nerdcruft/libcruft-util
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utf8: clearer comments

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This commit is contained in:
Danny Robson 2017-10-03 17:48:27 +11:00
parent c61fa16316
commit d64e3d244e
1 changed files with 7 additions and 5 deletions
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12
utf8.cpp
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@ -107,10 +107,9 @@ decode (util::view<InputT> src, OutputT dst)
codepoint_t accum { PREFIX[len].value (c) };
// check every following data byte has the appropriate prefix
static constexpr auto CONTINUATION = "0b10xxxxxx"_test;
// prepend each of the remaining bytes data to an accumulator
for (int i = 1; i <= len; ++i) {
static constexpr auto CONTINUATION = "0b10xxxxxx"_test;
if (cursor == src.cend ())
throw malformed_error {};
@ -122,8 +121,11 @@ decode (util::view<InputT> src, OutputT dst)
accum |= CONTINUATION.value (now);
}
// describes the bits required to be present for a valid minimally
// sized codepoint of a given byte length.
// check that the codepoint is the right size by seeing if the unique
// bits present in the decoded size codepoint are actually used.
//
// these could theoretically be provided to the user, but they may be
// misused so we will throw an error instead.
static constexpr
codepoint_t LEVEL_MASK[] {
0b00000000'00000000'01111111,