#Base64 encoding size increase zip file
#Base64 encoding size increase code

⚠️ IntroductionĮver since Steve Souders started evangelizing web performance, it’s been pounded into our heads that extra HTTP requests add a lot of additional overhead, and that we should combine them if possible to dramatically decrease the load time of our web pages. Replace test.⚠️ Warning: this is an old article and may include information that’s out of date. It can be confirmed that there is no difference because there is no output PIEAAAAAdGVzdC50eHRVVAUAA7qooV51eAsAAQToAwAABOgDAABQSwUGAAAAAAEAAQBOAAAASgAA $ UEsDBBQAAAAIAPu8l1C + TvKVCAAAAA0AAAAIABwAdGVzdC50eHRVVAkAA7qooV66qKFedXgLAAEE $Ħ AMAAAToAwAAe9zY9BiGuABQSwECHgMUAAAACAD7vJdQvk7ylQgAAAANAAAACAAYAAAAAAABAAAA$ PIEAAAAAdGVzdC50eHRVVAUAA7qooV51eAsAAQToAwAABOgDAABQSwUGAAAAAAEAAQBOAAAASgAA UEsDBBQAAAAIAPu8l1C + TvKVCAAAAA0AAAAIABwAdGVzdC50eHRVVAkAA7qooV66qKFedXgLAAEEĦAMAAAToAwAAe9zY9BiGuABQSwECHgMUAAAACAD7vJdQvk7ylQgAAAANAAAACAAYAAAAAAABAAAA

#Base64 encoding size increase code

You can see that there is a line feed code $cat test.bat With Zend OPcache v7.3.11-1 ~ deb10u1, Copyright (c) 1999-2018, by Zend TechnologiesĮncoded to base64d $base64 test.zip>test.bat` Zend Engine v3.3.11, Copyright (c) 1998-2018 Zend Technologies PHP version (not verified, but I think it will work with PHP 5.5) $php -v May need to be modified to match the actual binary In the environment of the answer, everything from compression to linux, so the number of bytes is determined by PHP_EOL. Here, the encoding environment is linux, so the line feed code is LF (1 byte), but depending on the encoding environment it should be CRLF (2 bytes), so change it according to the specifications of the file you want to handle It is OK to multiply the total value by n. Determine the number of bytes to read at one time according to MIME. File name is decided for the time being The number of bytes that is read once is set to a multiple of (76 bytes + line feed code), and the line feed code is included in base64_decode (). If bufferSize is larger than the file, you can also decode the line feed code (base64_decode () works well) The specification referring to this document explicitly directs baseĮncoders to add line feeds after a specific number of characters.Īs a result, the line feed code is included in 4 bytes when reading in multiples of 4 bytes, and one set of Base64 is destroyed. Implementations MUST NOT add line feeds to base-encoded data unless That it is 'virtually identical' however, PEM uses a line length ofĦ4 characters.The MIME and PEM limits are both due to limits within Inherits the encoding from Privacy Enhanced Mail (PEM) , Limit on line length of base 64-encoded data to 76 characters.MIME MIME does not define 'base 64' per se, but rather a 'base 64 Content. MIME is often used as a reference for base 64 encoding. RFC The Base16, Base32, and Base64 Data Encodings When base64-encoded, a line feed code is inserted every 76 bytes (Base64 specifications (not required, but it seems that there are many implementations by default to match the MIME specifications?)) Since I was interested, I tried it with Raspbian at hand, and it is not smart, but I solved it so I will answer.

#Base64 encoding size increase zip file

If i change the value of bufferSize, the size of the downloaded zip file will be slightly different.Header ('Content-Disposition: attachment filename = ''. Header ('Content-Type: application/zip') (I get angry when the CRC does not match when answering the zip.)Īpplicable code Save base64 text obtained from API in # $localFile.

I want to decode the encoded base64 file obtained from the API and convert it to a zip file.

The specified API returns a base64-encoded value (the specification is fixed by this).

This was supposed to work, but I can't decode it. The specific bytes are read and decoded by fread. We also anticipate cases where the file size will increase, I want to decode a base64 encoded file in php.