/*
 * 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 "appendix.h"
#include "build-post.h"

/*
 * Unexported functions.
 */
static EB_Error_Code eb_load_appendix_subbook(EB_Appendix *appendix);
static EB_Error_Code eb_set_appendix_subbook_eb(EB_Appendix *appendix,
    EB_Subbook_Code subbook_code);
static EB_Error_Code eb_set_appendix_subbook_epwing(EB_Appendix *appendix,
    EB_Subbook_Code subbook_code);

/*
 * Initialize all subbooks in `appendix'.
 */
void
eb_initialize_appendix_subbooks(EB_Appendix *appendix)
{
    EB_Appendix_Subbook *subbook;
    int i;

    LOG(("in: eb_initialize_appendix_subbooks(appendix=%d)",
    (int)appendix->code));

    for (i = 0, subbook = appendix->subbooks; i < appendix->subbook_count;
     i++, subbook++) {
    subbook->initialized = 0;
    subbook->code = i;
    subbook->directory_name[0] = '\0';
    subbook->data_directory_name[0] = '\0';
    subbook->file_name[0] = '\0';
    subbook->character_code = EB_CHARCODE_INVALID;
    subbook->narrow_start = -1;
    subbook->wide_start = -1;
    subbook->narrow_end = -1;
    subbook->wide_end = -1;
    subbook->narrow_page = 0;
    subbook->wide_page = 0;
    subbook->stop_code0 = 0;
    subbook->stop_code1 = 0;
    zio_initialize(&subbook->zio);
    }

    LOG(("out: eb_initialize_appendix_subbooks()"));
}


/*
 * Initialize subbooks in `appendix'.
 */
void
eb_finalize_appendix_subbooks(EB_Appendix *appendix)
{
    EB_Appendix_Subbook *subbook;
    int i;

    LOG(("in: eb_finalize_appendix_subbooks(appendix=%d)",
    (int)appendix->code));

    for (i = 0, subbook = appendix->subbooks; i < appendix->subbook_count;
     i++, subbook++) {
    zio_finalize(&appendix->subbooks[i].zio);
    }

    LOG(("out: eb_finalize_appendix_subbooks()"));
}


/*
 * Load all subbooks in `appendix'.
 */
static EB_Error_Code
eb_load_appendix_subbook(EB_Appendix *appendix)
{
    EB_Error_Code error_code;
    EB_Appendix_Subbook *subbook;
    char buffer[16];
    int stop_code_page;
    int character_count;

    LOG(("in: eb_load_appendix_subbook(appendix=%d)", (int)appendix->code));

    subbook = appendix->subbook_current;

    /*
     * Check for the current status.
     */
    if (subbook == NULL) {
    error_code = EB_ERR_NO_CUR_APPSUB;
    goto failed;
    }

    /*
     * If the subbook has already initialized, return immediately.
     */
    if (subbook->initialized != 0)
    goto succeeded;

    /*
     * Rewind the APPENDIX file.
     */
    if (zio_lseek(&subbook->zio, 0, SEEK_SET) < 0) {
    error_code = EB_ERR_FAIL_SEEK_APP;
    goto failed;
    }

    /*
     * Set character code used in the appendix.
     */
    if (zio_read(&subbook->zio, buffer, 16) != 16) {
    error_code = EB_ERR_FAIL_READ_APP;
    goto failed;
    }
    subbook->character_code = eb_uint2(buffer + 2);

    /*
     * Set information about alternation text of wide font.
     */
    if (zio_read(&subbook->zio, buffer, 16) != 16) {
    error_code = EB_ERR_FAIL_READ_APP;
    goto failed;
    }
    character_count = eb_uint2(buffer + 12);

    if (0 < character_count) {
    subbook->narrow_page = eb_uint4(buffer);
    subbook->narrow_start = eb_uint2(buffer + 10);

    if (subbook->character_code == EB_CHARCODE_ISO8859_1) {
        subbook->narrow_end = subbook->narrow_start
        + ((character_count / 0xfe) << 8) + (character_count % 0xfe)
        - 1;
        if (0xfe < (subbook->narrow_end & 0xff))
        subbook->narrow_end += 3;

