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search.c
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search.c
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/*
* Copyright (c) 1997-2006 Motoyuki Kasahara
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "build-pre.h"
#include "eb.h"
#include "error.h"
#include "text.h"
#include "build-post.h"
/*
* Page-ID macros.
*/
#define PAGE_ID_IS_LEAF_LAYER(page_id) (((page_id) & 0x80) == 0x80)
#define PAGE_ID_IS_LAYER_START(page_id) (((page_id) & 0x40) == 0x40)
#define PAGE_ID_IS_LAYER_END(page_id) (((page_id) & 0x20) == 0x20)
#define PAGE_ID_HAVE_GROUP_ENTRY(page_id) (((page_id) & 0x10) == 0x10)
/*
* The maximum number of hit entries for tomporary hit lists.
* This is used in eb_hit_list().
*/
#define EB_TMP_MAX_HITS 64
/*
* Book-code of the book in which you want to search a word.
*/
static EB_Book_Code cache_book_code = EB_BOOK_NONE;
/*
* Cache buffer for the current page.
*/
static char cache_buffer[EB_SIZE_PAGE];
/*
* Cache buffer for the current page.
*/
static int cache_page;
/*
* Mutex for cache variables.
*/
#ifdef ENABLE_PTHREAD
static pthread_mutex_t cache_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
/*
* Unexported functions.
*/
static EB_Error_Code eb_hit_list_word(EB_Book *book,
EB_Search_Context *context, int max_hit_count, EB_Hit *hit_list,
int *hit_count);
static EB_Error_Code eb_hit_list_keyword(EB_Book *book,
EB_Search_Context *context, int max_hit_count, EB_Hit *hit_list,
int *hit_count);
static EB_Error_Code eb_hit_list_multi(EB_Book *book,
EB_Search_Context *context, int max_hit_count, EB_Hit *hit_list,
int *hit_count);
static void eb_and_hit_lists(EB_Hit and_list[EB_TMP_MAX_HITS],
int *and_count, int max_and_count, int hit_list_count,
EB_Hit hit_lists[EB_NUMBER_OF_SEARCH_CONTEXTS][EB_TMP_MAX_HITS],
int hit_counts[EB_NUMBER_OF_SEARCH_CONTEXTS]);
/*
* Intialize search contexts of `book'.
*/
void
eb_initialize_search_contexts(EB_Book *book)
{
EB_Search_Context *context;
int i;
LOG(("in: eb_initialize_search_context(book=%d)", (int)book->code));
for (i = 0, context = book->search_contexts;
i < EB_NUMBER_OF_SEARCH_CONTEXTS; i++, context++) {
context->code = EB_SEARCH_NONE;
context->compare_pre = NULL;
context->compare_single = NULL;
context->compare_group = NULL;
context->comparison_result = -1;
context->word[0] = '\0';
context->canonicalized_word[0] = '\0';
context->page = 0;
context->offset = 0;
context->page_id = 0;
context->entry_count = 0;
context->entry_index = 0;
context->entry_length = 0;
context->entry_arrangement = EB_ARRANGE_INVALID;
context->in_group_entry = 0;
context->keyword_heading.page = 0;
context->keyword_heading.offset = 0;
}
LOG(("out: eb_initialize_search_context()"));
}
/*
* Finalize search contexts of `book'.
*/
void
eb_finalize_search_contexts(EB_Book *book)
{
LOG(("in+out: eb_finalize_search_context(book=%d)", (int)book->code));
/* nothing to be done */
}
/*
* Reset search context of `book'.
*/
void
eb_reset_search_contexts(EB_Book *book)
{
LOG(("in: eb_reset_search_context(book=%d)", (int)book->code));
eb_initialize_search_contexts(book);
LOG(("out: eb_reset_search_context()"));
}
/*
* Intialize a search element.
