/* -*- C -*-
* Copyright (c) 2001-2006 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 "ebzip.h"
#define zio_uint4(p) ((*(const unsigned char *)(p) << 24) \
+ (*(const unsigned char *)((p) + 1) << 16) \
+ (*(const unsigned char *)((p) + 2) << 8) \
+ (*(const unsigned char *)((p) + 3)))
/*
* Delete compression information in START file of S-EBXA.
* Return 0 if succeeds, -1 otherwise.
*/
int
rewrite_sebxa_start(const char *file_name, int index_page)
{
char buffer[EB_SIZE_PAGE];
int file = -1;
int index_count;
int removed_index_count;
char *index_in_p;
char *index_out_p;
ssize_t done_length;
ssize_t n;
int i;
if (index_page == 0)
index_page = 1;
/*
* Output information.
*/
if (!ebzip_quiet_flag) {
fprintf(stderr, _("==> rewrite %s <==\n"), file_name);
fflush(stderr);
}
/*
* Open the file.
*/
file = open(file_name, O_RDWR | O_BINARY);
if (file < 0) {
fprintf(stderr, _("%s: failed to open the file, %s: %s\n"),
invoked_name, strerror(errno), file_name);
goto failed;
}
/*
* Read index page.
*/
if (lseek(file, (index_page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
fprintf(stderr, _("%s: failed to seek the file, %s: %s\n"),
invoked_name, strerror(errno), file_name);
goto failed;
}
done_length = 0;
while (done_length < EB_SIZE_PAGE) {
errno = 0;
n = read(file, buffer + done_length, EB_SIZE_PAGE - done_length);
if (n < 0) {
if (errno == EINTR)
continue;
fprintf(stderr, _("%s: failed to read the file, %s: %s\n"),
invoked_name, strerror(errno), file_name);
goto failed;
} else if (n == 0) {
fprintf(stderr, _("%s: unexpected EOF: %s\n"),
invoked_name, file_name);
goto failed;
} else {
done_length += n;
}
}
/*
* Remove index 0x21 and 0x22.
* They has comression information.
*/
index_count = *(unsigned char *)(buffer + 1);
removed_index_count = 0;
index_in_p = buffer + 16;
index_out_p = buffer + 16;
for (i = 0; i < index_count; i++, index_in_p += 16) {
if (*index_in_p == 0x21 || *index_in_p == 0x22) {
removed_index_count++;
} else {
if (index_in_p != index_out_p)
memcpy(index_out_p, index_in_p, 16);
index_out_p += 16;
}
}
for (i = 0; i < removed_index_count; i++, index_out_p += 16) {
memset(index_out_p, 0, 16);
}
*(unsigned char *)(buffer + 1) = index_count - removed_index_count;
/*
* Write back the index page.
*/
if (lseek(file, (index_page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
fprintf(stderr, _("%s: failed to seek the file, %s: %s\n"),
invoked_name, strerror(errno), file_name);
goto failed;
}
done_length = 0;
while (done_length < EB_SIZE_PAGE) {
errno = 0;
n = write(file, buffer + done_length, EB_SIZE_PAGE - done_length);
if (n < 0) {
if (errno == EINTR)
continue;
fprintf(stderr, _("%s: failed to write the file, %s: %s\n"),
invoked_name, strerror(errno), file_name);
goto failed;
} else {
done_length += n;
}
}
if (!ebzip_quiet_flag) {
fprintf(stderr, _("completed (%lu / %lu bytes)\n"),
(unsigned long)done_length, (unsigned long)done_length);
fputc('\n', stderr);
fflush(stderr);
}
close(file);
return 0;
failed:
if (0 <= file)
close(file);
fputc('\n', stderr);
return -1;
}
/*
* Get compression information (`index_page', `index_location', `index_base',
* `zio_start_location' and `zio_end_location') in START file.
* Return 0 if succeeds, -1 otherwise.
*/
int
get_sebxa_indexes(const char *file_name, int index_page, off_t *index_location,
off_t *index_base, off_t *zio_start_location, off_t *zio_end_location)
{
char buffer[EB_SIZE_PAGE];
int file = -1;
int index_count;
char *index_p;
ssize_t done_length;
ssize_t n;
int page;
int page_count;
int i;
*index_location = 0;
*index_base = 0;
*zio_start_location = 0;
*zio_end_location = 0;
if (index_page == 0)
index_page = 1;
/*
* Open the file.
*/
file = open(file_name, O_RDONLY | O_BINARY);
if (file < 0) {
fprintf(stderr, _("%s: failed to open the file, %s: %s\n"),
invoked_name, strerror(errno), file_name);
goto failed;
}
/*
* Read index page.
*/
if (lseek(file, (index_page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
fprintf(stderr, _("%s: failed to seek the file, %s: %s\n"),
invoked_name, strerror(errno), file_name);
goto failed;
}
done_length = 0;
while (done_length < EB_SIZE_PAGE) {
errno = 0;
n = read(file, buffer + done_length, EB_SIZE_PAGE - done_length);
if (n < 0) {
if (errno == EINTR)
continue;
fprintf(stderr, _("%s: failed to read the file, %s: %s\n"),
invoked_name, strerror(errno), file_name);
goto failed;
} else if (n == 0) {
fprintf(stderr, _("%s: unexpected EOF: %s\n"),
invoked_name, file_name);
goto failed;
} else {
done_length += n;
}
}
/*
* Get information in index 0x21 and 0x22.
* They has comression information.
*/
index_count = *(unsigned char *)(buffer + 1);
index_p = buffer + 16;
for (i = 0; i < index_count; i++, index_p += 16) {
page = zio_uint4(index_p + 2);
page_count = zio_uint4(index_p + 6);
switch (*index_p) {
case 0x00:
*zio_start_location = (page - 1) * EB_SIZE_PAGE;
*zio_end_location = (page + page_count - 1) * EB_SIZE_PAGE - 1;
break;
case 0x21:
*index_base = (page - 1) * EB_SIZE_PAGE;
break;
case 0x22:
*index_location = (page - 1) * EB_SIZE_PAGE;
break;
}
}
close(file);
return 0;
failed:
if (0 <= file)
close(file);
fputc('\n', stderr);
return -1;
}
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