1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
17 		message_length = -1;  in midibuf_message_length()
21 		message_length = length[(code >> 4) - 8];  in midibuf_message_length()
28 		static const int length[] = { -1, 2, -1, 2, -1, -1, 1, 1, 1, 1,  in midibuf_message_length()
29 			1, 1, 1, -1, 1, 1  in midibuf_message_length()
39 	return (this->pos_read == this->pos_write) && !this->full;  in midibuf_is_empty()
44 	return this->full;  in midibuf_is_full()
49 	this->pos_read = this->pos_write = this->full = 0;  in line6_midibuf_reset()
50 	this->command_prev = -1;  in line6_midibuf_reset()
53 int line6_midibuf_init(struct midi_buffer *this, int size, int split)  in line6_midibuf_init()  argument
55 	this->buf = kmalloc(size, GFP_KERNEL);  in line6_midibuf_init()
57 	if (this->buf == NULL)  in line6_midibuf_init()
58 		return -ENOMEM;  in line6_midibuf_init()
60 	this->size = size;  in line6_midibuf_init()
61 	this->split = split;  in line6_midibuf_init()
71 	    (this->pos_read - this->pos_write + this->size - 1) % this->size +  in line6_midibuf_bytes_free()
80 	    (this->pos_write - this->pos_read + this->size - 1) % this->size +  in line6_midibuf_bytes_used()
95 	if (data[length - 1] == 0xfe) {  in line6_midibuf_write()
96 		--length;  in line6_midibuf_write()
106 		length1 = this->size - this->pos_write;  in line6_midibuf_write()
110 			memcpy(this->buf + this->pos_write, data, length);  in line6_midibuf_write()
111 			this->pos_write += length;  in line6_midibuf_write()
114 			length2 = length - length1;  in line6_midibuf_write()
115 			memcpy(this->buf + this->pos_write, data, length1);  in line6_midibuf_write()
116 			memcpy(this->buf, data + length1, length2);  in line6_midibuf_write()
117 			this->pos_write = length2;  in line6_midibuf_write()
120 		if (this->pos_write == this->pos_read)  in line6_midibuf_write()
121 			this->full = 1;  in line6_midibuf_write()
139 		return -EINVAL;  in line6_midibuf_read()
149 	length1 = this->size - this->pos_read;  in line6_midibuf_read()
152 	command = this->buf[this->pos_read];  in line6_midibuf_read()
156 		this->command_prev = command;  in line6_midibuf_read()
158 		if (this->command_prev > 0) {  in line6_midibuf_read()
160 			    midibuf_message_length(this->command_prev);  in line6_midibuf_read()
163 				midi_length = midi_length_prev - 1;  in line6_midibuf_read()
166 				midi_length = -1;  in line6_midibuf_read()
168 			midi_length = -1;  in line6_midibuf_read()
176 				if (this->buf[this->pos_read + i] & 0x80)  in line6_midibuf_read()
182 			length2 = length - length1;  in line6_midibuf_read()
185 				if (this->buf[this->pos_read + i] & 0x80)  in line6_midibuf_read()
192 					if (this->buf[i] & 0x80)  in line6_midibuf_read()
200 			midi_length = -1;	/* end of message not found */  in line6_midibuf_read()
204 		if (!this->split)  in line6_midibuf_read()
215 		memcpy(data + repeat, this->buf + this->pos_read, length);  in line6_midibuf_read()
216 		this->pos_read += length;  in line6_midibuf_read()
219 		length2 = length - length1;  in line6_midibuf_read()
220 		memcpy(data + repeat, this->buf + this->pos_read, length1);  in line6_midibuf_read()
221 		memcpy(data + repeat + length1, this->buf, length2);  in line6_midibuf_read()
222 		this->pos_read = length2;  in line6_midibuf_read()
226 		data[0] = this->command_prev;  in line6_midibuf_read()
228 	this->full = 0;  in line6_midibuf_read()
239 	this->pos_read = (this->pos_read + length) % this->size;  in line6_midibuf_ignore()
240 	this->full = 0;  in line6_midibuf_ignore()
246 	kfree(this->buf);  in line6_midibuf_destroy()
247 	this->buf = NULL;  in line6_midibuf_destroy()