[2] | 1 | ; Project name : File library |
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[162] | 2 | ; Description : ASM library for DOS file handling. |
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[2] | 3 | |
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| 4 | ;--------------- Equates ----------------------------- |
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| 5 | |
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| 6 | ; DOS DTA (Disk Transfer Area) |
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| 7 | struc DTA |
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| 8 | ; Undocumented fields |
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| 9 | .reserved resb 21 |
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| 10 | ; Documented fields |
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| 11 | .bFileAttr resb 1 ; 15h, Attribute of matching file |
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| 12 | .wFileTime resb 2 ; 16h, File time |
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| 13 | .wFileDate resb 2 ; 18h, File date |
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| 14 | .dwFileSize resb 4 ; 1Ah, File size in bytes |
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| 15 | .szFile resb 13 ; 1Eh, ASCIZ filename + extension |
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| 16 | endstruc |
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| 17 | |
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| 18 | ; Bits for file attribute byte |
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| 19 | FLG_FATTR_RDONLY EQU (1<<0) ; Read only |
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| 20 | FLG_FATTR_HIDDEN EQU (1<<1) ; Hidden |
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| 21 | FLG_FATTR_SYS EQU (1<<2) ; System |
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| 22 | FLG_FATTR_LABEL EQU (1<<3) ; Volume Label |
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| 23 | FLG_FATTR_DIR EQU (1<<4) ; Directory |
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| 24 | FLG_FATTR_ARCH EQU (1<<5) ; Archive |
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| 25 | |
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| 26 | ; File access and sharing modes |
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| 27 | VAL_FACCS_READ EQU 0 ; Read only |
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| 28 | VAL_FACCS_WRITE EQU 1 ; Write only |
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| 29 | VAL_FACCS_RW EQU 2 ; Read and Write |
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| 30 | |
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| 31 | ; DOS File I/O error codes |
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| 32 | ERR_DOS_SUCCESS EQU 0 ; No error |
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| 33 | ERR_DOS_FUNC EQU 1 ; Function number invalid |
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| 34 | ERR_DOS_NOFILE EQU 2 ; File not found |
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| 35 | ERR_DOS_NOPATH EQU 3 ; Path not found |
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| 36 | ERR_DOS_TOOMANY EQU 4 ; Too many open files |
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| 37 | ERR_DOS_DENIED EQU 5 ; Access denied |
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| 38 | ERR_DOS_HANDLE EQU 6 ; Invalid handle |
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| 39 | ERR_DOS_CODE EQU 12 ; Access code invalid |
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| 40 | ERR_DOS_NOMORE EQU 18 ; No more files |
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| 41 | |
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| 42 | |
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| 43 | ;-------------- Private global variables ------------- |
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| 44 | ; Section containing initialized data |
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| 45 | ;SECTION .data |
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| 46 | |
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| 47 | ; DOS file I/O related error strings |
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| 48 | g_szNoErr: db "No error",STOP |
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| 49 | g_szFunc: db "Function number invalid",STOP |
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| 50 | g_szNoFile: db "File not found",STOP |
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| 51 | g_szNoPath: db "Path not found",STOP |
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| 52 | g_szTooMany: db "Too many open files",STOP |
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| 53 | g_szDenied: db "Access denied",STOP |
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| 54 | g_szHandle: db "Invalid handle",STOP |
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| 55 | g_szCode: db "Access code invalid",STOP |
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| 56 | g_szNoMore: db "No more files",STOP |
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| 57 | g_szUnknown: db "Unknown file I/O error",STOP |
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| 58 | |
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| 59 | |
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| 60 | ;-------------- Public functions --------------------- |
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| 61 | ; Section containing code |
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| 62 | SECTION .text |
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| 63 | |
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| 64 | ;-------------------------------------------------------------------- |
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| 65 | ; Returns pointer to error string. |
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| 66 | ; Pointer is always valid, even if error code is not. |
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[162] | 67 | ; |
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[2] | 68 | ; File_GetErrStr |
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| 69 | ; Parameters: |
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| 70 | ; AX: DOS File I/O error code |
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| 71 | ; Returns: |
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| 72 | ; ES:DI: Ptr to error string |
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| 73 | ; Corrupts registers: |
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| 74 | ; Nothing |
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| 75 | ;-------------------------------------------------------------------- |
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| 76 | ALIGN JUMP_ALIGN |
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| 77 | File_GetErrStr: |
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| 78 | mov di, g_szNoMore ; Assume ERR_DOS_NOMORE |
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| 79 | cmp ax, ERR_DOS_NOMORE |
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| 80 | je .Return |
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| 81 | mov di, g_szCode ; Assume ERR_DOS_CODE |
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| 82 | cmp ax, ERR_DOS_CODE |
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| 83 | je .Return |
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| 84 | mov di, g_szUnknown ; Assume unknown error |
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| 85 | cmp ax, ERR_DOS_HANDLE ; Can use lookup? |
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| 86 | ja .Return ; If not, return |
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| 87 | mov di, ax ; Copy error code to DI |
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| 88 | shl di, 1 ; Shift for word lookup |
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| 89 | mov di, [cs:di+.rgwErrLookup] |
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| 90 | ALIGN JUMP_ALIGN |
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| 91 | .Return: |
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| 92 | push cs ; Copy CS... |
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| 93 | pop es ; ...to ES |
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| 94 | ret |
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| 95 | ALIGN WORD_ALIGN |
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| 96 | .rgwErrLookup: |
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| 97 | dw g_szNoErr ; 0 |
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| 98 | dw g_szFunc ; 1 |
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| 99 | dw g_szNoFile ; 2 |
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| 100 | dw g_szNoPath ; 3 |
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| 101 | dw g_szTooMany ; 4 |
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| 102 | dw g_szDenied ; 5 |
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| 103 | dw g_szHandle ; 6 |
