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🔧 将填充长短目录项的代码单独提取出来

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fslongjin
2022-07-06 19:53:50 +08:00
parent 440b3c917f
commit fc3fbf7acc
3 changed files with 124 additions and 76 deletions
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92
kernel/filesystem/fat32/fat_ent.c
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@ -302,4 +302,96 @@ bool fat32_check_char_available_in_short_name(const char c, int index)
return false;
}
return true;
}
/**
* @brief 填充短目录项的函数
*
* @param dEntry 目标dentry
* @param target 目标dentry对应的短目录项
* @param cluster 短目录项对应的文件/文件夹起始簇
*/
void fat32_fill_shortname(struct vfs_dir_entry_t *dEntry, struct fat32_Directory_t *target, uint32_t cluster)
{
memset(target, 0, sizeof(struct fat32_Directory_t));
{
int tmp_index = 0;
// kdebug("dEntry->name_length=%d", dEntry->name_length);
for (tmp_index = 0; tmp_index < min(8, dEntry->name_length); ++tmp_index)
{
if (dEntry->name[tmp_index] == '.')
break;
if (fat32_check_char_available_in_short_name(dEntry->name[tmp_index], tmp_index))
target->DIR_Name[tmp_index] = dEntry->name[tmp_index];
else
target->DIR_Name[tmp_index] = 0x20;
}
// 不满的部分使用0x20填充
while (tmp_index < 11)
{
// kdebug("tmp index = %d", tmp_index);
dEntry->name[tmp_index] = 0x20;
++tmp_index;
}
}
struct vfs_index_node_t *inode = dEntry->dir_inode;
target->DIR_Attr = 0;
if (inode->attribute & VFS_ATTR_DIR)
target->DIR_Attr |= ATTR_DIRECTORY;
target->DIR_FileSize = dEntry->dir_inode->file_size;
target->DIR_FstClusHI = (uint16_t)((cluster >> 16) & 0x0fff);
target->DIR_FstClusLO = (uint16_t)(cluster & 0xffff);
// todo: 填写短目录项中的时间信息
}
/**
* @brief 填充长目录项的函数
*
* @param dEntry 目标dentry
* @param target 起始长目录项
* @param checksum 短目录项的校验和
* @param cnt_longname 总的长目录项的个数
*/
void fat32_fill_longname(struct vfs_dir_entry_t *dEntry, struct fat32_LongDirectory_t *target, uint8_t checksum, uint32_t cnt_longname)
{
uint32_t current_name_index = 0;
struct fat32_LongDirectory_t *Ldentry = (struct fat32_LongDirectory_t *)(target+1);
for (int i = 1; i <= cnt_longname; ++i)
{
--Ldentry;
Ldentry->LDIR_Ord = i;
for (int j = 0; j < 5; ++j, ++current_name_index)
{
if (current_name_index < dEntry->name_length)
Ldentry->LDIR_Name1[j] = dEntry->name[current_name_index];
else
Ldentry->LDIR_Name1[j] = 0xffff;
}
for (int j = 0; j < 6; ++j, ++current_name_index)
{
if (current_name_index < dEntry->name_length)
Ldentry->LDIR_Name2[j] = dEntry->name[current_name_index];
else
Ldentry->LDIR_Name2[j] = 0xffff;
}
for (int j = 0; j < 2; ++j, ++current_name_index)
{
if (current_name_index < dEntry->name_length)
Ldentry->LDIR_Name3[j] = dEntry->name[current_name_index];
else
Ldentry->LDIR_Name3[j] = 0xffff;
}
Ldentry->LDIR_Attr = ATTR_LONG_NAME;
Ldentry->LDIR_FstClusLO = 0;
Ldentry->LDIR_Type = 0;
Ldentry->LDIR_Chksum = checksum;
}
// 最后一个长目录项的ord要|=0x40
Ldentry->LDIR_Ord |= 0x40;
}