summaryrefslogtreecommitdiffstats
path: root/apps/viewer.c
blob: f6538666263263724b945832fa2b05620e3fc7c9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
/***************************************************************************
 *
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2002 Gilles Roux
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>

#include "file.h"
#include "lcd.h"
#include "button.h"
#include "kernel.h"
#include "font.h"
#include "settings.h"
#include "icons.h"
#include "screens.h"
#include "status.h"


#define BUFFER_SIZE 1024

#define OUTSIDE_BUFFER -10
#define OUTSIDE_FILE   -11

static int fd;
static int file_size;

static char buffer[BUFFER_SIZE+1];
static int buffer_pos; /* Position of the buffer in the file */

static char display_lines; /* number of lines on the display */
static char display_columns; /* number of columns on the display */
static int begin_line; /* Index of the first line displayed on the lcd */
static int end_line;   /* Index of the last line displayed on the lcd */
static int begin_line_pos; /* Position of the first_line in the bufffer */
static int end_line_pos; /* Position of the last_line in the buffer */

/*
 * Known issue: The caching algorithm will fail (display incoherent data) if
 * the total space of the lines that are displayed on the screen exceeds the
 * buffer size (only happens with very long lines).
 */

static void display_line_count(void)
{
#ifdef HAVE_LCD_BITMAP
    int w,h;
    lcd_getstringsize("M", &w, &h);
    display_lines = LCD_HEIGHT / h;
    display_columns = LCD_WIDTH / w;
#else
    display_lines = 2;
    display_columns = 11;
#endif
}

static int find_next_line(int pos)
{
    int i;

    if (pos==OUTSIDE_BUFFER || pos==OUTSIDE_FILE)
        return pos;

    i = pos;
    if (buffer_pos+i>=file_size) {
        return OUTSIDE_FILE;
    }
    while (1) {
        i++;
        if (buffer_pos+i==file_size) {
            return i;
        }
        if (i>=BUFFER_SIZE) {
            return OUTSIDE_BUFFER;
        }
        if (buffer[i]==0) {
            return i;
        }
    }
}

static int find_prev_line(int pos)
{
    int i;

    if (pos==OUTSIDE_BUFFER || pos==OUTSIDE_FILE)
        return pos;

    i = pos;
    if (buffer_pos+i<0) {
        return OUTSIDE_FILE;
    }
    while (1) {
        i--;
        if (buffer_pos+i<0) {
            return i;
        }
        if (i<0) {
            return OUTSIDE_BUFFER;
        }
        if (buffer[i]==0) {
            return i;
        }
    }
}

static void viewer_draw(int col)
{
    int i, j;
    char* str;
    int line_pos;

    lcd_clear_display();

    line_pos = begin_line_pos;

    for (i=0; i <= end_line - begin_line; i++) {
        if (line_pos == OUTSIDE_BUFFER ||
            line_pos == OUTSIDE_FILE)
            break;
        str = buffer + line_pos + 1;
        for (j=0; j<col && *str!=0; ++j)
            str++;
        lcd_puts(0, i, str);
        line_pos = find_next_line(line_pos);
    }

    lcd_update();
}

static void fill_buffer(int pos)
{
    int i;
    int numread;

    if (pos>=file_size-BUFFER_SIZE)
        pos = file_size-BUFFER_SIZE;
    if (pos<0)
        pos = 0;

    lseek(fd, pos, SEEK_SET);
    numread = read(fd, buffer, BUFFER_SIZE);

    begin_line_pos -= pos - buffer_pos;
    end_line_pos -= pos - buffer_pos;
    buffer_pos = pos;

    buffer[numread] = 0;
    for(i=0;i<numread;i++) {
        switch(buffer[i]) {
            case '\r':
                buffer[i] = ' ';
                break;
            case '\n':
                buffer[i] = 0;
                break;
            default:
                break;
        }
    }
}

static bool viewer_init(char* file)
{
    int i;
    int ret;

    fd = open(file, O_RDONLY);
    if (fd==-1)
        return false;

    file_size = lseek(fd, 0, SEEK_END);

    buffer_pos = 0;
    begin_line = 0;
    begin_line_pos = -1;
    end_line = -1;
    end_line_pos = -1;
    fill_buffer(0);
    display_line_count();
    for (i=0; i<display_lines; ++i) {
        ret = find_next_line(end_line_pos);
        if (ret!=OUTSIDE_FILE && ret!=OUTSIDE_BUFFER) {
            end_line_pos = ret;
            end_line++;
        }
    }

    return true;
}

static void viewer_exit(void)
{
    close(fd);
}

static void viewer_scroll_down(void)
{
    int ret;

    ret = find_next_line(end_line_pos);
    switch ( ret ) {
        case OUTSIDE_BUFFER:
            begin_line_pos = find_next_line(begin_line_pos);
            fill_buffer(begin_line_pos+buffer_pos);
            end_line_pos = find_next_line(end_line_pos);
            break;

        case OUTSIDE_FILE:
            return;

        default:
            begin_line_pos = find_next_line(begin_line_pos);
            end_line_pos = ret;
            break;
    }
    begin_line++;
    end_line++;
}

static void viewer_scroll_up(void)
{
    int ret;

