From 6dd4c500fb52f73d280ecff0da5dedd8931bb7d0 Mon Sep 17 00:00:00 2001
From: thor <thor@35dc7657-300d-0410-a2e5-dc2837fedb53>
Date: Sun, 4 Feb 2018 11:42:14 +0000
Subject: [PATCH] libmpg123: add MPG123_FREEFORMAT_SIZE and MPG123_NO_READAHEAD

git-svn-id: svn://scm.orgis.org/mpg123/trunk@4394 35dc7657-300d-0410-a2e5-dc2837fedb53
---
 NEWS.libmpg123            |  1 +
 src/libmpg123/frame.c     |  3 ++-
 src/libmpg123/frame.h     |  1 +
 src/libmpg123/libmpg123.c |  6 ++++++
 src/libmpg123/parse.c     | 10 +++++++++-
 5 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/NEWS.libmpg123 b/NEWS.libmpg123
index 20c1ab5b..3f7b6aee 100644
--- a/NEWS.libmpg123
+++ b/NEWS.libmpg123
@@ -12,6 +12,7 @@ Changes in libmpg123 libtool interface versions...
 	- added MPG123_STORE_RAW_ID3 and mpg123_id3_raw()
 	- added mpg123_new_string() and mpg123_delete_string()
 	- added MPG123_FORCE_ENDIAN and MPG123_BIG_ENDIAN
+	- added MPG123_NO_READAHEAD and MPG123_FREEFORMAT_SIZE
 
 44.0.44
 	- added mpg123_getformat2()
diff --git a/src/libmpg123/frame.c b/src/libmpg123/frame.c
index 70867430..8c137c95 100644
--- a/src/libmpg123/frame.c
+++ b/src/libmpg123/frame.c
@@ -64,6 +64,7 @@ static void frame_default_pars(mpg123_pars *mp)
 	mp->feedpool = 5; 
 	mp->feedbuffer = 4096;
 #endif
+	mp->freeformat_framesize = -1;
 }
 
 void frame_init(mpg123_handle *fr)
@@ -564,7 +565,7 @@ static void frame_fixed_reset(mpg123_handle *fr)
 #endif
 	fr->halfphase = 0; /* here or indeed only on first-time init? */
 	fr->error_protection = 0;
-	fr->freeformat_framesize = -1;
+	fr->freeformat_framesize = fr->p.freeformat_framesize;
 	fr->enc_delay = -1;
 	fr->enc_padding = -1;
 	memset(fr->id3buf, 0, sizeof(fr->id3buf));
diff --git a/src/libmpg123/frame.h b/src/libmpg123/frame.h
index 047d3f1e..f1648217 100644
--- a/src/libmpg123/frame.h
+++ b/src/libmpg123/frame.h
@@ -84,6 +84,7 @@ struct mpg123_pars_struct
 	long feedpool;
 	long feedbuffer;
 #endif
+	long freeformat_framesize;
 };
 
 enum frame_state_flags
diff --git a/src/libmpg123/libmpg123.c b/src/libmpg123/libmpg123.c
index 9ddd2cd5..2ca924f2 100644
--- a/src/libmpg123/libmpg123.c
+++ b/src/libmpg123/libmpg123.c
@@ -255,6 +255,9 @@ int attribute_align_arg mpg123_par(mpg123_pars *mp, enum mpg123_parms key, long
 			ret = MPG123_MISSING_FEATURE;
 #endif
 		break;
+		case MPG123_FREEFORMAT_SIZE:
+			mp->freeformat_framesize = val;
+		break; 
 		default:
 			ret = MPG123_BAD_PARAM;
 	}
@@ -344,6 +347,9 @@ int attribute_align_arg mpg123_getpar(mpg123_pars *mp, enum mpg123_parms key, lo
 			ret = MPG123_MISSING_FEATURE;
 #endif
 		break;
+		case MPG123_FREEFORMAT_SIZE:
+			*val = mp->freeformat_framesize;
+		break; 
 		default:
 			ret = MPG123_BAD_PARAM;
 	}
diff --git a/src/libmpg123/parse.c b/src/libmpg123/parse.c
index 8f3db04d..e56f1706 100644
--- a/src/libmpg123/parse.c
+++ b/src/libmpg123/parse.c
@@ -543,7 +543,9 @@ init_resync:
 
 	if(!fr->firsthead)
 	{
-		ret = do_readahead(fr, newhead);
+		ret = fr->p.flags & MPG123_NO_READAHEAD
+		?	PARSE_GOOD
+		:	do_readahead(fr, newhead);
 		/* readahead can fail mit NEED_MORE, in which case we must also make the just read header available again for next go */
 		if(ret < 0) fr->rd->back_bytes(fr, 4);
 		JUMP_CONCLUSION(ret);
@@ -787,6 +789,12 @@ static int decode_header(mpg123_handle *fr,unsigned long newhead, int *freeforma
 		if(fr->freeformat_framesize < 0)
 		{
 			int ret;
+			if(fr->p.flags & MPG123_NO_READAHEAD)
+			{
+				if(VERBOSE3)
+					error("Got no free-format frame size and am not allowed to read ahead.");
+				return PARSE_BAD;
+			}
 			*freeformat_count += 1;
 			if(*freeformat_count > 5)
 			{