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seq_midi_event: fix parsing of missing data bytes

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Reorganize the encoder logic to prevent status bytes that appear where
data bytes are expected from being interpreted as data bytes.
This commit is contained in:
Clemens Ladisch 2007-08-10 09:40:29 +02:00
parent 4ebeecda28
commit 5090cf3520
1 changed files with 41 additions and 39 deletions
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38
src/seq/seq_midi_event.c
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@ -93,22 +93,22 @@ static struct status_event_list_t {
{SND_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode}, {SND_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode},
{SND_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode}, {SND_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode},
/* invalid */ /* invalid */
{SND_SEQ_EVENT_NONE, 0, NULL, NULL}, {SND_SEQ_EVENT_NONE, -1, NULL, NULL},
/* 0xf0 - 0xff */ /* 0xf0 - 0xff */
{SND_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */ {SND_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */
{SND_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */ {SND_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */
{SND_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */ {SND_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */
{SND_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */ {SND_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */
{SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf4 */ {SND_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf4 */
{SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf5 */ {SND_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf5 */
{SND_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */ {SND_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
{SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf7 */ {SND_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf7 */
{SND_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */ {SND_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
{SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf9 */ {SND_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf9 */
{SND_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */ {SND_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */
{SND_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */ {SND_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */
{SND_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */ {SND_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */
{SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xfd */ {SND_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xfd */
{SND_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */ {SND_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
{SND_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */ {SND_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
}; };
@ -311,25 +311,27 @@ int snd_midi_event_encode_byte(snd_midi_event_t *dev, int c, snd_seq_event_t *ev
return 1; return 1;
} }
if ((c & 0x80) &&
(c != MIDI_CMD_COMMON_SYSEX_END || dev->type != ST_SYSEX)) {
/* new command */
dev->buf[0] = c;
if ((c & 0xf0) == 0xf0) /* system message */
dev->type = (c & 0x0f) + ST_SPECIAL;
else
dev->type = (c >> 4) & 0x07;
dev->read = 1;
dev->qlen = status_event[dev->type].qlen;
} else {
if (dev->qlen > 0) { if (dev->qlen > 0) {
/* rest of command */ /* rest of command */
dev->buf[dev->read++] = c; dev->buf[dev->read++] = c;
if (dev->type != ST_SYSEX) if (dev->type != ST_SYSEX)
dev->qlen--; dev->qlen--;
} else { } else {
/* new command */ /* running status */
dev->read = 1; dev->buf[1] = c;
if (c & 0x80) {
dev->buf[0] = c;
if ((c & 0xf0) == 0xf0) /* special events */
dev->type = (c & 0x0f) + ST_SPECIAL;
else
dev->type = (c >> 4) & 0x07;
dev->qlen = status_event[dev->type].qlen;
} else {
/* process this byte as argument */
dev->buf[dev->read++] = c;
dev->qlen = status_event[dev->type].qlen - 1; dev->qlen = status_event[dev->type].qlen - 1;
dev->read = 2;
} }
} }
if (dev->qlen == 0) { if (dev->qlen == 0) {