AK+LibWeb: Move decode forgiving base64 under Web::Infra namespace

Since the forgiving base64 is part of the web infra standard

2 files changed, 0 insertions, 100 deletions

diff --git a/AK/Base64.cpp b/AK/Base64.cpp
index aa887b9eab..7b48de7eb2 100644
--- a/AK/Base64.cpp
+++ b/AK/Base64.cpp
@@ -121,102 +121,4 @@ ErrorOr<String> encode_base64(ReadonlyBytes input)
     return output.to_string();
 }
 
-// https://infra.spec.whatwg.org/#forgiving-base64
-ErrorOr<ByteBuffer> decode_forgiving_base64(StringView input)
-{
-    // 1. Remove all ASCII whitespace from data.
-    auto data = input.trim_whitespace();
-
-    // 2. If data’s code point length divides by 4 leaving no remainder, then:
-    if (data.length() % 4 == 0) {
-        // If data ends with one or two U+003D (=) code points, then remove them from data.
-        if (data.ends_with("=="sv))
-            data = data.substring_view(0, data.length() - 2);
-        else if (data.ends_with('='))
-            data = data.substring_view(0, data.length() - 1);
-    }
-
-    // 3. If data’s code point length divides by 4 leaving a remainder of 1, then return failure.
-    if (data.length() % 4 == 1)
-        return Error::from_string_literal("Invalid input length in forgiving base64 decode");
-
-    // 4. If data contains a code point that is not one of
-    //     U+002B (+), U+002F (/), ASCII alphanumeric
-    // then return failure.
-    for (auto point : data) {
-        if (point != '+' && point != '/' && !is_ascii_alphanumeric(point))
-            return Error::from_string_literal("Invalid character in forgiving base64 decode");
-    }
-
-    // 5. Let output be an empty byte sequence.
-    // 6. Let buffer be an empty buffer that can have bits appended to it.
-    Vector<u8> output;
-    u32 buffer = 0;
-    auto accumulated_bits = 0;
-
-    auto add_to_buffer = [&](u8 number) {
-        VERIFY(number < 64);
-        u32 buffer_mask = number;
-
-        if (accumulated_bits == 0)
-            buffer_mask <<= 18;
-        else if (accumulated_bits == 6)
-            buffer_mask <<= 12;
-        else if (accumulated_bits == 12)
-            buffer_mask <<= 6;
-        else if (accumulated_bits == 18)
-            buffer_mask <<= 0;
-
-        buffer |= buffer_mask;
-
-        accumulated_bits += 6;
-    };
-
-    auto append_bytes = [&]() {
-        output.append(static_cast<u8>((buffer & 0xff0000) >> 16));
-        output.append(static_cast<u8>((buffer & 0xff00) >> 8));
-        output.append(static_cast<u8>(buffer & 0xff));
-
-        buffer = 0;
-        accumulated_bits = 0;
-    };
-
-    auto alphabet_lookup_table = base64_lookup_table();
-
-    // 7. Let position be a position variable for data, initially pointing at the start of data.
-    // 8. While position does not point past the end of data:
-    for (auto point : data) {
-        // 1. Find the code point pointed to by position in the second column of Table 1: The Base 64 Alphabet of RFC 4648.
-        //    Let n be the number given in the first cell of the same row. [RFC4648]
-        auto n = alphabet_lookup_table[point];
-        VERIFY(n >= 0);
-
-        // 2. Append the six bits corresponding to n, most significant bit first, to buffer.
-        add_to_buffer(static_cast<u8>(n));
-
-        // 3. buffer has accumulated 24 bits,
-        if (accumulated_bits == 24) {
-            // interpret them as three 8-bit big-endian numbers.
-            // Append three bytes with values equal to those numbers to output, in the same order, and then empty buffer
-            append_bytes();
-        }
-    }
-
-    // 9. If buffer is not empty, it contains either 12 or 18 bits.
-    VERIFY(accumulated_bits == 0 || accumulated_bits == 12 || accumulated_bits == 18);
-
-    // If it contains 12 bits, then discard the last four and interpret the remaining eight as an 8-bit big-endian number.
-    if (accumulated_bits == 12)
-        output.append(static_cast<u8>((buffer & 0xff0000) >> 16));
-
-    // If it contains 18 bits, then discard the last two and interpret the remaining 16 as two 8-bit big-endian numbers.
-    // Append the one or two bytes with values equal to those one or two numbers to output, in the same order.
-    if (accumulated_bits == 18) {
-        output.append(static_cast<u8>((buffer & 0xff0000) >> 16));
-        output.append(static_cast<u8>((buffer & 0xff00) >> 8));
-    }
-
-    return ByteBuffer::copy(output);
-}
-
 }
diff --git a/AK/Base64.h b/AK/Base64.h
index 5e2592a659..3dbf8e3385 100644
--- a/AK/Base64.h
+++ b/AK/Base64.h
@@ -40,8 +40,6 @@ consteval auto base64_lookup_table()
 
 [[nodiscard]] ErrorOr<ByteBuffer> decode_base64(StringView);
 
-[[nodiscard]] ErrorOr<ByteBuffer> decode_forgiving_base64(StringView);
-
 [[nodiscard]] ErrorOr<String> encode_base64(ReadonlyBytes);
 }