forked from KolibriOS/kolibrios
817 lines
27 KiB
PHP
817 lines
27 KiB
PHP
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2010. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;; 23.01.2010 turbanoff - read from ext2fs ;;
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;; ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision$
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EXT2_BAD_INO = 1
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EXT2_ROOT_INO = 2
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EXT2_ACL_IDX_INO = 3
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EXT2_ACL_DATA_INO = 4
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EXT2_BOOT_LOADER_INO= 5
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EXT2_UNDEL_DIR_INO = 6
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;type inode
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EXT2_S_IFREG = 0x8000
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EXT2_S_IFDIR = 0x4000
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;user inode right's
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EXT2_S_IRUSR = 0x0100
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EXT2_S_IWUSR = 0x0080
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EXT2_S_IXUSR = 0x0040
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;group inode right's
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EXT2_S_IRGRP = 0x0020
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EXT2_S_IWGRP = 0x0010
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EXT2_S_IXGRP = 0x0008
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;other inode right's
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EXT2_S_IROTH = 0x0004
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EXT2_S_IROTH = 0x0002
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EXT2_S_IROTH = 0x0001
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EXT2_FT_REG_FILE = 1 ;это файл, запись в родительском каталоге
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EXT2_FT_DIR = 2 ;это папка
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FS_FT_DIR = 0x10 ;это папка
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FS_FT_ASCII = 0 ;имя в ascii
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FS_FT_UNICODE = 1 ;имя в unicode
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struct EXT2_INODE_STRUC
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.i_mode dw ?
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.i_uid dw ?
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.i_size dd ?
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.i_atime dd ?
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.i_ctime dd ?
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.i_mtime dd ?
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.i_dtime dd ?
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.i_gid dw ?
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.i_links_count dw ?
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.i_blocks dd ?
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.i_flags dd ?
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.i_osd1 dd ?
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.i_block dd 15 dup ?
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.i_generation dd ?
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.i_file_acl dd ?
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.i_dir_acl dd ?
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.i_faddr dd ?
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.i_osd2 dd ? ; 1..12
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ends
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struct EXT2_DIR_STRUC
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.inode dd ?
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.rec_len dw ?
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.name_len db ?
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.file_type db ?
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.name db ? ; 0..255
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ends
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ext2_test_superblock:
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mov eax, [PARTITION_START]
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add eax, 2 ;superblock start at 1024b
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call hd_read
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cmp [fs_type], 0x83
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jne .no
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cmp dword [ebx+24], 3 ;s_block_size 0,1,2,3
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ja .no
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cmp word [ebx+56], 0xEF53 ;s_magic
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jne .no
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cmp word [ebx+58], 1 ;s_state (EXT_VALID_FS=1)
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jne .no
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; OK, this is correct EXT2 superblock
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clc
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ret
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.no:
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; No, this superblock isn't EXT2
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stc
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ret
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ext2_setup:
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mov [fs_type], 2
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mov ecx, [ebx+24]
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inc ecx
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mov [ext2_data.log_block_size], ecx ; 1, 2, 3, 4 equ 1kb, 2kb, 4kb, 8kb
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mov eax, 1
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shl eax, cl
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mov [ext2_data.count_block_in_block], eax
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shl eax, 7
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mov [ext2_data.count_pointer_in_block], eax
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mov edx, eax ; потом еще квадрат найдем
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shl eax, 2
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mov [ext2_data.block_size], eax
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push eax eax eax ;3 kernel_alloc
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mov eax, edx
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mul edx
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mov [ext2_data.count_pointer_in_block_square], eax
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call kernel_alloc
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mov [ext2_data.global_desc_table],eax ;reserve mem for gdt
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call kernel_alloc
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mov [ext2_data.ext2_save_block], eax ; and for temp block
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call kernel_alloc
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mov [ext2_data.ext2_temp_block], eax ; and for get_inode proc
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mov ebp, [ebx+88]
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mov ecx, [ebx+32]
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mov edx, [ebx+40]
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mov eax, [ebx+20] ; first_data_block
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mov [ext2_data.inode_size], ebp
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mov [ext2_data.blocks_per_group], ecx
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mov [ext2_data.inodes_per_group], edx
