apps/plugins/dict.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 Tomas Salfischberger
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19
  20 #include "plugin.h"
  21
  22 PLUGIN_HEADER
  23
  24 /* save the plugin api pointer. */
  25 static struct plugin_api* rb;
  26 /* screen info */
  27 static int display_columns, display_lines;
  28
  29 /* Some lenghts */
  30 #define WORDLEN 32 /* has to be the same in rdf2binary.c */
  31
  32 /* Struct packing */
  33 #ifdef __GNUC__
  34 #define STRUCT_PACKED __attribute__((packed))
  35 #else
  36 #define STRUCT_PACKED
  37 #pragma pack (push, 2)
  38 #endif
  39
  40 /* The word struct :) */
  41 struct stWord
  42 {
  43     char word[WORDLEN];
  44     long offset;
  45 } STRUCT_PACKED;
  46
  47 /* A funtion to get width and height etc (from viewer.c) */
  48 void init_screen(void)
  49 {
  50 #ifdef HAVE_LCD_BITMAP
  51     int w,h;
  52
  53     rb->lcd_getstringsize("o", &w, &h);
  54     display_lines = LCD_HEIGHT / h;
  55     display_columns = LCD_WIDTH / w;
  56 #else
  57
  58     display_lines = 2;
  59     display_columns = 11;
  60 #endif
  61 }
  62
  63 /* global vars for pl_malloc() */
  64 void *bufptr;
  65 ssize_t bufleft;
  66
  67 /* simple function to "allocate" memory in pluginbuffer. */
  68 void *pl_malloc(ssize_t size)
  69 {
  70     void *ptr;
  71     ptr = bufptr;
  72
  73     if (bufleft < size)
  74     {
  75         return NULL;
  76     }
  77     else
  78     {
  79         bufptr += size;
  80         return ptr;
  81     }
  82 }
  83
  84 /* init function for pl_malloc() */
  85 void pl_malloc_init(void)
  86 {
  87     bufptr = rb->plugin_get_buffer((size_t *)&bufleft);
  88 }
  89
  90 /* for endian problems */
  91 #ifdef ROCKBOX_BIG_ENDIAN
  92 #define reverse(x) x
  93 #else
  94 long reverse (long N) {
  95     unsigned char B[4];
  96     B[0] = (N & 0x000000FF) >> 0;
  97     B[1] = (N & 0x0000FF00) >> 8;
  98     B[2] = (N & 0x00FF0000) >> 16;
  99     B[3] = (N & 0xFF000000) >> 24;
 100     return ((B[0] << 24) | (B[1] << 16) | (B[2] << 8) | (B[3] << 0));
 101 }
 102 #endif
 103
 104 /* Button definitions */
 105 #if CONFIG_KEYPAD == PLAYER_PAD
 106 #define LP_QUIT BUTTON_STOP
 107 #elif (CONFIG_KEYPAD == IPOD_4G_PAD) || \
 108       (CONFIG_KEYPAD == IPOD_3G_PAD) || \
 109       (CONFIG_KEYPAD == IPOD_1G2G_PAD)
 110 #define LP_QUIT BUTTON_MENU
 111 #elif CONFIG_KEYPAD == IRIVER_IFP7XX_PAD
 112 #define LP_QUIT BUTTON_PLAY
 113 #elif CONFIG_KEYPAD == IAUDIO_X5M5_PAD
 114 #define LP_QUIT BUTTON_POWER
 115 #elif CONFIG_KEYPAD == GIGABEAT_PAD
 116 #define LP_QUIT BUTTON_POWER
 117 #elif (CONFIG_KEYPAD == SANSA_E200_PAD) || \
 118 (CONFIG_KEYPAD == SANSA_C200_PAD)
 119 #define LP_QUIT BUTTON_POWER
 120 #elif CONFIG_KEYPAD == IRIVER_H10_PAD
 121 #define LP_QUIT BUTTON_POWER
 122 #elif CONFIG_KEYPAD == MROBE500_PAD
 123 #define LP_QUIT BUTTON_POWER
 124 #elif CONFIG_KEYPAD == GIGABEAT_S_PAD
 125 #define LP_QUIT BUTTON_BACK
 126 #else
 127 #define LP_QUIT BUTTON_OFF
 128 #endif
 129
 130 /* data files */
 131 #define DICT_INDEX ROCKBOX_DIR "/rocks/apps/dict.index"
 132 #define DICT_DESC ROCKBOX_DIR "/rocks/apps/dict.desc"
 133
 134 /* the main plugin function */
 135 enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
 136 {
 137     char searchword[WORDLEN]; /* word to search for */
 138     char *description; /* pointer to description buffer */
 139     char *output; /* pointer to output buffer */
 140     char *ptr, *space;
 141     struct stWord word; /* the struct to read into */
 142     int fIndex, fData; /* files */
 143     int filesize, high, low, probe;
 144     int lines, len, outputted, next;
 145
 146     /* plugin stuff */
 147     (void)parameter;
 148     rb = api;
 149
 150     /* get screen info */
 151     init_screen();
 152
 153     /* get pl_malloc() buffer ready. */
 154     pl_malloc_init();
 155
 156     /* init description buffer (size is because we don't have scrolling)*/
 157     description = (char *)pl_malloc(display_columns * display_lines);
 158     if (description == NULL)
 159     {
 160         DEBUGF("Err: failed to allocate description buffer.");
 161         return PLUGIN_ERROR;
 162     }
 163
 164     /* init output buffer */
 165     output = (char *)pl_malloc(display_columns);
 166     if (output == NULL)
 167     {
 168         DEBUGF("Err: failed to allocate output buffer.");
 169         return PLUGIN_ERROR;
 170     }
 171
