Interpreting .cue file command PREGAP

cdrskin/cdrskin.1

@@ -2,7 +2,7 @@
 .\" First parameter, NAME, should be all caps
 .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
 .\" other parameters are allowed: see man(7), man(1)
-.TH CDRSKIN 1 "Jan 08, 2012"
+.TH CDRSKIN 1 "Jan 11, 2012"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -508,7 +508,7 @@ To enable CD-TEXT from the cue sheet file, cdrskin option -text has to be
 present.
 .br
 cdrskin currently supports TRACK datatypes AUDIO and MODE1/2048 which may
-not be mixed. It ignores commands POSTGAP and PREGAP.
+not be mixed. It ignores command POSTGAP.
 Data source may be of FILE type BINARY, MOTOROLA, or WAVE.
 .br
 Non-CDRWIN commands ARRANGER, COMPOSER, MESSAGE are supported.
@@ -987,7 +987,7 @@ taken as plain block number with block size 2048 byte.
 .BI cd_start_tno= number
 Set the number which shall be written as CD track number with the first
 track of the session. The following tracks will then get written with
-consequtive CD track numbers. The resulting number of the last track
+consecutive CD track numbers. The resulting number of the last track
 must not exceed 99. The lowest possible start number is 1, which is also
 the default.
 .br

cdrskin/cdrskin_timestamp.h

@@ -1 +1 @@
-#define Cdrskin_timestamP "2012.01.11.122013"
+#define Cdrskin_timestamP "2012.01.11.122158"

doc/cdtext.txt

@@ -684,7 +684,7 @@ TITLE "Joyful Nights"
 
 Several restrictions apply in the libburn call burn_session_by_cue_file():
 
-Commands POSTGAP, PREGAP are ignored.
+Command POSTGAP gets ignored.
 Only FILE types BINARY, MOTOROLA, WAVE are allowed.
 Only TRACK datatypes AUDIO, MODE1/2048 are allowed. They may not be mixed in
 the same session.

libburn/structure.c

@@ -1420,13 +1420,55 @@ ex:;
 }
 
 
+static int cue_read_timepoint_lba(char *apt, char *purpose, int *file_ba,
+								int flag)
+{
+	int ret, minute, second, frame;
+	char *msg = NULL, msf[3], *msf_pt;
+
+	BURN_ALLOC_MEM(msg, char, 4096);
+	if (strlen(apt) < 8) {
+no_time_point:;
+		sprintf(msg,
+			"Inappropriate cue sheet file %s '%.4000s'",
+			purpose, apt);
+		libdax_msgs_submit(libdax_messenger, -1, 0x00020194,
+			LIBDAX_MSGS_SEV_FAILURE, LIBDAX_MSGS_PRIO_HIGH,
+			burn_printify(msg), 0, 0);
+		ret = 0; goto ex;
+	}
+	if (apt[2] != ':' || apt[5] != ':' ||
+				(apt[8] != 0 && apt[8] != 32 && apt[8] != 9))
+		goto no_time_point;
+	msf[2] = 0;
+	msf_pt = msf;
+	strncpy(msf, apt, 2);
+	ret = cue_read_number(&msf_pt, &minute, 1);
+	if (ret <= 0)
+		goto ex;
+	strncpy(msf, apt + 3, 2);
+	ret = cue_read_number(&msf_pt, &second, 1);
+	if (ret <= 0)
+		goto ex;
+	strncpy(msf, apt + 6, 2);
+	ret = cue_read_number(&msf_pt, &frame, 1);
+	if (ret <= 0)
+		goto ex;
+
+	*file_ba = ((minute * 60) + second ) * 75 + frame;
+	ret = 1;
+ex:;
+	BURN_FREE_MEM(msg);
+	return ret;
+}
+
 static int cue_interpret_line(struct burn_session *session, char *line,
 				struct burn_cue_file_cursor *crs, int flag)
 {
-	int ret, mode, index_no, minute, second, frame, file_ba, chunks;
+	int ret, mode, index_no, file_ba, chunks;
 	int block_size, step, audio_xtr = 0;
 	off_t size;
-	char *cmd, *apt, *msg = NULL, msf[3], *msf_pt, *cpt, *filetype;
+	char *cmd, *apt, *msg = NULL, *cpt, *filetype;
 	struct burn_source *src, *inp_src;
 	enum burn_source_status source_status;
 	struct stat stbuf;
@@ -1610,37 +1652,10 @@ bad_flags:;
 		ret = cue_read_number(&apt, &index_no, 0);
 		if (ret <= 0)
 			goto ex;
-
-		/* Obtain time point */
-		if (strlen(apt) < 8) {
-no_time_point:;
-			sprintf(msg,
-		     "Inappropriate cue sheet file index time point '%.4000s'",
-				apt);
-			libdax_msgs_submit(libdax_messenger, -1, 0x00020194,
-				LIBDAX_MSGS_SEV_FAILURE, LIBDAX_MSGS_PRIO_HIGH,
-				burn_printify(msg), 0, 0);
-			ret = 0; goto ex;
-		}
-		if (apt[2] != ':' || apt[5] != ':' ||
-				(apt[8] != 0 && apt[8] != 32 && apt[8] != 9))
-			goto no_time_point;
-		msf[2] = 0;
-		msf_pt = msf;
-		strncpy(msf, apt, 2);
-		ret = cue_read_number(&msf_pt, &minute, 1);
-		if (ret <= 0)
-			goto ex;
-		strncpy(msf, apt + 3, 2);
-		ret = cue_read_number(&msf_pt, &second, 1);
-		if (ret <= 0)
-			goto ex;
-		strncpy(msf, apt + 6, 2);
-		ret = cue_read_number(&msf_pt, &frame, 1);
+		ret = cue_read_timepoint_lba(apt, "index time point",
+					 &file_ba, 0);
 		if (ret <= 0)
 			goto ex;
-
-		file_ba = ((minute * 60) + second ) * 75 + frame;
 		if (file_ba < crs->prev_file_ba) {
 overlapping_ba:;
 			libdax_msgs_submit(libdax_messenger, -1, 0x00020192,
@@ -1753,13 +1768,20 @@ overlapping_ba:;
 			0, 0);
 
 	} else if (strcmp(cmd, "PREGAP") == 0) {
-
-		/* >>> ??? implement ? */;
-
-		libdax_msgs_submit(libdax_messenger, -1, 0x00020195,
-			LIBDAX_MSGS_SEV_WARNING, LIBDAX_MSGS_PRIO_HIGH,
-			"In cue sheet file: PREGAP command not supported",
-			0, 0);
+		if (crs->track == NULL) {
+			libdax_msgs_submit(libdax_messenger, -1, 0x00020192,
+				LIBDAX_MSGS_SEV_FAILURE, LIBDAX_MSGS_PRIO_HIGH,
+				"In cue sheet file: INDEX found before TRACK",
+				0, 0);
+			ret = 0; goto ex;
+		}
+		ret = cue_read_timepoint_lba(apt, "pre-gap duration",
+					 	&file_ba, 0);
+		if (ret <= 0)
+			goto ex;
+		ret = burn_track_set_pregap_size(crs->track, file_ba, 0);
+		if (ret <= 0)
+			goto ex;
 
 	} else if (strcmp(cmd, "REM") == 0) {
 		;