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mov ebx, [ext2_data.global_desc_table]
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inc eax ; first_data_block + 1 = gdt
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call ext2_get_block ; read gtd
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push ebp ebp ebp ;3 kernel_alloc
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call kernel_alloc
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mov [ext2_data.ext2_save_inode], eax
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call kernel_alloc
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mov [ext2_data.ext2_temp_inode], eax
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call kernel_alloc
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mov [ext2_data.root_inode], eax
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mov ebx, eax
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mov eax, EXT2_ROOT_INO
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call ext2_get_inode ; read root inode
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popad
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call free_hd_channel
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and [hd1_status], 0
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ret
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;==================================================================
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;in: eax = i_block
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; ebx = pointer to return memory
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ext2_get_block:
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push eax ebx ecx
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mov ecx, [ext2_data.log_block_size]
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shl eax, cl
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add eax, [PARTITION_START]
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mov ecx, [ext2_data.count_block_in_block]
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@@:
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call hd_read
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inc eax
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add ebx, 512
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loop @B
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pop ecx ebx eax
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ret
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;===================================================================
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; in: ecx = номер блока
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; ebp = адрес inode
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; out: ecx = адрес очередного блока
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ext2_get_inode_block:
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cmp ecx, 12
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jbe .get_direct_block
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sub ecx, 12
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cmp ecx, [ext2_data.count_pointer_in_block]
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jbe .get_indirect_block
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sub ecx, [ext2_data.count_pointer_in_block]
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cmp ecx, [ext2_data.count_pointer_in_block_square]
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jbe .get_double_indirect_block
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;.get_triple_indirect_block:
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push eax edx ebx
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mov eax, [ebx + EXT2_INODE_STRUC.i_block + 14*4]
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mov ebx, [ext2_data.ext2_temp_block]
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call ext2_get_block
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xor edx, edx
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mov eax, ecx
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div [ext2_data.count_pointer_in_block_square]
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;eax - номер в полученном блоке edx - номер дальше
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mov eax, [ebx + eax*4]
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call ext2_get_block
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mov eax, edx
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jmp @F
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.get_double_indirect_block:
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push eax edx ebx
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mov eax, [ebp + EXT2_INODE_STRUC.i_block + 13*4]
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mov ebx, [ext2_data.ext2_temp_block]
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call ext2_get_block
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mov eax, ecx
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@@:
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xor edx, edx
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div [ext2_data.count_pointer_in_block]
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mov eax, [ebx + eax*4]
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call ext2_get_block
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mov ecx, [ebx + edx*4]
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pop ebx edx eax
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ret
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.get_indirect_block:
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push eax ebx
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mov eax, [ebp + EXT2_INODE_STRUC.i_block + 12*4]
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mov ebx, [ext2_data.ext2_temp_block]
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call ext2_get_block
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mov ecx, [ebx + ecx*4]
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pop ebx eax
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ret
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.get_direct_block:
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mov ecx, dword [ebp + EXT2_INODE_STRUC.i_block + ecx*4]
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ret
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;===================================================================
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;get content inode by num
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;in: eax = inode_num
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; ebx = address of inode content
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ext2_get_inode:
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pushad
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mov edi, ebx ;сохраним адрес inode
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dec eax
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xor edx, edx
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div [ext2_data.inodes_per_group]
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push edx ;locale num
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mov edx, 32
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mul edx ; address block_group in global_desc_table
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add eax, [ext2_data.global_desc_table]
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mov eax, [eax+8] ; номер блока - в терминах ext2
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mov ecx, [ext2_data.log_block_size]
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shl eax, cl
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add eax, [PARTITION_START] ; а старт раздела - в терминах hdd (512)
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;eax - указывает на таблицу inode-ов на hdd
