public static int PDJPG_EncodeBaseCtx(
PDJPG_Context ctx, byte[] ibuf, BytePtr obuf,
int xs, int ys, int qf, int pf)
{
BytePtr tbuf, cs, cse, ct;
int sz;
tbuf = new BytePtr(1 << 24);
sz = PDJPG_EncodeCtx(ctx, ibuf, tbuf, xs, ys, qf, pf);
cs = tbuf; cse = tbuf + sz; ct = obuf;
if ((cs[0] == 0xFF) && (cs[1] == JPG.JPG_SOI))
cs += 2;
while (cs < cse)
{
if ((cs[0] == 0xFF) && (cs[1] == JPG.JPG_EOI))
break;
ct.emit(cs.next());
}
//free(tbuf);
return (ct - obuf);
}
public static BytePtr PDJPG_EncodeBeginLayeredCtx(
PDJPG_Context ctx, BytePtr ct, int xs, int ys, int qf)
{
ct.emit(0xFF);
ct.emit(JPG.JPG_SOI);
ct = PDJPG_EmitMarkerJFIF(ctx, ct);
return ct;
}
public static BytePtr PDJPG_EmitTagLayer(PDJPG_Context ctx,
BytePtr ct, string name)
{
BytePtr ctt;
int i;
//ctx.huff.ct = ct; ctx.huff.win = 0; ctx.huff.pos = 0;
//ctx.huff.InitOutputStream(ctx, ct);
ct.emit(0xFF);
ct.emit(JPG.JPG_APP11);
ctt = ct;
ct.emit(0x00);
ct.emit(0x00);
ct.EmitString("TagLayer");
ct.EmitString(name);
i = ct - ctt;
ctt[0] = (i >> 8) & 0xFF; ctt[1] = i & 0xFF;
return (ct);
}
public static BytePtr PDJPG_EmitMarkerJFIF(PDJPG_Context ctx, BytePtr ct)
{
BytePtr ctt;
int i;
if (ctx.jpg_clrtrans != PDJPG_CLRS_YCBCR)
return (ct);
//ctx.huff.ct = ct; ctx.huff.win = 0; ctx.huff.pos = 0;
//ctx.huff.InitOutputStream(ctx, ct);
ct.emit(0xFF);
ct.emit(JPG.JPG_APP0);
ctt = ct;
ct.emit(0x00);
ct.emit(0x00);
ct.EmitString("JFIF");
//PDJPG_WriteString(ctx, "JFIF");
ct.emit(0x01); //version high
ct.emit(0x02); //version low
ct.emit(0x00); //no units
ct.emit(0x00); //X density
ct.emit(0x01);
ct.emit(0x00); //Y density
ct.emit(0x01);
ct.emit(0x00); //thumbnail
ct.emit(0x00);
// ctx.huff.WriteString(ctx, name);
i = ct - ctt;
ctt[0] = (i >> 8) & 0xFF; ctt[1] = i & 0xFF;
return (ct);
}
public static int PDJPG_EscapeEncodeBuffer(BytePtr ibuf, int isz,
BytePtr obuf, int osz)
{
BytePtr cs, ct, cse, cte;
cs = ibuf; cse = ibuf + isz;
ct = obuf; cte = obuf + osz;
while ((cs < cse) && (ct < cte))
{
if (cs[0] == 0xFF)
{
cs++;
ct.emit(0xFF);
ct.emit(0x00);
continue;
}
ct.emit(cs.next());
}
if (ct >= cte) return (-1);
return (ct - obuf);
}
public static int PDJPG_EscapeDecodeSingleBuffer(BytePtr buf, int sz)
{
BytePtr cs, ct, cse, cte;
cs = buf; cse = buf + sz;
ct = buf; cte = buf + sz;
while ((cs < cse) && (ct < cte))
{
if ((cs[0] == 0xFF) && (cs[1] == 0x00))
{ cs += 2; ct.emit(0xFF); continue; }
if ((cs[0] == 0xFF) && (cs[1] <= 0x0F))
{ ct.emit(0xFF); ct.emit(cs[1] - 1); cs += 2; continue; }
ct.emit(cs.next());
}
if (ct >= cte) return (-1);
return (ct - buf);
}
public static BytePtr PDJPG_EncodeEndLayeredCtx(
PDJPG_Context ctx, BytePtr ct)
{
ct.emit(0xFF);
ct.emit(JPG.JPG_EOI);
return ct;
}