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108 lines
3.0 KiB
108 lines
3.0 KiB
4 months ago
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "slicer/dex_format.h"
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#include "slicer/common.h"
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#include <zlib.h>
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#include <sstream>
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namespace dex {
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// Compute the DEX file checksum for a memory-mapped DEX file
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u4 ComputeChecksum(const Header* header) {
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const u1* start = reinterpret_cast<const u1*>(header);
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uLong adler = adler32(0L, Z_NULL, 0);
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const int non_sum = sizeof(header->magic) + sizeof(header->checksum);
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return static_cast<u4>(
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adler32(adler, start + non_sum, header->file_size - non_sum));
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}
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// Returns the human-readable name for a primitive type
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static const char* PrimitiveTypeName(char type_char) {
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switch (type_char) {
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case 'B': return "byte";
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case 'C': return "char";
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case 'D': return "double";
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case 'F': return "float";
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case 'I': return "int";
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case 'J': return "long";
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case 'S': return "short";
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case 'V': return "void";
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case 'Z': return "boolean";
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}
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SLICER_CHECK(!"unexpected type");
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return nullptr;
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}
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// Converts a type descriptor to human-readable "dotted" form. For
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// example, "Ljava/lang/String;" becomes "java.lang.String", and
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// "[I" becomes "int[]".
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std::string DescriptorToDecl(const char* descriptor) {
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std::stringstream ss;
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int array_dimensions = 0;
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while (*descriptor == '[') {
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++array_dimensions;
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++descriptor;
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}
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if (*descriptor == 'L') {
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for (++descriptor; *descriptor != ';'; ++descriptor) {
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SLICER_CHECK(*descriptor != '\0');
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ss << (*descriptor == '/' ? '.' : *descriptor);
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}
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} else {
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ss << PrimitiveTypeName(*descriptor);
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}
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SLICER_CHECK(descriptor[1] == '\0');
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// add the array brackets
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for (int i = 0; i < array_dimensions; ++i) {
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ss << "[]";
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}
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return ss.str();
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}
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// Converts a type descriptor to a single "shorty" char
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// (ex. "LFoo;" and "[[I" become 'L', "I" stays 'I')
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char DescriptorToShorty(const char* descriptor) {
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// skip array dimensions
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int array_dimensions = 0;
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while (*descriptor == '[') {
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++array_dimensions;
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++descriptor;
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}
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char short_descriptor = *descriptor;
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if (short_descriptor == 'L') {
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// skip the full class name
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for(; *descriptor && *descriptor != ';'; ++descriptor);
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SLICER_CHECK(*descriptor == ';');
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}
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SLICER_CHECK(descriptor[1] == '\0');
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SLICER_CHECK(short_descriptor == 'L' || PrimitiveTypeName(short_descriptor) != nullptr);
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return array_dimensions > 0 ? 'L' : short_descriptor;
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}
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} // namespace dex
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