        if ((subbook->narrow_start & 0xff) < 0x01
        || 0xfe < (subbook->narrow_start & 0xff)
        || subbook->narrow_start < 0x0001
        || 0x1efe < subbook->narrow_end) {
        error_code = EB_ERR_UNEXP_APP;
        goto failed;
        }
    } else {
        subbook->narrow_end = subbook->narrow_start
        + ((character_count / 0x5e) << 8) + (character_count % 0x5e)
        - 1;
        if (0x7e < (subbook->narrow_end & 0xff))
        subbook->narrow_end += 0xa3;

        if ((subbook->narrow_start & 0xff) < 0x21
        || 0x7e < (subbook->narrow_start & 0xff)
        || subbook->narrow_start < 0xa121
        || 0xfe7e < subbook->narrow_end) {
        error_code = EB_ERR_UNEXP_APP;
        goto failed;
        }
    }
    }

    /*
     * Set information about alternation text of wide font.
     */
    if (zio_read(&subbook->zio, buffer, 16) != 16) {
    error_code = EB_ERR_FAIL_READ_APP;
    goto failed;
    }
    character_count = eb_uint2(buffer + 12);

    if (0 < character_count) {
    subbook->wide_page = eb_uint4(buffer);
    subbook->wide_start = eb_uint2(buffer + 10);

    if (subbook->character_code == EB_CHARCODE_ISO8859_1) {
        subbook->wide_end = subbook->wide_start
        + ((character_count / 0xfe) << 8) + (character_count % 0xfe)
        - 1;
        if (0xfe < (subbook->wide_end & 0xff))
        subbook->wide_end += 3;

        if ((subbook->wide_start & 0xff) < 0x01
        || 0xfe < (subbook->wide_start & 0xff)
        || subbook->wide_start < 0x0001
        || 0x1efe < subbook->wide_end) {
        error_code = EB_ERR_UNEXP_APP;
        goto failed;
        }
    } else {
        subbook->wide_end = subbook->wide_start
        + ((character_count / 0x5e) << 8) + (character_count % 0x5e)
        - 1;
        if (0x7e < (subbook->wide_end & 0xff))
        subbook->wide_end += 0xa3;

        if ((subbook->wide_start & 0xff) < 0x21
        || 0x7e < (subbook->wide_start & 0xff)
        || subbook->wide_start < 0xa121
        || 0xfe7e < subbook->wide_end) {
        error_code = EB_ERR_UNEXP_APP;
        goto failed;
        }
    }
    }

    /*
     * Set stop-code.
     */
    if (zio_read(&subbook->zio, buffer, 16) != 16) {
    error_code = EB_ERR_FAIL_READ_APP;
    goto failed;
    }
    stop_code_page = eb_uint4(buffer);
    if (0 < stop_code_page) {
      if (zio_lseek(&subbook->zio, ((off_t) stop_code_page - 1) * EB_SIZE_PAGE,
        SEEK_SET) < 0) {
        error_code = EB_ERR_FAIL_SEEK_APP;
        goto failed;
    }
    if (zio_read(&subbook->zio, buffer, 16) != 16) {
        error_code = EB_ERR_FAIL_READ_APP;
        goto failed;
    }
    if (eb_uint2(buffer) != 0) {
        subbook->stop_code0 = eb_uint2(buffer + 2);
        subbook->stop_code1 = eb_uint2(buffer + 4);
    }
    }

    /*
     * Rewind the file descriptor, again.
     */
    if (zio_lseek(&subbook->zio, 0, SEEK_SET) < 0) {
    error_code = EB_ERR_FAIL_SEEK_APP;
    goto failed;
    }

    /*
     * Initialize the alternation text cache.
     */
    eb_initialize_alt_caches(appendix);

  succeeded:
    LOG(("out: eb_load_appendix_subbook() = %s", eb_error_string(EB_SUCCESS)));
    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    LOG(("out: eb_load_appendix_subbook() = %s", eb_error_string(error_code)));
    return error_code;
}


