NUL is \0. Even if padding with null characters may be allowed by some librairies, such padding is not allowed in the specification and the resulting JSON documents won't be portable. As char will very often be used to store a character code, C designers thought of a simpler way than store a number in a char. The string you sent is the full bytes sent to the network, including the function selector. The terminating null is there to terminate the string. Learn more about bidirectional Unicode characters. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. function createNetwork(bytes32 name) with an Ascii string: Error is thrown: It is possible that some tools can pad zero bytes around a value if it is smaller than the required length, for easy use. @Oipo The following should work just fine, as remarked by @TkTech . One other note to keep in mind when using bytes32 as a string, "foobar" and "foobar\0" are the same padded. Check if a variable is a string in JavaScript, How to make chocolate safe for Keidran? Maybe I'm going at this all the wrong way. How were Acorn Archimedes used outside education? From my part we can close this as I've gone up to v1 of web3.utils which has a utf8ToHex, asciiToHex and a handful of other useful conversion functions http://web3js.readthedocs.io/en/1.0/web3-utils.html?highlight=toUTF#utf8tohex, Also, the auto conversion between strings (used as keys) and their encoded bytes32 hex equivalent has been discussed here well before the v1 release above web3/web3.js#271 including comments from "the author of Solidity" :). Are you able to decode these? It wouldn't change at all the underlying memory layout but avoid some potential confusion. (Basically Dog-people), How to pass duration to lilypond function, Poisson regression with constraint on the coefficients of two variables be the same, Get possible sizes of product on product page in Magento 2, Attaching Ethernet interface to an SoC which has no embedded Ethernet circuit. Also the value present in the bytes32 is not equal to 0. How Intuit improves security, latency, and development velocity with a Site Maintenance - Friday, January 20, 2023 02:00 - 05:00 UTC (Thursday, Jan Ethers and Web3-React: Cannot estimate gas when trying to connect with contracts deployed on testnet and using Alchemy as node provider, solidity cannot verify ethers.js signed data, How to get the array length in ethers.js and hardhat. Strings shorter than 32 bytes should just translate to left-justified ascii e.g. You could possibly do what pascal did and put the length of the string in the first character, but this is a bit of a pain and will limit your string length to the size of the integer that can fit in the space of the first char. or if your current C charset is ASCII, which is usually true (not much EBCDIC around today), There is also a largely ignored way that works only in C (not C++). If I really will write my own abi coder then I will definitely use your test cases! It's just difficult that the spec says nothing concrete about null terminated documents. Otherwise, you could use another delimeter, so long as it isn't used within the string itself. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If the '\0' is at the end of the strings, why don't you trim it off before sending the content to the parser? Trying to match up a new seat for my bicycle and having difficulty finding one that will work. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. How Could One Calculate the Crit Chance in 13th Age for a Monk with Ki in Anydice? If for some reason you absolutely do not want a null character at the end of your string in memory, you'd have to manually create a block of characters, and fill it out yourself. Anyhoo, hope that helps explain things, and feel free to bug me if you have any questions. If something is not included in a grammar, then it is not allowed. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to check whether a string contains a substring in JavaScript? As I think that I have convincingly argue, that '\0' should not be considered to be part of the JSON document. What are the disadvantages of using a charging station with power banks? He believes the initial 4 bytes of the string are a selector hash of something, but I haven't been able to figure out of what yet. . Making statements based on opinion; back them up with references or personal experience. function execute(bytes32 txHash,uint8[] memory sigV, bytes32[] memory sigR, bytes32[] memory sigS)returns(address[] memory){ address[] public recoveredAddr; for(uint i=0; i