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Implementing a Base64 encoder and decoder from scratch in Rust. SUBSTR ('abc', 1, 1) returns ‘a’, not ‘b’. Hex dump: 10. get image from base64 string in This gives … index out of range There are many strings that may be "valid base64" according to the syntax suggested by several posters, but that may "correctly" decode, without exception, to junk. The number of bytes if the input is BINARY. How to base64 encode and decode from command-line I’ve tried this and added additional logging in decode method (output encoded string at the beginning and output hex value when throwing the exception). To some strings this works, … string sub: Return the result from subtracting the second number from the first number. (val & 0x3F): 64)]; val >>= 6; out[index+1] = alphabet[val & 0x3F]; val >>= 6; out[index+0] = alphabet[val & 0x3F]; } return out; } /** * Decodes a BASE-64 encoded stream to recover the original * data. How can I decode a base64 string from the command line? @Jens String.fromCharCode.apply() methods cannot reproduce UTF-8: UTF-8 characters may vary in length from one byte to four bytes, yet String.fromCharCode.apply() examines a UInt8Array in segments of UInt8, so it erroneously assumes each character to be exactly one byte long and independent of the neighbouring ones.