*/
void
eb_initialize_search(EB_Search *search)
{
search->index_id = 0;
search->start_page = 0;
search->end_page = 0;
search->candidates_page = 0;
search->katakana = EB_INDEX_STYLE_CONVERT;
search->lower = EB_INDEX_STYLE_CONVERT;
search->mark = EB_INDEX_STYLE_DELETE;
search->long_vowel = EB_INDEX_STYLE_CONVERT;
search->double_consonant = EB_INDEX_STYLE_CONVERT;
search->contracted_sound = EB_INDEX_STYLE_CONVERT;
search->voiced_consonant = EB_INDEX_STYLE_CONVERT;
search->small_vowel = EB_INDEX_STYLE_CONVERT;
search->p_sound = EB_INDEX_STYLE_CONVERT;
search->space = EB_INDEX_STYLE_DELETE;
search->label[0] = '\0';
}
/*
* Finalize a search element.
*/
void
eb_finalize_search(EB_Search *search)
{
/* nothing to be done */
}
/*
* Initialize all search elements in the current subbook.
*/
void
eb_initialize_searches(EB_Book *book)
{
EB_Subbook *subbook;
EB_Multi_Search *multi;
EB_Search *entry;
int i, j;
LOG(("in: eb_initialize_searches(book=%d)", (int)book->code));
subbook = book->subbook_current;
eb_initialize_search(&subbook->word_alphabet);
eb_initialize_search(&subbook->word_asis);
eb_initialize_search(&subbook->word_kana);
eb_initialize_search(&subbook->endword_alphabet);
eb_initialize_search(&subbook->endword_asis);
eb_initialize_search(&subbook->endword_kana);
eb_initialize_search(&subbook->keyword);
eb_initialize_search(&subbook->cross);
eb_initialize_search(&subbook->menu);
eb_initialize_search(&subbook->image_menu);
eb_initialize_search(&subbook->copyright);
eb_initialize_search(&subbook->text);
eb_initialize_search(&subbook->sound);
for (i = 0, multi = subbook->multis; i < EB_MAX_MULTI_SEARCHES;
i++, multi++) {
eb_initialize_search(&multi->search);
multi->title[0] = '\0';
multi->entry_count = 0;
for (j = 0, entry = multi->entries;
j < EB_MAX_MULTI_ENTRIES; j++, entry++) {
eb_initialize_search(entry);
}
}
LOG(("out: eb_initialize_searches(book=%d)", (int)book->code));
}
/*
* Finalize all search elements in the current subbook.
*/
void
eb_finalize_searches(EB_Book *book)
{
EB_Subbook *subbook;
EB_Multi_Search *multi;
EB_Search *entry;
int i, j;
LOG(("in: eb_finalize_searches(book=%d)", (int)book->code));
subbook = book->subbook_current;
eb_finalize_search(&subbook->word_alphabet);
eb_finalize_search(&subbook->word_asis);
eb_finalize_search(&subbook->word_kana);
eb_finalize_search(&subbook->endword_alphabet);
eb_finalize_search(&subbook->endword_asis);
eb_finalize_search(&subbook->endword_kana);
eb_finalize_search(&subbook->keyword);
eb_finalize_search(&subbook->menu);
eb_finalize_search(&subbook->image_menu);
eb_finalize_search(&subbook->copyright);
eb_finalize_search(&subbook->text);
eb_finalize_search(&subbook->sound);
for (i = 0, multi = subbook->multis; i < EB_MAX_KEYWORDS;
i++, multi++) {
eb_finalize_search(&multi->search);
multi->entry_count = 0;
for (j = 0, entry = multi->entries;
j < multi->entry_count; j++, entry++) {
eb_finalize_search(entry);
}
}
LOG(("out: eb_finalize_searches()"));
}
/*
* Pre-search for a word described in the current search context.
* It descends intermediate indexes and reached to a leaf page that
* may have the word.
* If succeeded, 0 is returned. Otherwise -1 is returned.
*/
EB_Error_Code
eb_presearch_word(EB_Book *book, EB_Search_Context *context)
{
EB_Error_Code error_code;
int next_page;
int index_depth;
char *cache_p;
pthread_mutex_lock(&cache_mutex);
LOG(("in: eb_presearch_word(book=%d)", (int)book->code));
/*
* Discard cache data.