 172     /* "clear" input buffer */
 173     searchword[0] = '\0';
 174
 175     rb->kbd_input(searchword, sizeof(searchword)); /* get the word to search */
 176
 177     fIndex = rb->open(DICT_INDEX, O_RDONLY); /* index file */
 178     if (fIndex < 0)
 179     {
 180         DEBUGF("Err: Failed to open index file.\n");
 181         rb->splash(HZ*2, "Failed to open index.");
 182         return PLUGIN_ERROR;
 183     }
 184
 185     filesize = rb->filesize(fIndex); /* get filesize */
 186
 187     DEBUGF("Filesize: %d bytes = %d words \n", filesize,
 188            (filesize / (int)sizeof(struct stWord)));
 189
 190     /* for the searching algorithm */
 191     high = filesize / sizeof( struct stWord );
 192     low = -1;
 193
 194     while (high - low > 1)
 195     {
 196         probe = (high + low) / 2;
 197
 198         /* Jump to word pointed by probe, and read it. */
 199         rb->lseek(fIndex, sizeof(struct stWord) * probe, SEEK_SET);
 200         rb->read(fIndex, &word, sizeof(struct stWord));
 201
 202         /* jump according to the found word. */
 203         if (rb->strcasecmp(searchword, word.word) < 0)
 204         {
 205             high = probe;
 206         }
 207         else
 208         {
 209             low = probe;
 210         }
 211     }
 212
 213     /* read in the word */
 214     rb->lseek(fIndex, sizeof(struct stWord) * low, SEEK_SET);
 215     rb->read(fIndex, &word, sizeof(struct stWord));
 216
 217     /* Check if we found something */
 218     if (low == -1 || rb->strcasecmp(searchword, word.word) != 0)
 219     {
 220         DEBUGF("Not found.\n");
 221         rb->splash(HZ*2, "Not found.");
 222         rb->close(fIndex);
 223         return PLUGIN_OK;
 224     }
 225
 226     DEBUGF("Found %s at offset %ld\n", word.word, reverse(word.offset));
 227
 228     /* now open the description file */
 229     fData = rb->open(DICT_DESC, O_RDONLY);
 230     if (fData < 0)
 231     {
 232         DEBUGF("Err: Failed to open description file.\n");
 233         rb->splash(HZ*2, "Failed to open descriptions.");
 234         rb->close(fIndex);
 235         return PLUGIN_ERROR;
 236     }
 237
 238     /* seek to the right offset */
 239     rb->lseek(fData, (off_t)reverse(word.offset), SEEK_SET);
 240
 241     /* Read in the description */
 242     rb->read_line(fData, description, display_columns * display_lines);
 243
 244     /* And print it to debug. */
 245     DEBUGF("Description: %s\n", description);
 246
 247     /* get pointer to first char */
 248     ptr = description;
 249
 250     lines = 0;
 251     outputted = 0;
 252     len = rb->strlen(description);
 253
 254     /* clear screen */
 255     rb->lcd_clear_display();
 256
 257     /* for large screens display the searched word. */
 258     if(display_lines > 4)
 259     {
 260         rb->lcd_puts(0, lines, searchword);
 261         lines++;
 262     }
 263
 264     /* TODO: Scroll, or just stop when there are to much lines. */
 265     while (1)
 266     {
 267         /* copy one lcd line */
 268         rb->strncpy(output, ptr, display_columns);
 269         output[display_columns] = '\0';
 270
 271         /* typecast to kill a warning... */
 272         if((int)rb->strlen(ptr) < display_columns)
 273         {
 274             rb->lcd_puts(0, lines, output);
 275             lines++;
 276             break;
 277         }
 278
 279
 280         /* get the last spacechar */
 281         space = rb->strrchr(output, ' ');
 282
 283         if (space != NULL)
 284         {
 285             *space = '\0';
 286             next = (space - (char*)output) + 1;
 287         }
 288         else
 289         {
 290             next = display_columns;
 291         }
 292
 293         /* put the line on screen */
 294         rb->lcd_puts(0, lines, output);
 295
 296         /* get output count */
 297         outputted += rb->strlen(output);
 298
 299         if (outputted < len)
 300         {
 301             /* set pointer to the next part */
 302             ptr += next;
 303             lines++;
 304         }
 305         else
 306         {
 307             break;
 308         }
 309     }
 310     rb->lcd_update();
 311
 312     /* wait for keypress */
 313     while(rb->button_get(true) != LP_QUIT)
 314     {
 315         /* do nothing */
 316         /* maybe define some keys for navigation here someday. */
 317     }
 318
 319     rb->close(fIndex);
 320     rb->close(fData);
 321     return PLUGIN_OK;
 322 }