public override int MarkerDHT(PDJPG_Context ctx, BytePtr buf)
{
BytePtr cs;
int i, j, k, sz, tn;
sz = (ushort)((buf[0] << 8) | buf[1]);
buf += 2;
i = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
// printf("PDJPG_MarkerAPP12: %08X\n", i);
if (buf.memcmp("DRCT", 4))
return (-1);
cs = buf + 4;
i = cs.next();
k = (i >> 4) & 15;
j = i & 15;
tn = j * 2 + k;
for (i = 0; i < 256; i++)
{
rtab_len[tn * 256 + i] = 0;
}
for (i = 0; i < 256; i++)
{
j = (int)cs.ReadSVLI();
if (j <= 0)
{
if (j == 0)
break;
i += (-j) - 1;
continue;
}
rtab_len[tn * 256 + i] = j;
}
SetupRangeTable(tn);
return sz;
}
public static int PDJPG_MarkerAPP9(PDJPG_Context ctx, BytePtr buf)
{
// int i;
buf += 2;
if (!buf.memcmp("JPSERM", 6))
{
ctx.jpg_rdct = true;
return (1);
}
return (0);
}
public static int PDJPG_MarkerDMLT(PDJPG_Context ctx, BytePtr buf)
{
BytePtr cs, css;
int i, j, k, sz, sz1, tn, tag;
sz = (ushort)((buf[0] << 8) | buf[1]);
buf += 2;
i = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
// printf("PDJPG_MarkerAPP12: %08X\n", i);
if (buf.memcmp("DMLT", 4))
return (-1);
cs = buf + 4;
tag = cs.next();
sz1 = (int)cs.ReadUVLI();
css = cs;
while (tag != 0)
{
switch (tag)
{
case PDJPG_DMLT_DVFH:
ctx.dvfh_lidx = (cs[2] << 8) + cs[3];
break;
case PDJPG_DMLT_DHT0: case PDJPG_DMLT_DHT1:
case PDJPG_DMLT_DHT2: case PDJPG_DMLT_DHT3:
case PDJPG_DMLT_DHT4: case PDJPG_DMLT_DHT5:
case PDJPG_DMLT_DHT6: case PDJPG_DMLT_DHT7:
i = tag - PDJPG_DMLT_DHT0;
ctx.huff.InitStream(ctx, cs);
((PDJHUFF)ctx.huff).BSXRP_DecodeHuffTable(ctx, i);
break;
case PDJPG_DMLT_DQT0: case PDJPG_DMLT_DQT1:
case PDJPG_DMLT_DQT2: case PDJPG_DMLT_DQT3:
case PDJPG_DMLT_DQT4: case PDJPG_DMLT_DQT5:
case PDJPG_DMLT_DQT6: case PDJPG_DMLT_DQT7:
i = tag - PDJPG_DMLT_DQT0;
PDJPG_MarkerDMLT_DQT(ctx, cs, i);
break;
default:
break;
}
cs = css + sz1;
tag = cs.next();
sz1 = (int)cs.ReadUVLI();
css = cs;
}
return 1;
}
public static int PDJPG_MarkerAPP12(PDJPG_Context ctx, BytePtr buf)
{
BytePtr ob, cs, css;
int i, sz, sz1, tag;
ob = buf;
sz = (ushort)((buf[0] << 8) | buf[1]);
buf += 2;
i = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
// printf("PDJPG_MarkerAPP12: %08X\n", i);
if (!buf.memcmp("DMLT", 4))
{
i = PDJPG_MarkerDMLT(ctx, ob);
return i;
}
if (!buf.memcmp("BCST", 4))
{
ctx.bcst_version = (ushort)((buf[4] << 8) | buf[5]);
ctx.bcst_trans = (byte)buf[6];
ctx.bcst_bpp = (byte)buf[7];
ctx.bcst_flags =
(uint)((buf[8] << 24) | (buf[9] << 16) |
(buf[10] << 8) | buf[11]);
if (sz > 14)
{
ctx.bcst_alpha = (byte)buf[12];
ctx.bcst_blend = (byte)buf[13];
ctx.bcst_orgx = (ushort)((buf[14] << 8) | buf[15]);
ctx.bcst_orgy = (ushort)((buf[16] << 8) | buf[17]);
ctx.bcst_minx = (ushort)((buf[18] << 8) | buf[19]);
ctx.bcst_miny = (ushort)((buf[20] << 8) | buf[21]);
ctx.bcst_maxx = (ushort)((buf[22] << 8) | buf[23]);
ctx.bcst_maxy = (ushort)((buf[24] << 8) | buf[25]);
}
else
{
ctx.bcst_alpha = 255;
ctx.bcst_blend = 0;
ctx.bcst_orgx = 0;
ctx.bcst_orgy = 0;
ctx.bcst_minx = 0;
ctx.bcst_miny = 0;
ctx.bcst_maxx = 0;
ctx.bcst_maxy = 0;
}
ctx.jpg_clrtrans = ctx.bcst_trans;
if ((ctx.bcst_flags & PDJPG_BCSFL_RDCT) != 0)
ctx.jpg_rdct = true;
if ((ctx.bcst_flags & PDJPG_BCSFL_LAYER_HIDDEN) != 0)
ctx.layer_hidden = true;
if ((ctx.bcst_flags & PDJPG_BCSFL_MEGABLOCK) != 0)
ctx.megablock = true;
if ((ctx.bcst_flags & PDJPG_BCSFL_ALTVLC) != 0)
ctx.altvlc = true;
if ((ctx.bcst_flags & PDJPG_BCSFL_AUTODCT) != 0)
ctx.auto_dct = true;
// printf("PDJPG_MarkerAPP12: BCST %04X %02X %02X %08X\n",
// ctx.bcst_version, ctx.bcst_trans,
// ctx.bcst_bpp, ctx.bcst_flags);
return (1);
}
if (!buf.memcmp("DRCT", 4))
{
if (ctx.huff == null)
ctx.huff = new BTJRange(ctx);
i = ctx.huff.MarkerDHT(ctx, ob);
return i;
}
return (0);
}