/*
 * Load all subbooks in the book.
 */
EB_Error_Code
eb_load_all_appendix_subbooks(EB_Appendix *appendix)
{
    EB_Error_Code error_code;
    EB_Subbook_Code current_subbook_code;
    EB_Appendix_Subbook *subbook;
    int i;

    LOG(("in: eb_load_all_appendix_subbooks(appendix=%d)",
    (int)appendix->code));

    /*
     * The appendix must have been bound.
     */
    if (appendix->path == NULL) {
    error_code = EB_ERR_UNBOUND_APP;
    goto failed;
    }

    /*
     * Get the current subbook.
     */
    if (appendix->subbook_current != NULL)
    current_subbook_code = appendix->subbook_current->code;
    else
    current_subbook_code = -1;

    /*
     * Initialize each subbook.
     */
    for (i = 0, subbook = appendix->subbooks;
     i < appendix->subbook_count; i++, subbook++) {
    error_code = eb_set_appendix_subbook(appendix, subbook->code);
    if (error_code != EB_SUCCESS)
        goto failed;
    }

    /*
     * Restore the current subbook.
     */
    if (current_subbook_code < 0)
    eb_unset_appendix_subbook(appendix);
    else {
    error_code = eb_set_appendix_subbook(appendix, current_subbook_code);
    if (error_code != EB_SUCCESS)
        goto failed;
    }

    LOG(("out: eb_load_all_appendix_subbooks() = %s",
    eb_error_string(EB_SUCCESS)));

    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    LOG(("out: eb_load_all_appendix_subbooks() = %s",
    eb_error_string(error_code)));
    return error_code;
}


/*
 * Get a subbook list in `appendix'.
 */
EB_Error_Code
eb_appendix_subbook_list(EB_Appendix *appendix, EB_Subbook_Code *subbook_list,
    int *subbook_count)
{
    EB_Error_Code error_code;
    EB_Subbook_Code *list_p;
    int i;

    LOG(("in: eb_appendix_subbook_list(appendix=%d)", (int)appendix->code));

    /*
     * Check for the current status.
     */
    if (appendix->path == NULL) {
    error_code = EB_ERR_UNBOUND_APP;
    goto failed;
    }

    /*
     * Make a subbook list.
     */
    for (i = 0, list_p = subbook_list; i < appendix->subbook_count;
     i++, list_p++)
    *list_p = i;
    *subbook_count = appendix->subbook_count;

    LOG(("out: eb_appendix_subbook_list(subbook_count=%d) = %s",
    *subbook_count, eb_error_string(EB_SUCCESS)));

    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    *subbook_count = 0;
    LOG(("out: eb_appendix_subbook_list() = %s", eb_error_string(error_code)));
    return error_code;
}


/*
 * Get the subbook-code of the current subbook in `appendix'.
 */
EB_Error_Code
eb_appendix_subbook(EB_Appendix *appendix, EB_Subbook_Code *subbook_code)
{
    EB_Error_Code error_code;

    LOG(("in: eb_appendix_subbook(appendix=%d)", (int)appendix->code));

    /*
     * Check for the current status.
     */
    if (appendix->subbook_current == NULL) {
    error_code = EB_ERR_NO_CUR_APPSUB;
    goto failed;
    }

    /*
     * Copy the current subbook code to `subbook_code'.
     */
    *subbook_code = appendix->subbook_current->code;

    LOG(("out: eb_appendix_subbook(subbook=%d) = %s", (int)*subbook_code,
    eb_error_string(EB_SUCCESS)));

    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    *subbook_code = EB_SUBBOOK_INVALID;
    LOG(("out: eb_appendix_subbook() = %s", eb_error_string(error_code)));
    return error_code;
}


/*
 * Get the directory name of the current subbook in `appendix'.
 */
EB_Error_Code
eb_appendix_subbook_directory(EB_Appendix *appendix, char *directory)
{
    EB_Error_Code error_code;

    LOG(("in: eb_appendix_subbook_directory(appendix=%d)",
    (int)appendix->code));