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mov ecx, eax ;сохраним его пока в ecx
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; прибавим локальный адрес inode-а
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pop eax ; index
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mul [ext2_data.inode_size] ; (index * inode_size)
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mov ebp, 512
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div ebp ;поделим на размер блока
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add eax, ecx ;нашли адрес блока для чтения
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mov ebx, [ext2_data.ext2_temp_block]
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call hd_read
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mov esi, edx ;добавим "остаток"
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add esi, ebx ;к адресу
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mov ecx, [ext2_data.inode_size]
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rep movsb ;копируем inode
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popad
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ret
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;----------------------------------------------------------------
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ext2_upcase:
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cmp al, 'a'
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jb .ret
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cmp al, 'z'
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ja .ret
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and al, 0xDF ; upcase = clear 0010 0000
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.ret:
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ret
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;----------------------------------------------------------------
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; in: esi -> children
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; ebx -> pointer to dir block
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; out: esi -> name without parent or not_changed
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; ebx -> dir_rec of inode children or trash
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ext2_test_block_by_name:
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push eax ecx edx edi
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mov edx, ebx
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add edx, [ext2_data.block_size] ;запомним конец блока
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.start_rec:
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cmp [ebx + EXT2_DIR_STRUC.inode], 0
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jz .next_rec
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; test [ebx + EXT2_DIR_STRUC.file_type], EXT2_FT_DIR
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; jz .next_rec
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push esi
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movzx ecx, [ebx + EXT2_DIR_STRUC.name_len]
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lea edi, [ebx + EXT2_DIR_STRUC.name]
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inc ecx
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@@:
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dec ecx
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jecxz .test_find
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lodsb
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mov ah, [edi]
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inc edi
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call ext2_upcase
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xchg al, ah
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call ext2_upcase
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cmp al, ah
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je @B
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@@: ;не подошло
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pop esi
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.next_rec:
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movzx eax, [ebx + EXT2_DIR_STRUC.rec_len]
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add ebx, eax ;к след. записи
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cmp ebx, edx ;проверим конец ли
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jne .start_rec
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jmp .ret
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.test_find:
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cmp byte [esi], 0
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je .find ;нашли конец
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cmp byte [esi], '/'
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jne @B
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inc esi
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.find:
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pop eax ;удаляем из стека сохраненое значение
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; mov ebx, [ebx + EXT2_DIR_STRUC.inode]
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.ret:
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pop edi edx ecx eax
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ret
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;----------------------------------------------------------------
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;
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; ext2_HdReadFolder - read disk folder
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;
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; esi points to filename
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; ebx pointer to structure 32-bit number = first wanted block, 0+
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; & flags (bitfields)
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; flags: bit 0: 0=ANSI names, 1=UNICODE names
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; ecx number of blocks to read, 0+
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; edx mem location to return data
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;
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; ret ebx = blocks read or 0xffffffff folder not found
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; eax = 0 ok read or other = errormsg
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;
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|||
|
|
;--------------------------------------------------------------
|
|||
|
|
uglobal
|
|||
|
|
EXT2_files_in_folder dd ? ;всего файлов в папке
|
|||
|
|
EXT2_read_in_folder dd ? ;сколько файлов "считали"
|
|||
|
|
EXT2_end_block dd ? ;конец очередного блока папки
|
|||
|
|
EXT2_counter_blocks dd ?
|
|||
|
|
endg
|
|||
|
|
|
|||
|
|
ext2_HdReadFolder:
|
|||
|
|
mov ebp, [ext2_data.root_inode]
|
|||
|
|
mov [EXT2_read_in_folder], ebx
|
|||
|
|
mov [EXT2_files_in_folder], ecx ;сохраним регистры
|
|||
|
|
|
|||
|
|
.next_folder:
|
|||
|
|
cmp byte [esi], 0
|
|||
|
|
jz .get_folder
|
|||
|
|
|
|||
|
|
or [EXT2_counter_blocks], -1 ;счетчик блоков папки cur block of inode
|
|||
|
|
mov eax, [ebp + EXT2_INODE_STRUC.i_blocks] ;убывающий счетчик блоков
|
|||
|
|
add eax, [ext2_data.count_block_in_block]
|
|||
|
|
mov [EXT2_end_block], eax
|
|||
|
|
.next_block_folder:
|
|||
|
|
mov eax, [ext2_data.count_block_in_block]
|
|||
|
|
sub [EXT2_end_block], eax
|
|||
|
|
jz .not_found
|
|||
|
|
inc [EXT2_counter_blocks]
|
|||
|
|
mov ecx, [EXT2_counter_blocks]
|
|||
|
|
call ext2_get_inode_block
|
|||
|
|
|
|||
|
|
mov eax, ecx
|
|||
|
|
mov ebx, [ext2_data.ext2_save_block] ;ebx = cur dir record
|
|||
|
|
call ext2_get_block
|
|||
|
|
|
|||
|
|
mov eax, esi
|
|||
|
|
call ext2_test_block_by_name
|
|||
|
|
cmp eax, esi ;нашли имя?
