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AK: Compute the exact size of decoded Base64 strings

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Timothy Flynn 2024-03-24 08:55:53 -04:00 committed by Andreas Kling
parent 754ff41b9c
commit 4ecf4c7617
1 changed files with 8 additions and 4 deletions
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12
AK/Base64.cpp
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@ -15,7 +15,14 @@ namespace AK {
size_t calculate_base64_decoded_length(StringView input) size_t calculate_base64_decoded_length(StringView input)
{ {
return input.length() * 3 / 4; auto length = input.length() * 3 / 4;
if (input.ends_with("="sv))
--length;
if (input.ends_with("=="sv))
--length;
return length;
} }
size_t calculate_base64_encoded_length(ReadonlyBytes input) size_t calculate_base64_encoded_length(ReadonlyBytes input)
@ -70,9 +77,6 @@ static ErrorOr<ByteBuffer> decode_base64_impl(StringView input, ReadonlySpan<i16
output[output_offset++] = ((in2 & 0x3) << 6) | in3; output[output_offset++] = ((in2 & 0x3) << 6) | in3;
} }
if (output_offset < output.size())
output.trim(output_offset, false);
return output; return output;
} }