edponce commented on a change in pull request #11064:
URL: https://github.com/apache/arrow/pull/11064#discussion_r700690054
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File path: cpp/src/arrow/util/value_parsing.h
##########
@@ -273,6 +273,96 @@ inline bool ParseUnsigned(const char* s, size_t length,
uint64_t* out) {
#undef PARSE_UNSIGNED_ITERATION
#undef PARSE_UNSIGNED_ITERATION_LAST
+#define PARSE_HEX_ITERATION(C_TYPE) \
+ if (length > 0) { \
+ char val = *s; \
+ s++; \
+ result = static_cast<C_TYPE>(result << 4); \
+ length--; \
+ if (val >= '0' && val <= '9'){ \
+ result = static_cast<C_TYPE>(result | (val -'0')); \
+ } else if (val >= 'A' && val <= 'F'){ \
+ result = static_cast<C_TYPE>(result | (val -'A' + 10)); \
+ } else if (val >= 'a' && val <= 'f'){ \
+ result = static_cast<C_TYPE>(result | (val -'a' + 10)); \
+ } else { \
+ /* Non-digit */ \
+ return false; \
+ } \
+ } else { \
+ break; \
+ }
+
+
+inline bool ParseHex(const char* s, size_t length, uint8_t* out) {
+ uint8_t result = 0;
Review comment:
Instead of having multiple functions for each type, I suggest to use
templates, and, given that each function is conceptually doing the same
operation but different number of times based on the output data type width,
use a for-loop instead.
```c++
template <typename T>
inline bool ParseHex(...) {
...
for (int i = 0; i < sizeof(T) * 2; ++i) {
ParseHexIteration<T>(result);
}
...
}
```
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