|
|||
|
|
je .next_block_folder
|
|||
|
|
|
|||
|
|
cmp [ebx + EXT2_DIR_STRUC.file_type], EXT2_FT_DIR
|
|||
|
|
jne .not_found ;нашли, но это не папка
|
|||
|
|
mov eax, [ebx + EXT2_DIR_STRUC.inode]
|
|||
|
|
mov ebx, [ext2_data.ext2_save_inode] ;все же папка.
|
|||
|
|
call ext2_get_inode
|
|||
|
|
mov ebp, ebx
|
|||
|
|
jmp .next_folder
|
|||
|
|
|
|||
|
|
.not_found:
|
|||
|
|
or ebx, -1
|
|||
|
|
mov eax, ERROR_FILE_NOT_FOUND
|
|||
|
|
ret
|
|||
|
|
;--------------------------------------------- final step
|
|||
|
|
; in ebp - pointer to final inode (folder).
|
|||
|
|
.get_folder:
|
|||
|
|
push edx ;заголовок будем заполнять в конце (адрес - в стеке) edx
|
|||
|
|
push [EXT2_read_in_folder] ;сохраненный регистр тоже в стек
|
|||
|
|
|
|||
|
|
mov edi, [EXT2_files_in_folder] ;edi = число блоков для чтения
|
|||
|
|
and [EXT2_read_in_folder], 0
|
|||
|
|
and [EXT2_files_in_folder], 0
|
|||
|
|
|
|||
|
|
mov esi, [ebp + EXT2_INODE_STRUC.i_blocks]
|
|||
|
|
mov [EXT2_counter_blocks], esi
|
|||
|
|
|
|||
|
|
add edx, 32 ;заголовок будем заполнять в конце (адрес - в стеке) edx = current mem for return
|
|||
|
|
xor esi, esi ;esi = номер блока по порядку
|
|||
|
|
|
|||
|
|
.new_block_folder: ;reserved label
|
|||
|
|
mov ecx, esi ; получим номер блока
|
|||
|
|
call ext2_get_inode_block
|
|||
|
|
|
|||
|
|
mov eax, ecx
|
|||
|
|
mov ebx, [ext2_data.ext2_save_block]
|
|||
|
|
call ext2_get_block ; и считываем блок с hdd
|
|||
|
|
|
|||
|
|
mov eax, ebx ; eax = current dir record
|
|||
|
|
add ebx, [ext2_data.block_size]
|
|||
|
|
mov [EXT2_end_block], ebx ; запомним конец очередного блока
|
|||
|
|
|
|||
|
|
pop ecx
|
|||
|
|
mov ecx, [ecx] ; ecx = first wanted (flags ommited)
|
|||
|
|
|
|||
|
|
.find_wanted_start:
|
|||
|
|
jecxz .find_wanted_end
|
|||
|
|
.find_wanted_cycle:
|
|||
|
|
cmp [eax + EXT2_DIR_STRUC.inode], 0 ; if (inode = 0) => not used
|
|||
|
|
je @F
|
|||
|
|
inc [EXT2_files_in_folder]
|
|||
|
|
@@:
|
|||
|
|
movzx ebx, [eax+EXT2_DIR_STRUC.rec_len]
|
|||
|
|
add eax, ebx ; к следующей записи
|
|||
|
|
cmp eax, [EXT2_end_block] ; проверяем "конец"
|
|||
|
|
je .end_block_find_wanted
|
|||
|
|
loop .find_wanted_cycle
|
|||
|
|
.find_wanted_end:
|
|||
|
|
|
|||
|
|
mov ecx, edi
|
|||
|
|
.wanted_start: ; ищем first_wanted+count
|
|||
|
|
jecxz .wanted_end
|
|||
|
|
.wanted_cycle:
|
|||
|
|
cmp [eax + EXT2_DIR_STRUC.inode], 0 ; if (inode = 0) => not used
|
|||
|
|
jz .empty_rec
|
|||
|
|
inc [EXT2_files_in_folder]
|
|||
|
|
inc [EXT2_read_in_folder]
|
|||
|
|
|
|||
|
|
test [eax + EXT2_DIR_STRUC.file_type], EXT2_FT_DIR ;папка или нет
