fb2a9467ad
The Local File Header (LFH) offset is printed in debugging cases when the platform is inspecting APKs. This adds the LFH offset field to the list of contents of an APK, so that it can be checked easily against the Central Directory (CD). Change-Id: I08f9a13256bfe6563c1a963c4f0289789b2e7857
346 lines
10 KiB
C++
346 lines
10 KiB
C++
/*
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* Copyright (C) 2006 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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//
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// Zip archive entries.
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//
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// The ZipEntry class is tightly meshed with the ZipFile class.
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//
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#ifndef __LIBS_ZIPENTRY_H
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#define __LIBS_ZIPENTRY_H
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#include <utils/Errors.h>
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#include <stdlib.h>
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#include <stdio.h>
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namespace android {
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class ZipFile;
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/*
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* ZipEntry objects represent a single entry in a Zip archive.
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*
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* You can use one of these to get or set information about an entry, but
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* there are no functions here for accessing the data itself. (We could
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* tuck a pointer to the ZipFile in here for convenience, but that raises
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* the likelihood of using ZipEntry objects after discarding the ZipFile.)
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*
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* File information is stored in two places: next to the file data (the Local
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* File Header, and possibly a Data Descriptor), and at the end of the file
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* (the Central Directory Entry). The two must be kept in sync.
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*/
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class ZipEntry {
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public:
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friend class ZipFile;
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ZipEntry(void)
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: mDeleted(false), mMarked(false)
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{}
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~ZipEntry(void) {}
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/*
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* Returns "true" if the data is compressed.
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*/
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bool isCompressed(void) const {
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return mCDE.mCompressionMethod != kCompressStored;
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}
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int getCompressionMethod(void) const { return mCDE.mCompressionMethod; }
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/*
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* Return the uncompressed length.
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*/
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off_t getUncompressedLen(void) const { return mCDE.mUncompressedSize; }
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/*
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* Return the compressed length. For uncompressed data, this returns
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* the same thing as getUncompresesdLen().
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*/
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off_t getCompressedLen(void) const { return mCDE.mCompressedSize; }
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/*
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* Return the offset of the local file header.
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*/
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off_t getLFHOffset(void) const { return mCDE.mLocalHeaderRelOffset; }
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/*
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* Return the absolute file offset of the start of the compressed or
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* uncompressed data.
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*/
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off_t getFileOffset(void) const {
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return mCDE.mLocalHeaderRelOffset +
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LocalFileHeader::kLFHLen +
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mLFH.mFileNameLength +
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mLFH.mExtraFieldLength;
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}
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/*
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* Return the data CRC.
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*/
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unsigned long getCRC32(void) const { return mCDE.mCRC32; }
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/*
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* Return file modification time in UNIX seconds-since-epoch.
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*/
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time_t getModWhen(void) const;
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/*
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* Return the archived file name.
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*/
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const char* getFileName(void) const { return (const char*) mCDE.mFileName; }
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/*
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* Application-defined "mark". Can be useful when synchronizing the
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* contents of an archive with contents on disk.
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*/
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bool getMarked(void) const { return mMarked; }
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void setMarked(bool val) { mMarked = val; }
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/*
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* Some basic functions for raw data manipulation. "LE" means
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* Little Endian.
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*/
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static inline unsigned short getShortLE(const unsigned char* buf) {
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return buf[0] | (buf[1] << 8);
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}
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static inline unsigned long getLongLE(const unsigned char* buf) {
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return buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
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}
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static inline void putShortLE(unsigned char* buf, short val) {
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buf[0] = (unsigned char) val;
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buf[1] = (unsigned char) (val >> 8);
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}
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static inline void putLongLE(unsigned char* buf, long val) {
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buf[0] = (unsigned char) val;
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buf[1] = (unsigned char) (val >> 8);
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buf[2] = (unsigned char) (val >> 16);
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buf[3] = (unsigned char) (val >> 24);
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}
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/* defined for Zip archives */
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enum {
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kCompressStored = 0, // no compression
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// shrunk = 1,
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// reduced 1 = 2,
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// reduced 2 = 3,
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// reduced 3 = 4,
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// reduced 4 = 5,
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// imploded = 6,
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// tokenized = 7,
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kCompressDeflated = 8, // standard deflate
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// Deflate64 = 9,
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// lib imploded = 10,
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// reserved = 11,
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// bzip2 = 12,
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};
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/*
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* Deletion flag. If set, the entry will be removed on the next
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* call to "flush".
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*/
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bool getDeleted(void) const { return mDeleted; }
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protected:
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/*
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* Initialize the structure from the file, which is pointing at
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* our Central Directory entry.
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*/
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status_t initFromCDE(FILE* fp);
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/*
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* Initialize the structure for a new file. We need the filename
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* and comment so that we can properly size the LFH area. The
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* filename is mandatory, the comment is optional.
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*/
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void initNew(const char* fileName, const char* comment);
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/*
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* Initialize the structure with the contents of a ZipEntry from
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* another file.
