HRESULT CInArchive::GetNextItem(bool &filled, CItemEx &item)
{
filled = false;
UInt32 processedSize;
Byte startHeader[2];
RINOK(ReadBytes(startHeader, 2, processedSize))
if (processedSize == 0)
return S_OK;
if (processedSize == 1)
return (startHeader[0] == 0) ? S_OK: S_FALSE;
if (startHeader[0] == 0 && startHeader[1] == 0)
return S_OK;
Byte header[256];
const UInt32 kBasicPartSize = 22;
RINOK(ReadBytes(header, kBasicPartSize, processedSize));
if (processedSize != kBasicPartSize)
return (startHeader[0] == 0) ? S_OK: S_FALSE;
const Byte *p = header;
memmove(item.Method, p, kMethodIdSize);
if (!item.IsValidMethod())
return S_OK;
p += kMethodIdSize;
p = ReadUInt32(p, item.PackSize);
p = ReadUInt32(p, item.Size);
p = ReadUInt32(p, item.ModifiedTime);
item.Attributes = *p++;
item.Level = *p++;
if (item.Level > 2)
return S_FALSE;
UInt32 headerSize;
if (item.Level < 2)
{
headerSize = startHeader[0];
if (headerSize < kBasicPartSize)
return S_FALSE;
UInt32 remain = headerSize - kBasicPartSize;
RINOK(CheckReadBytes(header + kBasicPartSize, remain));
if (startHeader[1] != CalcSum(header, headerSize))
return S_FALSE;
size_t nameLength = *p++;
if ((p - header) + nameLength + 2 > headerSize)
return S_FALSE;
p = ReadString(p, nameLength, item.Name);
}
else
headerSize = startHeader[0] | ((UInt32)startHeader[1] << 8);
p = ReadUInt16(p, item.CRC);
if (item.Level != 0)
{
if (item.Level == 2)
{
RINOK(CheckReadBytes(header + kBasicPartSize, 2));
}
if ((size_t)(p - header) + 3 > headerSize)
return S_FALSE;
item.OsId = *p++;
UInt16 nextSize;
p = ReadUInt16(p, nextSize);
while (nextSize != 0)
{
if (nextSize < 3)
return S_FALSE;
if (item.Level == 1)
{
if (item.PackSize < nextSize)
return S_FALSE;
item.PackSize -= nextSize;
}
CExtension ext;
RINOK(CheckReadBytes(&ext.Type, 1))
nextSize -= 3;
ext.Data.SetCapacity(nextSize);
RINOK(CheckReadBytes((Byte *)ext.Data, nextSize))
item.Extensions.Add(ext);
Byte hdr2[2];
RINOK(CheckReadBytes(hdr2, 2));
ReadUInt16(hdr2, nextSize);
}
}
item.DataPosition = m_Position;
filled = true;
return S_OK;
}