|
|||
|
|
jnz @F
|
|||
|
|
|
|||
|
|
push eax ;получим размер, если это файл
|
|||
|
|
mov eax, [eax + EXT2_DIR_STRUC.inode]
|
|||
|
|
mov ebx, [ext2_data.ext2_temp_inode]
|
|||
|
|
call ext2_get_inode
|
|||
|
|
mov eax, [ebx + EXT2_INODE_STRUC.i_size] ;low size
|
|||
|
|
mov ebx, [ebx + EXT2_INODE_STRUC.i_dir_acl] ;high size
|
|||
|
|
mov dword [edx+32], eax
|
|||
|
|
mov dword [edx+36], ebx
|
|||
|
|
xor dword [edx], FS_FT_DIR ; для файлов xor - 2 раза
|
|||
|
|
pop eax
|
|||
|
|
@@:
|
|||
|
|
xor dword [edx], FS_FT_DIR
|
|||
|
|
mov dword [edx+4], FS_FT_ASCII ; symbol type in name
|
|||
|
|
|
|||
|
|
push ecx esi ;copy name
|
|||
|
|
movzx ecx, [eax + EXT2_DIR_STRUC.name_len]
|
|||
|
|
mov edi, edx
|
|||
|
|
add edi, 40
|
|||
|
|
lea esi, [eax + EXT2_DIR_STRUC.name]
|
|||
|
|
rep movsb
|
|||
|
|
pop esi ecx
|
|||
|
|
and byte [edi], 0
|
|||
|
|
|
|||
|
|
add edx, 40 + 264 ; go to next record
|
|||
|
|
.empty_rec:
|
|||
|
|
movzx ebx, [eax + EXT2_DIR_STRUC.rec_len]
|
|||
|
|
add eax, ebx
|
|||
|
|
cmp eax, [EXT2_end_block]
|
|||
|
|
je .end_block_wanted
|
|||
|
|
loop .wanted_cycle
|
|||
|
|
|
|||
|
|
.wanted_end: ;теперь дойдем до конца чтобы узнать сколько файлов в папке
|
|||
|
|
or ecx, -1 ;цикл уже есть, просто поставим ему огромный счетчик
|
|||
|
|
jmp .find_wanted_cycle
|
|||
|
|
|
|||
|
|
.end_block_find_wanted: ;вылетили из цикла find_wanted
|
|||
|
|
mov ebx, [ext2_data.count_block_in_block]
|
|||
|
|
sub [EXT2_counter_blocks], ebx
|
|||
|
|
jz .end_dir
|
|||
|
|
|
|||
|
|
;получаем новый блок
|
|||
|
|
inc esi
|
|||
|
|
push ecx
|
|||
|
|
mov ecx, esi
|
|||
|
|
call ext2_get_inode_block
|
|||
|
|
mov eax, ecx
|
|||
|
|
mov ebx, [ext2_data.ext2_save_block]
|
|||
|
|
call ext2_get_block
|
|||
|
|
pop ecx
|
|||
|
|
dec ecx
|
|||
|
|
mov eax, ebx
|
|||
|
|
add ebx, [ext2_data.block_size]
|
|||
|
|
mov [EXT2_end_block], ebx
|
|||
|
|
jmp .find_wanted_start
|
|||
|
|
|
|||
|
|
.end_block_wanted: ;вылетели из цикла wanted
|
|||
|
|
mov ebx, [ext2_data.count_block_in_block]
|
|||
|
|
sub [EXT2_counter_blocks], ebx
|
|||
|
|
jz .end_dir
|
|||
|
|
|
|||
|
|
inc esi
|
|||
|
|
push ecx
|
|||
|
|
mov ecx, esi
|
|||
|
|
call ext2_get_inode_block
|
|||
|
|
mov eax, ecx
|
|||
|
|
mov ebx, [ext2_data.ext2_save_block]
|
|||
|
|
call ext2_get_block
|
|||
|
|
pop ecx
|
|||
|
|
dec ecx
|
|||
|
|
mov eax, ebx
|
|||
|
|
add ebx, [ext2_data.block_size]
|
|||
|
|
mov [EXT2_end_block], ebx
|
|||
|
|
jmp .wanted_start
|
|||
|
|
|
|||
|
|
.end_dir:
|
|||
|
|
pop edx
|
|||
|
|
mov ebx, [EXT2_read_in_folder]
|
|||
|
|
mov ecx, [EXT2_files_in_folder]
