Usermode/Applications/axwin4_src/Common/serialisation.cpp

   1 /*
   2  * Acess2 GUI v4
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * serialisation.cpp
   6  * - IPC Serialisation
   7  */
   8 #include <serialisation.hpp>
   9 #include <cstddef>
  10 #include <stdexcept>
  11 #include <acess/sys.h>  // SysDebug
  12
  13 namespace AxWin {
  14
  15 CDeserialiser::CDeserialiser(const ::std::vector<uint8_t>& vector):
  16         m_vect(vector),
  17         m_offset(0)
  18 {
  19 }
  20 CDeserialiser::CDeserialiser(::std::vector<uint8_t>&& vector):
  21         m_vect(vector),
  22         m_offset(0)
  23 {
  24 }
  25 CDeserialiser& CDeserialiser::operator=(const CDeserialiser& x)
  26 {
  27         m_vect = x.m_vect;
  28         m_offset = x.m_offset;
  29 }
  30
  31 bool CDeserialiser::IsConsumed() const
  32 {
  33         return m_offset == m_vect.size();
  34 }
  35
  36 ::uint8_t CDeserialiser::ReadU8()
  37 {
  38         RangeCheck("CDeserialiser::ReadU8", 1);
  39         uint8_t rv = m_vect[m_offset];
  40         m_offset ++;
  41         return rv;
  42 }
  43
  44 ::uint16_t CDeserialiser::ReadU16()
  45 {
  46         RangeCheck("CDeserialiser::ReadU16", 2);
  47         uint16_t rv = m_vect[m_offset] | ((uint16_t)m_vect[m_offset+1] << 8);
  48         m_offset += 2;
  49         return rv;
  50 }
  51
  52 ::int16_t CDeserialiser::ReadS16()
  53 {
  54         uint16_t rv_u = ReadU16();
  55         if( rv_u < 0x8000 )
  56                 return rv_u;
  57         else
  58                 return ~rv_u + 1;
  59 }
  60
  61 const ::std::vector<uint8_t> CDeserialiser::ReadBuffer()
  62 {
  63         RangeCheck("CDeserialiser::ReadBuffer(len)", 2);
  64         size_t  size = ReadU16();
  65
  66         auto range_start = m_vect.begin() + int(m_offset);
  67         ::std::vector<uint8_t> ret( range_start, range_start + int(size) );
  68         m_offset += size;
  69         return ret;
  70 }
  71
  72 const ::std::string CDeserialiser::ReadString()
  73 {
  74         RangeCheck("CDeserialiser::ReadString(len)", 1);
  75         uint8_t len = ReadU8();
  76
  77         RangeCheck("CDeserialiser::ReadString(data)", len);
  78         ::std::string ret( reinterpret_cast<const char*>(m_vect.data()+m_offset), len );
  79         m_offset += len;
  80         return ret;
  81 }
  82
  83 void CDeserialiser::RangeCheck(const char *Method, size_t bytes) throw(::std::out_of_range)
  84 {
  85         if( m_offset + bytes > m_vect.size() ) {
  86                 ::_SysDebug("%s - out of range %i+%i >= %i", Method, m_offset, bytes, m_vect.size());
  87                 throw ::std::out_of_range(Method);
  88         }
  89 }
  90
  91 CSerialiser::CSerialiser()
  92 {
  93 }
  94
  95 void CSerialiser::WriteU8(::uint8_t Value)
  96 {
  97         m_data.push_back(Value);
  98 }
  99
 100 void CSerialiser::WriteU16(::uint16_t Value)
 101 {
 102         m_data.push_back(Value & 0xFF);
 103         m_data.push_back(Value >> 8);
 104 }
 105
 106 void CSerialiser::WriteS16(::int16_t Value)
 107 {
 108         if( Value < 0 )
 109         {
 110                 ::uint16_t rawval = 0x10000 - (::int32_t)Value;
 111                 WriteU16(rawval);
 112         }
 113         else
 114         {
 115                 WriteU16(Value);
 116         }
 117 }
 118
 119 void CSerialiser::WriteBuffer(size_t n, const void* val)
 120 {
 121         const uint8_t*  val8 = static_cast<const uint8_t*>(val);
 122         if( n > 0xFFFF )
 123                 throw ::std::length_error("CSerialiser::WriteBuffer");
 124         m_data.reserve( m_data.size() + 2 + n );
 125         WriteU16(n);
 126         for( size_t i = 0; i < n; i ++ )
 127                 m_data.push_back(val8[i]);
 128 }
 129
 130 void CSerialiser::WriteString(const char* val, size_t n)
 131 {
 132         if( n > 0xFF )
 133                 throw ::std::length_error("CSerialiser::WriteString");
 134         m_data.reserve( m_data.size() + 1 + n );
 135         WriteU8(n);
 136         for( size_t i = 0; i < n; i ++ )
 137                 m_data.push_back(val[i]);
 138 }
 139
 140 void CSerialiser::WriteSub(const CSerialiser& val)
 141 {
 142         // TODO: Append reference to sub-buffer contents
 143         m_data.reserve( m_data.size() + val.m_data.size() );
 144         for( auto byte : val.m_data )
 145                 m_data.push_back( byte );
 146 }
 147
 148 const ::std::vector<uint8_t>& CSerialiser::Compact()
 149 {
 150         return m_data;
 151 }
 152
 153 };      // namespace AxWin
 154