private static int GetVal(DecodeByte decFunc, char empty, string data, ref int index)
{
int res = NoMoreData;
do
{
if (index >= data.Length)
{
break;
}
char curChar = data[index++];
if (curChar == empty)
{
return(EmptyChar);
}
res = decFunc(curChar);
} while (res == NoMoreData);
if (res < 0 && empty != Char.MinValue)
{
throw Ops.TypeError("Incorrect padding");
}
return(res);
}
private static void ProcessSuffix(CodeContext /*!*/ context, string data, DecodeByte decFunc)
{
for (int i = 0; i < data.Length; i++)
{
int current = decFunc(data[i]);
if (current >= 0 || current == InvalidByte)
{
throw Error(context, "Trailing garbage");
}
}
}
private static StringBuilder DecodeWorker(string data, char empty, DecodeByte decFunc)
{
StringBuilder res = new StringBuilder();
int i = 0;
while (i < data.Length)
{
int intVal;
int val1 = GetVal(decFunc, empty, data, ref i);
if (val1 < 0)
{
break; // no more bytes...
}
int val2 = GetVal(decFunc, empty, data, ref i);
if (val1 < 0)
{
break; // no more bytes...
}
int val3 = GetVal(decFunc, empty, data, ref i);
if (val3 < 0)
{
// 2 byte partial
intVal = (val1 << 18) | (val2 << 12);
res.Append((char)((intVal >> 16) & 0xff));
break;
}
int val4 = GetVal(decFunc, empty, data, ref i);
if (val4 < 0)
{
// 3 byte partial
intVal = (val1 << 18) | (val2 << 12) | (val3 << 6);
res.Append((char)((intVal >> 16) & 0xff));
res.Append((char)((intVal >> 8) & 0xff));
break;
}
// full 4-bytes
intVal = (val1 << 18) | (val2 << 12) | (val3 << 6) | (val4);
res.Append((char)((intVal >> 16) & 0xff));
res.Append((char)((intVal >> 8) & 0xff));
res.Append((char)(intVal & 0xff));
}
return(res);
}
private static string RemovePrefix(CodeContext /*!*/ context, string data, DecodeByte decFunc)
{
int count = 0;
while (count < data.Length)
{
int current = decFunc(data[count]);
if (current == InvalidByte)
{
throw Error(context, "Illegal char");
}
if (current >= 0)
{
break;
}
count++;
}
return(count == 0 ? data : data.Substring(count));
}
private static StringBuilder DecodeWorker(CodeContext /*!*/ context, string data, bool bounded, DecodeByte decFunc)
{
StringBuilder res = new StringBuilder();
int i = 0;
while (i < data.Length)
{
int intVal;
int val0 = GetVal(context, data, 0, bounded, ref i, decFunc);
if (val0 < 0)
{
break; // no more bytes...
}
int val1 = GetVal(context, data, 1, bounded, ref i, decFunc);
if (val1 < 0)
{
break; // no more bytes...
}
int val2 = GetVal(context, data, 2, bounded, ref i, decFunc);
if (val2 < 0)
{
// 2 byte partial
intVal = (val0 << 18) | (val1 << 12);
res.Append((char)((intVal >> 16) & 0xff));
break;
}
int val3 = GetVal(context, data, 3, bounded, ref i, decFunc);
if (val3 < 0)
{
// 3 byte partial
intVal = (val0 << 18) | (val1 << 12) | (val2 << 6);
res.Append((char)((intVal >> 16) & 0xff));
res.Append((char)((intVal >> 8) & 0xff));
break;
}
// full 4-bytes
intVal = (val0 << 18) | (val1 << 12) | (val2 << 6) | (val3);
res.Append((char)((intVal >> 16) & 0xff));
res.Append((char)((intVal >> 8) & 0xff));
res.Append((char)(intVal & 0xff));
}
return(res);
}
private static int GetVal(CodeContext /*!*/ context, string data, int align, bool bounded, ref int index, DecodeByte decFunc)
{
int res;
while (true)
{
res = NextVal(context, data, ref index, decFunc);
switch (res)
{
case PadByte:
switch (align)
{
case 0:
case 1:
CountPadBytes(context, data, -1, ref index, decFunc);
continue;
case 2:
if (CountPadBytes(context, data, 1, ref index, decFunc) > 0)
{
return(NoMoreBytes);
}
else
{
continue;
}
default:
return(NoMoreBytes);
}
case NoMoreBytes:
if (bounded || align == 0)
{
return(NoMoreBytes);
}
else
{
throw Error(context, "Incorrect padding");
}
case EmptyByte:
return(0);
default:
return(res);
}
}
}
private static int CountPadBytes(CodeContext /*!*/ context, string data, int bound, ref int index, DecodeByte decFunc)
{
int res = PadByte;
int count = 0;
while ((bound < 0 || count < bound) &&
(res = NextVal(context, data, ref index, decFunc)) == PadByte)
{
count++;
}
// we only want NextVal() to eat PadBytes - not real data
if (res != PadByte && res != NoMoreBytes)
{
index--;
}
return(count);
}
private const int NoMoreBytes = -5; // signals end of stream
private static int NextVal(CodeContext /*!*/ context, string data, ref int index, DecodeByte decFunc)
{
int res;
while (index < data.Length)
{
res = decFunc(data[index++]);
switch (res)
{
case EmptyByte:
return(0);
case InvalidByte:
throw Error(context, "Illegal char");
case IgnoreByte:
break;
default:
return(res);
}
}
return(NoMoreBytes);
}
private static StringBuilder DecodeWorker(string data, char empty, DecodeByte decFunc) {
StringBuilder res = new StringBuilder();
int i = 0;
while (i < data.Length) {
int intVal;
int val1 = GetVal(decFunc, empty, data, ref i);
if (val1 < 0) break; // no more bytes...