|
|||
|
|
mov dword [edx], 1 ;version
|
|||
|
|
xor eax, eax
|
|||
|
|
mov [edx+4], ebx
|
|||
|
|
mov [edx+8], ecx
|
|||
|
|
lea edi, [edx + 12]
|
|||
|
|
mov ecx, 20 / 4
|
|||
|
|
rep stosd
|
|||
|
|
ret
|
|||
|
|
;====================== end ext2_HdReadFolder
|
|||
|
|
|
|||
|
|
;----------------------------------------------------------------
|
|||
|
|
;
|
|||
|
|
; ext2_HdRead - read hard disk
|
|||
|
|
;
|
|||
|
|
; esi points to filename
|
|||
|
|
; ebx pointer to 64-bit number = first wanted byte, 0+
|
|||
|
|
; may be ebx=0 - start from first byte
|
|||
|
|
; ecx number of bytes to read, 0+
|
|||
|
|
; edx mem location to return data
|
|||
|
|
;
|
|||
|
|
; ret ebx = bytes read or 0xffffffff file not found
|
|||
|
|
; eax = 0 ok read or other = errormsg
|
|||
|
|
;
|
|||
|
|
;--------------------------------------------------------------
|
|||
|
|
ext2_HdRead:
|
|||
|
|
mov ebp, [ext2_data.root_inode]
|
|||
|
|
|
|||
|
|
push ecx edx ebx
|
|||
|
|
.next_folder:
|
|||
|
|
push esi
|
|||
|
|
@@:
|
|||
|
|
lodsb
|
|||
|
|
test al, al
|
|||
|
|
jz .find_end
|
|||
|
|
cmp al, '/'
|
|||
|
|
jz .find_folder
|
|||
|
|
jmp @B
|
|||
|
|
|
|||
|
|
.find_end:
|
|||
|
|
;установим флаг что ищем файл или очередную папку
|
|||
|
|
mov edi, 1
|
|||
|
|
jmp .find_any
|
|||
|
|
.find_folder:
|
|||
|
|
xor edi, edi
|
|||
|
|
.find_any:
|
|||
|
|
pop esi
|
|||
|
|
|
|||
|
|
cmp byte [esi], 0
|
|||
|
|
jz .not_found
|
|||
|
|
|
|||
|
|
or [EXT2_counter_blocks], -1 ;счетчик блоков папки cur block of inode
|
|||
|
|
mov eax, [ebp + EXT2_INODE_STRUC.i_blocks] ;убывающий счетчик блоков
|
|||
|
|
add eax, [ext2_data.count_block_in_block]
|
|||
|
|
mov [EXT2_end_block], eax
|
|||
|
|
.next_block_folder:
|
|||
|
|
mov eax, [ext2_data.count_block_in_block]
|
|||
|
|
sub [EXT2_end_block], eax
|
|||
|
|
jz .not_found
|
|||
|
|
inc [EXT2_counter_blocks]
|
|||
|
|
mov ecx, [EXT2_counter_blocks]
|
|||
|
|
call ext2_get_inode_block
|
|||
|
|
|
|||
|
|
mov eax, ecx
|
|||
|
|
mov ebx, [ext2_data.ext2_save_block] ;ebx = cur dir record
|
|||
|
|
call ext2_get_block
|
|||
|
|
|
|||
|
|
mov eax, esi
|
|||
|
|
call ext2_test_block_by_name
|
|||
|
|
cmp eax, esi ;нашли имя?
|
|||
|
|
je .next_block_folder
|
|||
|
|
|
|||
|
|
cmp [ebx + EXT2_DIR_STRUC.file_type], EXT2_FT_REG_FILE
|
|||
|
|
je .test_file
|
|||
|
|
cmp [ebx + EXT2_DIR_STRUC.file_type], EXT2_FT_DIR
|
|||
|
|
jne .not_found
|
|||
|
|
.test_dir:
|
|||
|
|
cmp edi, 0
|
|||
|
|
jne .this_is_folder
|
|||
|
|
|
|||
|
|
mov eax, [ebx + EXT2_DIR_STRUC.inode]
|
|||
|
|
mov ebx, [ext2_data.ext2_save_inode] ;все же папка.
