = retuleb128.retValue;
            off += retuleb128.readSize;

            System.out.println("static_fields_size:" + static_fields_size + ", ");
            for (int j=0; j<static_fields_size; j++){
                retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
                int field_idx_diff = retuleb128.retValue;
                off += retuleb128.readSize;

                retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
                int access_flags = retuleb128.retValue;
                off += retuleb128.readSize;

                System.out.println("\t" + getFieldStringById(field_idx_diff) + ", " + access_flags);
            }

            System.out.println("instance_fields_size:" + instance_fields_size + ", ");
            for (int j=0; j<static_fields_size; j++) {
                retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
                int field_idx_diff = retuleb128.retValue;
                off += retuleb128.readSize;

                retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
                int access_flags = retuleb128.retValue;
                off += retuleb128.readSize;

                System.out.println("\t" + getFieldStringById(field_idx_diff) + ", " + access_flags);
            }

            System.out.println("direct_methods_size:" + direct_methods_size + ", ");
            for (int j=0; j<direct_methods_size; j++) {
                retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
                int method_idx_diff = retuleb128.retValue;
                off += retuleb128.readSize;

                retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
                int access_flags = retuleb128.retValue;
                off += retuleb128.readSize;

                retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
                int code_off = retuleb128.retValue;
                off += retuleb128.readSize;

                if (code_off < 1)
                    continue;

                System.out.println("\t" + getMethodStringById(method_idx_diff) + ", " + access_flags);
                DexType.DexCodeItem t_dexCodeItem = dexType.new DexCodeItem(byteData, code_off);
            }

            System.out.println("virtual_methods_size:" + virtual_methods_size + ", ");
            for (int j=0; j<virtual_methods_size; j++) {
                retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
                int method_idx_diff = retuleb128.retValue;
                off += retuleb128.readSize;

                retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
                int access_flags = retuleb128.retValue;
                off += retuleb128.readSize;

                retuleb128 = Utils.readULEB128(byteData, classDataOff + off);
                int code_off = retuleb128.retValue;
                off += retuleb128.readSize;

                if (code_off < 1)
                    continue;

                System.out.println("\t" + getMethodStringById(method_idx_diff) + ", " + access_flags);
                DexType.DexCodeItem t_dexCodeItem = dexType.new DexCodeItem(byteData, code_off);
            }
        }
    }

    public static void getOpcodeByIns2(byte[] insns){
        //�����org.jf.dexlib2.dexbacked.instruction.DexBackedInstruction  public static Instruction readFrom(DexBackedDexFile dexFile, DexReader reader) {
        Opcode opcode = null;
        for (int insnsPosition=0; insnsPosition<insns.length; insnsPosition += (opcode.format.size/2*2)){
            try{
                int opcodeValue =  (insns[insnsPosition] & 255);
                if (opcodeValue == 0) {
                    opcodeValue = (insns[insnsPosition] & 255) | ((insns[insnsPosition + 1] & 255) << 8);
                }
                opcode = Opcodes.forApi(35).getOpcodeByValue(opcodeValue);
                byte[] tmp = new byte[opcode.format.size/2*2];
                System.arraycopy(insns, insnsPosition, tmp, 0, tmp.length);

                System.out.println("\t\t" + opcode.name + " : " + Utils.bytes2HexString(tmp));
                if (opcode.format.size < 1)
                    break;
            }catch (Exception ex){
                break;
            }
        }
    }
}

Utils.java

package com.pediy.test;

import java.io.*;

public final class Utils {

	public static String bytes2HexString(byte[] bytes){
		StringBuilder result = new StringBuilder();
		for(int i=0; i<bytes.length;i++){
			int t = bytes[i] & 0xff;
			String hex = Integer.toHexString(t).toUpperCase();
			if(hex.length() < 2){
				result.append("0"+hex);
			}else{
				result.append(hex);
			}
			result.append(" ");
		}
		return result.toString();

	}

	public static String bytes2HexStringBig(byte[] bytes){
		StringBuilder result = new StringBuilder();
		for(int i=0; i<bytes.length;i++){
			int t = bytes[i] & 0xff;
			String hex = Integer.toHexString(t).toUpperCase();
			if(hex.length() < 2){
				result.append("0"+hex);
			}else{
				result.append(hex);
			}
			result.append(" ");
		}
		return result.toString();

	}

	public static byte[] readFile(String fileName){
		File file = new File(fileName);
		FileInputStream fis = null;
		ByteArrayOutputStream bos = null;
		try{
			fis = new FileInputStream(file);
			bos = new ByteArrayOutputStream();
			byte[] temp = new byte[1024];
			int size = 0;
			while ((size = fis.read(temp)) != -1) {
				bos.write(temp, 0, size);
			}
			return bos.toByteArray();
		}catch(Exception e){
			System.out.println("read file error:"+e.toString());
		}finally{
			if(fis != null){
				try{
					fis.close();
				}catch(Exception e){
					System.out.println("close file error:"+e.toString());
				}
			}
			if(bos != null){
				try{
					bos.close();
				}catch(Exception e){
					System.out.println("close file error:"+e.toString());
				}
			}
		}
		return null;
	}

	public static byte[] copyNewBytes(byte[] addr,int start,int length){
		byte[] destByte = new byte[length];
		for(int i=0;i<length;i++){
			destByte[i] = addr[start+i];
		}
		return destByte;
	}

	public static int byte2Int_4(byte[] res, int pOff) {
		int targets = (res[pOff+0] & 0xff)
				| ((res[pOff+1] << 8) & 0xff00)
				| ((res[pOff+2] << 24) >>> 8)
				| (res[pOff+3] << 24);
		return targets;
	}

	public static short byte2Short_2(byte[] b, int pOff) {
		short s = 0;
		short s0 = (short) (b[pOff+0] & 0xff);// 最低位
		short s1 = (short) (b[pOff+1] & 0xff);
		s1 <<= 8;
		s = (short) (s0 | s1);
		return s;
	}


	static class RETULEB128{
		int retValue;
		int readSize;
	}

	public static RETULEB128 readULEB128(byte[] data, int pOff) {
		try{
			RETULEB128 ret = new RETULEB128();
			int result = 0;
			int shift = 0;
			int bytesRead = 0;
			int i = -1;

			while (true) {
				i++;
				if (pOff+i >= data.length)
					throw new IOException("pOff+i >= data.length");
				int currentByte = data[pOff + i];

				bytesRead++;
				result |= (currentByte & 0x7F) << shift;
				shift += 7;

				if ((currentByte & 0x80) == 0) {
					break;
				}
				if (bytesRead > 5) {
					throw new IOException("Invalid ULEB128 encoded data: more than 5 bytes");
				}
			}

			ret.retValue = result;
			ret.readSize = bytesRead;
			return ret;
		}catch (IOException ioe){
			ioe.printStackTrace();
		}
		return null;
	}


}

python脚本

import codecs

with codecs.open('a.txt', 'r', 'utf-8') as f:
    data = f.read()

    with codecs.open('file_gbk.txt', 'w', 'gbk') as f:
        f.write(data)