other-licenses/7zstub/src/7zip/Archive/7z/7zMethodID.cpp

   1 // 7zMethodID.cpp
   2
   3 #include "StdAfx.h"
   4
   5 #include "7zMethodID.h"
   6
   7 namespace NArchive {
   8 namespace N7z {
   9
  10 static wchar_t GetHex(Byte value)
  11 {
  12   return (value < 10) ? ('0' + value) : ('A' + (value - 10));
  13 }
  14
  15 static bool HexCharToInt(wchar_t value, Byte &result)
  16 {
  17   if (value >= '0' && value <= '9')
  18     result = value - '0';
  19   else if (value >= 'a' && value <= 'f')
  20     result = 10 + value - 'a';
  21   else if (value >= 'A' && value <= 'F')
  22     result = 10 + value - 'A';
  23   else
  24     return false;
  25   return true;
  26 }
  27
  28 static bool TwoHexCharsToInt(wchar_t valueHigh, wchar_t valueLow, Byte &result)
  29 {
  30   Byte resultHigh, resultLow;
  31   if (!HexCharToInt(valueHigh, resultHigh))
  32     return false;
  33   if (!HexCharToInt(valueLow, resultLow))
  34     return false;
  35   result = (resultHigh << 4) + resultLow;
  36   return true;
  37 }
  38
  39 UString CMethodID::ConvertToString() const
  40 {
  41   UString result;
  42   for (int i = 0; i < IDSize; i++)
  43   {
  44     Byte b = ID[i];
  45     result += GetHex(b >> 4);
  46     result += GetHex(b & 0xF);
  47   }
  48   return result;
  49 }
  50
  51 bool CMethodID::ConvertFromString(const UString &srcString)
  52 {
  53   int length = srcString.Length();
  54   if ((length & 1) != 0 || (length >> 1) > kMethodIDSize)
  55     return false;
  56   IDSize = length / 2;
  57   UInt32 i;
  58   for(i = 0; i < IDSize; i++)
  59     if (!TwoHexCharsToInt(srcString[i * 2], srcString[i * 2 + 1], ID[i]))
  60       return false;
  61   for(; i < kMethodIDSize; i++)
  62     ID[i] = 0;
  63   return true;
  64 }
  65
  66 bool operator==(const CMethodID &a1, const CMethodID &a2)
  67 {
  68   if (a1.IDSize != a2.IDSize)
  69     return false;
  70   for (UInt32 i = 0; i < a1.IDSize; i++)
  71     if (a1.ID[i] != a2.ID[i])
  72       return false;
  73   return true;
  74 }
  75
  76 }}