|
|||
|
|
call ext2_get_inode
|
|||
|
|
mov ebp, ebx
|
|||
|
|
jmp .next_folder
|
|||
|
|
|
|||
|
|
.test_file:
|
|||
|
|
cmp edi, 0
|
|||
|
|
je .not_found
|
|||
|
|
|
|||
|
|
mov eax, [ebx + EXT2_DIR_STRUC.inode]
|
|||
|
|
mov ebx, [ext2_data.ext2_save_inode]
|
|||
|
|
call ext2_get_inode
|
|||
|
|
jmp .get_file
|
|||
|
|
|
|||
|
|
.not_found:
|
|||
|
|
pop edx ecx ebx
|
|||
|
|
or ebx, -1
|
|||
|
|
mov eax, ERROR_FILE_NOT_FOUND
|
|||
|
|
ret
|
|||
|
|
.this_is_folder:
|
|||
|
|
pop edx ecx ebx
|
|||
|
|
or ebx, -1
|
|||
|
|
mov eax, ERROR_ACCESS_DENIED
|
|||
|
|
.end_read:
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
;-----------------------------------------------------------------------------final step
|
|||
|
|
.get_file:
|
|||
|
|
xchg bx, bx
|
|||
|
|
mov ebp ,ebx
|
|||
|
|
|
|||
|
|
;pop eax edi ecx ; первый_блок память кол-во_байт
|
|||
|
|
mov esi, [esp]
|
|||
|
|
mov edi, [esp + 8] ;edi = нужно считать байт
|
|||
|
|
|
|||
|
|
;///// сравним хватит ли нам файла или нет
|
|||
|
|
mov ebx, [esi+4]
|
|||
|
|
mov eax, [esi] ; ebx : eax - стартовый номер байта
|
|||
|
|
|
|||
|
|
mov edx, [ebp + EXT2_INODE_STRUC.i_dir_acl]
|
|||
|
|
mov ecx, [ebp + EXT2_INODE_STRUC.i_size] ;edx : ecx - размер файла
|
|||
|
|
|
|||
|
|
cmp edx, ebx
|
|||
|
|
ja .size_great
|
|||
|
|
jb .size_less
|
|||
|
|
|
|||
|
|
cmp ecx, eax
|
|||
|
|
ja .size_great
|
|||
|
|
|
|||
|
|
.size_less:
|
|||
|
|
add esp, 12
|
|||
|
|
mov ebx, 0
|
|||
|
|
mov eax, 6 ;EOF
|
|||
|
|
ret
|
|||
|
|
.size_great:
|
|||
|
|
;прибавим к старту кол-во байт для чтения
|
|||
|
|
add eax, edi
|
|||
|
|
jnc @F
|
|||
|
|
inc ebx
|
|||
|
|
@@:
|
|||
|
|
cmp edx, ebx
|
|||
|
|
ja .size_great_great
|
|||
|
|
jb .size_great_less
|
|||
|
|
cmp ecx, eax
|
|||
|
|
jae .size_great_great
|
|||
|
|
;jmp .size_great_less
|
|||
|
|
; а если равно, то не важно куда
|
|||
|
|
.size_great_less:
|
|||
|
|
or [EXT2_files_in_folder], 1 ;читаем по границе размера
|
|||
|
|
sub ecx, [esi]
|
|||
|
|
pop eax edi edx ;ecx - не меняем
|
|||
|
|
jmp @F
|
|||
|
|
|
|||
|
|
.size_great_great:
|
|||
|
|
and [EXT2_files_in_folder], 0 ;читаем нормально
|
|||
|
|
pop eax edi ecx
|
|||
|
|
|
|||
|
|
@@:
|
|||
|
|
push ecx ;сохраним размер считанных байт в стеке
|
|||
|
|
test eax, eax
|
|||
|
|
je .zero_start
|
|||
|
|
|
|||
|
|
;пока делаем п..ц криво =)
|
|||
|
|
mov edx, [eax+4]
|
|||
|
|
mov eax, [eax]
|
|||
|
|
div [ext2_data.block_size]
|
|||
|
|
|
|||
|
|
mov [EXT2_counter_blocks], eax ;номер блока запоминаем
|
|||
|
|
|
|||
|
|
push ecx
|
|||
|
|
mov ecx, eax
|
|||
|
|
call ext2_get_inode_block
|
|||
|
|