*/
cache_book_code = EB_BOOK_NONE;
/*
* Search the word in intermediate indexes.
* Find a page number of the leaf index page.
*/
for (index_depth = 0; index_depth < EB_MAX_INDEX_DEPTH; index_depth++) {
next_page = context->page;
/*
* Seek and read a page.
*/
if (zio_lseek(&book->subbook_current->text_zio,
((off_t) context->page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
cache_book_code = EB_BOOK_NONE;
error_code = EB_ERR_FAIL_SEEK_TEXT;
goto failed;
}
if (zio_read(&book->subbook_current->text_zio, cache_buffer,
EB_SIZE_PAGE) != EB_SIZE_PAGE) {
cache_book_code = EB_BOOK_NONE;
error_code = EB_ERR_FAIL_READ_TEXT;
goto failed;
}
/*
* Get some data from the read page.
*/
context->page_id = eb_uint1(cache_buffer);
context->entry_length = eb_uint1(cache_buffer + 1);
if (context->entry_length == 0)
context->entry_arrangement = EB_ARRANGE_VARIABLE;
else
context->entry_arrangement = EB_ARRANGE_FIXED;
context->entry_count = eb_uint2(cache_buffer + 2);
context->offset = 4;
cache_p = cache_buffer + 4;
LOG(("aux: eb_presearch_word(page=%d, page_id=0x%02x, \
entry_length=%d, entry_arrangement=%d, entry_count=%d)",
context->page, context->page_id, context->entry_length,
context->entry_arrangement, context->entry_count));
/*
* Exit the loop if it reached to the leaf index.
*/
if (PAGE_ID_IS_LEAF_LAYER(context->page_id))
break;
/*
* Search a page of next level index.
*/
for (context->entry_index = 0;
context->entry_index < context->entry_count;
context->entry_index++) {
if (EB_SIZE_PAGE < context->offset + context->entry_length + 4) {
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
if (context->compare_pre(context->canonicalized_word, cache_p,
context->entry_length) <= 0) {
next_page = eb_uint4(cache_p + context->entry_length);
break;
}
cache_p += context->entry_length + 4;
context->offset += context->entry_length + 4;
}
if (context->entry_count <= context->entry_index
|| context->page == next_page) {
context->comparison_result = -1;
goto succeeded;
}
context->page = next_page;
}
/*
* Check for the index depth.
*/
if (index_depth == EB_MAX_INDEX_DEPTH) {
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
/*
* Update search context and cache information.
*/
context->entry_index = 0;
context->comparison_result = 1;
context->in_group_entry = 0;
cache_book_code = book->code;
cache_page = context->page;
succeeded:
LOG(("out: eb_presearch_word() = %s", eb_error_string(EB_SUCCESS)));
pthread_mutex_unlock(&cache_mutex);
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
LOG(("out: eb_presearch_word() = %s", eb_error_string(error_code)));
pthread_mutex_unlock(&cache_mutex);
return error_code;
}
/*
* Get hit entries of a submitted search request.
*/
EB_Error_Code
eb_hit_list(EB_Book *book, int max_hit_count, EB_Hit *hit_list, int *hit_count)
{
EB_Error_Code error_code;
EB_Search_Context temporary_context;
EB_Hit temporary_hit_lists[EB_NUMBER_OF_SEARCH_CONTEXTS][EB_TMP_MAX_HITS];
int temporary_hit_counts[EB_NUMBER_OF_SEARCH_CONTEXTS];
int more_hit_count;
int i;
/*
* Lock cache data and the book.
*/
pthread_mutex_lock(&cache_mutex);
eb_lock(&book->lock);
LOG(("in: eb_hit_list(book=%d, max_hit_count=%d)", (int)book->code,
max_hit_count));
if (max_hit_count == 0)
goto succeeded;
*hit_count = 0;
/*
* Current subbook must have been set.
