xref: /aosp_15_r20/external/lzma/CPP/7zip/UI/FileManager/SplitUtils.cpp (revision f6dc9357d832569d4d1f5d24eacdb3935a1ae8e6)

// SplitUtils.cpp

#include "StdAfx.h"

#include "../../../Common/StringToInt.h"

#include "SplitUtils.h"

bool ParseVolumeSizes(const UString &s, CRecordVector<UInt64> &values)
{
  values.Clear();
  bool prevIsNumber = false;
  for (unsigned i = 0; i < s.Len();)
  {
    wchar_t c = s[i++];
    if (c == L' ')
      continue;
    if (c == L'-')
      return true;
    if (prevIsNumber)
    {
      prevIsNumber = false;
      unsigned numBits = 0;
      switch (MyCharLower_Ascii(c))
      {
        case 'b': continue;
        case 'k': numBits = 10; break;
        case 'm': numBits = 20; break;
        case 'g': numBits = 30; break;
        case 't': numBits = 40; break;
      }
      if (numBits != 0)
      {
        UInt64 &val = values.Back();
        if (val >= ((UInt64)1 << (64 - numBits)))
          return false;
        val <<= numBits;

        for (; i < s.Len(); i++)
          if (s[i] == L' ')
            break;
        continue;
      }
    }
    i--;
    const wchar_t *start = s.Ptr(i);
    const wchar_t *end;
    UInt64 val = ConvertStringToUInt64(start, &end);
    if (start == end)
      return false;
    if (val == 0)
      return false;
    values.Add(val);
    prevIsNumber = true;
    i += (unsigned)(end - start);
  }
  return true;
}


static const char * const k_Sizes[] =
{
    "10M"
  , "100M"
  , "1000M"
  , "650M - CD"
  , "700M - CD"
  , "4092M - FAT"
  , "4480M - DVD"     //  4489 MiB limit
  , "8128M - DVD DL"  //  8147 MiB limit
  , "23040M - BD"     // 23866 MiB limit
  // , "1457664 - 3.5\" floppy"
};

void AddVolumeItems(NWindows::NControl::CComboBox &combo)
{
  for (unsigned i = 0; i < Z7_ARRAY_SIZE(k_Sizes); i++)
    combo.AddString(CSysString(k_Sizes[i]));
}

UInt64 GetNumberOfVolumes(UInt64 size, const CRecordVector<UInt64> &volSizes)
{
  if (size == 0 || volSizes.Size() == 0)
    return 1;
  FOR_VECTOR (i, volSizes)
  {
    UInt64 volSize = volSizes[i];
    if (volSize >= size)
      return i + 1;
    size -= volSize;
  }
  UInt64 volSize = volSizes.Back();
  if (volSize == 0)
    return (UInt64)(Int64)-1;
  return volSizes.Size() + (size - 1) / volSize + 1;
}