    /*
     * Check for the current status.
     */
    if (appendix->subbook_current == NULL) {
    error_code = EB_ERR_NO_CUR_APPSUB;
    goto failed;
    }

    /*
     * Copy the directory name to `directory'.
     */
    strcpy(directory, appendix->subbook_current->directory_name);

    LOG(("out: eb_appendix_subbook_directory(directory=%s) = %s",
    directory, eb_error_string(EB_SUCCESS)));

    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    *directory = '\0';
    LOG(("out: eb_appendix_subbook_directory() = %s",
    eb_error_string(error_code)));
    return error_code;
}


/*
 * Get the directory name of the subbook `subbook_code' in `appendix'.
 */
EB_Error_Code
eb_appendix_subbook_directory2(EB_Appendix *appendix,
    EB_Subbook_Code subbook_code, char *directory)
{
    EB_Error_Code error_code;

    LOG(("in: eb_appendix_subbook_directory2(appendix=%d, subbook=%d)",
    (int)appendix->code, (int)subbook_code));

    /*
     * Check for the current status.
     */
    if (appendix->path == NULL) {
    error_code = EB_ERR_UNBOUND_APP;
    goto failed;
    }

    /*
     * Check for `subbook_code'.
     */
    if (subbook_code < 0 || appendix->subbook_count <= subbook_code) {
    error_code = EB_ERR_NO_SUCH_APPSUB;
    goto failed;
    }

    /*
     * Copy the directory name to `directory'.
     */
    strcpy(directory, (appendix->subbooks + subbook_code)->directory_name);

    LOG(("out: eb_appendix_subbook_directory2(directory=%s) = %s",
    directory, eb_error_string(EB_SUCCESS)));

    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    *directory = '\0';
    LOG(("out: eb_appendix_subbook_directory2() = %s",
    eb_error_string(error_code)));
    return error_code;
}


/*
 * Set the subbook `subbook_code' as the current subbook.
 */
EB_Error_Code
eb_set_appendix_subbook(EB_Appendix *appendix, EB_Subbook_Code subbook_code)
{
    EB_Error_Code error_code;

    LOG(("in: eb_set_appendix_subbook(appendix=%d, subbook=%d)",
    (int)appendix->code, (int)subbook_code));

    /*
     * Check for the current status.
     */
    if (appendix->path == NULL) {
    error_code = EB_ERR_UNBOUND_APP;
    goto failed;
    }

    /*
     * Check for `subbook_code'.
     */
    if (subbook_code < 0 || appendix->subbook_count <= subbook_code) {
    error_code = EB_ERR_NO_SUCH_APPSUB;
    goto failed;
    }

    /*
     * If the current subbook is `subbook_code', return immediately.
     * Otherwise close the current subbook and continue.
     */
    if (appendix->subbook_current != NULL) {
    if (appendix->subbook_current->code == subbook_code)
        goto succeeded;
    eb_unset_appendix_subbook(appendix);
    }

    /*
     * Disc type specific section.
     */
    if (appendix->disc_code == EB_DISC_EB)
    error_code = eb_set_appendix_subbook_eb(appendix, subbook_code);
    else
    error_code = eb_set_appendix_subbook_epwing(appendix, subbook_code);

    if (error_code != EB_SUCCESS)
    goto failed;

    /*
     * Load the subbook.
     */
    error_code = eb_load_appendix_subbook(appendix);
    if (error_code != EB_SUCCESS)
    goto failed;

  succeeded:
    LOG(("out: eb_set_appendix_subbook() = %s", eb_error_string(EB_SUCCESS)));

    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    if (appendix->subbook_current != NULL)
    zio_close(&appendix->subbook_current->zio);
    appendix->subbook_current = NULL;
    LOG(("out: eb_set_appendix_subbook() = %s", eb_error_string(error_code)));
    return error_code;
}