*/
if (book->subbook_current == NULL) {
error_code = EB_ERR_NO_CUR_SUB;
goto failed;
}
/*
* Get a list of hit entries.
*/
switch (book->search_contexts->code) {
case EB_SEARCH_EXACTWORD:
case EB_SEARCH_WORD:
case EB_SEARCH_ENDWORD:
/*
* In case of exactword, word of endword search.
*/
error_code = eb_hit_list_word(book, book->search_contexts,
max_hit_count, hit_list, hit_count);
if (error_code != EB_SUCCESS)
goto failed;
break;
case EB_SEARCH_KEYWORD:
case EB_SEARCH_CROSS:
/*
* In case of keyword or cross search.
*/
for (;;) {
int search_is_over = 0;
for (i = 0; i < EB_MAX_KEYWORDS; i++) {
if (book->search_contexts[i].code != EB_SEARCH_KEYWORD
&& book->search_contexts[i].code != EB_SEARCH_CROSS)
break;
memcpy(&temporary_context, book->search_contexts + i,
sizeof(EB_Search_Context));
error_code = eb_hit_list_keyword(book, &temporary_context,
EB_TMP_MAX_HITS, temporary_hit_lists[i],
temporary_hit_counts + i);
if (error_code != EB_SUCCESS)
goto failed;
if (temporary_hit_counts[i] == 0) {
search_is_over = 1;
break;
}
}
if (search_is_over)
break;
eb_and_hit_lists(hit_list + *hit_count, &more_hit_count,
max_hit_count - *hit_count, i, temporary_hit_lists,
temporary_hit_counts);
for (i = 0; i < EB_MAX_MULTI_ENTRIES; i++) {
if (book->search_contexts[i].code != EB_SEARCH_KEYWORD
&& book->search_contexts[i].code != EB_SEARCH_CROSS)
break;
error_code = eb_hit_list_keyword(book,
book->search_contexts + i, temporary_hit_counts[i],
temporary_hit_lists[i], temporary_hit_counts + i);
if (error_code != EB_SUCCESS)
goto failed;
}
*hit_count += more_hit_count;
if (max_hit_count <= *hit_count)
break;
}
break;
case EB_SEARCH_MULTI:
/*
* In case of multi search.
*/
for (;;) {
int search_is_over = 0;
for (i = 0; i < EB_MAX_MULTI_ENTRIES; i++) {
if (book->search_contexts[i].code != EB_SEARCH_MULTI)
break;
memcpy(&temporary_context, book->search_contexts + i,
sizeof(EB_Search_Context));
error_code = eb_hit_list_multi(book, &temporary_context,
EB_TMP_MAX_HITS, temporary_hit_lists[i],
temporary_hit_counts + i);
if (error_code != EB_SUCCESS)
goto failed;
if (temporary_hit_counts[i] == 0) {
search_is_over = 1;
break;
}
}
if (search_is_over)
break;
eb_and_hit_lists(hit_list + *hit_count, &more_hit_count,
max_hit_count - *hit_count, i, temporary_hit_lists,
temporary_hit_counts);
for (i = 0; i < EB_MAX_MULTI_ENTRIES; i++) {
if (book->search_contexts[i].code != EB_SEARCH_MULTI)
break;
error_code = eb_hit_list_multi(book,
book->search_contexts + i, temporary_hit_counts[i],
temporary_hit_lists[i], temporary_hit_counts + i);
if (error_code != EB_SUCCESS)
goto failed;
}
*hit_count += more_hit_count;
if (max_hit_count <= *hit_count)
break;
}
break;
default:
/* not reached */
error_code = EB_ERR_NO_PREV_SEARCH;
goto failed;
}
/*
* Unlock cache data and the book.
*/
succeeded:
LOG(("out: eb_hit_list(hit_count=%d) = %s",
*hit_count, eb_error_string(EB_SUCCESS)));
eb_unlock(&book->lock);
pthread_mutex_unlock(&cache_mutex);
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
*hit_count = 0;
LOG(("out: eb_hit_list() = %s", eb_error_string(error_code)));
eb_unlock(&book->lock);
pthread_mutex_unlock(&cache_mutex);
return error_code;
}
/*
* Get hit entries of a submitted exactword/word/endword search request.
