C++ String8::length方法代码示例

 StriWrapLineStart(const String8& s, R_len_t v) :
    str(s.c_str()) {
    nbytes  = s.length()+v;
    count   = s.countCodePoints()+v;
    width   = stri__width_string(s.c_str(), s.length());
    str.append(std::string(v, ' '));
 }

/*
 * Determine whether or not we want to try to compress this file based
 * on the file extension.
 */
bool okayToCompress(Bundle* bundle, const String8& pathName)
{
    String8 ext = pathName.getPathExtension();
    int i;

    if (ext.length() == 0)
        return true;

    for (i = 0; i < NELEM(kNoCompressExt); i++) {
        if (strcasecmp(ext.string(), kNoCompressExt[i]) == 0)
            return false;
    }

    const android::Vector<const char*>& others(bundle->getNoCompressExtensions());
    for (i = 0; i < (int)others.size(); i++) {
        const char* str = others[i];
        int pos = pathName.length() - strlen(str);
        if (pos < 0) {
            continue;
        }
        const char* path = pathName.string();
        if (strcasecmp(path + pos, str) == 0) {
            return false;
        }
    }

    return true;
}

void
BaseCamAdapter::
showParameters(String8 const& param) const
{
    static char bufParam[4096];

    const int count = 768;
    char *pbuf = bufParam;
    char ch;
    uint32_t len;
    uint32_t i, loop;

    pbuf[0] = 0;
    len = param.length();
    if ( len > 4096) {
        len = 4096;
    }

    ::strcpy(pbuf, param.string());
    loop = (len + count - 1) / count;

    CAM_LOGD("[showParameters]: %d, %d \n", loop, len);
    for (i = 0; i < loop; i++) {
        ch = pbuf[count];
        pbuf[count] = 0;
        CAM_LOGD("(%s) \n", pbuf);
        pbuf[count] = ch;
        pbuf += count;
    }
}

void
IParamsManager::
showParameters(String8 const& rs8Param)
{
    String8 s8Log;
    ssize_t const max_cpy_len = 767;

    size_t loop = 0;
    size_t const len = rs8Param.length();
    char const* pHead = rs8Param.string();
    char const*const pEnd = pHead + len;

    for (; pHead < pEnd;)
    {
        ssize_t cpy_len = pEnd - pHead;
        if  ( cpy_len > max_cpy_len )
        {
            cpy_len = max_cpy_len;
        }
        s8Log.setTo(pHead, cpy_len);
        CAM_LOGD("%s", s8Log.string());
        pHead += cpy_len;
        loop++;
    }
    MY_LOGD("%zu %zu", loop, len);
}

const char *CameraParameters::get(const char *key) const
{
    String8 v = mMap.valueFor(String8(key));
    if (v.length() == 0)
        return 0;
    return v.string();
}

void HDMIAudioCaps::getChannelMasksForAF(String8& masks) {
    Mutex::Autolock _l(mLock);
    masks.clear();

    // If the sink does not support basic audio, then it supports no audio.
    if (!mBasicAudioSupported)
        return;

    masks.append("AUDIO_CHANNEL_OUT_STEREO");

    // To keep things simple, only report mode information for the mode
    // which supports the maximum number of channels.
    ssize_t ndx = getMaxChModeNdx_l();
    if (ndx < 0)
        return;

    if (mModes[ndx].max_ch >= 6) {
        if (masks.length())
            masks.append("|");

        masks.append((mModes[ndx].max_ch >= 8)
                ? "AUDIO_CHANNEL_OUT_5POINT1|AUDIO_CHANNEL_OUT_7POINT1"
                : "AUDIO_CHANNEL_OUT_5POINT1");
    }
}

AudioParameter::AudioParameter(const String8& keyValuePairs)
{
    char *str = new char[keyValuePairs.length()+1];
    mKeyValuePairs = keyValuePairs;
    char *last;

    strcpy(str, keyValuePairs.string());
    char *pair = strtok_r(str, ";", &last);
    while (pair != NULL) {
        if (strlen(pair) != 0) {
            size_t eqIdx = strcspn(pair, "=");
            String8 key = String8(pair, eqIdx);
            String8 value;
            if (eqIdx == strlen(pair)) {
                value = String8("");
            } else {
                value = String8(pair + eqIdx + 1);
            }
            if (mParameters.indexOfKey(key) < 0) {
                mParameters.add(key, value);
            } else {
                mParameters.replaceValueFor(key, value);
            }
        } else {
            ALOGV("AudioParameter() cstor empty key value pair");
        }
        pair = strtok_r(NULL, ";", &last);
    }

    delete[] str;
}

    void printRefs() const
    {
        String8 text;

