shithub: cuefs

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Fix crash when reading small portions of wave headers

--- a/BUGS

+++ b/BUGS

@@ -3,7 +3,12 @@

 • everything will get resampled to 44100Hz/16bit/2channel

 • the codebase is a mess

 • reading concurrently from the same fid might break decoding logic, or be unecessarily slow (does that ever happen?)

-• zuke causes wavserve to do a negative readdec() somehow

+• zuke with wav keeps requesting the file header at offsets 0, 4 and 8; never starts playing

 • some parser/cuefs behavior might be non-standard or undesirable

 	- for example, there's currently no way to split tracks without including the pregap either at the end of the last track or beggining of current one

 • parser is incomplete

+• splitting tracks from → to the same format could some times be done more efficiently, skipping the decode (and resample) → encode process; this could be especially beneficial to lossy formats since there would be no reencoding.

+• some cuesheets have metadata (that would otherwise have nowhere to be in the sheet) stored in comments, in a somewhat semistandard manner, i.e.

+		REM GENRE "Progressive Rock"

+		REM DATE 2002

+	it probably wouldn't hurt to try parsing some of those; not a high priority at the moment

--- a/fs.c

+++ b/fs.c

@@ -284,7 +284,7 @@

 {

 	Wavehdr hdr;

 	Decoder *dec;

-	ulong offset, count, hcount;

+	long offset, count, hcount;

 	offset = r->ifcall.offset;

 	count = r->ifcall.count;

@@ -291,16 +291,25 @@

 	hcount = 0;

+	debug("wavserve: count = %ld, offset = %ld, r->ofcall.count = %ld", 

+		count, offset, r->ofcall.count);

+

 	/* 44 == start of pcm data */

 	if(offset < 44)

 	{

 		hcount = 44 - offset;

+		if(count < hcount)

+			hcount = count;

 		count -= hcount;

-		offset = 0;

-		fillwavehdr(&hdr, 2, 44100, 16, count);

-		memcpy(r->ofcall.data, &hdr, hcount);

+		fillwavehdr(&hdr, 2, 44100, 16, entrylen(e));

+		memcpy(r->ofcall.data, &hdr+offset, hcount);

+		r->ofcall.count += hcount;

+		offset = 44;

 	}

+	debug("; after header: count = %ld, hcount = %ld, offset = %ld, r->ofcall.count = %ld\n",

+		count, hcount, offset, r->ofcall.count);

+

 	if(count == 0)

 	{

 		respond(r, nil);

@@ -308,7 +317,7 @@

 	}

 	dec = reqdec(e, r, offset);

-	r->ofcall.count = readdec(dec, r->ofcall.data+hcount, count);

+	r->ofcall.count += readdec(dec, r->ofcall.data+hcount, count);

 	respond(r, nil);

 }