tor-browser

The Tor Browser
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StringToInt.cpp (3397B)

      1 // Common/StringToInt.cpp
      2 
      3 #include "StdAfx.h"
      4 
      5 #include "StringToInt.h"
      6 
      7 static const UInt32 k_UInt32_max = 0xFFFFFFFF;
      8 static const UInt64 k_UInt64_max = UINT64_CONST(0xFFFFFFFFFFFFFFFF);
      9 // static const UInt64 k_UInt64_max = (UInt64)(Int64)-1;
     10 
     11 #define CONVERT_STRING_TO_UINT_FUNC(uintType, charType, charTypeUnsigned) \
     12  uintType ConvertStringTo ## uintType(const charType *s, const charType **end) throw() { \
     13    if (end) *end = s; \
     14    uintType res = 0; \
     15    for (;; s++) { \
     16      charTypeUnsigned c = (charTypeUnsigned)*s; \
     17      if (c < '0' || c > '9') { if (end) *end = s; return res; } \
     18      if (res > (k_ ## uintType ## _max) / 10) return 0; \
     19      res *= 10; \
     20      unsigned v = (c - '0'); \
     21      if (res > (k_ ## uintType ## _max) - v) return 0; \
     22      res += v; }}
     23 
     24 CONVERT_STRING_TO_UINT_FUNC(UInt32, char, Byte)
     25 CONVERT_STRING_TO_UINT_FUNC(UInt32, wchar_t, wchar_t)
     26 CONVERT_STRING_TO_UINT_FUNC(UInt64, char, Byte)
     27 CONVERT_STRING_TO_UINT_FUNC(UInt64, wchar_t, wchar_t)
     28 
     29 Int32 ConvertStringToInt32(const wchar_t *s, const wchar_t **end) throw()
     30 {
     31  if (end)
     32    *end = s;
     33  const wchar_t *s2 = s;
     34  if (*s == '-')
     35    s2++;
     36  if (*s2 == 0)
     37    return 0;
     38  const wchar_t *end2;
     39  UInt32 res = ConvertStringToUInt32(s2, &end2);
     40  if (*s == '-')
     41  {
     42    if (res > ((UInt32)1 << (32 - 1)))
     43      return 0;
     44  }
     45  else if ((res & ((UInt32)1 << (32 - 1))) != 0)
     46    return 0;
     47  if (end)
     48    *end = end2;
     49  if (*s == '-')
     50    return -(Int32)res;
     51  return (Int32)res;
     52 }
     53 
     54 UInt32 ConvertOctStringToUInt32(const char *s, const char **end) throw()
     55 {
     56  if (end)
     57    *end = s;
     58  UInt32 res = 0;
     59  for (;; s++)
     60  {
     61    unsigned c = (unsigned char)*s;
     62    if (c < '0' || c > '7')
     63    {
     64      if (end)
     65        *end = s;
     66      return res;
     67    }
     68    if ((res & (UInt32)7 << (32 - 3)) != 0)
     69      return 0;
     70    res <<= 3;
     71    res |= (unsigned)(c - '0');
     72  }
     73 }
     74 
     75 UInt64 ConvertOctStringToUInt64(const char *s, const char **end) throw()
     76 {
     77  if (end)
     78    *end = s;
     79  UInt64 res = 0;
     80  for (;; s++)
     81  {
     82    unsigned c = (unsigned char)*s;
     83    if (c < '0' || c > '7')
     84    {
     85      if (end)
     86        *end = s;
     87      return res;
     88    }
     89    if ((res & (UInt64)7 << (64 - 3)) != 0)
     90      return 0;
     91    res <<= 3;
     92    res |= (unsigned)(c - '0');
     93  }
     94 }
     95 
     96 UInt32 ConvertHexStringToUInt32(const char *s, const char **end) throw()
     97 {
     98  if (end)
     99    *end = s;
    100  UInt32 res = 0;
    101  for (;; s++)
    102  {
    103    unsigned c = (Byte)*s;
    104    unsigned v;
    105    if (c >= '0' && c <= '9') v = (c - '0');
    106    else if (c >= 'A' && c <= 'F') v = 10 + (c - 'A');
    107    else if (c >= 'a' && c <= 'f') v = 10 + (c - 'a');
    108    else
    109    {
    110      if (end)
    111        *end = s;
    112      return res;
    113    }
    114    if ((res & (UInt32)0xF << (32 - 4)) != 0)
    115      return 0;
    116    res <<= 4;
    117    res |= v;
    118  }
    119 }
    120 
    121 UInt64 ConvertHexStringToUInt64(const char *s, const char **end) throw()
    122 {
    123  if (end)
    124    *end = s;
    125  UInt64 res = 0;
    126  for (;; s++)
    127  {
    128    unsigned c = (Byte)*s;
    129    unsigned v;
    130    if (c >= '0' && c <= '9') v = (c - '0');
    131    else if (c >= 'A' && c <= 'F') v = 10 + (c - 'A');
    132    else if (c >= 'a' && c <= 'f') v = 10 + (c - 'a');
    133    else
    134    {
    135      if (end)
    136        *end = s;
    137      return res;
    138    }
    139    if ((res & (UInt64)0xF << (64 - 4)) != 0)
    140      return 0;
    141    res <<= 4;
    142    res |= v;
    143  }
    144 }