Merge \"CameraMetadata JNI: Move tag lookup to common utility code\" into nyc-mr1-dev

        // exception thrown by ScopedUtfChars

        return 0;

    }

    size_t keyLength = strlen(key);

    ALOGV("%s (key = '%s')", __FUNCTION__, key);

    sp<VendorTagDescriptor> vTags = VendorTagDescriptor::getGlobalVendorTagDescriptor();

    SortedVector<String8> vendorSections;

    size_t vendorSectionCount = 0;

    if (vTags != NULL) {

        vendorSections = vTags->getAllSectionNames();

        vendorSectionCount = vendorSections.size();

    }

    // First, find the section by the longest string match

    const char *section = NULL;

    size_t sectionIndex = 0;

    size_t sectionLength = 0;

    size_t totalSectionCount = ANDROID_SECTION_COUNT + vendorSectionCount;

    for (size_t i = 0; i < totalSectionCount; ++i) {

        const char *str = (i < ANDROID_SECTION_COUNT) ? camera_metadata_section_names[i] :

                vendorSections[i - ANDROID_SECTION_COUNT].string();

        if (kIsDebug) {

            ALOGV("%s: Trying to match against section '%s'", __FUNCTION__, str);

        }

        if (strstr(key, str) == key) { // key begins with the section name

            size_t strLength = strlen(str);

            if (kIsDebug) {

                ALOGV("%s: Key begins with section name", __FUNCTION__);

            }

            // section name is the longest we've found so far

            if (section == NULL || sectionLength < strLength) {

                section = str;

                sectionIndex = i;

                sectionLength = strLength;

                if (kIsDebug) {

                    ALOGV("%s: Found new best section (%s)", __FUNCTION__, section);

                }

            }

        }

    }

    // TODO: Make above get_camera_metadata_section_from_name ?

    if (section == NULL) {

        jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException",

                             "Could not find section name for key '%s')", key);

        return 0;

    } else {

        ALOGV("%s: Found matched section '%s' (%zu)",

              __FUNCTION__, section, sectionIndex);

    }

    // Get the tag name component of the key

    const char *keyTagName = key + sectionLength + 1; // x.y.z -> z

    if (sectionLength + 1 >= keyLength) {

        jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException",

                             "Key length too short for key '%s')", key);

        return 0;

    }

    // Match rest of name against the tag names in that section only

    uint32_t tag = 0;

    if (sectionIndex < ANDROID_SECTION_COUNT) {

        // Match built-in tags (typically android.*)

        uint32_t tagBegin, tagEnd; // [tagBegin, tagEnd)

        tagBegin = camera_metadata_section_bounds[sectionIndex][0];

        tagEnd = camera_metadata_section_bounds[sectionIndex][1];

        for (tag = tagBegin; tag < tagEnd; ++tag) {

            const char *tagName = get_camera_metadata_tag_name(tag);

            if (strcmp(keyTagName, tagName) == 0) {

                ALOGV("%s: Found matched tag '%s' (%d)",

                      __FUNCTION__, tagName, tag);

                break;

            }

        }

        if (tag == tagEnd) {

    sp<VendorTagDescriptor> vTags =

            VendorTagDescriptor::getGlobalVendorTagDescriptor();

    status_t res = CameraMetadata::getTagFromName(key, vTags.get(), &tag);

    if (res != OK) {

        jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException",

                                 "Could not find tag name for key '%s')", key);

            return 0;

                             "Could not find tag for key '%s')", key);

    }

    } else if (vTags != NULL) {

        // Match vendor tags (typically com.*)

        const String8 sectionName(section);

        const String8 tagName(keyTagName);

        status_t res = OK;

        if ((res = vTags->lookupTag(tagName, sectionName, &tag)) != OK) {

            jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException",

                    "%s: No vendor tag matches key '%s'", __FUNCTION__, key);

            return 0;

        }

    }

    // TODO: Make above get_camera_metadata_tag_from_name ?

    return tag;

}