mov ebx , [ext2_data.ext2_save_block]
|
|||
|
|
mov eax, ecx
|
|||
|
|
call ext2_get_block
|
|||
|
|
pop ecx
|
|||
|
|
add ebx, edx
|
|||
|
|
|
|||
|
|
neg edx
|
|||
|
|
add edx,[ext2_data.block_size] ;block_size - стартоый блок = сколько байт 1-го блока
|
|||
|
|
cmp ecx, edx
|
|||
|
|
jbe .only_one_block
|
|||
|
|
|
|||
|
|
mov eax, ecx
|
|||
|
|
sub eax, edx
|
|||
|
|
mov ecx, edx
|
|||
|
|
|
|||
|
|
mov esi, ebx
|
|||
|
|
rep movsb ;кусок 1-го блока
|
|||
|
|
|
|||
|
|
.zero_start:
|
|||
|
|
mov ebx, edi ;чтение блока прям в ebx
|
|||
|
|
;теперь в eax кол-во оставшихся байт для чтения
|
|||
|
|
xor edx, edx
|
|||
|
|
div [ext2_data.block_size]
|
|||
|
|
mov [EXT2_end_block], eax ;кол-во целых блоков
|
|||
|
|
@@:
|
|||
|
|
cmp [EXT2_end_block], 0
|
|||
|
|
jz .finish_block
|
|||
|
|
inc [EXT2_counter_blocks]
|
|||
|
|
mov ecx, [EXT2_counter_blocks]
|
|||
|
|
call ext2_get_inode_block
|
|||
|
|
|
|||
|
|
mov eax, ecx ;а ebx уже забит нужным значением
|
|||
|
|
call ext2_get_block
|
|||
|
|
add ebx, [ext2_data.block_size]
|
|||
|
|
|
|||
|
|
dec [EXT2_end_block]
|
|||
|
|
jmp @B
|
|||
|
|
|
|||
|
|
.finish_block: ;в edx - кол-во байт в последнем блоке
|
|||
|
|
cmp edx, 0
|
|||
|
|
je .end_read
|
|||
|
|
|
|||
|
|
mov ecx, [EXT2_counter_blocks]
|
|||
|
|
inc ecx
|
|||
|
|
call ext2_get_inode_block
|
|||
|
|
|
|||
|
|
mov edi, ebx
|
|||
|
|
mov eax, ecx
|
|||
|
|
mov ebx, [ext2_data.ext2_save_block]
|
|||
|
|
call ext2_get_block
|
|||
|
|
|
|||
|
|
mov ecx, edx
|
|||
|
|
|
|||
|
|
.only_one_block:
|
|||
|
|
mov esi, ebx
|
|||
|
|
rep movsb ;кусок 1-го блока (последнего)
|
|||
|
|
pop ebx
|
|||
|
|
cmp [EXT2_files_in_folder], 0
|
|||
|
|
jz @F
|
|||
|
|
|
|||
|
|
mov eax, 6 ;EOF
|
|||
|
|
ret
|
|||
|
|
@@:
|
|||
|
|
xor eax, eax
|
|||
|
|
ret
|
|||
|
|
;========================
|
|||
|
|
|
|||
|
|
ext2_HdRewrite:
|
|||
|
|
; xchg bx, bx
|
|||
|
|
xor ebx, ebx
|
|||
|
|
mov eax, ERROR_UNSUPPORTED_FS
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
ext2_HdWrite:
|
|||
|
|
; xchg bx, bx
|
|||
|
|
xor ebx, ebx
|
|||
|
|
mov eax, ERROR_UNSUPPORTED_FS
|
|||
|
|
ret
|
|||
|
|
ext2_HdSetFileEnd:
|
|||
|
|
; xchg bx, bx
|
|||
|
|
xor ebx, ebx
|
|||
|
|
mov eax, ERROR_UNSUPPORTED_FS
|
|||
|
|
ret
|
|||
|
|
ext2_HdGetFileInfo:
|
|||
|
|
; xchg bx, bx
|
|||
|
|
xor ebx, ebx
|
|||
|
|
mov eax, ERROR_UNSUPPORTED_FS
|
|||
|
|
ret
|
|||
|
|
ext2_HdSetFileInfo:
|
|||
|
|
; xchg bx, bx
|
|||
|
|
xor ebx, ebx
|
|||
|
|
mov eax, ERROR_UNSUPPORTED_FS
|
|||
|
|
ret
|
|||
|
|
ext2_HdDelete:
|
|||
|
|
; xchg bx, bx
|
|||
|
|
xor ebx, ebx
|
|||
|
|
mov eax, ERROR_UNSUPPORTED_FS
|
|||
|
|
ret
|
|||
|
|
|