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345 lines (300 loc) · 10.2 KB
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/*
* Copyright (C) 2006 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.
*/
//
// Zip archive entries.
//
// The ZipEntry class is tightly meshed with the ZipFile class.
//
#ifndef __LIBS_ZIPENTRY_H
#define __LIBS_ZIPENTRY_H
#include <utils/Errors.h>
#include <stdlib.h>
#include <stdio.h>
namespace android {
class ZipFile;
/*
* ZipEntry objects represent a single entry in a Zip archive.
*
* You can use one of these to get or set information about an entry, but
* there are no functions here for accessing the data itself. (We could
* tuck a pointer to the ZipFile in here for convenience, but that raises
* the likelihood of using ZipEntry objects after discarding the ZipFile.)
*
* File information is stored in two places: next to the file data (the Local
* File Header, and possibly a Data Descriptor), and at the end of the file
* (the Central Directory Entry). The two must be kept in sync.
*/
class ZipEntry {
public:
friend class ZipFile;
ZipEntry(void)
: mDeleted(false), mMarked(false)
{}
~ZipEntry(void) {}
/*
* Returns "true" if the data is compressed.
*/
bool isCompressed(void) const {
return mCDE.mCompressionMethod != kCompressStored;
}
int getCompressionMethod(void) const { return mCDE.mCompressionMethod; }
/*
* Return the uncompressed length.
*/
off_t getUncompressedLen(void) const { return mCDE.mUncompressedSize; }
/*
* Return the compressed length. For uncompressed data, this returns
* the same thing as getUncompresesdLen().
*/
off_t getCompressedLen(void) const { return mCDE.mCompressedSize; }
/*
* Return the absolute file offset of the start of the compressed or
* uncompressed data.
*/
off_t getFileOffset(void) const {
return mCDE.mLocalHeaderRelOffset +
LocalFileHeader::kLFHLen +
mLFH.mFileNameLength +
mLFH.mExtraFieldLength;
}
/*
* Return the data CRC.
*/
unsigned long getCRC32(void) const { return mCDE.mCRC32; }
/*
* Return file modification time in UNIX seconds-since-epoch.
*/
time_t getModWhen(void) const;
/*
* Return the archived file name.
*/
const char* getFileName(void) const { return (const char*) mCDE.mFileName; }
/*
* Application-defined "mark". Can be useful when synchronizing the
* contents of an archive with contents on disk.
*/
bool getMarked(void) const { return mMarked; }
void setMarked(bool val) { mMarked = val; }
/*
* Some basic functions for raw data manipulation. "LE" means
* Little Endian.
*/
static inline unsigned short getShortLE(const unsigned char* buf) {
return buf[0] | (buf[1] << 8);
}
static inline unsigned long getLongLE(const unsigned char* buf) {
return buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
}
static inline void putShortLE(unsigned char* buf, short val) {
buf[0] = (unsigned char) val;
buf[1] = (unsigned char) (val >> 8);
}
static inline void putLongLE(unsigned char* buf, long val) {
buf[0] = (unsigned char) val;
buf[1] = (unsigned char) (val >> 8);
buf[2] = (unsigned char) (val >> 16);
buf[3] = (unsigned char) (val >> 24);
}
/* defined for Zip archives */
enum {
kCompressStored = 0, // no compression
// shrunk = 1,
// reduced 1 = 2,
// reduced 2 = 3,
// reduced 3 = 4,
// reduced 4 = 5,
// imploded = 6,
// tokenized = 7,
kCompressDeflated = 8, // standard deflate
// Deflate64 = 9,
// lib imploded = 10,
// reserved = 11,
// bzip2 = 12,
};
/*
* Deletion flag. If set, the entry will be removed on the next
* call to "flush".
*/
bool getDeleted(void) const { return mDeleted; }
protected:
/*
* Initialize the structure from the file, which is pointing at
* our Central Directory entry.
*/
status_t initFromCDE(FILE* fp);
/*
* Initialize the structure for a new file. We need the filename
* and comment so that we can properly size the LFH area. The
* filename is mandatory, the comment is optional.
*/
void initNew(const char* fileName, const char* comment);
/*
* Initialize the structure with the contents of a ZipEntry from
* another file.
*/
status_t initFromExternal(const ZipFile* pZipFile, const ZipEntry* pEntry);
/*
* Add some pad bytes to the LFH. We do this by adding or resizing
* the "extra" field.
*/
status_t addPadding(int padding);
/*
* Set information about the data for this entry.