*/
static EB_Error_Code
eb_hit_list_word(EB_Book *book, EB_Search_Context *context, int max_hit_count,
EB_Hit *hit_list, int *hit_count)
{
EB_Error_Code error_code;
EB_Hit *hit;
int group_id;
char *cache_p;
LOG(("in: eb_hit_list_word(book=%d, max_hit_count=%d)", (int)book->code,
max_hit_count));
hit = hit_list;
*hit_count = 0;
/*
* If the result of previous comparison is negative value, all
* matched entries have been found.
*/
if (context->comparison_result < 0 || max_hit_count <= 0)
goto succeeded;
for (;;) {
/*
* Read a page to search, if the page is not on the cache buffer.
*
* Cache may be missed by the two reasons:
* 1. the search process reaches to the end of an index page,
* and tries to read the next page.
* 2. Someone else used the cache buffer.
*
* At the case of 1, the search process reads the page and update
* the search context. At the case of 2. it reads the page but
* must not update the context!
*/
if (cache_book_code != book->code || cache_page != context->page) {
if (zio_lseek(&book->subbook_current->text_zio,
((off_t) context->page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
error_code = EB_ERR_FAIL_SEEK_TEXT;
goto failed;
}
if (zio_read(&book->subbook_current->text_zio,
cache_buffer, EB_SIZE_PAGE) != EB_SIZE_PAGE) {
error_code = EB_ERR_FAIL_READ_TEXT;
goto failed;
}
/*
* Update search context.
*/
if (context->entry_index == 0) {
context->page_id = eb_uint1(cache_buffer);
context->entry_length = eb_uint1(cache_buffer + 1);
if (context->entry_length == 0)
context->entry_arrangement = EB_ARRANGE_VARIABLE;
else
context->entry_arrangement = EB_ARRANGE_FIXED;
context->entry_count = eb_uint2(cache_buffer + 2);
context->entry_index = 0;
context->offset = 4;
}
cache_book_code = book->code;
cache_page = context->page;
}
cache_p = cache_buffer + context->offset;
LOG(("aux: eb_hit_list_word(page=%d, page_id=0x%02x, \
entry_length=%d, entry_arrangement=%d, entry_count=%d)",
context->page, context->page_id, context->entry_length,
context->entry_arrangement, context->entry_count));
if (!PAGE_ID_IS_LEAF_LAYER(context->page_id)) {
/*
* Not a leaf index. It is an error.
*/
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
if (!PAGE_ID_HAVE_GROUP_ENTRY(context->page_id)
&& context->entry_arrangement == EB_ARRANGE_FIXED) {
/*
* The leaf index doesn't have a group entry.
* Find text and heading locations.
*/
while (context->entry_index < context->entry_count) {
if (EB_SIZE_PAGE
< context->offset + context->entry_length + 12) {
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
/*
* Compare word and pattern.
* If matched, add it to a hit list.
*/
context->comparison_result
= context->compare_single(context->word, cache_p,
context->entry_length);
if (context->comparison_result == 0) {
hit->heading.page
= eb_uint4(cache_p + context->entry_length + 6);
hit->heading.offset
= eb_uint2(cache_p + context->entry_length + 10);
hit->text.page
= eb_uint4(cache_p + context->entry_length);
hit->text.offset
= eb_uint2(cache_p + context->entry_length + 4);
hit++;
*hit_count += 1;
}
context->entry_index++;
context->offset += context->entry_length + 12;
cache_p += context->entry_length + 12;
if (context->comparison_result < 0
|| max_hit_count <= *hit_count)
goto succeeded;
}
} else if (!PAGE_ID_HAVE_GROUP_ENTRY(context->page_id)
&& context->entry_arrangement == EB_ARRANGE_VARIABLE) {
/*
* The leaf index doesn't have a group entry.
* Find text and heading locations.
