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[ADT] Support converting to lowercase string in toHex 

This is useful in certain use-cases such as D51833.

Differential Revision: https://reviews.llvm.org/D51835

llvm-svn: 341852
This commit is contained in:
Petr Hosek 2018-09-10 19:34:44 +00:00
parent 59b57c39fb
commit 72dc29a848
2 changed files with 8 additions and 5 deletions
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11
llvm/include/llvm/ADT/StringExtras.h
View File

@ -139,22 +139,23 @@ inline std::string utohexstr(uint64_t X, bool LowerCase = false) {
/// Convert buffer \p Input to its hexadecimal representation.
/// The returned string is double the size of \p Input.
inline std::string toHex(StringRef Input) {
inline std::string toHex(StringRef Input, bool LowerCase = false) {
static const char *const LUT = "0123456789ABCDEF";
const uint8_t Offset = LowerCase ? 32 : 0;
size_t Length = Input.size();
std::string Output;
Output.reserve(2 * Length);
for (size_t i = 0; i < Length; ++i) {
const unsigned char c = Input[i];
Output.push_back(LUT[c >> 4]);
Output.push_back(LUT[c & 15]);
Output.push_back(LUT[c >> 4] | Offset);
Output.push_back(LUT[c & 15] | Offset);
}
return Output;
}
inline std::string toHex(ArrayRef<uint8_t> Input) {
return toHex(toStringRef(Input));
inline std::string toHex(ArrayRef<uint8_t> Input, bool LowerCase = false) {
return toHex(toStringRef(Input), LowerCase);
}
inline uint8_t hexFromNibbles(char MSB, char LSB) {

2
llvm/unittests/ADT/StringExtrasTest.cpp
View File

@ -70,6 +70,7 @@ TEST(StringExtrasTest, ToAndFromHex) {
OddBytes.size());
EXPECT_EQ(OddStr, toHex(OddData));
EXPECT_EQ(OddData, fromHex(StringRef(OddStr).drop_front()));
EXPECT_EQ(StringRef(OddStr).lower(), toHex(OddData, true));
std::vector<uint8_t> EvenBytes = {0xA5, 0xBD, 0x0D, 0x3E, 0xCD};
std::string EvenStr = "A5BD0D3ECD";
@ -77,6 +78,7 @@ TEST(StringExtrasTest, ToAndFromHex) {
EvenBytes.size());
EXPECT_EQ(EvenStr, toHex(EvenData));
EXPECT_EQ(EvenData, fromHex(EvenStr));
EXPECT_EQ(StringRef(EvenStr).lower(), toHex(EvenData, true));
}
TEST(StringExtrasTest, to_float) {