epwing 词典外壳软件 ebu 4.4.3

/* * 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