/*
* 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"
/*
* The maximum number of arguments for an escape sequence.
*/
#define EB_MAX_ARGV 7
/*
* Read next when the length of cached data is shorter than this value.
*/
#define SIZE_FEW_REST 48
/*
* Special skip-code that represents `no skip-code is set'.
*/
#define SKIP_CODE_NONE -1
/*
* Cache data buffer.
*/
static char cache_buffer[EB_SIZE_PAGE];
/*
* Book code of which `cache_buffer' records data.
*/
static EB_Book_Code cache_book_code = EB_BOOK_NONE;
/*
* Location of cache data loaded in `cache_buffer'.
*/
static off_t cache_location;
/*
* Length of cache data loaded in `cache_buffer'.
*/
static size_t cache_length;
/*
* Null hook.
*/
static const EB_Hook null_hook = {EB_HOOK_NULL, NULL};
/*
* Mutex for cache variables.
*/
#ifdef ENABLE_PTHREAD
static pthread_mutex_t cache_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
/*
* Unexported functions.
*/
static EB_Error_Code eb_read_text_internal(EB_Book *book,
EB_Appendix *appendix, EB_Hookset *hookset, void *container,
size_t text_max_length, char *text, ssize_t *text_length,
int forward_only);
static int eb_is_stop_code(EB_Book *book, EB_Appendix *appendix,
unsigned int code0, unsigned int code1);
/*
* Initialize text context of `book'.
*/
void
eb_initialize_text_context(EB_Book *book)
{
LOG(("in: eb_initialize_text_context(book=%d)", (int)book->code));
book->text_context.code = EB_TEXT_INVALID;
book->text_context.location = -1;
book->text_context.out = NULL;
book->text_context.out_rest_length = 0;
book->text_context.unprocessed = NULL;
book->text_context.unprocessed_size = 0;
book->text_context.out_step = 0;
book->text_context.narrow_flag = 0;
book->text_context.printable_count = 0;
book->text_context.file_end_flag = 0;
book->text_context.text_status = EB_TEXT_STATUS_CONTINUED;
book->text_context.skip_code = SKIP_CODE_NONE;
book->text_context.auto_stop_code = -1;
book->text_context.candidate[0] = '\0';
book->text_context.is_candidate = 0;
book->text_context.ebxac_gaiji_flag = 0;
LOG(("out: eb_initialize_text_context()"));
}
/*
* Finalize text context of `book'.
*/
void
eb_finalize_text_context(EB_Book *book)
{
LOG(("in: eb_finalize_text_context(book=%d)", (int)book->code));
if (book->text_context.unprocessed != NULL)
free(book->text_context.unprocessed);
LOG(("out: eb_finalize_text_context()"));
}
/*
* Reset text context of `book'.
* Note that `contexxt_code' and `context_location' are unchanged.
*/
void
eb_reset_text_context(EB_Book *book)
{
LOG(("in: eb_reset_text_context(book=%d)", (int)book->code));
eb_finalize_text_context(book);
book->text_context.out = NULL;
book->text_context.out_rest_length = 0;
book->text_context.unprocessed = NULL;
book->text_context.unprocessed_size = 0;
book->text_context.out_step = 0;
book->text_context.narrow_flag = 0;
book->text_context.printable_count = 0;
book->text_context.file_end_flag = 0;
book->text_context.text_status = EB_TEXT_STATUS_CONTINUED;
book->text_context.skip_code = SKIP_CODE_NONE;
book->text_context.auto_stop_code = -1;
book->text_context.candidate[0] = '\0';
book->text_context.is_candidate = 0;
book->text_context.ebxac_gaiji_flag = 0;
LOG(("out: eb_reset_text_context()"));
}
/*
* Invalidate text context of `book'.
*/
void
eb_invalidate_text_context(EB_Book *book)
{
LOG(("in: eb_invalidate_text_context(book=%d)", (int)book->code));
eb_finalize_text_context(book);
eb_initialize_text_context(book);
book->text_context.code = EB_TEXT_INVALID;
LOG(("out: eb_invalidate_text_context()"));
}
/*
* Reposition the offset of the subbook file.
*/
EB_Error_Code
eb_seek_text(EB_Book *book, const EB_Position *position)
{
EB_Error_Code error_code;
pthread_mutex_lock(&cache_mutex);
eb_lock(&book->lock);
LOG(("in: eb_seek_text(book=%d, position={%d,%d})", (int)book->code,
position->page, position->offset));
/*
* Current subbook must have been set and START file must exist.
*/
if (book->subbook_current == NULL) {
error_code = EB_ERR_NO_CUR_SUB;
goto failed;
}
if (zio_file(&book->subbook_current->text_zio) < 0) {
error_code = EB_ERR_NO_TEXT;
goto failed;
}
if (position->page <= 0 || position->offset < 0) {
error_code = EB_ERR_FAIL_SEEK_TEXT;
goto failed;
}
/*
* Set text-context variables.
*/
eb_reset_text_context(book);
book->text_context.code = EB_TEXT_SEEKED;
book->text_context.location = ((off_t) position->page - 1) * EB_SIZE_PAGE
+ position->offset;
/*
* Unlock cache data and the book.
*/
LOG(("out: eb_seek_text() = %s", eb_error_string(EB_SUCCESS)));
eb_unlock(&book->lock);
pthread_mutex_unlock(&cache_mutex);
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
eb_invalidate_text_context(book);
LOG(("out: eb_seek_text() = %s", eb_error_string(error_code)));
eb_unlock(&book->lock);
pthread_mutex_unlock(&cache_mutex);
return error_code;
}
/*
* Get the current text position of the subbook file.
*/
EB_Error_Code
eb_tell_text(EB_Book *book, EB_Position *position)
{
EB_Error_Code error_code;
eb_lock(&book->lock);
LOG(("in: eb_tell_text(book=%d)", (int)book->code));
/*
* Current subbook must have been set and START file must exist.
*/
if (book->subbook_current == NULL) {
error_code = EB_ERR_NO_CUR_SUB;
goto failed;
}
if (zio_file(&book->subbook_current->text_zio) < 0) {
error_code = EB_ERR_NO_TEXT;
goto failed;
}
position->page = book->text_context.location / EB_SIZE_PAGE + 1;
position->offset = book->text_context.location % EB_SIZE_PAGE;
LOG(("out: eb_seek_text(position={%d,%d}) = %s",
position->page, position->offset, eb_error_string(EB_SUCCESS)));
eb_unlock(&book->lock);
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
eb_invalidate_text_context(book);
LOG(("out: eb_seek_text() = %s", eb_error_string(error_code)));
eb_unlock(&book->lock);
return error_code;
}
/*
* Get text in the current subbook in `book'.
*/
EB_Error_Code
eb_read_text(EB_Book *book, EB_Appendix *appendix, EB_Hookset *hookset,
void *container, size_t text_max_length, char *tex
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- #完美解决问题
- #运行顺畅
- #内容详尽
- #全网独家
- #注释完整
- xiayangwf2013-03-19正在学习日语,这个还是挺有帮助的。
- lostinheart2012-12-15源码……不是成品
- kingfeng2012-07-05挺好,代码值得学习
- draculame2012-08-28我靠。。。是代码啊。。。我上当了。。不过怪我自己没看清。。。
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