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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Tomas Salfischberger
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#include "lib/simple_viewer.h"
PLUGIN_HEADER
#define MIN_DESC_BUF_SIZE 0x400 /* arbitrary minimum size for description */
/* Some lenghts */
#define WORDLEN 32 /* has to be the same in rdf2binary.c */
/* Struct packing */
#ifdef __GNUC__
#define STRUCT_PACKED __attribute__((packed))
#else
#define STRUCT_PACKED
#pragma pack (push, 2)
#endif
/* The word struct :) */
struct stWord
{
char word[WORDLEN];
long offset;
} STRUCT_PACKED;
/* for endian problems */
#ifdef ROCKBOX_BIG_ENDIAN
#define reverse(x) x
#else
long reverse (long N) {
unsigned char B[4];
B[0] = (N & 0x000000FF) >> 0;
B[1] = (N & 0x0000FF00) >> 8;
B[2] = (N & 0x00FF0000) >> 16;
B[3] = (N & 0xFF000000) >> 24;
return ((B[0] << 24) | (B[1] << 16) | (B[2] << 8) | (B[3] << 0));
}
#endif
/* data files */
#define DICT_INDEX PLUGIN_APPS_DIR "/dict.index"
#define DICT_DESC PLUGIN_APPS_DIR "/dict.desc"
/* the main plugin function */
enum plugin_status plugin_start(const void* parameter)
{
char searchword[WORDLEN]; /* word to search for */
char *description; /* pointer to description buffer */
struct stWord word; /* the struct to read into */
int fIndex, fData; /* files */
int filesize, high, low, probe;
char *buffer;
size_t buffer_size;
/* plugin stuff */
(void)parameter;
/* allocate buffer. */
buffer = rb->plugin_get_buffer(&buffer_size);
if (buffer == NULL || buffer_size < MIN_DESC_BUF_SIZE)
{
DEBUGF("Err: Failed to allocate buffer.\n");
rb->splash(HZ*2, "Failed to allocate buffer.");
return PLUGIN_ERROR;
}
description = buffer;
/* "clear" input buffer */
searchword[0] = '\0';
/* get the word to search */
if (rb->kbd_input(searchword, sizeof(searchword)) < 0)
return PLUGIN_OK; /* input cancelled */
fIndex = rb->open(DICT_INDEX, O_RDONLY); /* index file */
if (fIndex < 0)
{
DEBUGF("Err: Failed to open index file.\n");
rb->splash(HZ*2, "Failed to open index.");
return PLUGIN_ERROR;
}
filesize = rb->filesize(fIndex); /* get filesize */
DEBUGF("Filesize: %d bytes = %d words \n", filesize,
(filesize / (int)sizeof(struct stWord)));
/* for the searching algorithm */
high = filesize / sizeof( struct stWord );
low = -1;
while (high - low > 1)
{
probe = (high + low) / 2;
/* Jump to word pointed by probe, and read it. */
rb->lseek(fIndex, sizeof(struct stWord) * probe, SEEK_SET);
rb->read(fIndex, &word, sizeof(struct stWord));
/* jump according to the found word. */
if (rb->strcasecmp(searchword, word.word) < 0)
{
high = probe;
}
else
{
low = probe;
}
}
/* read in the word */
rb->lseek(fIndex, sizeof(struct stWord) * low, SEEK_SET);
rb->read(fIndex, &word, sizeof(struct stWord));
rb->close(fIndex);
/* Check if we found something */
if (low == -1 || rb->strcasecmp(searchword, word.word) != 0)
{
DEBUGF("Not found.\n");
rb->splash(HZ*2, "Not found.");
return PLUGIN_OK;
}
DEBUGF("Found %s at offset %ld\n", word.word, reverse(word.offset));
/* now open the description file */
fData = rb->open(DICT_DESC, O_RDONLY);
if (fData < 0)
{
DEBUGF("Err: Failed to open description file.\n");
rb->splash(HZ*2, "Failed to open descriptions.");
return PLUGIN_ERROR;
}
/* seek to the right offset */
rb->lseek(fData, (off_t)reverse(word.offset), SEEK_SET);
/* Read in the description */
rb->read_line(fData, description, buffer_size);
/* And print it to debug. */
DEBUGF("Description: %s\n", description);
rb->close(fData);
/* display description. */
view_text(searchword, description);
return PLUGIN_OK;
}
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