*/
while (context->entry_index < context->entry_count) {
if (EB_SIZE_PAGE < context->offset + 1) {
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
context->entry_length = eb_uint1(cache_p);
if (EB_SIZE_PAGE
< context->offset + context->entry_length + 13) {
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
/*
* Compare word and pattern.
* If matched, add it to a hit list.
*/
context->comparison_result
= context->compare_single(context->word, cache_p + 1,
context->entry_length);
if (context->comparison_result == 0) {
hit->heading.page
= eb_uint4(cache_p + context->entry_length + 7);
hit->heading.offset
= eb_uint2(cache_p + context->entry_length + 11);
hit->text.page
= eb_uint4(cache_p + context->entry_length + 1);
hit->text.offset
= eb_uint2(cache_p + context->entry_length + 5);
hit++;
*hit_count += 1;
}
context->entry_index++;
context->offset += context->entry_length + 13;
cache_p += context->entry_length + 13;
if (context->comparison_result < 0
|| max_hit_count <= *hit_count)
goto succeeded;
}
} else {
/*
* The leaf index have a group entry.
* Find text and heading locations.
*/
while (context->entry_index < context->entry_count) {
if (EB_SIZE_PAGE < context->offset + 2) {
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
group_id = eb_uint1(cache_p);
if (group_id == 0x00) {
/*
* 0x00 -- Single entry.
*/
context->entry_length = eb_uint1(cache_p + 1);
if (EB_SIZE_PAGE
< context->offset + context->entry_length + 14) {
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
/*
* Compare word and pattern.
* If matched, add it to a hit list.
*/
context->comparison_result
= context->compare_single(context->canonicalized_word,
cache_p + 2, context->entry_length);
if (context->comparison_result == 0) {
hit->heading.page
= eb_uint4(cache_p + context->entry_length + 8);
hit->heading.offset
= eb_uint2(cache_p + context->entry_length + 12);
hit->text.page
= eb_uint4(cache_p + context->entry_length + 2);
hit->text.offset
= eb_uint2(cache_p + context->entry_length + 6);
hit++;
*hit_count += 1;
}
context->in_group_entry = 0;
context->offset += context->entry_length + 14;
cache_p += context->entry_length + 14;
} else if (group_id == 0x80) {
/*
* 0x80 -- Start of group entry.
*/
context->entry_length = eb_uint1(cache_p + 1);
if (EB_SIZE_PAGE
< context->offset + context->entry_length + 4) {
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
context->comparison_result
= context->compare_single(context->canonicalized_word,
cache_p + 4, context->entry_length);
context->in_group_entry = 1;
cache_p += context->entry_length + 4;
context->offset += context->entry_length + 4;
} else if (group_id == 0xc0) {
/*
* Element of the group entry
*/
context->entry_length = eb_uint1(cache_p + 1);
if (EB_SIZE_PAGE < context->offset + 14) {
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
/*
* Compare word and pattern.
* If matched, add it to a hit list.
*/
if (context->comparison_result == 0
&& context->in_group_entry
&& context->compare_group(context->word, cache_p + 2,
context->entry_length) == 0) {
hit->heading.page
= eb_uint4(cache_p + context->entry_length + 8);
hit->heading.offset
= eb_uint2(cache_p + context->entry_length + 12);
hit->text.page
= eb_uint4(cache_p + context->entry_length + 2);
hit->text.offset
= eb_uint2(cache_p + context->entry_length + 6);
hit++;
*hit_count += 1;
}
context->offset += context->entry_length + 14;
cache_p += context->entry_length + 14;
} else {
/*
* Unknown group ID.
*/
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
context->entry_index++;
if (context->comparison_result < 0
|| max_hit_count <= *hit_count)
goto succeeded;
}
}
/*
* Go to a next page if available.
*/
if (PAGE_ID_IS_LAYER_END(context->page_id)) {
context->comparison_result = -1;
goto succeeded;
}
context->page++;
context->entry_index = 0;
}
succeeded:
LOG(("out: eb_hit_list_word(hit_count=%d) = %s",
*hit_count, eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
/*
* An error occurs...