        {
            Mutex::Autolock _l(mMutex);
            char buf[128];
            sprintf(buf, "Strong references on RefBase %p (weakref_type %p):\n", mBase, this);
            text.append(buf);
            printRefsLocked(&text, mStrongRefs);
            sprintf(buf, "Weak references on RefBase %p (weakref_type %p):\n", mBase, this);
            text.append(buf);
            printRefsLocked(&text, mWeakRefs);
        }

        {
            char name[100];
            snprintf(name, 100, DEBUG_REFS_CALLSTACK_PATH "/%p.stack", this);
            int rc = open(name, O_RDWR | O_CREAT | O_APPEND, 644);
            if (rc >= 0) {
                write(rc, text.string(), text.length());
                close(rc);
                ALOGD("STACK TRACE for %p saved in %s", this, name);
            }
            else ALOGE("FAILED TO PRINT STACK TRACE for %p in %s: %s", this,
                      name, strerror(errno));
        }
    }

status_t
BackupDataWriter::WriteEntityHeader(const String8& key, size_t dataSize)
{
    if (m_status != NO_ERROR) {
        return m_status;
    }

    ssize_t amt;

    amt = write_padding_for(m_pos);
    if (amt != 0) {
        return amt;
    }

    String8 k;
    if (m_keyPrefix.length() > 0) {
        k = m_keyPrefix;
        k += ":";
        k += key;
    } else {
        k = key;
    }
    if (DEBUG) {
        ALOGD("Writing header: prefix='%s' key='%s' dataSize=%d", m_keyPrefix.string(),
                key.string(), dataSize);
    }

    entity_header_v1 header;
    ssize_t keyLen;

    keyLen = k.length();

    header.type = tolel(BACKUP_HEADER_ENTITY_V1);
    header.keyLen = tolel(keyLen);
    header.dataSize = tolel(dataSize);

    if (DEBUG) ALOGI("writing entity header, %d bytes", sizeof(entity_header_v1));
    amt = write(m_fd, &header, sizeof(entity_header_v1));
    if (amt != sizeof(entity_header_v1)) {
        m_status = errno;
        return m_status;
    }
    m_pos += amt;

    if (DEBUG) ALOGI("writing entity header key, %ld bytes", keyLen+1);
    amt = write(m_fd, k.string(), keyLen+1);
    if (amt != keyLen+1) {
        m_status = errno;
        return m_status;
    }
    m_pos += amt;

    amt = write_padding_for(keyLen+1);

    m_entityCount++;

    return amt;
}

int FwdLockEngine::onGetDrmObjectType(int uniqueId,
                                      const String8& path,
                                      const String8& mimeType) {
    String8 mimeStr = String8(mimeType);

    LOG_VERBOSE("FwdLockEngine::onGetDrmObjectType");

    /* Checks whether
    * 1. path and mime type both are not empty strings (meaning unavailable) else content is unknown
    * 2. if one of them is empty string and if other is known then its a DRM Content Object.
    * 3. if both of them are available, then both may be of known type
    *    (regardless of the relation between them to make it compatible with other DRM Engines)
    */
    if (((0 == path.length()) || onCanHandle(uniqueId, path)) &&
        ((0 == mimeType.length()) || IsMimeTypeSupported(mimeType)) && (mimeType != path) ) {
            return DrmObjectType::CONTENT;
    }

    return DrmObjectType::UNKNOWN;
}

static void appendInputDeviceConfigurationFileRelativePath(String8& path,
        const String8& name, InputDeviceConfigurationFileType type) {
    path.append(CONFIGURATION_FILE_DIR[type]);
    for (size_t i = 0; i < name.length(); i++) {
        char ch = name[i];
        if (!isValidNameChar(ch)) {
            ch = '_';
        }
        path.append(&ch, 1);
    }
    path.append(CONFIGURATION_FILE_EXTENSION[type]);
}

