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-rw-r--r--src/utilstrencodings.h30
1 files changed, 30 insertions, 0 deletions
diff --git a/src/utilstrencodings.h b/src/utilstrencodings.h
index 53da60e8f1..af33f0e5f8 100644
--- a/src/utilstrencodings.h
+++ b/src/utilstrencodings.h
@@ -38,7 +38,13 @@ std::string SanitizeString(const std::string& str, int rule = SAFE_CHARS_DEFAULT
std::vector<unsigned char> ParseHex(const char* psz);
std::vector<unsigned char> ParseHex(const std::string& str);
signed char HexDigit(char c);
+/* Returns true if each character in str is a hex character, and has an even
+ * number of hex digits.*/
bool IsHex(const std::string& str);
+/**
+* Return true if the string is a hex number, optionally prefixed with "0x"
+*/
+bool IsHexNumber(const std::string& str);
std::vector<unsigned char> DecodeBase64(const char* p, bool* pfInvalid = nullptr);
std::string DecodeBase64(const std::string& str);
std::string EncodeBase64(const unsigned char* pch, size_t len);
@@ -143,4 +149,28 @@ bool TimingResistantEqual(const T& a, const T& b)
*/
bool ParseFixedPoint(const std::string &val, int decimals, int64_t *amount_out);
+/** Convert from one power-of-2 number base to another. */
+template<int frombits, int tobits, bool pad, typename O, typename I>
+bool ConvertBits(O& out, I it, I end) {
+ size_t acc = 0;
+ size_t bits = 0;
+ constexpr size_t maxv = (1 << tobits) - 1;
+ constexpr size_t max_acc = (1 << (frombits + tobits - 1)) - 1;
+ while (it != end) {
+ acc = ((acc << frombits) | *it) & max_acc;
+ bits += frombits;
+ while (bits >= tobits) {
+ bits -= tobits;
+ out.push_back((acc >> bits) & maxv);
+ }
+ ++it;
+ }
+ if (pad) {
+ if (bits) out.push_back((acc << (tobits - bits)) & maxv);
+ } else if (bits >= frombits || ((acc << (tobits - bits)) & maxv)) {
+ return false;
+ }
+ return true;
+}
+
#endif // BITCOIN_UTILSTRENCODINGS_H