local int unz64local_CheckCurrentFileCoherencyHeader()

in ios/CodePush/SSZipArchive/minizip/unzip.c [962:1041]

• 68 lines of code
• 35 McCabe index (conditional complexity)

local int unz64local_CheckCurrentFileCoherencyHeader(unz64_s *s, uInt *piSizeVar, ZPOS64_T *poffset_local_extrafield,
                                                     uInt *psize_local_extrafield)
{
    uLong uMagic, uL, uFlags;
    uLong size_filename;
    uLong size_extra_field;
    int err = UNZ_OK;
    int compression_method = 0;

    *piSizeVar = 0;
    *poffset_local_extrafield = 0;
    *psize_local_extrafield = 0;

    err = unzGoToNextDisk((unzFile)s);
    if (err != UNZ_OK)
        return err;

    if (ZSEEK64(s->z_filefunc, s->filestream, s->cur_file_info_internal.offset_curfile +
                s->cur_file_info_internal.byte_before_the_zipfile, ZLIB_FILEFUNC_SEEK_SET) != 0)
        return UNZ_ERRNO;

    if (err == UNZ_OK) {
        if (unz64local_getLong(&s->z_filefunc, s->filestream, &uMagic) != UNZ_OK)
            err = UNZ_ERRNO;
        else if (uMagic != LOCALHEADERMAGIC)
            err = UNZ_BADZIPFILE;
    }

    if (unz64local_getShort(&s->z_filefunc, s->filestream, &uL) != UNZ_OK)
        err = UNZ_ERRNO;
    if (unz64local_getShort(&s->z_filefunc, s->filestream, &uFlags) != UNZ_OK)
        err = UNZ_ERRNO;
    if (unz64local_getShort(&s->z_filefunc, s->filestream, &uL) != UNZ_OK)
        err = UNZ_ERRNO;
    else if ((err == UNZ_OK) && (uL != s->cur_file_info.compression_method))
        err = UNZ_BADZIPFILE;

    compression_method = (int)s->cur_file_info.compression_method;
#ifdef HAVE_AES
    if (compression_method == AES_METHOD)
        compression_method = (int)s->cur_file_info_internal.aes_compression_method;
#endif

    if ((err == UNZ_OK) && (compression_method != 0) &&
#ifdef HAVE_BZIP2
        (compression_method != Z_BZIP2ED) &&
#endif
        (compression_method != Z_DEFLATED))
        err = UNZ_BADZIPFILE;

    if (unz64local_getLong(&s->z_filefunc, s->filestream, &uL) != UNZ_OK) /* date/time */
        err = UNZ_ERRNO;
    if (unz64local_getLong(&s->z_filefunc, s->filestream, &uL) != UNZ_OK) /* crc */
        err = UNZ_ERRNO;
    else if ((err == UNZ_OK) && (uL != s->cur_file_info.crc) && ((uFlags & 8) == 0))
        err = UNZ_BADZIPFILE;
    if (unz64local_getLong(&s->z_filefunc, s->filestream, &uL) != UNZ_OK) /* size compr */
        err = UNZ_ERRNO;
    else if ((uL != 0xffffffff) && (err == UNZ_OK) && (uL != s->cur_file_info.compressed_size) && ((uFlags & 8) == 0))
        err = UNZ_BADZIPFILE;
    if (unz64local_getLong(&s->z_filefunc, s->filestream, &uL) != UNZ_OK) /* size uncompr */
        err = UNZ_ERRNO;
    else if ((uL != 0xffffffff) && (err == UNZ_OK) && (uL != s->cur_file_info.uncompressed_size) && ((uFlags & 8) == 0))
        err = UNZ_BADZIPFILE;
    if (unz64local_getShort(&s->z_filefunc, s->filestream, &size_filename) != UNZ_OK)
        err = UNZ_ERRNO;
    else if ((err == UNZ_OK) && (size_filename != s->cur_file_info.size_filename))
        err = UNZ_BADZIPFILE;

    *piSizeVar += (uInt)size_filename;

    if (unz64local_getShort(&s->z_filefunc, s->filestream, &size_extra_field) != UNZ_OK)
        err = UNZ_ERRNO;
    *poffset_local_extrafield = s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER + size_filename;
    *psize_local_extrafield = (uInt)size_extra_field;

    *piSizeVar += (uInt)size_extra_field;

    return err;
}