Element *Element::createFromStream(Context *rsc, IStream *stream) {
    // First make sure we are reading the correct object
    RsA3DClassID classID = (RsA3DClassID)stream->loadU32();
    if (classID != RS_A3D_CLASS_ID_ELEMENT) {
        LOGE("element loading skipped due to invalid class id\n");
        return NULL;
    }

    String8 name;
    stream->loadString(&name);

    Component component;
    component.loadFromStream(stream);

    uint32_t fieldCount = stream->loadU32();
    if (!fieldCount) {
        return (Element *)Element::create(rsc,
                                          component.getType(),
                                          component.getKind(),
                                          component.getIsNormalized(),
                                          component.getVectorSize());;
    }

    const Element **subElems = new const Element *[fieldCount];
    const char **subElemNames = new const char *[fieldCount];
    size_t *subElemNamesLengths = new size_t[fieldCount];
    uint32_t *arraySizes = new uint32_t[fieldCount];

    String8 elemName;
    for (uint32_t ct = 0; ct < fieldCount; ct ++) {
        stream->loadString(&elemName);
        subElemNamesLengths[ct] = elemName.length();
        char *tmpName = new char[subElemNamesLengths[ct]];
        memcpy(tmpName, elemName.string(), subElemNamesLengths[ct]);
        subElemNames[ct] = tmpName;
        arraySizes[ct] = stream->loadU32();
        subElems[ct] = Element::createFromStream(rsc, stream);
    }

    const Element *elem = Element::create(rsc, fieldCount, subElems, subElemNames,
                                          subElemNamesLengths, arraySizes);
    for (uint32_t ct = 0; ct < fieldCount; ct ++) {
        delete [] subElemNames[ct];
        subElems[ct]->decUserRef();
    }
    delete[] subElems;
    delete[] subElemNames;
    delete[] subElemNamesLengths;
    delete[] arraySizes;

    return (Element *)elem;
}

void EventLog::TagBuffer::writeString8(const String8& value) {
    if (mOverflow) return;
    const int32_t stringLen = value.length();
    const size_t needed = 1 + sizeof(int32_t) + stringLen;
    if (mPos + needed > STORAGE_MAX_SIZE) {
        mOverflow = true;
        return;
    }
    mStorage[mPos + 0] = EVENT_TYPE_STRING;
    memcpy(&mStorage[mPos + 1], &stringLen, sizeof(int32_t));
    memcpy(&mStorage[mPos + 5], value.string(), stringLen);
    mPos += needed;
}

bool DrmManager::canHandle(int uniqueId, const String8& path, const String8& mimeType) {
    const String8 plugInId = getSupportedPlugInId(mimeType);
    bool result = (EMPTY_STRING != plugInId) ? true : false;

    if (0 < path.length()) {
        if (result) {
            IDrmEngine& rDrmEngine = mPlugInManager.getPlugIn(plugInId);
            result = rDrmEngine.canHandle(uniqueId, path);
        } else {
            result = canHandle(uniqueId, path);
        }
    }
    return result;
}

/******************************************************************************
 * Function: usbCamGetParameters
 * Description: This function allocates memory for parameter string,
 *              composes and returns the parameter string
 *
 * Input parameters:
 *   camHal             - camera HAL handle
 *
 * Return values:
 *      Address to the parameter string
 *
 * Notes: none
 *****************************************************************************/
char* usbCamGetParameters(camera_hardware_t *camHal)
{
    ALOGD("%s: E", __func__);
    char *parms = NULL;
    char* rc = NULL;
    String8 str;

    QCameraParameters qParam = camHal->qCamParams;
    //qParam.dump();
    str = qParam.flatten( );
    rc = (char *)malloc(sizeof(char)*(str.length()+1));
    if(rc != NULL){
        memset(rc, 0, sizeof(char)*(str.length()+1));
        strncpy(rc, str.string(), str.length());
    rc[str.length()] = 0;
    parms = rc;
    }

    PRINT_PARAM_STR(parms);

    ALOGD("%s: X", __func__);
    return (parms);
} /* usbCamGetParameters */