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*/
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status_t initFromExternal(const ZipFile* pZipFile, const ZipEntry* pEntry);
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/*
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* Add some pad bytes to the LFH. We do this by adding or resizing
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* the "extra" field.
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*/
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status_t addPadding(int padding);
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/*
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* Set information about the data for this entry.
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*/
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void setDataInfo(long uncompLen, long compLen, unsigned long crc32,
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int compressionMethod);
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/*
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* Set the modification date.
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*/
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void setModWhen(time_t when);
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/*
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* Set the offset of the local file header, relative to the start of
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* the current file.
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*/
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void setLFHOffset(off_t offset) {
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mCDE.mLocalHeaderRelOffset = (long) offset;
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}
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/* mark for deletion; used by ZipFile::remove() */
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void setDeleted(void) { mDeleted = true; }
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private:
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/* these are private and not defined */
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ZipEntry(const ZipEntry& src);
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ZipEntry& operator=(const ZipEntry& src);
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/* returns "true" if the CDE and the LFH agree */
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bool compareHeaders(void) const;
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void copyCDEtoLFH(void);
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bool mDeleted; // set if entry is pending deletion
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bool mMarked; // app-defined marker
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/*
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* Every entry in the Zip archive starts off with one of these.
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*/
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class LocalFileHeader {
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public:
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LocalFileHeader(void) :
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mVersionToExtract(0),
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mGPBitFlag(0),
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mCompressionMethod(0),
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mLastModFileTime(0),
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mLastModFileDate(0),
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mCRC32(0),
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mCompressedSize(0),
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mUncompressedSize(0),
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mFileNameLength(0),
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mExtraFieldLength(0),
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mFileName(NULL),
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mExtraField(NULL)
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{}
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virtual ~LocalFileHeader(void) {
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delete[] mFileName;
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delete[] mExtraField;
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}
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status_t read(FILE* fp);
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status_t write(FILE* fp);
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// unsigned long mSignature;
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unsigned short mVersionToExtract;
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unsigned short mGPBitFlag;
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unsigned short mCompressionMethod;
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unsigned short mLastModFileTime;
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unsigned short mLastModFileDate;
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unsigned long mCRC32;
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unsigned long mCompressedSize;
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unsigned long mUncompressedSize;
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unsigned short mFileNameLength;
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unsigned short mExtraFieldLength;
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unsigned char* mFileName;
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unsigned char* mExtraField;
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enum {
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kSignature = 0x04034b50,
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kLFHLen = 30, // LocalFileHdr len, excl. var fields
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};
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void dump(void) const;
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};
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/*
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* Every entry in the Zip archive has one of these in the "central
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* directory" at the end of the file.
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*/
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class CentralDirEntry {
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public:
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CentralDirEntry(void) :
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mVersionMadeBy(0),
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mVersionToExtract(0),
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mGPBitFlag(0),
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mCompressionMethod(0),
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mLastModFileTime(0),
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mLastModFileDate(0),
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mCRC32(0),
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mCompressedSize(0),
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mUncompressedSize(0),
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mFileNameLength(0),
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mExtraFieldLength(0),
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mFileCommentLength(0),
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mDiskNumberStart(0),
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mInternalAttrs(0),
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mExternalAttrs(0),
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mLocalHeaderRelOffset(0),
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mFileName(NULL),
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mExtraField(NULL),
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mFileComment(NULL)
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{}
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virtual ~CentralDirEntry(void) {
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delete[] mFileName;
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delete[] mExtraField;
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delete[] mFileComment;
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}
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status_t read(FILE* fp);
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status_t write(FILE* fp);
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// unsigned long mSignature;
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unsigned short mVersionMadeBy;
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unsigned short mVersionToExtract;
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unsigned short mGPBitFlag;
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unsigned short mCompressionMethod;
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unsigned short mLastModFileTime;
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unsigned short mLastModFileDate;
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unsigned long mCRC32;
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unsigned long mCompressedSize;
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unsigned long mUncompressedSize;
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unsigned short mFileNameLength;
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unsigned short mExtraFieldLength;
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unsigned short mFileCommentLength;
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unsigned short mDiskNumberStart;
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unsigned short mInternalAttrs;
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unsigned long mExternalAttrs;
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unsigned long mLocalHeaderRelOffset;
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unsigned char* mFileName;
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unsigned char* mExtraField;
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unsigned char* mFileComment;
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void dump(void) const;
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enum {
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kSignature = 0x02014b50,
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kCDELen = 46, // CentralDirEnt len, excl. var fields
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};
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};
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enum {
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//kDataDescriptorSignature = 0x08074b50, // currently unused
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kDataDescriptorLen = 16, // four 32-bit fields
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kDefaultVersion = 20, // need deflate, nothing much else
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kDefaultMadeBy = 0x0317, // 03=UNIX, 17=spec v2.3
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kUsesDataDescr = 0x0008, // GPBitFlag bit 3
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};
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LocalFileHeader mLFH;
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CentralDirEntry mCDE;
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};
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}; // namespace android
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#endif // __LIBS_ZIPENTRY_H
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