346 lines
10 KiB
C
346 lines
10 KiB
C
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/*
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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 "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 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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* 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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* 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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