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AK: StringUtils, add "convert_to_uint_from_hex" method

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New method to convert hex string unsigned integer.
This commit is contained in:
Hüseyin ASLITÜRK 2020-05-20 21:20:43 +03:00 committed by Andreas Kling
parent 9300a8cfe5
commit 738235574f
Notes: sideshowbarker 2024-07-19 06:18:32 +09:00 
Author: https://github.com/asliturk
Commit: https://github.com/SerenityOS/serenity/commit/738235574f3
Pull-request: https://github.com/SerenityOS/serenity/pull/2310
Reviewed-by: https://github.com/linusg
2 changed files with 33 additions and 1 deletions
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32
AK/StringUtils.cpp
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@ -143,6 +143,38 @@ unsigned convert_to_uint(const StringView& str, bool& ok)
return value;
}
unsigned convert_to_uint_from_hex(const StringView& str, bool& ok)
{
if (str.is_empty()) {
ok = false;
return 0;
}
unsigned value = 0;
const auto count = str.length();
for (size_t i = 0; i < count; i++) {
char digit = str[i];
u8 digit_val;
if (digit >= '0' && digit <= '9') {
digit_val = digit - '0';
} else if (digit >= 'a' && digit <= 'f') {
digit_val = 10 + (digit - 'a');
} else if (digit >= 'A' && digit <= 'F') {
digit_val = 10 + (digit - 'A');
} else {
ok = false;
return 0;
}
value = (value << 4) + digit_val;
}
ok = true;
return value;
}
static inline char to_lowercase(char c)
{
if (c >= 'A' && c <= 'Z')

2
AK/StringUtils.h
View file

@ -41,8 +41,8 @@ namespace StringUtils {
bool matches(const StringView& str, const StringView& mask, CaseSensitivity = CaseSensitivity::CaseInsensitive);
int convert_to_int(const StringView&, bool& ok);
unsigned convert_to_uint(const StringView&, bool& ok);
unsigned convert_to_uint_from_hex(const StringView&, bool& ok);
bool equals_ignoring_case(const StringView&, const StringView&);
}
}