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id3v2: add a note for possibly reading TOC in the future

--- a/id3v2.c

+++ b/id3v2.c

@@ -299,7 +299,7 @@

 	uint x;

 	int xversion, xlayer, xbitrate;

-	if(ctx->read(ctx, ctx->buf, 64) != 64)

+	if(ctx->read(ctx, ctx->buf, 256) != 256)

 		return;

 	x = beuint((uchar*)ctx->buf);

@@ -325,9 +325,14 @@

 				ctx->duration = n * samplespf * 1000 / ctx->samplerate;

 			}

-			if(ctx->duration == 0 && (x & 2) != 0 && framelen > 0){ /* file size is set */

-				n = beuint(b);

-				ctx->duration = n * samplespf * 1000 / framelen / ctx->samplerate;

+			if((x & 2) != 0){ /* file size is set */

+				n = beuint(b); b += 4;

+				if(ctx->duration == 0 && framelen > 0)

+					ctx->duration = n * samplespf * 1000 / framelen / ctx->samplerate;

+

+				if((x & 4) != 0){ /* TOC is set */

+					/* not doing anything yet */

+				}

 			}

 		}else if(memcmp(&ctx->buf[0x24], "VBRI", 4) == 0){

 			n = beuint((uchar*)&ctx->buf[0x32]);