intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 63 insertions, 0 deletions

diff --git a/util/string/hex.cpp b/util/string/hex.cpp
new file mode 100644
index 0000000000..667397987f
--- /dev/null
+++ b/util/string/hex.cpp
@@ -0,0 +1,63 @@
+#include "hex.h"
+
+const char* const Char2DigitTable = ("\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+                                     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+                                     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+                                     "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\xff\xff\xff\xff\xff\xff" //0-9
+                                     "\xff\x0a\x0b\x0c\x0d\x0e\x0f\xff\xff\xff\xff\xff\xff\xff\xff\xff" //A-Z
+                                     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+                                     "\xff\x0a\x0b\x0c\x0d\x0e\x0f\xff\xff\xff\xff\xff\xff\xff\xff\xff" //a-z
+                                     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+                                     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+                                     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+                                     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+                                     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+                                     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+                                     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+                                     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+                                     "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff");
+
+char* HexEncode(const void* in, size_t len, char* out) {
+    const unsigned char* b = (const unsigned char*)in;
+    const unsigned char* e = b + len;
+
+    while (b != e) {
+        *out++ = DigitToChar(*b / 16);
+        *out++ = DigitToChar(*b++ % 16);
+    }
+
+    return out;
+}
+
+void* HexDecode(const void* in, size_t len, void* ptr) {
+    const char* b = (const char*)in;
+    const char* e = b + len;
+    Y_ENSURE(!(len & 1), TStringBuf("Odd buffer length passed to HexDecode"));
+
+    char* out = (char*)ptr;
+
+    while (b != e) {
+        *out++ = (char)String2Byte(b);
+        b += 2;
+    }
+
+    return out;
+}
+
+TString HexEncode(const void* in, size_t len) {
+    TString ret;
+
+    ret.ReserveAndResize(len << 1);
+    HexEncode(in, len, ret.begin());
+
+    return ret;
+}
+
+TString HexDecode(const void* in, size_t len) {
+    TString ret;
+
+    ret.ReserveAndResize(len >> 1);
+    HexDecode(in, len, ret.begin());
+
+    return ret;
+}