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/*
* blank.c
* Detection of Blank Disk (Formatted)
*
* Written By Aaron Geyer of StorageQuest, Inc.
*
* Copyright (c) 2003 Aaron Geyer
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include "global.h"
/* The principle used to determine whether or not a disk
is blank is to search the disk for a byte code that
does not change over the disk. This module only scans the first
2MB of the disk. This module will need more work. */
#define BLOCK_SIZE (512)
#define MAX_BLOCKS (2048*2)
#define MIN_BLOCKS (64*2)
void detect_blank(SECTION *section, int level)
{
unsigned char *buffer;
int i, j;
int block_size = BLOCK_SIZE;
int max_blocks = MAX_BLOCKS;
int blank_blocks = 0;
unsigned char code;
char s[256];
if (get_buffer(section, 0, 1, (void **)&buffer) < 1)
return;
code = buffer[0];
/* Limit to actual size of partition / disk */
if (section->size && section->size < max_blocks * block_size) {
max_blocks = section->size / block_size;
}
/* Determine number of blank blocks */
for (i = 0; i < max_blocks; i++) {
if (get_buffer(section, i * block_size, block_size, (void **)&buffer) < block_size)
break;
for (j = 0; j < block_size; j++) {
if (buffer[j] != code)
break;
}
if (j < block_size)
break;
blank_blocks = i + 1;
}
if (blank_blocks >= max_blocks) {
print_line(level, "Blank disk/medium");
} else if (blank_blocks > MIN_BLOCKS) {
format_size(s, blank_blocks * block_size);
print_line(level, "First %s are blank", s);
}
}
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