intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 82 insertions, 0 deletions

diff --git a/library/cpp/uri/other.cpp b/library/cpp/uri/other.cpp
new file mode 100644
index 0000000000..b23a5b68a9
--- /dev/null
+++ b/library/cpp/uri/other.cpp
@@ -0,0 +1,82 @@
+#include "other.h"
+
+#include <util/string/util.h>
+#include <util/system/yassert.h>
+
+/********************************************************/
+/********************************************************/
+
+static const Tr InvertTr(".:/?#", "\005\004\003\002\001");
+static const Tr RevertTr("\005\004\003\002\001", ".:/?#");
+
+void TrspChars(char* s) {
+    InvertTr.Do(s);
+}
+
+void UnTrspChars(char* s) {
+    RevertTr.Do(s);
+}
+
+void TrspChars(char* s, size_t l) {
+    InvertTr.Do(s, l);
+}
+
+void UnTrspChars(char* s, size_t l) {
+    RevertTr.Do(s, l);
+}
+
+void TrspChars(const char* s, char* d) {
+    InvertTr.Do(s, d);
+}
+
+void UnTrspChars(const char* s, char* d) {
+    RevertTr.Do(s, d);
+}
+
+void InvertDomain(char* begin, char* end) {
+    // skip schema if it is present
+    const auto dotPos = TStringBuf{begin, end}.find('.');
+    if (dotPos == TStringBuf::npos)
+        return; // no need to invert anything
+    const auto schemaendPos = TStringBuf{begin, end}.find("://", 3);
+    if (schemaendPos < dotPos)
+        begin += schemaendPos + 3;
+    char* sl = (char*)memchr(begin, '/', end - begin);
+    char* cl = (char*)memchr(begin, ':', sl ? sl - begin : end - begin);
+    end = cl ? cl : (sl ? sl : end);
+
+    // invert string
+    for (size_t i = 0, n = end - begin; i < n / 2; ++i)
+        DoSwap(begin[i], begin[n - i - 1]);
+
+    // invert back each host name segment
+    char* b = begin;
+    while (true) {
+        char* e = (char*)memchr(b, '.', end - b);
+        if (!e)
+            e = end;
+        for (size_t i = 0, n = e - b; i < n / 2; ++i)
+            DoSwap(b[i], b[n - i - 1]);
+        if (e == end)
+            break;
+        b = e + 1;
+    }
+}
+
+void InvertUrl(char* begin, char* end) {
+    char* slash = strchr(begin, '/');
+    if (slash) {
+        *slash = 0;
+    }
+    strlwr(begin);
+    if (slash) {
+        *slash = '/';
+    }
+    InvertDomain(begin, end);
+    TrspChars(begin);
+}
+
+void RevertUrl(char* begin, char* end) {
+    UnTrspChars(begin);
+    InvertDomain(begin, end);
+}