EMILE/libemile/emile_floppy_create_image.c

234 lines
4.3 KiB
C

static __attribute__((used)) char* rcsid = "$CVSHeader$";
/*
*
* (c) 2004 Laurent Vivier <Laurent@lvivier.info>
*
*/
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "libemile.h"
#include "emile.h"
#include "bootblock.h"
static ssize_t copy_file(int fd, char* file)
{
int source;
ssize_t size_read;
ssize_t size_written;
ssize_t total;
static char buffer[FLOPPY_SECTOR_SIZE];
source = open(file, O_RDONLY);
if (source < 0)
{
close(source);
return EEMILE_CANNOT_OPEN_FILE;
}
total = 0;
for(;;)
{
size_read = read(source, buffer, FLOPPY_SECTOR_SIZE);
if (size_read == FLOPPY_SECTOR_SIZE)
{
size_written = write(fd, buffer, FLOPPY_SECTOR_SIZE);
total += size_written;
if (size_written != FLOPPY_SECTOR_SIZE)
{
close(source);
return -1;
}
}
else
{
if (size_read == 0)
break;
memset(buffer + size_read, 0, FLOPPY_SECTOR_SIZE - size_read);
size_written = write(fd, buffer, FLOPPY_SECTOR_SIZE);
total += size_written;
if (size_written != FLOPPY_SECTOR_SIZE)
{
close(source);
return -1;
}
break;
}
}
close(source);
return total;
}
static ssize_t pad_image(int fd, ssize_t size)
{
static char buffer[FLOPPY_SECTOR_SIZE];
ssize_t size_written;
ssize_t total;
if (size % FLOPPY_SECTOR_SIZE) {
fprintf(stderr,
"WARNING: pad size is not a multiple of sector size\n");
}
memset(buffer, 0, FLOPPY_SECTOR_SIZE);
total = 0;
while (size > 0) {
size_written = write(fd, buffer, FLOPPY_SECTOR_SIZE);
total += size_written;
if (size_written != FLOPPY_SECTOR_SIZE) {
return total;
}
size -= size_written;
}
return total;
}
int emile_is_url(char *path)
{
return path && ((strncmp(path, "iso9660:", strlen("iso9660:")) == 0) ||
(strncmp(path, "container:", strlen("container:")) == 0) ||
(strncmp(path, "block:", strlen("block:")) == 0) ||
(strncmp(path, "ext2:", strlen("ext2")) == 0));
}
int emile_floppy_create(char *image, char* first_level, char* second_level)
{
int fd;
off_t offset;
ssize_t size;
int ret;
if (first_level == NULL)
{
close(fd);
return EEMILE_MISSING_FIRST;
}
if (second_level == NULL)
{
close(fd);
return EEMILE_MISSING_SECOND;
}
fd = open(image, O_RDWR|O_CREAT|O_TRUNC,
S_IRUSR| S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
if (fd == -1)
return EEMILE_CANNOT_CREATE_IMAGE;
size = copy_file(fd, first_level);
if (size < 0)
return EEMILE_CANNOT_WRITE_FIRST;
size = copy_file(fd, second_level);
if (size < 0)
return EEMILE_CANNOT_WRITE_SECOND;
/* set first level info */
offset = lseek(fd, 0, SEEK_SET);
ret = emile_first_set_param(fd, EMILE_FIRST_TUNE_DRIVE |
EMILE_FIRST_TUNE_OFFSET|
EMILE_FIRST_TUNE_SIZE,
1, FIRST_LEVEL_SIZE,
emile_file_get_size(second_level));
if (ret != 0)
{
close(fd);
return ret;
}
lseek(fd, offset, SEEK_SET);
return fd;
}
char* emile_floppy_add(int fd, char *image)
{
off_t offset;
ssize_t size;
char buf[64];
lseek(fd, 0, SEEK_END);
offset = lseek(fd, 0, SEEK_CUR);
if (offset == (off_t)-1)
return NULL;
size = copy_file(fd, image);
if (size == -1)
return NULL;
sprintf(buf, "block:(fd0)0x%lx,0x%zx", offset, size);
return strdup(buf);
}
int emile_floppy_close(int fd)
{
int ret;
off_t offset;
lseek(fd, 0, SEEK_END);
offset = lseek(fd, 0, SEEK_CUR);
ret = pad_image(fd, 1474560 - offset);
if (ret < 0)
return EEMILE_CANNOT_WRITE_PAD;
close(fd);
return 0;
}
int emile_floppy_create_image(char* first_level, char* second_level,
char* kernel_image, char* ramdisk,
char* image)
{
int ret;
int fd;
char *kernel_url = NULL;
char *ramdisk_url = NULL;
if (image == NULL)
return -1;
if (kernel_image == NULL) {
fprintf(stderr, "ERROR: kernel image file not defined\n");
return -1;
}
fd = emile_floppy_create(image, first_level, second_level);
if (fd == -1)
return -1;
if ( emile_is_url(kernel_image) )
kernel_url = strdup(kernel_image);
else
kernel_url = emile_floppy_add(fd, kernel_image);
if ( ramdisk && emile_is_url(ramdisk) )
ramdisk_url = strdup(ramdisk);
else if (ramdisk)
ramdisk_url = emile_floppy_add(fd, ramdisk);
/* set second level info */
ret = emile_second_set_param(fd, kernel_url, NULL, ramdisk_url);
emile_floppy_close(fd);
free(kernel_url);
free(ramdisk_url);
return ret;
}