/// <summary>Convert UTF8 bytes into UTF16 characters. If offset
/// is non-zero, conversion starts at that starting point
/// in utf8, re-using the results from the previous call
/// up until offset.
/// </summary>
public static void UTF8toUTF16(byte[] utf8, int offset, int length, UTF16Result result)
{
int end = offset + length;
char[] out_Renamed = result.result;
if (result.offsets.Length <= end)
{
int[] newOffsets = new int[2 * end];
Array.Copy(result.offsets, 0, newOffsets, 0, result.offsets.Length);
result.offsets = newOffsets;
}
int[] offsets = result.offsets;
// If incremental decoding fell in the middle of a
// single unicode character, rollback to its start:
int upto = offset;
while (offsets[upto] == - 1)
upto--;
int outUpto = offsets[upto];
// Pre-allocate for worst case 1-for-1
if (outUpto + length >= out_Renamed.Length)
{
char[] newOut = new char[2 * (outUpto + length)];
Array.Copy(out_Renamed, 0, newOut, 0, outUpto);
result.result = out_Renamed = newOut;
}
while (upto < end)
{
int b = utf8[upto] & 0xff;
int ch;
offsets[upto++] = outUpto;
if (b < 0xc0)
{
System.Diagnostics.Debug.Assert(b < 0x80);
ch = b;
}
else if (b < 0xe0)
{
ch = ((b & 0x1f) << 6) + (utf8[upto] & 0x3f);
offsets[upto++] = - 1;
}
else if (b < 0xf0)
{
ch = ((b & 0xf) << 12) + ((utf8[upto] & 0x3f) << 6) + (utf8[upto + 1] & 0x3f);
offsets[upto++] = - 1;
offsets[upto++] = - 1;
}
else
{
System.Diagnostics.Debug.Assert(b < 0xf8);
ch = ((b & 0x7) << 18) + ((utf8[upto] & 0x3f) << 12) + ((utf8[upto + 1] & 0x3f) << 6) + (utf8[upto + 2] & 0x3f);
offsets[upto++] = - 1;
offsets[upto++] = - 1;
offsets[upto++] = - 1;
}
if (ch <= UNI_MAX_BMP)
{
// target is a character <= 0xFFFF
out_Renamed[outUpto++] = (char) ch;
}
else
{
// target is a character in range 0xFFFF - 0x10FFFF
int chHalf = ch - HALF_BASE;
out_Renamed[outUpto++] = (char) ((chHalf >> (int) HALF_SHIFT) + UNI_SUR_HIGH_START);
out_Renamed[outUpto++] = (char) ((chHalf & HALF_MASK) + UNI_SUR_LOW_START);
}
}
offsets[upto] = outUpto;
result.length = outUpto;
}
public void CopyText(UTF16Result other)
{
SetLength(other.length);
Array.Copy(other.result, 0, result, 0, length);
}
/** Convert UTF8 bytes into UTF16 characters. If offset
* is non-zero, conversion starts at that starting point
* in utf8, re-using the results from the previous call
* up until offset. */
public static void UTF8toUTF16(/* in */ byte[] utf8, /* in */ int offset, /* in */ int length, /* in */ UTF16Result result)
{
int end = offset + length;
char[] out_Renamed = result.result;
if (result.offsets.Length <= end)
{
int[] newOffsets = new int[2 * end];
System.Array.Copy(result.offsets, 0, newOffsets, 0, result.offsets.Length);
result.offsets = newOffsets;
}
int[] offsets = result.offsets;
// If incremental decoding fell in the middle of a
// single unicode character, rollback to its start:
int upto = offset;
while (offsets[upto] == -1)
{
upto--;
}
int outUpto = offsets[upto];
// Pre-allocate for worst case 1-for-1
if (outUpto + length >= out_Renamed.Length)
{
char[] newOut = new char[2 * (outUpto + length)];
System.Array.Copy(out_Renamed, 0, newOut, 0, outUpto);
result.result = out_Renamed = newOut;
}
while (upto < end)
{
int b = utf8[upto] & 0xff;
int ch;
offsets[upto++] = outUpto;
if (b < 0xc0)
{
System.Diagnostics.Debug.Assert(b < 0x80);
ch = b;
}
else if (b < 0xe0)
{
ch = ((b & 0x1f) << 6) + (utf8[upto] & 0x3f);
offsets[upto++] = -1;
}
else if (b < 0xf0)
{
ch = ((b & 0xf) << 12) + ((utf8[upto] & 0x3f) << 6) + (utf8[upto + 1] & 0x3f);
offsets[upto++] = -1;
offsets[upto++] = -1;
}
else
{
System.Diagnostics.Debug.Assert(b < 0xf8);
ch = ((b & 0x7) << 18) + ((utf8[upto] & 0x3f) << 12) + ((utf8[upto + 1] & 0x3f) << 6) + (utf8[upto + 2] & 0x3f);
offsets[upto++] = -1;
offsets[upto++] = -1;
offsets[upto++] = -1;
}
if (ch <= UNI_MAX_BMP)
{
// target is a character <= 0xFFFF
out_Renamed[outUpto++] = (char)ch;
}
else
{
// target is a character in range 0xFFFF - 0x10FFFF
int chHalf = ch - HALF_BASE;
out_Renamed[outUpto++] = (char)((chHalf >> (int)HALF_SHIFT) + UNI_SUR_HIGH_START);
out_Renamed[outUpto++] = (char)((chHalf & HALF_MASK) + UNI_SUR_LOW_START);
}
}
offsets[upto] = outUpto;
result.length = outUpto;
}
public void copyText(UTF16Result other)
{
setLength(other.length);
System.Array.Copy(other.result, 0, result, 0, length);
}
public void CopyText(UTF16Result other)
{
SetLength(other.length);
Array.Copy(other.result, 0, result, 0, length);
}
public void copyText(UTF16Result other)
{
setLength(other.length);
System.Array.Copy(other.result, 0, result, 0, length);
}
