C++ ZipEntry::initFromExternal方法代码示例

/*
 * Add an entry by copying it from another zip file.  If "padding" is
 * nonzero, the specified number of bytes will be added to the "extra"
 * field in the header.
 *
 * If "ppEntry" is non-NULL, a pointer to the new entry will be returned.
 */
status_t ZipFile::add(const ZipFile* pSourceZip, const ZipEntry* pSourceEntry,
    int padding, ZipEntry** ppEntry)
{
    ZipEntry* pEntry = NULL;
    status_t result;
    long lfhPosn, endPosn;

    if (mReadOnly)
        return INVALID_OPERATION;

    /* make sure we're in a reasonable state */
    assert(mZipFp != NULL);
    assert(mEntries.size() == mEOCD.mTotalNumEntries);

    if (fseek(mZipFp, mEOCD.mCentralDirOffset, SEEK_SET) != 0) {
        result = UNKNOWN_ERROR;
        goto bail;
    }

    pEntry = new ZipEntry;
    if (pEntry == NULL) {
        result = NO_MEMORY;
        goto bail;
    }

    result = pEntry->initFromExternal(pSourceZip, pSourceEntry);
    if (result != NO_ERROR)
        goto bail;
    if (padding != 0) {
        result = pEntry->addPadding(padding);
        if (result != NO_ERROR)
            goto bail;
    }

    /*
     * From here on out, failures are more interesting.
     */
    mNeedCDRewrite = true;

    /*
     * Write the LFH.  Since we're not recompressing the data, we already
     * have all of the fields filled out.
     */
    lfhPosn = ftell(mZipFp);
    pEntry->mLFH.write(mZipFp);

    /*
     * Copy the data over.
     *
     * If the "has data descriptor" flag is set, we want to copy the DD
     * fields as well.  This is a fixed-size area immediately following
     * the data.
     */
    if (fseek(pSourceZip->mZipFp, pSourceEntry->getFileOffset(), SEEK_SET) != 0)
    {
        result = UNKNOWN_ERROR;
        goto bail;
    }

    off_t copyLen;
    copyLen = pSourceEntry->getCompressedLen();
    if ((pSourceEntry->mLFH.mGPBitFlag & ZipEntry::kUsesDataDescr) != 0)
        copyLen += ZipEntry::kDataDescriptorLen;

    if (copyPartialFpToFp(mZipFp, pSourceZip->mZipFp, copyLen, NULL)
        != NO_ERROR)
    {
        LOGW("copy of '%s' failed\n", pEntry->mCDE.mFileName);
        result = UNKNOWN_ERROR;
        goto bail;
    }

    /*
     * Update file offsets.
     */
    endPosn = ftell(mZipFp);

    /*
     * Success!  Fill out new values.
     */
    pEntry->setLFHOffset(lfhPosn);      // sets mCDE.mLocalHeaderRelOffset
    mEOCD.mNumEntries++;
    mEOCD.mTotalNumEntries++;
    mEOCD.mCentralDirSize = 0;      // mark invalid; set by flush()
    mEOCD.mCentralDirOffset = endPosn;

    /*
     * Add pEntry to the list.
     */
    mEntries.add(pEntry);
    if (ppEntry != NULL)
        *ppEntry = pEntry;
    pEntry = NULL;
//.........这里部分代码省略.........

/*
 * Add an entry by copying it from another zip file, recompressing with
 * Zopfli if already compressed.
 *
 * If "ppEntry" is non-NULL, a pointer to the new entry will be returned.
 */
status_t ZipFile::addRecompress(const ZipFile* pSourceZip, const ZipEntry* pSourceEntry,
    ZipEntry** ppEntry)
{
    ZipEntry* pEntry = NULL;
    status_t result;
    long lfhPosn, startPosn, endPosn, uncompressedLen;

    if (mReadOnly)
        return INVALID_OPERATION;

    /* make sure we're in a reasonable state */
    assert(mZipFp != NULL);
    assert(mEntries.size() == mEOCD.mTotalNumEntries);

    if (fseek(mZipFp, mEOCD.mCentralDirOffset, SEEK_SET) != 0) {
        result = UNKNOWN_ERROR;
        goto bail;
    }

    pEntry = new ZipEntry;
    if (pEntry == NULL) {
        result = NO_MEMORY;
        goto bail;
    }

    result = pEntry->initFromExternal(pSourceEntry);
    if (result != NO_ERROR)
        goto bail;

    /*
     * From here on out, failures are more interesting.
     */
    mNeedCDRewrite = true;

    /*
     * Write the LFH, even though it's still mostly blank.  We need it
     * as a place-holder.  In theory the LFH isn't necessary, but in
     * practice some utilities demand it.
     */
    lfhPosn = ftell(mZipFp);
    pEntry->mLFH.write(mZipFp);
    startPosn = ftell(mZipFp);

    /*
     * Copy the data over.
     *
     * If the "has data descriptor" flag is set, we want to copy the DD
     * fields as well.  This is a fixed-size area immediately following
     * the data.
     */
    if (fseek(pSourceZip->mZipFp, pSourceEntry->getFileOffset(), SEEK_SET) != 0)
    {
        result = UNKNOWN_ERROR;
        goto bail;
    }

    uncompressedLen = pSourceEntry->getUncompressedLen();

    if (pSourceEntry->isCompressed()) {
        void *buf = pSourceZip->uncompress(pSourceEntry);
        if (buf == NULL) {
            result = NO_MEMORY;
            goto bail;
        }
        long startPosn = ftell(mZipFp);
        uint32_t crc;
        if (compressFpToFp(mZipFp, NULL, buf, uncompressedLen, &crc) != NO_ERROR) {
            ALOGW("recompress of '%s' failed\n", pEntry->mCDE.mFileName);
            result = UNKNOWN_ERROR;
            free(buf);
            goto bail;
        }
        long endPosn = ftell(mZipFp);
        pEntry->setDataInfo(uncompressedLen, endPosn - startPosn,
            pSourceEntry->getCRC32(), ZipEntry::kCompressDeflated);
        free(buf);
    } else {
        off_t copyLen;
        copyLen = pSourceEntry->getCompressedLen();
        if ((pSourceEntry->mLFH.mGPBitFlag & ZipEntry::kUsesDataDescr) != 0)
            copyLen += ZipEntry::kDataDescriptorLen;

        if (copyPartialFpToFp(mZipFp, pSourceZip->mZipFp, copyLen, NULL)
            != NO_ERROR)
        {
            ALOGW("copy of '%s' failed\n", pEntry->mCDE.mFileName);
            result = UNKNOWN_ERROR;
            goto bail;
        }
    }

    /*
     * Update file offsets.
     */
//.........这里部分代码省略.........