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ZipEntry.cpp
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736 lines (643 loc) · 22.1 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.
*/
//
// Access to entries in a Zip archive.
//
#define LOG_TAG "zip"
#include "ZipEntry.h"
#include <utils/Log.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
using namespace android;
/*
* Initialize a new ZipEntry structure from a FILE* positioned at a
* CentralDirectoryEntry.
*
* On exit, the file pointer will be at the start of the next CDE or
* at the EOCD.
*/
status_t ZipEntry::initFromCDE(FILE* fp)
{
status_t result;
long posn;
bool hasDD;
//ALOGV("initFromCDE ---\n");
/* read the CDE */
result = mCDE.read(fp);
if (result != NO_ERROR) {
ALOGD("mCDE.read failed\n");
return result;
}
//mCDE.dump();
/* using the info in the CDE, go load up the LFH */
posn = ftell(fp);
if (fseek(fp, mCDE.mLocalHeaderRelOffset, SEEK_SET) != 0) {
ALOGD("local header seek failed (%ld)\n",
mCDE.mLocalHeaderRelOffset);
return UNKNOWN_ERROR;
}
result = mLFH.read(fp);
if (result != NO_ERROR) {
ALOGD("mLFH.read failed\n");
return result;
}
if (fseek(fp, posn, SEEK_SET) != 0)
return UNKNOWN_ERROR;
//mLFH.dump();
/*
* We *might* need to read the Data Descriptor at this point and
* integrate it into the LFH. If this bit is set, the CRC-32,
* compressed size, and uncompressed size will be zero. In practice
* these seem to be rare.
*/
hasDD = (mLFH.mGPBitFlag & kUsesDataDescr) != 0;
if (hasDD) {
// do something clever
//ALOGD("+++ has data descriptor\n");
}
/*
* Sanity-check the LFH. Note that this will fail if the "kUsesDataDescr"
* flag is set, because the LFH is incomplete. (Not a problem, since we
* prefer the CDE values.)
*/
if (!hasDD && !compareHeaders()) {
ALOGW("warning: header mismatch\n");
// keep going?
}
/*
* If the mVersionToExtract is greater than 20, we may have an
* issue unpacking the record -- could be encrypted, compressed
* with something we don't support, or use Zip64 extensions. We
* can defer worrying about that to when we're extracting data.
*/
return NO_ERROR;
}
/*
* Initialize a new entry. Pass in the file name and an optional comment.
*
* Initializes the CDE and the LFH.
*/
void ZipEntry::initNew(const char* fileName, const char* comment)
{
assert(fileName != NULL && *fileName != '\0'); // name required
/* most fields are properly initialized by constructor */
mCDE.mVersionMadeBy = kDefaultMadeBy;
mCDE.mVersionToExtract = kDefaultVersion;
mCDE.mCompressionMethod = kCompressStored;
mCDE.mFileNameLength = strlen(fileName);
if (comment != NULL)
mCDE.mFileCommentLength = strlen(comment);
mCDE.mExternalAttrs = 0x81b60020; // matches what WinZip does
if (mCDE.mFileNameLength > 0) {
mCDE.mFileName = new unsigned char[mCDE.mFileNameLength+1];
strcpy((char*) mCDE.mFileName, fileName);
}
if (mCDE.mFileCommentLength > 0) {
/* TODO: stop assuming null-terminated ASCII here? */
mCDE.mFileComment = new unsigned char[mCDE.mFileCommentLength+1];
strcpy((char*) mCDE.mFileComment, comment);
}
copyCDEtoLFH();
}
/*
* Initialize a new entry, starting with the ZipEntry from a different
* archive.
*
* Initializes the CDE and the LFH.
*/
status_t ZipEntry::initFromExternal(const ZipFile* /* pZipFile */,
const ZipEntry* pEntry)
{
mCDE = pEntry->mCDE;
// Check whether we got all the memory needed.
if ((mCDE.mFileNameLength > 0 && mCDE.mFileName == NULL) ||
(mCDE.mFileCommentLength > 0 && mCDE.mFileComment == NULL) ||
(mCDE.mExtraFieldLength > 0 && mCDE.mExtraField == NULL)) {
return NO_MEMORY;
}
/* construct the LFH from the CDE */
copyCDEtoLFH();
/*
* The LFH "extra" field is independent of the CDE "extra", so we
* handle it here.
