280 lines
7.7 KiB
C
280 lines
7.7 KiB
C
/* -*- C -*-
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* Copyright (c) 2001-2006 Motoyuki Kasahara
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "ebzip.h"
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#define zio_uint4(p) ((*(const unsigned char *)(p) << 24) \
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+ (*(const unsigned char *)((p) + 1) << 16) \
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+ (*(const unsigned char *)((p) + 2) << 8) \
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+ (*(const unsigned char *)((p) + 3)))
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/*
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* Delete compression information in START file of S-EBXA.
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* Return 0 if succeeds, -1 otherwise.
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*/
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int
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rewrite_sebxa_start(const char *file_name, int index_page)
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{
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char buffer[EB_SIZE_PAGE];
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int file = -1;
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int index_count;
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int removed_index_count;
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char *index_in_p;
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char *index_out_p;
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ssize_t done_length;
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ssize_t n;
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int i;
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if (index_page == 0)
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index_page = 1;
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/*
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* Output information.
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*/
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if (!ebzip_quiet_flag) {
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fprintf(stderr, _("==> rewrite %s <==\n"), file_name);
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fflush(stderr);
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}
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/*
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* Open the file.
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*/
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file = open(file_name, O_RDWR | O_BINARY);
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if (file < 0) {
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fprintf(stderr, _("%s: failed to open the file, %s: %s\n"),
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invoked_name, strerror(errno), file_name);
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goto failed;
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}
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/*
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* Read index page.
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*/
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if (lseek(file, ((off_t) index_page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
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fprintf(stderr, _("%s: failed to seek the file, %s: %s\n"),
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invoked_name, strerror(errno), file_name);
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goto failed;
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}
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done_length = 0;
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while (done_length < EB_SIZE_PAGE) {
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errno = 0;
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n = read(file, buffer + done_length, EB_SIZE_PAGE - done_length);
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if (n < 0) {
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if (errno == EINTR)
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continue;
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fprintf(stderr, _("%s: failed to read the file, %s: %s\n"),
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invoked_name, strerror(errno), file_name);
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goto failed;
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} else if (n == 0) {
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fprintf(stderr, _("%s: unexpected EOF: %s\n"),
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invoked_name, file_name);
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goto failed;
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} else {
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done_length += n;
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}
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}
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/*
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* Remove index 0x21 and 0x22.
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* They has comression information.
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*/
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index_count = *(unsigned char *)(buffer + 1);
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removed_index_count = 0;
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index_in_p = buffer + 16;
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index_out_p = buffer + 16;
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for (i = 0; i < index_count; i++, index_in_p += 16) {
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if (*index_in_p == 0x21 || *index_in_p == 0x22) {
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removed_index_count++;
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} else {
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if (index_in_p != index_out_p)
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memcpy(index_out_p, index_in_p, 16);
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index_out_p += 16;
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}
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}
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for (i = 0; i < removed_index_count; i++, index_out_p += 16) {
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memset(index_out_p, 0, 16);
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}
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*(unsigned char *)(buffer + 1) = index_count - removed_index_count;
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/*
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* Write back the index page.
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*/
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if (lseek(file, ((off_t) index_page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
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fprintf(stderr, _("%s: failed to seek the file, %s: %s\n"),
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invoked_name, strerror(errno), file_name);
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goto failed;
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}
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done_length = 0;
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while (done_length < EB_SIZE_PAGE) {
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errno = 0;
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n = write(file, buffer + done_length, EB_SIZE_PAGE - done_length);
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if (n < 0) {
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if (errno == EINTR)
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continue;
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fprintf(stderr, _("%s: failed to write the file, %s: %s\n"),
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invoked_name, strerror(errno), file_name);
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goto failed;
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} else {
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done_length += n;
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}
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}
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if (!ebzip_quiet_flag) {
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#if defined(PRINTF_LL_MODIFIER)
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fprintf(stderr, _("completed (%llu / %llu bytes)\n"),
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(unsigned long long) done_length,
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(unsigned long long) done_length);
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#elif defined(PRINTF_I64_MODIFIER)
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fprintf(stderr, _("completed (%I64u / %I64u bytes)\n"),
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(unsigned __int64) done_length,
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(unsigned __int64) done_length);
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#else
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fprintf(stderr, _("completed (%lu / %lu bytes)\n"),
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(unsigned long) done_length,
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(unsigned long) done_length);
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#endif
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fputc('\n', stderr);
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fflush(stderr);
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}
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close(file);
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return 0;
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failed:
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if (0 <= file)
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close(file);
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fputc('\n', stderr);
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return -1;
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}
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/*
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* Get compression information (`index_page', `index_location', `index_base',
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* `zio_start_location' and `zio_end_location') in START file.
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* Return 0 if succeeds, -1 otherwise.
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*/
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int
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get_sebxa_indexes(const char *file_name, int index_page, off_t *index_location,
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off_t *index_base, off_t *zio_start_location, off_t *zio_end_location)
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{
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char buffer[EB_SIZE_PAGE];
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int file = -1;
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int index_count;
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char *index_p;
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ssize_t done_length;
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ssize_t n;
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int page;
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int page_count;
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int i;
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*index_location = 0;
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*index_base = 0;
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*zio_start_location = 0;
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*zio_end_location = 0;
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if (index_page == 0)
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index_page = 1;
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/*
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* Open the file.
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*/
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file = open(file_name, O_RDONLY | O_BINARY);
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if (file < 0) {
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fprintf(stderr, _("%s: failed to open the file, %s: %s\n"),
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invoked_name, strerror(errno), file_name);
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goto failed;
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}
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/*
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* Read index page.
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*/
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if (lseek(file, ((off_t) index_page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
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fprintf(stderr, _("%s: failed to seek the file, %s: %s\n"),
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invoked_name, strerror(errno), file_name);
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goto failed;
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}
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done_length = 0;
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while (done_length < EB_SIZE_PAGE) {
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errno = 0;
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n = read(file, buffer + done_length, EB_SIZE_PAGE - done_length);
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if (n < 0) {
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if (errno == EINTR)
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continue;
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fprintf(stderr, _("%s: failed to read the file, %s: %s\n"),
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invoked_name, strerror(errno), file_name);
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goto failed;
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} else if (n == 0) {
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fprintf(stderr, _("%s: unexpected EOF: %s\n"),
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invoked_name, file_name);
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goto failed;
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} else {
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done_length += n;
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}
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}
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/*
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* Get information in index 0x21 and 0x22.
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* They has comression information.
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*/
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index_count = *(unsigned char *)(buffer + 1);
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index_p = buffer + 16;
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for (i = 0; i < index_count; i++, index_p += 16) {
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page = zio_uint4(index_p + 2);
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page_count = zio_uint4(index_p + 6);
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switch (*index_p) {
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case 0x00:
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*zio_start_location
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= ((off_t) page - 1) * EB_SIZE_PAGE;
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*zio_end_location
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= ((off_t) page + page_count - 1) * EB_SIZE_PAGE - 1;
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break;
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case 0x21:
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*index_base = ((off_t) page - 1) * EB_SIZE_PAGE;
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break;
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case 0x22:
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*index_location = ((off_t) page - 1) * EB_SIZE_PAGE;
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break;
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}
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}
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close(file);
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return 0;
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failed:
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if (0 <= file)
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close(file);
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fputc('\n', stderr);
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return -1;
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}
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