1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2004-2010 Markus Grabner (line6@grabner-graz.at)
18 		message_length = -1;  in midibuf_message_length()
22 		message_length = length[(code >> 4) - 8];  in midibuf_message_length()
24 		static const int length[] = { -1, 2, 2, 2, -1, -1, 1, 1, 1, -1,  in midibuf_message_length()
25 			1, 1, 1, -1, 1, 1  in midibuf_message_length()
35 	return (this->pos_read == this->pos_write) && !this->full;  in midibuf_is_empty()
40 	return this->full;  in midibuf_is_full()
45 	this->pos_read = this->pos_write = this->full = 0;  in line6_midibuf_reset()
46 	this->command_prev = -1;  in line6_midibuf_reset()
49 int line6_midibuf_init(struct midi_buffer *this, int size, int split)  in line6_midibuf_init()  argument
51 	this->buf = kmalloc(size, GFP_KERNEL);  in line6_midibuf_init()
53 	if (this->buf == NULL)  in line6_midibuf_init()
54 		return -ENOMEM;  in line6_midibuf_init()
56 	this->size = size;  in line6_midibuf_init()
57 	this->split = split;  in line6_midibuf_init()
67 	    (this->pos_read - this->pos_write + this->size - 1) % this->size +  in line6_midibuf_bytes_free()
76 	    (this->pos_write - this->pos_read + this->size - 1) % this->size +  in line6_midibuf_bytes_used()
91 	if (data[length - 1] == 0xfe) {  in line6_midibuf_write()
92 		--length;  in line6_midibuf_write()
102 		length1 = this->size - this->pos_write;  in line6_midibuf_write()
106 			memcpy(this->buf + this->pos_write, data, length);  in line6_midibuf_write()
107 			this->pos_write += length;  in line6_midibuf_write()
110 			length2 = length - length1;  in line6_midibuf_write()
111 			memcpy(this->buf + this->pos_write, data, length1);  in line6_midibuf_write()
112 			memcpy(this->buf, data + length1, length2);  in line6_midibuf_write()
113 			this->pos_write = length2;  in line6_midibuf_write()
116 		if (this->pos_write == this->pos_read)  in line6_midibuf_write()
117 			this->full = 1;  in line6_midibuf_write()
135 		return -EINVAL;  in line6_midibuf_read()
145 	length1 = this->size - this->pos_read;  in line6_midibuf_read()
147 	command = this->buf[this->pos_read];  in line6_midibuf_read()
157 			this->buf[this->pos_read] = fixed;  in line6_midibuf_read()
165 		this->command_prev = command;  in line6_midibuf_read()
167 		if (this->command_prev > 0) {  in line6_midibuf_read()
169 			    midibuf_message_length(this->command_prev);  in line6_midibuf_read()
172 				midi_length = midi_length_prev - 1;  in line6_midibuf_read()
175 				midi_length = -1;  in line6_midibuf_read()
177 			midi_length = -1;  in line6_midibuf_read()
185 				if (this->buf[this->pos_read + i] & 0x80)  in line6_midibuf_read()
191 			length2 = length - length1;  in line6_midibuf_read()
194 				if (this->buf[this->pos_read + i] & 0x80)  in line6_midibuf_read()
201 					if (this->buf[i] & 0x80)  in line6_midibuf_read()
209 			midi_length = -1;	/* end of message not found */  in line6_midibuf_read()
213 		if (!this->split)  in line6_midibuf_read()
224 		memcpy(data + repeat, this->buf + this->pos_read, length);  in line6_midibuf_read()
225 		this->pos_read += length;  in line6_midibuf_read()
228 		length2 = length - length1;  in line6_midibuf_read()
229 		memcpy(data + repeat, this->buf + this->pos_read, length1);  in line6_midibuf_read()
230 		memcpy(data + repeat + length1, this->buf, length2);  in line6_midibuf_read()
231 		this->pos_read = length2;  in line6_midibuf_read()
235 		data[0] = this->command_prev;  in line6_midibuf_read()
237 	this->full = 0;  in line6_midibuf_read()
248 	this->pos_read = (this->pos_read + length) % this->size;  in line6_midibuf_ignore()
249 	this->full = 0;  in line6_midibuf_ignore()
255 	kfree(this->buf);  in line6_midibuf_destroy()
256 	this->buf = NULL;  in line6_midibuf_destroy()