*/
assert(mLFH.mExtraField == NULL);
mLFH.mExtraFieldLength = pEntry->mLFH.mExtraFieldLength;
if (mLFH.mExtraFieldLength > 0) {
mLFH.mExtraField = new unsigned char[mLFH.mExtraFieldLength+1];
if (mLFH.mExtraField == NULL)
return NO_MEMORY;
memcpy(mLFH.mExtraField, pEntry->mLFH.mExtraField,
mLFH.mExtraFieldLength+1);
}
return NO_ERROR;
}
/*
* Insert pad bytes in the LFH by tweaking the "extra" field. This will
* potentially confuse something that put "extra" data in here earlier,
* but I can't find an actual problem.
*/
status_t ZipEntry::addPadding(int padding)
{
if (padding <= 0)
return INVALID_OPERATION;
//ALOGI("HEY: adding %d pad bytes to existing %d in %s\n",
// padding, mLFH.mExtraFieldLength, mCDE.mFileName);
if (mLFH.mExtraFieldLength > 0) {
/* extend existing field */
unsigned char* newExtra;
newExtra = new unsigned char[mLFH.mExtraFieldLength + padding];
if (newExtra == NULL)
return NO_MEMORY;
memset(newExtra + mLFH.mExtraFieldLength, 0, padding);
memcpy(newExtra, mLFH.mExtraField, mLFH.mExtraFieldLength);
delete[] mLFH.mExtraField;
mLFH.mExtraField = newExtra;
mLFH.mExtraFieldLength += padding;
} else {
/* create new field */
mLFH.mExtraField = new unsigned char[padding];
memset(mLFH.mExtraField, 0, padding);
mLFH.mExtraFieldLength = padding;
}
return NO_ERROR;
}
/*
* Set the fields in the LFH equal to the corresponding fields in the CDE.
*
* This does not touch the LFH "extra" field.
*/
void ZipEntry::copyCDEtoLFH(void)
{
mLFH.mVersionToExtract = mCDE.mVersionToExtract;
mLFH.mGPBitFlag = mCDE.mGPBitFlag;
mLFH.mCompressionMethod = mCDE.mCompressionMethod;
mLFH.mLastModFileTime = mCDE.mLastModFileTime;
mLFH.mLastModFileDate = mCDE.mLastModFileDate;
mLFH.mCRC32 = mCDE.mCRC32;
mLFH.mCompressedSize = mCDE.mCompressedSize;
mLFH.mUncompressedSize = mCDE.mUncompressedSize;
mLFH.mFileNameLength = mCDE.mFileNameLength;
// the "extra field" is independent
delete[] mLFH.mFileName;
if (mLFH.mFileNameLength > 0) {
mLFH.mFileName = new unsigned char[mLFH.mFileNameLength+1];
strcpy((char*) mLFH.mFileName, (const char*) mCDE.mFileName);
} else {
mLFH.mFileName = NULL;
}
}
/*
* Set some information about a file after we add it.
*/
void ZipEntry::setDataInfo(long uncompLen, long compLen, unsigned long crc32,
int compressionMethod)
{
mCDE.mCompressionMethod = compressionMethod;
mCDE.mCRC32 = crc32;
mCDE.mCompressedSize = compLen;
mCDE.mUncompressedSize = uncompLen;
mCDE.mCompressionMethod = compressionMethod;
if (compressionMethod == kCompressDeflated) {
mCDE.mGPBitFlag |= 0x0002; // indicates maximum compression used
}
copyCDEtoLFH();
}
/*
* See if the data in mCDE and mLFH match up. This is mostly useful for
* debugging these classes, but it can be used to identify damaged
* archives.
*
* Returns "false" if they differ.
