Support vendor MPEG4 test content with apparently malformed chunks in them.

    printf("%sfound chunk '%s' of size %lld\n", indent, chunk, chunk_size);

    char buffer[256];

    if (chunk_size <= sizeof(buffer)) {

        if (mDataSource->readAt(*offset, buffer, chunk_size)

                < (ssize_t)chunk_size) {

    size_t n = chunk_size;

    if (n > sizeof(buffer)) {

        n = sizeof(buffer);

    }

    if (mDataSource->readAt(*offset, buffer, n)

            < (ssize_t)n) {

        return ERROR_IO;

    }

        hexdump(buffer, chunk_size);

    }

    hexdump(buffer, n);

#endif

    PathAdder autoAdder(&mPath, chunk_type);

            if (U32_AT(buffer) != 0) {

                // Should be version 0, flags 0.

                return ERROR_MALFORMED;

                // If it's not, let's assume this is one of those

                // apparently malformed chunks that don't have flags

                // and completely different semantics than what's

                // in the MPEG4 specs and skip it.

                *offset += chunk_size;

                return OK;

            }

            off_t stop_offset = *offset + chunk_size;

    if (!memcmp(header, "ftyp3gp", 7) || !memcmp(header, "ftypmp42", 8)

        || !memcmp(header, "ftypisom", 8) || !memcmp(header, "ftypM4V ", 8)

        || !memcmp(header, "ftypM4A ", 8) || !memcmp(header, "ftypf4v ", 8)) {

        || !memcmp(header, "ftypM4A ", 8) || !memcmp(header, "ftypf4v ", 8)

        || !memcmp(header, "ftypkddi", 8)) {

        *mimeType = MEDIA_MIMETYPE_CONTAINER_MPEG4;

        *confidence = 0.1;