25 		   the "Song Position Pointer", but this is used by Line 6  in midibuf_message_length()
37 static int midibuf_is_empty(struct midi_buffer *this)  in midibuf_is_empty()  argument
39 	return (this->pos_read == this->pos_write) && !this->full;  in midibuf_is_empty()
42 static int midibuf_is_full(struct midi_buffer *this)  in midibuf_is_full()  argument
44 	return this->full;  in midibuf_is_full()
47 void line6_midibuf_reset(struct midi_buffer *this)  in line6_midibuf_reset()  argument
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()
60 	this->size = size;  in line6_midibuf_init()
61 	this->split = split;  in line6_midibuf_init()
62 	line6_midibuf_reset(this);  in line6_midibuf_init()
66 int line6_midibuf_bytes_free(struct midi_buffer *this)  in line6_midibuf_bytes_free()  argument
69 	    midibuf_is_full(this) ?  in line6_midibuf_bytes_free()
71 	    (this->pos_read - this->pos_write + this->size - 1) % this->size +  in line6_midibuf_bytes_free()
75 int line6_midibuf_bytes_used(struct midi_buffer *this)  in line6_midibuf_bytes_used()  argument
78 	    midibuf_is_empty(this) ?  in line6_midibuf_bytes_used()
80 	    (this->pos_write - this->pos_read + this->size - 1) % this->size +  in line6_midibuf_bytes_used()
84 int line6_midibuf_write(struct midi_buffer *this, unsigned char *data,  in line6_midibuf_write()  argument
91 	if (midibuf_is_full(this) || (length <= 0))  in line6_midibuf_write()
100 	bytes_free = line6_midibuf_bytes_free(this);  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()
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()
127 int line6_midibuf_read(struct midi_buffer *this, unsigned char *data,  in line6_midibuf_read()  argument
141 	if (midibuf_is_empty(this))  in line6_midibuf_read()
144 	bytes_used = line6_midibuf_bytes_used(this);  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()
176 				if (this->buf[this->pos_read + i] & 0x80)  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()
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()
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()
232 int line6_midibuf_ignore(struct midi_buffer *this, int length)  in line6_midibuf_ignore()  argument
234 	int bytes_used = line6_midibuf_bytes_used(this);  in line6_midibuf_ignore()
239 	this->pos_read = (this->pos_read + length) % this->size;  in line6_midibuf_ignore()
240 	this->full = 0;  in line6_midibuf_ignore()
244 void line6_midibuf_destroy(struct midi_buffer *this)  in line6_midibuf_destroy()  argument
246 	kfree(this->buf);  in line6_midibuf_destroy()
247 	this->buf = NULL;  in line6_midibuf_destroy()