/*
 * EB* specific section of eb_set_appendix_subbook().
 */
static EB_Error_Code
eb_set_appendix_subbook_eb(EB_Appendix *appendix, EB_Subbook_Code subbook_code)
{
    EB_Error_Code error_code;
    EB_Appendix_Subbook *subbook;
    char appendix_path_name[EB_MAX_PATH_LENGTH + 1];
    Zio_Code zio_code;

    LOG(("in: eb_set_appendix_subbook_eb(appendix=%d, subbook=%d)",
    (int)appendix->code, (int)subbook_code));

    /*
     * Set the current subbook.
     */
    appendix->subbook_current = appendix->subbooks + subbook_code;
    subbook = appendix->subbook_current;

    /*
     * Open an appendix file.
     */
    if (eb_find_file_name2(appendix->path, subbook->directory_name,
    EB_FILE_NAME_APPENDIX, subbook->file_name) != EB_SUCCESS) {
    error_code = EB_ERR_FAIL_OPEN_APP;
    goto failed;
    }

    eb_compose_path_name2(appendix->path, subbook->directory_name,
    subbook->file_name, appendix_path_name);
    eb_path_name_zio_code(appendix_path_name, ZIO_PLAIN, &zio_code);

    if (zio_open(&subbook->zio, appendix_path_name, zio_code) < 0) {
    error_code = EB_ERR_FAIL_OPEN_APP;
    goto failed;
    }

    LOG(("out: eb_set_appendix_subbook_eb() = %s",
    eb_error_string(EB_SUCCESS)));
    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    LOG(("out: eb_set_appendix_subbook_eb() = %s",
    eb_error_string(error_code)));
    return error_code;
}


/*
 * EPWING specific section of eb_set_appendix_subbook().
 */
static EB_Error_Code
eb_set_appendix_subbook_epwing(EB_Appendix *appendix,
    EB_Subbook_Code subbook_code)
{
    EB_Error_Code error_code;
    EB_Appendix_Subbook *subbook;
    char appendix_path_name[EB_MAX_PATH_LENGTH + 1];
    Zio_Code zio_code;

    LOG(("in: eb_set_appendix_subbook_epwing(appendix=%d, subbook=%d)",
    (int)appendix->code, (int)subbook_code));

    /*
     * Set the current subbook.
     */
    appendix->subbook_current = appendix->subbooks + subbook_code;
    subbook = appendix->subbook_current;

    zio_initialize(&subbook->zio);

    /*
     * Adjust a directory name.
     */
    strcpy(subbook->data_directory_name, EB_DIRECTORY_NAME_DATA);
    eb_fix_directory_name2(appendix->path, subbook->directory_name,
    subbook->data_directory_name);

    /*
     * Open an appendix file.
     */
    if (eb_find_file_name3(appendix->path, subbook->directory_name,
    subbook->data_directory_name, EB_FILE_NAME_FUROKU, subbook->file_name)
    != EB_SUCCESS) {
    error_code = EB_ERR_FAIL_OPEN_APP;
    goto failed;
    }

    eb_compose_path_name3(appendix->path, subbook->directory_name,
    subbook->data_directory_name, subbook->file_name,
    appendix_path_name);
    eb_path_name_zio_code(appendix_path_name, ZIO_PLAIN, &zio_code);

    if (zio_open(&subbook->zio, appendix_path_name, zio_code) < 0) {
    subbook = NULL;
    error_code = EB_ERR_FAIL_OPEN_APP;
    goto failed;
    }

    LOG(("out: eb_set_appendix_subbook_epwing() = %s",
    eb_error_string(EB_SUCCESS)));
    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    LOG(("out: eb_set_appendix_subbook_epwing() = %s",
    eb_error_string(error_code)));
    return error_code;
}


/*
 * Unset the current subbook.
 */
void
eb_unset_appendix_subbook(EB_Appendix *appendix)
{
    LOG(("in: eb_unset_appendix_subbook(appendix=%d)", (int)appendix->code));

    /*
     * Close a file for the current subbook.
     */
    if (appendix->subbook_current != NULL) {
    zio_close(&appendix->subbook_current->zio);
    appendix->subbook_current = NULL;
    }

    LOG(("out: eb_unset_appendix_subbook()"));
}