*/
void setDataInfo(long uncompLen, long compLen, unsigned long crc32,
int compressionMethod);
/*
* Set the modification date.
*/
void setModWhen(time_t when);
/*
* Return the offset of the local file header.
*/
off_t getLFHOffset(void) const { return mCDE.mLocalHeaderRelOffset; }
/*
* Set the offset of the local file header, relative to the start of
* the current file.
*/
void setLFHOffset(off_t offset) {
mCDE.mLocalHeaderRelOffset = (long) offset;
}
/* mark for deletion; used by ZipFile::remove() */
void setDeleted(void) { mDeleted = true; }
private:
/* these are private and not defined */
ZipEntry(const ZipEntry& src);
ZipEntry& operator=(const ZipEntry& src);
/* returns "true" if the CDE and the LFH agree */
bool compareHeaders(void) const;
void copyCDEtoLFH(void);
bool mDeleted; // set if entry is pending deletion
bool mMarked; // app-defined marker
/*
* Every entry in the Zip archive starts off with one of these.
*/
class LocalFileHeader {
public:
LocalFileHeader(void) :
mVersionToExtract(0),
mGPBitFlag(0),
mCompressionMethod(0),
mLastModFileTime(0),
mLastModFileDate(0),
mCRC32(0),
mCompressedSize(0),
mUncompressedSize(0),
mFileNameLength(0),
mExtraFieldLength(0),
mFileName(NULL),
mExtraField(NULL)
{}
virtual ~LocalFileHeader(void) {
delete[] mFileName;
delete[] mExtraField;
}
status_t read(FILE* fp);
status_t write(FILE* fp);
// unsigned long mSignature;
unsigned short mVersionToExtract;
unsigned short mGPBitFlag;
unsigned short mCompressionMethod;
unsigned short mLastModFileTime;
unsigned short mLastModFileDate;
unsigned long mCRC32;
unsigned long mCompressedSize;
unsigned long mUncompressedSize;
unsigned short mFileNameLength;
unsigned short mExtraFieldLength;
unsigned char* mFileName;
unsigned char* mExtraField;
enum {
kSignature = 0x04034b50,
kLFHLen = 30, // LocalFileHdr len, excl. var fields
};
void dump(void) const;
};
/*
* Every entry in the Zip archive has one of these in the "central
* directory" at the end of the file.
*/
class CentralDirEntry {
public:
CentralDirEntry(void) :
mVersionMadeBy(0),
mVersionToExtract(0),
mGPBitFlag(0),
mCompressionMethod(0),
mLastModFileTime(0),
mLastModFileDate(0),
mCRC32(0),
mCompressedSize(0),
mUncompressedSize(0),
mFileNameLength(0),
mExtraFieldLength(0),
mFileCommentLength(0),
mDiskNumberStart(0),
mInternalAttrs(0),
mExternalAttrs(0),
mLocalHeaderRelOffset(0),
mFileName(NULL),
mExtraField(NULL),
mFileComment(NULL)
{}
virtual ~CentralDirEntry(void) {
delete[] mFileName;
delete[] mExtraField;
delete[] mFileComment;
}
status_t read(FILE* fp);
status_t write(FILE* fp);
// unsigned long mSignature;
unsigned short mVersionMadeBy;
unsigned short mVersionToExtract;
unsigned short mGPBitFlag;
unsigned short mCompressionMethod;
unsigned short mLastModFileTime;
unsigned short mLastModFileDate;
unsigned long mCRC32;
unsigned long mCompressedSize;
unsigned long mUncompressedSize;
unsigned short mFileNameLength;
unsigned short mExtraFieldLength;
unsigned short mFileCommentLength;
unsigned short mDiskNumberStart;
unsigned short mInternalAttrs;
unsigned long mExternalAttrs;
unsigned long mLocalHeaderRelOffset;
unsigned char* mFileName;
unsigned char* mExtraField;
unsigned char* mFileComment;
void dump(void) const;
enum {
kSignature = 0x02014b50,
kCDELen = 46, // CentralDirEnt len, excl. var fields
};
};
enum {
//kDataDescriptorSignature = 0x08074b50, // currently unused
kDataDescriptorLen = 16, // four 32-bit fields
kDefaultVersion = 20, // need deflate, nothing much else
kDefaultMadeBy = 0x0317, // 03=UNIX, 17=spec v2.3
kUsesDataDescr = 0x0008, // GPBitFlag bit 3
};
LocalFileHeader mLFH;
CentralDirEntry mCDE;
};
}; // namespace android
#endif // __LIBS_ZIPENTRY_H
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