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b8c019ef49
This makes a few changes to the base64 codecs. * The padding character is optional. The common "URL-safe" variant, in particular, is generally not used with padding. This is also the case for password hashes, so having this will avoid code duplication with bcrypt, scrypt and other functions. * The URL-safe variant is added. Instead of having individual constants for each parameter of each variant, we are now grouping these in a struct. So, `standard_pad_char` just becomes `standard.pad_char`. * Types are not `snake_case`'d any more. So, `standard_encoder` becomes `standard.Encoder`, as it is a type. * Creating a decoder with ignored characters required the alphabet and padding. Now, `standard.decoderWithIgnore(<ignored chars>)` returns a decoder with the standard parameters and the set of ignored chars. * Whatever applies to `standard.*` obviously also works with `url_safe.*` * the `calcSize()` interface was inconsistent, taking a length in the encoder, and a slice in the encoder. Rename the variant that takes a slice to `calcSizeForSlice()`. * In the decoder with ignored characters, add `calcSizeUpperBound()`, which is more useful than the one that takes a slice in order to size a fixed buffer before we have the data. * Return `error.InvalidCharacter` when the input actually contains characters that are neither padding nor part of the alphabet. If we hit a padding issue (which includes extra bits at the end), consistently return `error.InvalidPadding`. * Don't keep the `char_in_alphabet` array permanently in a decoder; it is only required for sanity checks during initialization. * Tests are unchanged, but now cover both the standard (padded) and the url-safe (non-padded) variants. * Add an error set, rename `OutputTooSmallError` to `NoSpaceLeft` to match the `hex2bin` equivalent.
14 lines
499 B
Zig
14 lines
499 B
Zig
const base64 = @import("std").base64;
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export fn decode_base_64(dest_ptr: [*]u8, dest_len: usize, source_ptr: [*]const u8, source_len: usize) usize {
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const src = source_ptr[0..source_len];
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const dest = dest_ptr[0..dest_len];
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const base64_decoder = base64.standard.DecoderUnsafe;
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const decoded_size = base64_decoder.calcSizeForSlice(src) catch unreachable;
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base64_decoder.decode(dest[0..decoded_size], src);
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return decoded_size;
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}
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var x: c_int = 1234;
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export var x_ptr = &x;
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