3.13

7zip/Archive/7z/7zMethodID.cpp

@@ -0,0 +1,68 @@
+// 7zMethodID.cpp
+
+#include "StdAfx.h"
+
+#include "7zMethodID.h"
+
+namespace NArchive {
+namespace N7z {
+
+static inline wchar_t GetHex(BYTE value)
+{
+  return (value < 10) ? ('0' + value) : ('A' + (value - 10));
+}
+
+static bool HexCharToInt(wchar_t value, BYTE &result)
+{
+  if (value >= '0' && value <= '9')
+    result = value - '0';
+  else if (value >= 'a' && value <= 'f')
+    result = 10 + value - 'a';
+  else if (value >= 'A' && value <= 'F')
+    result = 10 + value - 'A';
+  else
+    return false;
+  return true;
+}
+
+static bool TwoHexCharsToInt(wchar_t valueHigh, wchar_t valueLow, BYTE &result)
+{
+  BYTE resultHigh, resultLow;
+  if (!HexCharToInt(valueHigh, resultHigh))
+    return false;
+  if (!HexCharToInt(valueLow, resultLow))
+    return false;
+  result = (resultHigh << 4) + resultLow;
+  return true;
+}
+
+UString CMethodID::ConvertToString() const
+{
+  UString result;
+  for (int i = 0; i < IDSize; i++)
+  {
+    BYTE b = ID[i];
+    result += GetHex(b >> 4);
+    result += GetHex(b & 0xF);
+  }
+  return result;
+}
+
+bool CMethodID::ConvertFromString(const UString &srcString)
+{
+  int length = srcString.Length();
+  if ((length & 1) != 0)
+    return false;
+  IDSize = length / 2;
+  if (IDSize > kMethodIDSize)
+    return false;
+  UINT32 i;
+  for(i = 0; i < IDSize; i++)
+    if (!TwoHexCharsToInt(srcString[i * 2], srcString[i * 2 + 1], ID[i]))
+      return false;
+  for(i = IDSize; i < kMethodIDSize; i++)
+    ID[i] = 0;
+  return true;
+}
+
+}}