int val2 = GetVal(decFunc, empty, data, ref i);
if (val1 < 0) break; // no more bytes...
int val3 = GetVal(decFunc, empty, data, ref i);
if (val3 < 0) {
// 2 byte partial
intVal = (val1 << 18) | (val2 << 12);
res.Append((char)((intVal >> 16) & 0xff));
break;
}
int val4 = GetVal(decFunc, empty, data, ref i);
if (val4 < 0) {
// 3 byte partial
intVal = (val1 << 18) | (val2 << 12) | (val3 << 6);
res.Append((char)((intVal >> 16) & 0xff));
res.Append((char)((intVal >> 8) & 0xff));
break;
}
// full 4-bytes
intVal = (val1 << 18) | (val2 << 12) | (val3 << 6) | (val4);
res.Append((char)((intVal >> 16) & 0xff));
res.Append((char)((intVal >> 8) & 0xff));
res.Append((char)(intVal & 0xff));
}
return res;
}
private static int GetVal(DecodeByte decFunc, char empty, string data, ref int index) {
int res = NoMoreData;
do {
if (index >= data.Length) break;
char curChar = data[index++];
if (curChar == empty) return EmptyChar;
res = decFunc(curChar);
} while (res == NoMoreData);
if (res < 0 && empty != Char.MinValue) throw PythonOps.TypeError("Incorrect padding");
return res;
}
private static void ProcessSuffix(CodeContext/*!*/ context, string data, DecodeByte decFunc) {
for (int i = 0; i < data.Length; i++) {
int current = decFunc(data[i]);
if (current >= 0 || current == InvalidByte) {
throw Error(context, "Trailing garbage");
}
}
}
private static string RemovePrefix(CodeContext/*!*/ context, string data, DecodeByte decFunc) {
int count = 0;
while (count < data.Length) {
int current = decFunc(data[count]);
if (current == InvalidByte) {
throw Error(context, "Illegal char");
}
if (current >= 0) break;
count++;
}
return count == 0 ? data : data.Substring(count);
}
private static StringBuilder DecodeWorker(CodeContext/*!*/ context, string data, bool bounded, DecodeByte decFunc) {
StringBuilder res = new StringBuilder();
int i = 0;
while (i < data.Length) {
int intVal;
int val0 = GetVal(context, data, 0, bounded, ref i, decFunc);
if (val0 < 0) break; // no more bytes...
int val1 = GetVal(context, data, 1, bounded, ref i, decFunc);
if (val1 < 0) break; // no more bytes...
int val2 = GetVal(context, data, 2, bounded, ref i, decFunc);
if (val2 < 0) {
// 2 byte partial
intVal = (val0 << 18) | (val1 << 12);
res.Append((char)((intVal >> 16) & 0xff));
break;
}
int val3 = GetVal(context, data, 3, bounded, ref i, decFunc);
if (val3 < 0) {
// 3 byte partial
intVal = (val0 << 18) | (val1 << 12) | (val2 << 6);
res.Append((char)((intVal >> 16) & 0xff));
res.Append((char)((intVal >> 8) & 0xff));
break;
}
// full 4-bytes
intVal = (val0 << 18) | (val1 << 12) | (val2 << 6) | (val3);
res.Append((char)((intVal >> 16) & 0xff));
res.Append((char)((intVal >> 8) & 0xff));
res.Append((char)(intVal & 0xff));
}
return res;
}
private static int GetVal(CodeContext/*!*/ context, string data, int align, bool bounded, ref int index, DecodeByte decFunc) {
int res;
while (true) {
res = NextVal(context, data, ref index, decFunc);
switch (res) {
case PadByte:
switch (align) {
case 0:
case 1:
CountPadBytes(context, data, -1, ref index, decFunc);
continue;
case 2:
if (CountPadBytes(context, data, 1, ref index, decFunc) > 0) {
return NoMoreBytes;
} else {
continue;
}
default:
return NoMoreBytes;
}
case NoMoreBytes:
if (bounded || align == 0) {
return NoMoreBytes;
} else {
throw Error(context, "Incorrect padding");
}
case EmptyByte:
return 0;
default:
return res;
}
}
}
private static int CountPadBytes(CodeContext/*!*/ context, string data, int bound, ref int index, DecodeByte decFunc) {
int res = PadByte;
int count = 0;
while ((bound < 0 || count < bound) &&
(res = NextVal(context, data, ref index, decFunc)) == PadByte) {
count++;
}
// we only want NextVal() to eat PadBytes - not real data
if (res != PadByte && res != NoMoreBytes) index--;
return count;
}
private const int NoMoreBytes = -5; // signals end of stream
private static int NextVal(CodeContext/*!*/ context, string data, ref int index, DecodeByte decFunc) {
int res;
while (index < data.Length) {
res = decFunc(data[index++]);
switch (res) {
case EmptyByte:
return 0;
case InvalidByte:
throw Error(context, "Illegal char");
case IgnoreByte:
break;
default:
return res;
}
}
return NoMoreBytes;
}
