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69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
/*
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* PROJECT: Mke2fs
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* FILE: Group.c
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* PROGRAMMER: Matt Wu <mattwu@163.com>
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* HOMEPAGE: http://ext2.yeah.net
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*/
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/* INCLUDES **************************************************************/
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#include "Mke2fs.h"
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/* DEFINITIONS ***********************************************************/
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/* FUNCTIONS *************************************************************/
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int test_root(int a, int b)
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{
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if (a == 0)
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return 1;
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while (1)
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{
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if (a == 1)
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return 1;
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if (a % b)
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return 0;
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a = a / b;
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}
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}
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bool ext2_bg_has_super(PEXT2_SUPER_BLOCK pExt2Sb, int group_block)
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{
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if (!(pExt2Sb->s_feature_ro_compat & EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))
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return true;
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if (test_root(group_block, 3) || (test_root(group_block, 5)) ||
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test_root(group_block, 7))
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return true;
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return false;
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}
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bool ext2_allocate_group_desc(PEXT2_FILESYS Ext2Sys)
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{
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ULONG size;
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size = Ext2Sys->desc_blocks * Ext2Sys->blocksize;
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Ext2Sys->group_desc =
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(PEXT2_GROUP_DESC)RtlAllocateHeap(RtlGetProcessHeap(), 0, size);
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if (Ext2Sys->group_desc)
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{
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memset(Ext2Sys->group_desc, 0, size);
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return true;
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}
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return false;
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}
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void ext2_free_group_desc(PEXT2_FILESYS Ext2Sys)
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{
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if (Ext2Sys->group_desc)
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{
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RtlFreeHeap(RtlGetProcessHeap(), 0, Ext2Sys->group_desc);
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Ext2Sys->group_desc = NULL;
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}
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}
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