    ret = find_prev_line(begin_line_pos);
    switch ( ret ) {
        case OUTSIDE_BUFFER:
            end_line_pos = find_prev_line(end_line_pos);
            fill_buffer(buffer_pos+end_line_pos-BUFFER_SIZE);
            begin_line_pos = find_prev_line(begin_line_pos);
            break;

        case OUTSIDE_FILE:
            return;

        default:
            end_line_pos = find_prev_line(end_line_pos);
            begin_line_pos = ret;
            break;
    }
    begin_line--;
    end_line--;
}

static int pagescroll(int col)
{
    bool exit = false;
    int i;

    while (!exit) {
        switch (button_get(true)) {
#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_ON | BUTTON_UP:
            case BUTTON_ON | BUTTON_UP | BUTTON_REPEAT:
#else
            case BUTTON_ON | BUTTON_LEFT:
            case BUTTON_ON | BUTTON_LEFT | BUTTON_REPEAT:
#endif
                for (i=0; i<display_lines; i++)
                    viewer_scroll_up();
                break;

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_ON | BUTTON_DOWN:
            case BUTTON_ON | BUTTON_DOWN | BUTTON_REPEAT:
#else
            case BUTTON_ON | BUTTON_RIGHT:
            case BUTTON_ON | BUTTON_RIGHT | BUTTON_REPEAT:
#endif
                for (i=0; i<display_lines; i++)
                    viewer_scroll_down();
                break;
                            
#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_ON | BUTTON_LEFT:
            case BUTTON_ON | BUTTON_LEFT | BUTTON_REPEAT:
#else
            case BUTTON_ON | BUTTON_MENU | BUTTON_LEFT:
            case BUTTON_ON | BUTTON_MENU | BUTTON_LEFT | BUTTON_REPEAT:
#endif
                col -= display_columns;
                if (col < 0)
                    col = 0;
                break;

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_ON | BUTTON_RIGHT:
            case BUTTON_ON | BUTTON_RIGHT | BUTTON_REPEAT:
#else
            case BUTTON_ON | BUTTON_MENU | BUTTON_RIGHT:
            case BUTTON_ON | BUTTON_MENU | BUTTON_RIGHT | BUTTON_REPEAT:
#endif
                col += display_columns;
                break;

            case BUTTON_ON | BUTTON_REL: 
#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_ON | BUTTON_DOWN | BUTTON_REL:
            case BUTTON_ON | BUTTON_UP | BUTTON_REL:
#else
            case BUTTON_ON | BUTTON_RIGHT | BUTTON_REL:
            case BUTTON_ON | BUTTON_LEFT | BUTTON_REL:
            case BUTTON_ON | BUTTON_MENU | BUTTON_RIGHT | BUTTON_REL:
            case BUTTON_ON | BUTTON_MENU | BUTTON_LEFT | BUTTON_REL:
#endif
                exit = true;
                break;
        }
        if ( !exit )
            viewer_draw(col);
    }

    return col;
}
bool viewer_run(char* file)
{
    bool exit=false;
    int button;
    int col = 0;
    int ok;

#ifdef HAVE_LCD_BITMAP
    /* no margins */
    lcd_setmargins(0, 0);
#endif

    ok = viewer_init(file);
    if (!ok) {
        lcd_clear_display();
        lcd_puts(0, 0, "Error");
        lcd_update();
        sleep(HZ);
        viewer_exit();
        return false;
    }

    viewer_draw(col);
    while (!exit) {
        button = button_get(true);

        switch ( button ) {

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_F1:
            case BUTTON_OFF:
#else
            case BUTTON_STOP:
#endif
                viewer_exit();
                exit = true;
                break;

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_UP:
            case BUTTON_UP | BUTTON_REPEAT:
#else
            case BUTTON_LEFT:
            case BUTTON_LEFT | BUTTON_REPEAT:
#endif
                viewer_scroll_up();
                viewer_draw(col);
                break;

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_DOWN:
            case BUTTON_DOWN | BUTTON_REPEAT:
#else
            case BUTTON_RIGHT:
            case BUTTON_RIGHT | BUTTON_REPEAT:
#endif
                viewer_scroll_down();
                viewer_draw(col);
                break;

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_LEFT:
            case BUTTON_LEFT | BUTTON_REPEAT:
#else
            case BUTTON_MENU | BUTTON_LEFT:
            case BUTTON_MENU | BUTTON_LEFT | BUTTON_REPEAT:
#endif
                col--;
                if (col < 0)
                    col = 0;
                viewer_draw(col);
                break;

#ifdef HAVE_RECORDER_KEYPAD
            case BUTTON_RIGHT:
            case BUTTON_RIGHT | BUTTON_REPEAT:
#else
            case BUTTON_MENU | BUTTON_RIGHT:
            case BUTTON_MENU | BUTTON_RIGHT | BUTTON_REPEAT:
#endif
                col++;
                viewer_draw(col);
                break;

            case BUTTON_ON:
#ifdef HAVE_PLAYER_KEYPAD
            case BUTTON_ON | BUTTON_MENU:
#endif
                col = pagescroll(col);
                break;

            case SYS_USB_CONNECTED:
                usb_screen();
#ifdef HAVE_LCD_CHARCELLS
                status_set_param(false);
#endif
                viewer_exit();
                return true;
        }
    }
    return false;
}