* Discard cache if read error occurs.
*/
failed:
if (error_code == EB_ERR_FAIL_READ_TEXT)
cache_book_code = EB_BOOK_NONE;
*hit_count = 0;
LOG(("out: eb_hit_list_word() = %s", eb_error_string(error_code)));
return error_code;
}
/*
* Get hit entries of a submitted keyword search request.
*/
static EB_Error_Code
eb_hit_list_keyword(EB_Book *book, EB_Search_Context *context,
int max_hit_count, EB_Hit *hit_list, int *hit_count)
{
EB_Error_Code error_code;
EB_Text_Context text_context;
EB_Hit *hit;
int group_id;
char *cache_p;
LOG(("in: eb_hit_list_keyword(book=%d, max_hit_count=%d)",
(int)book->code, max_hit_count));
hit = hit_list;
*hit_count = 0;
/*
* Backup the text context in `book'.
*/
memcpy(&text_context, &book->text_context, sizeof(EB_Text_Context));
/*
* Seek text file.
*/
if (context->in_group_entry && context->comparison_result == 0) {
error_code = eb_seek_text(book, &context->keyword_heading);
if (error_code != EB_SUCCESS)
goto failed;
}
/*
* If the result of previous comparison is negative value, all
* matched entries have been found.
*/
if (context->comparison_result < 0 || max_hit_count <= 0)
goto succeeded;
for (;;) {
/*
* Read a page to search, if the page is not on the cache buffer.
*
* Cache may be missed by the two reasons:
* 1. the search process reaches to the end of an index page,
* and tries to read the next page.
* 2. Someone else used the cache buffer.
*
* At the case of 1, the search process reads the page and update
* the search context. At the case of 2. it reads the page but
* must not update the context!
*/
if (cache_book_code != book->code || cache_page != context->page) {
if (zio_lseek(&book->subbook_current->text_zio,
((off_t) context->page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
error_code = EB_ERR_FAIL_SEEK_TEXT;
goto failed;
}
if (zio_read(&book->subbook_current->text_zio, cache_buffer,
EB_SIZE_PAGE) != EB_SIZE_PAGE) {
error_code = EB_ERR_FAIL_READ_TEXT;
goto failed;
}
/*
* Update search context.
*/
if (context->entry_index == 0) {
context->page_id = eb_uint1(cache_buffer);
context->entry_length = eb_uint1(cache_buffer + 1);
if (context->entry_length == 0)
context->entry_arrangement = EB_ARRANGE_VARIABLE;
else
context->entry_arrangement = EB_ARRANGE_FIXED;
context->entry_count = eb_uint2(cache_buffer + 2);
context->entry_index = 0;
context->offset = 4;
}
cache_book_code = book->code;
cache_page = context->page;
}
cache_p = cache_buffer + context->offset;
LOG(("aux: eb_hit_list_keyword(page=%d, page_id=0x%02x, \
entry_length=%d, entry_arrangement=%d, entry_count=%d)",
context->page, context->page_id, context->entry_length,
context->entry_arrangement, context->entry_count));
if (!PAGE_ID_IS_LEAF_LAYER(context->page_id)) {
/*
* Not a leaf index. It is an error.
*/
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
if (!PAGE_ID_HAVE_GROUP_ENTRY(context->page_id)
&& context->entry_arrangement == EB_ARRANGE_FIXED) {
/*
* The leaf index doesn't have a group entry.
* Find text and heading locations.
*/
while (context->entry_index < context->entry_count) {
if (EB_SIZE_PAGE
< context->offset + context->entry_length + 12) {
error_code = EB_ERR_UNEXP_TEXT;
goto failed;
}
/*
* Compare word and pattern.
* If matched, add it to a hit list.
*/
context->comparison_result
= context->compare_single(context->word, cache_p,
context->entry_length);
if (context->comparison_result == 0) {
hit->heading.page
= eb_uint4(cache_p + context->entry_length + 6);