*/
bool ZipEntry::compareHeaders(void) const
{
if (mCDE.mVersionToExtract != mLFH.mVersionToExtract) {
ALOGV("cmp: VersionToExtract\n");
return false;
}
if (mCDE.mGPBitFlag != mLFH.mGPBitFlag) {
ALOGV("cmp: GPBitFlag\n");
return false;
}
if (mCDE.mCompressionMethod != mLFH.mCompressionMethod) {
ALOGV("cmp: CompressionMethod\n");
return false;
}
if (mCDE.mLastModFileTime != mLFH.mLastModFileTime) {
ALOGV("cmp: LastModFileTime\n");
return false;
}
if (mCDE.mLastModFileDate != mLFH.mLastModFileDate) {
ALOGV("cmp: LastModFileDate\n");
return false;
}
if (mCDE.mCRC32 != mLFH.mCRC32) {
ALOGV("cmp: CRC32\n");
return false;
}
if (mCDE.mCompressedSize != mLFH.mCompressedSize) {
ALOGV("cmp: CompressedSize\n");
return false;
}
if (mCDE.mUncompressedSize != mLFH.mUncompressedSize) {
ALOGV("cmp: UncompressedSize\n");
return false;
}
if (mCDE.mFileNameLength != mLFH.mFileNameLength) {
ALOGV("cmp: FileNameLength\n");
return false;
}
#if 0 // this seems to be used for padding, not real data
if (mCDE.mExtraFieldLength != mLFH.mExtraFieldLength) {
ALOGV("cmp: ExtraFieldLength\n");
return false;
}
#endif
if (mCDE.mFileName != NULL) {
if (strcmp((char*) mCDE.mFileName, (char*) mLFH.mFileName) != 0) {
ALOGV("cmp: FileName\n");
return false;
}
}
return true;
}
/*
* Convert the DOS date/time stamp into a UNIX time stamp.
*/
time_t ZipEntry::getModWhen(void) const
{
struct tm parts;
parts.tm_sec = (mCDE.mLastModFileTime & 0x001f) << 1;
parts.tm_min = (mCDE.mLastModFileTime & 0x07e0) >> 5;
parts.tm_hour = (mCDE.mLastModFileTime & 0xf800) >> 11;
parts.tm_mday = (mCDE.mLastModFileDate & 0x001f);
parts.tm_mon = ((mCDE.mLastModFileDate & 0x01e0) >> 5) -1;
parts.tm_year = ((mCDE.mLastModFileDate & 0xfe00) >> 9) + 80;
parts.tm_wday = parts.tm_yday = 0;
parts.tm_isdst = -1; // DST info "not available"
return mktime(&parts);
}
/*
* Set the CDE/LFH timestamp from UNIX time.
*/
void ZipEntry::setModWhen(time_t when)
{
#if !defined(_WIN32)
struct tm tmResult;
#endif
time_t even;
unsigned short zdate, ztime;
struct tm* ptm;
/* round up to an even number of seconds */
even = (time_t)(((unsigned long)(when) + 1) & (~1));
/* expand */
#if !defined(_WIN32)
ptm = localtime_r(&even, &tmResult);
#else
ptm = localtime(&even);
#endif
int year;
year = ptm->tm_year;
if (year < 80)
year = 80;
zdate = (year - 80) << 9 | (ptm->tm_mon+1) << 5 | ptm->tm_mday;
ztime = ptm->tm_hour << 11 | ptm->tm_min << 5 | ptm->tm_sec >> 1;
mCDE.mLastModFileTime = mLFH.mLastModFileTime = ztime;
mCDE.mLastModFileDate = mLFH.mLastModFileDate = zdate;
}
/*
* ===========================================================================
* ZipEntry::LocalFileHeader
* ===========================================================================
*/
/*
* Read a local file header.
*
* On entry, "fp" points to the signature at the start of the header.
* On exit, "fp" points to the start of data.
