author | phh |
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/* |
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* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* - Neither the name of Oracle nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#ifndef LIBJIMAGE_IMAGEDECOMPRESSOR_HPP |
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#define LIBJIMAGE_IMAGEDECOMPRESSOR_HPP |
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#include <assert.h> |
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#include <string.h> |
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#include "imageFile.hpp" |
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#include "inttypes.hpp" |
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#include "jni.h" |
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/* |
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* Compressed resources located in image have an header. |
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* This header contains: |
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* - _magic: A magic u4, required to retrieved the header in the compressed content |
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* - _size: The size of the compressed resource. |
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* - _uncompressed_size: The uncompressed size of the compressed resource. |
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* - _decompressor_name_offset: The ImageDecompressor instance name StringsTable offset. |
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* - _decompressor_config_offset: StringsTable offset of configuration that could be needed by |
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* the decompressor in order to decompress. |
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* - _is_terminal: 1: the compressed content is terminal. Uncompressing it would |
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* create the actual resource. 0: the compressed content is not terminal. Uncompressing it |
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* will result in a compressed content to be decompressed (This occurs when a stack of compressors |
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* have been used to compress the resource. |
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*/ |
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struct ResourceHeader { |
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/* magic bytes that identifies a compressed resource header*/ |
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static const u4 resource_header_magic = 0xCAFEFAFA; |
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u4 _magic; // Resource header |
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u8 _size; // Resource size |
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u8 _uncompressed_size; // Expected uncompressed size |
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u4 _decompressor_name_offset; // Strings table decompressor offset |
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u4 _decompressor_config_offset; // Strings table config offset |
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u1 _is_terminal; // Last decompressor 1, otherwise 0. |
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}; |
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/* |
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* Resources located in jimage file can be compressed. Compression occurs at |
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* jimage file creation time. When compressed a resource is added an header that |
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* contains the name of the compressor that compressed it. |
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* Various compression strategies can be applied to compress a resource. |
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* The same resource can even be compressed multiple time by a stack of compressors. |
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* At runtime, a resource is decompressed in a loop until there is no more header |
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* meaning that the resource is equivalent to the not compressed resource. |
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* In each iteration, the name of the compressor located in the current header |
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* is used to retrieve the associated instance of ImageDecompressor. |
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* For example "zip" is the name of the compressor that compresses resources |
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* using the zip algorithm. The ZipDecompressor class name is also "zip". |
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* ImageDecompressor instances are retrieved from a static array in which |
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* they are registered. |
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*/ |
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class ImageDecompressor { |
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private: |
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const char* _name; |
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/* |
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* Array of concrete decompressors. This array is used to retrieve the decompressor |
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* that can handle resource decompression. |
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*/ |
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static ImageDecompressor** _decompressors; |
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/** |
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* Num of decompressors |
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*/ |
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static int _decompressors_num; |
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/* |
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* Identifier of a decompressor. This name is the identification key to retrieve |
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* decompressor from a resource header. |
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*/ |
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inline const char* get_name() const { return _name; } |
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static u8 getU8(u1* ptr, Endian *endian); |
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static u4 getU4(u1* ptr, Endian *endian); |
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protected: |
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ImageDecompressor(const char* name) : _name(name) { |
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} |
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virtual void decompress_resource(u1* data, u1* uncompressed, |
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ResourceHeader* header, const ImageStrings* strings) = 0; |
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public: |
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static void image_decompressor_init(); |
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static void image_decompressor_close(); |
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static ImageDecompressor* get_decompressor(const char * decompressor_name) ; |
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static void decompress_resource(u1* compressed, u1* uncompressed, |
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u8 uncompressed_size, const ImageStrings* strings, Endian* _endian); |
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}; |
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/** |
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* Zip decompressor. |
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*/ |
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class ZipDecompressor : public ImageDecompressor { |
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public: |
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ZipDecompressor(const char* sym) : ImageDecompressor(sym) { } |
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void decompress_resource(u1* data, u1* uncompressed, ResourceHeader* header, |
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const ImageStrings* strings); |
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static jboolean decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg); |
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}; |
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/* |
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* Shared Strings decompressor. This decompressor reconstruct the class |
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* constant pool UTF_U entries by retrieving strings stored in jimage strings table. |
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* In addition, if the UTF_8 entry is a descriptor, the descriptor has to be rebuilt, |
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* all java type having been removed from the descriptor and added to the sting table. |
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* eg: "(Ljava/lang/String;I)V" ==> "(L;I)V" and "java/lang", "String" |
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* stored in string table. offsets to the 2 strings are compressed and stored in the |
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* constantpool entry. |
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*/ |
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class SharedStringDecompressor : public ImageDecompressor { |
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private: |
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// the constant pool tag for UTF8 string located in strings table |
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static const int externalized_string = 23; |
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// the constant pool tag for UTF8 descriptors string located in strings table |
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static const int externalized_string_descriptor = 25; |
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// the constant pool tag for UTF8 |
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static const int constant_utf8 = 1; |
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// the constant pool tag for long |
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static const int constant_long = 5; |
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// the constant pool tag for double |
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static const int constant_double = 6; |
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// array index is the constant pool tag. value is size. |
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// eg: array[5] = 8; means size of long is 8 bytes. |
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static const u1 sizes[]; |
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// bit 5 and 6 are used to store the length of the compressed integer. |
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// size can be 1 (01), 2 (10), 3 (11). |
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// 0x60 ==> 0110000 |
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static const int compressed_index_size_mask = 0x60; |
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/* |
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* mask the length bits (5 and 6) and move to the right 5 bits. |
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*/ |
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inline static int get_compressed_length(char c) { |
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return ((char) (c & compressed_index_size_mask) >> 5); |
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} |
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inline static bool is_compressed(signed char b1) { return b1 < 0; } |
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static int decompress_int(unsigned char*& value); |
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public: |
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SharedStringDecompressor(const char* sym) : ImageDecompressor(sym){} |
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void decompress_resource(u1* data, u1* uncompressed, ResourceHeader* header, |
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const ImageStrings* strings); |
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}; |
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#endif // LIBJIMAGE_IMAGEDECOMPRESSOR_HPP |