*/
status_t ZipEntry::LocalFileHeader::read(FILE* fp)
{
status_t result = NO_ERROR;
unsigned char buf[kLFHLen];
assert(mFileName == NULL);
assert(mExtraField == NULL);
if (fread(buf, 1, kLFHLen, fp) != kLFHLen) {
result = UNKNOWN_ERROR;
goto bail;
}
if (ZipEntry::getLongLE(&buf[0x00]) != kSignature) {
ALOGD("whoops: didn't find expected signature\n");
result = UNKNOWN_ERROR;
goto bail;
}
mVersionToExtract = ZipEntry::getShortLE(&buf[0x04]);
mGPBitFlag = ZipEntry::getShortLE(&buf[0x06]);
mCompressionMethod = ZipEntry::getShortLE(&buf[0x08]);
mLastModFileTime = ZipEntry::getShortLE(&buf[0x0a]);
mLastModFileDate = ZipEntry::getShortLE(&buf[0x0c]);
mCRC32 = ZipEntry::getLongLE(&buf[0x0e]);
mCompressedSize = ZipEntry::getLongLE(&buf[0x12]);
mUncompressedSize = ZipEntry::getLongLE(&buf[0x16]);
mFileNameLength = ZipEntry::getShortLE(&buf[0x1a]);
mExtraFieldLength = ZipEntry::getShortLE(&buf[0x1c]);
// TODO: validate sizes
/* grab filename */
if (mFileNameLength != 0) {
mFileName = new unsigned char[mFileNameLength+1];
if (mFileName == NULL) {
result = NO_MEMORY;
goto bail;
}
if (fread(mFileName, 1, mFileNameLength, fp) != mFileNameLength) {
result = UNKNOWN_ERROR;
goto bail;
}
mFileName[mFileNameLength] = '\0';
}
/* grab extra field */
if (mExtraFieldLength != 0) {
mExtraField = new unsigned char[mExtraFieldLength+1];
if (mExtraField == NULL) {
result = NO_MEMORY;
goto bail;
}
if (fread(mExtraField, 1, mExtraFieldLength, fp) != mExtraFieldLength) {
result = UNKNOWN_ERROR;
goto bail;
}
mExtraField[mExtraFieldLength] = '\0';
}
bail:
return result;
}
/*
* Write a local file header.
*/
status_t ZipEntry::LocalFileHeader::write(FILE* fp)
{
unsigned char buf[kLFHLen];
ZipEntry::putLongLE(&buf[0x00], kSignature);
ZipEntry::putShortLE(&buf[0x04], mVersionToExtract);
ZipEntry::putShortLE(&buf[0x06], mGPBitFlag);
ZipEntry::putShortLE(&buf[0x08], mCompressionMethod);
ZipEntry::putShortLE(&buf[0x0a], mLastModFileTime);
ZipEntry::putShortLE(&buf[0x0c], mLastModFileDate);
ZipEntry::putLongLE(&buf[0x0e], mCRC32);
ZipEntry::putLongLE(&buf[0x12], mCompressedSize);
ZipEntry::putLongLE(&buf[0x16], mUncompressedSize);
ZipEntry::putShortLE(&buf[0x1a], mFileNameLength);
ZipEntry::putShortLE(&buf[0x1c], mExtraFieldLength);
if (fwrite(buf, 1, kLFHLen, fp) != kLFHLen)
return UNKNOWN_ERROR;
/* write filename */
if (mFileNameLength != 0) {
if (fwrite(mFileName, 1, mFileNameLength, fp) != mFileNameLength)
return UNKNOWN_ERROR;
}
/* write "extra field" */
if (mExtraFieldLength != 0) {
if (fwrite(mExtraField, 1, mExtraFieldLength, fp) != mExtraFieldLength)
return UNKNOWN_ERROR;
}
return NO_ERROR;
}
/*
* Dump the contents of a LocalFileHeader object.
*/
void ZipEntry::LocalFileHeader::dump(void) const
{
ALOGD(" LocalFileHeader contents:\n");
ALOGD(" versToExt=%u gpBits=0x%04x compression=%u\n",
mVersionToExtract, mGPBitFlag, mCompressionMethod);
ALOGD(" modTime=0x%04x modDate=0x%04x crc32=0x%08lx\n",
mLastModFileTime, mLastModFileDate, mCRC32);
ALOGD(" compressedSize=%lu uncompressedSize=%lu\n",
mCompressedSize, mUncompressedSize);
ALOGD(" filenameLen=%u extraLen=%u\n",
mFileNameLength, mExtraFieldLength);
if (mFileName != NULL)
ALOGD(" filename: '%s'\n", mFileName);
}
/*
* ===========================================================================
* ZipEntry::CentralDirEntry
* ===========================================================================
*/
/*
* Read the central dir entry that appears next in the file.
*
* On entry, "fp" should be positioned on the signature bytes for the
* entry. On exit, "fp" will point at the signature word for the next
* entry or for the EOCD.
*/
status_t ZipEntry::CentralDirEntry::read(FILE* fp)
{
status_t result = NO_ERROR;
unsigned char buf[kCDELen];
/* no re-use */
assert(mFileName == NULL);
assert(mExtraField == NULL);
assert(mFileComment == NULL);
if (fread(buf, 1, kCDELen, fp) != kCDELen) {
result = UNKNOWN_ERROR;
goto bail;
}
if (ZipEntry::getLongLE(&buf[0x00]) != kSignature) {
ALOGD("Whoops: didn't find expected signature\n");
result = UNKNOWN_ERROR;
goto bail;
}
mVersionMadeBy = ZipEntry::getShortLE(&buf[0x04]);
mVersionToExtract = ZipEntry::getShortLE(&buf[0x06]);
mGPBitFlag = ZipEntry::getShortLE(&buf[0x08]);
mCompressionMethod = ZipEntry::getShortLE(&buf[0x0a]);
mLastModFileTime = ZipEntry::getShortLE(&buf[0x0c]);
mLastModFileDate = ZipEntry::getShortLE(&buf[0x0e]);
mCRC32 = ZipEntry::getLongLE(&buf[0x10]);
mCompressedSize = ZipEntry::getLongLE(&buf[0x14]);
mUncompressedSize = ZipEntry::getLongLE(&buf[0x18]);
mFileNameLength = ZipEntry::getShortLE(&buf[0x1c]);
mExtraFieldLength = ZipEntry::getShortLE(&buf[0x1e]);
mFileCommentLength = ZipEntry::getShortLE(&buf[0x20]);
mDiskNumberStart = ZipEntry::getShortLE(&buf[0x22]);
mInternalAttrs = ZipEntry::getShortLE(&buf[0x24]);
mExternalAttrs = ZipEntry::getLongLE(&buf[0x26]);
mLocalHeaderRelOffset = ZipEntry::getLongLE(&buf[0x2a]);
// TODO: validate sizes and offsets
/* grab filename */
if (mFileNameLength != 0) {
mFileName = new unsigned char[mFileNameLength+1];
if (mFileName == NULL) {
result = NO_MEMORY;
goto bail;
}
if (fread(mFileName, 1, mFileNameLength, fp) != mFileNameLength) {
result = UNKNOWN_ERROR;
goto bail;
}
mFileName[mFileNameLength] = '\0';
}
/* read "extra field" */
if (mExtraFieldLength != 0) {
mExtraField = new unsigned char[mExtraFieldLength+1];
if (mExtraField == NULL) {
result = NO_MEMORY;
goto bail;
}
if (fread(mExtraField, 1, mExtraFieldLength, fp) != mExtraFieldLength) {
result = UNKNOWN_ERROR;
goto bail;
}
mExtraField[mExtraFieldLength] = '\0';
}
/* grab comment, if any */
if (mFileCommentLength != 0) {
mFileComment = new unsigned char[mFileCommentLength+1];
if (mFileComment == NULL) {
result = NO_MEMORY;
goto bail;
}
if (fread(mFileComment, 1, mFileCommentLength, fp) != mFileCommentLength)
{
result = UNKNOWN_ERROR;
goto bail;
}
mFileComment[mFileCommentLength] = '\0';
}
bail:
return result;
}
/*
* Write a central dir entry.
*/
status_t ZipEntry::CentralDirEntry::write(FILE* fp)
{
unsigned char buf[kCDELen];
ZipEntry::putLongLE(&buf[0x00], kSignature);
ZipEntry::putShortLE(&buf[0x04], mVersionMadeBy);
ZipEntry::putShortLE(&buf[0x06], mVersionToExtract);
ZipEntry::putShortLE(&buf[0x08], mGPBitFlag);
ZipEntry::putShortLE(&buf[0x0a], mCompressionMethod);
ZipEntry::putShortLE(&buf[0x0c], mLastModFileTime);
ZipEntry::putShortLE(&buf[0x0e], mLastModFileDate);
ZipEntry::putLongLE(&buf[0x10], mCRC32);
ZipEntry::putLongLE(&buf[0x14], mCompressedSize);
ZipEntry::putLongLE(&buf[0x18], mUncompressedSize);
ZipEntry::putShortLE(&buf[0x1c], mFileNameLength);
ZipEntry::putShortLE(&buf[0x1e], mExtraFieldLength);
ZipEntry::putShortLE(&buf[0x20], mFileCommentLength);
ZipEntry::putShortLE(&buf[0x22], mDiskNumberStart);
ZipEntry::putShortLE(&buf[0x24], mInternalAttrs);
ZipEntry::putLongLE(&buf[0x26], mExternalAttrs);
ZipEntry::putLongLE(&buf[0x2a], mLocalHeaderRelOffset);
if (fwrite(buf, 1, kCDELen, fp) != kCDELen)
return UNKNOWN_ERROR;
/* write filename */
if (mFileNameLength != 0) {
if (fwrite(mFileName, 1, mFileNameLength, fp) != mFileNameLength)
return UNKNOWN_ERROR;
}
/* write "extra field" */
if (mExtraFieldLength != 0) {
if (fwrite(mExtraField, 1, mExtraFieldLength, fp) != mExtraFieldLength)
return UNKNOWN_ERROR;
}
/* write comment */
if (mFileCommentLength != 0) {
if (fwrite(mFileComment, 1, mFileCommentLength, fp) != mFileCommentLength)
return UNKNOWN_ERROR;
}
return NO_ERROR;
}
/*
* Dump the contents of a CentralDirEntry object.
*/
void ZipEntry::CentralDirEntry::dump(void) const
{
ALOGD(" CentralDirEntry contents:\n");
ALOGD(" versMadeBy=%u versToExt=%u gpBits=0x%04x compression=%u\n",
mVersionMadeBy, mVersionToExtract, mGPBitFlag, mCompressionMethod);
ALOGD(" modTime=0x%04x modDate=0x%04x crc32=0x%08lx\n",
mLastModFileTime, mLastModFileDate, mCRC32);
ALOGD(" compressedSize=%lu uncompressedSize=%lu\n",
mCompressedSize, mUncompressedSize);
ALOGD(" filenameLen=%u extraLen=%u commentLen=%u\n",
mFileNameLength, mExtraFieldLength, mFileCommentLength);
ALOGD(" diskNumStart=%u intAttr=0x%04x extAttr=0x%08lx relOffset=%lu\n",
mDiskNumberStart, mInternalAttrs, mExternalAttrs,
mLocalHeaderRelOffset);
if (mFileName != NULL)
ALOGD(" filename: '%s'\n", mFileName);
if (mFileComment != NULL)
ALOGD(" comment: '%s'\n", mFileComment);
}
/*
* Copy-assignment operator for CentralDirEntry.
*/
ZipEntry::CentralDirEntry& ZipEntry::CentralDirEntry::operator=(const ZipEntry::CentralDirEntry& src) {
if (this == &src) {
return *this;
}
// Free up old data.
delete[] mFileName;
delete[] mExtraField;
delete[] mFileComment;
// Copy scalars.
mVersionMadeBy = src.mVersionMadeBy;
mVersionToExtract = src.mVersionToExtract;
mGPBitFlag = src.mGPBitFlag;
mCompressionMethod = src.mCompressionMethod;
mLastModFileTime = src.mLastModFileTime;
mLastModFileDate = src.mLastModFileDate;
mCRC32 = src.mCRC32;
mCompressedSize = src.mCompressedSize;
mUncompressedSize = src.mUncompressedSize;
mFileNameLength = src.mFileNameLength;
mExtraFieldLength = src.mExtraFieldLength;
mFileCommentLength = src.mFileCommentLength;
mDiskNumberStart = src.mDiskNumberStart;
mInternalAttrs = src.mInternalAttrs;
mExternalAttrs = src.mExternalAttrs;
mLocalHeaderRelOffset = src.mLocalHeaderRelOffset;
// Copy strings, if necessary.
if (mFileNameLength > 0) {
mFileName = new unsigned char[mFileNameLength + 1];
if (mFileName != NULL)
strcpy((char*)mFileName, (char*)src.mFileName);
} else {
mFileName = NULL;
}
if (mFileCommentLength > 0) {
mFileComment = new unsigned char[mFileCommentLength + 1];
if (mFileComment != NULL)
strcpy((char*)mFileComment, (char*)src.mFileComment);
} else {
mFileComment = NULL;
}
if (mExtraFieldLength > 0) {
/* we null-terminate this, though it may not be a string */
mExtraField = new unsigned char[mExtraFieldLength + 1];
if (mExtraField != NULL)
memcpy(mExtraField, src.mExtraField, mExtraFieldLength + 1);
} else {
mExtraField = NULL;
}
return *this;
}