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| 104 | |
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| 105 | |
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| 106 | ;-------------------------------------------------------------------- |
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| 107 | ; Opens file for reading and writing. |
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| 108 | ; File must be closed with File_Close when no longer needed. |
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[162] | 109 | ; |
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[2] | 110 | ; File_Open |
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| 111 | ; Parameters: |
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| 112 | ; AL: File access and sharing mode: |
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| 113 | ; VAL_FACCS_READ Open file for reading |
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| 114 | ; VAL_FACCS_WRITE Open file for writing |
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| 115 | ; VAL_FACCS_RW Open file for read and write |
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| 116 | ; DS:DX: Ptr to destination ASCIZ file name |
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| 117 | ; Returns: |
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| 118 | ; AX: DOS error code if CF set |
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| 119 | ; BX: File handle if CF cleared |
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| 120 | ; CF: Clear if file opened successfully |
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| 121 | ; Set if error |
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| 122 | ; Corrupts registers: |
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| 123 | ; AX, BX |
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| 124 | ;-------------------------------------------------------------------- |
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| 125 | ALIGN JUMP_ALIGN |
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| 126 | File_Open: |
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| 127 | mov ah, 3Dh ; Open Existing File |
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| 128 | int 21h |
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| 129 | mov bx, ax ; Copy handle to BX |
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| 130 | ret |
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| 131 | |
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| 132 | |
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| 133 | ;-------------------------------------------------------------------- |
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| 134 | ; Closes file. |
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[162] | 135 | ; |
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[2] | 136 | ; File_Close |
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| 137 | ; Parameters: |
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| 138 | ; BX: File handle |
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| 139 | ; Returns: |
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| 140 | ; AX: DOS error code if CF set |
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| 141 | ; CF: Clear if file closed successfully |
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| 142 | ; Set if error |
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| 143 | ; Corrupts registers: |
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| 144 | ; AX |
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| 145 | ;-------------------------------------------------------------------- |
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| 146 | ALIGN JUMP_ALIGN |
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| 147 | File_Close: |
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| 148 | mov ah, 3Eh ; Open Existing File |
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| 149 | int 21h |
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| 150 | ret |
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| 151 | |
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| 152 | |
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| 153 | ;-------------------------------------------------------------------- |
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| 154 | ; Reads binary data from file. |
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| 155 | ; File position is updated so next read will start where |
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| 156 | ; previous read stopped. |
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[162] | 157 | ; |
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[2] | 158 | ; File_Read |
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| 159 | ; Parameters: |
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| 160 | ; BX: File handle |
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| 161 | ; CX: Number of bytes to read |
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| 162 | ; ES:DI: Ptr to destination buffer |
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| 163 | ; Returns: |
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| 164 | ; AX: Number of bytes actually read if successfull (EOF check) |
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| 165 | ; DOS error code if CF set |
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| 166 | ; CF: Clear if successfull |
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| 167 | ; Set if error |
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| 168 | ; Corrupts registers: |
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| 169 | ; Nothing |
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| 170 | ;-------------------------------------------------------------------- |
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| 171 | ALIGN JUMP_ALIGN |
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| 172 | File_Read: |
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| 173 | push ds |
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| 174 | push dx |
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| 175 | push es ; Copy ES... |
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| 176 | pop ds ; ...to DS |
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| 177 | mov dx, di ; DS:DX now points to destination buffer |
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| 178 | mov ah, 3Fh ; Read from File or Device |
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| 179 | int 21h |
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| 180 | pop dx |
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| 181 | pop ds |
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| 182 | ret |
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| 183 | |
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| 184 | |
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| 185 | ;-------------------------------------------------------------------- |
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| 186 | ; Writes binary data to file. |
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| 187 | ; File position is updated so next write will start where |
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| 188 | ; previous write stopped. |
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[162] | 189 | ; |
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[2] | 190 | ; File_Write |
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| 191 | ; Parameters: |
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| 192 | ; BX: File handle |
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| 193 | ; CX: Number of bytes to write |
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| 194 | ; ES:DI: Ptr to source buffer |
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| 195 | ; Returns: |
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| 196 | ; AX: Number of bytes actually written if successfull (EOF check) |
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| 197 | ; DOS error code if CF set |
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| 198 | ; CF: Clear if successfull |
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| 199 | ; Set if error |
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| 200 | ; Corrupts registers: |
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| 201 | ; Nothing |
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| 202 | ;-------------------------------------------------------------------- |
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| 203 | ALIGN JUMP_ALIGN |
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| 204 | File_Write: |
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| 205 | push ds |
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| 206 | push dx |
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| 207 | push es ; Copy ES... |
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| 208 | pop ds ; ...to DS |
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| 209 | mov dx, di ; DS:DX now points to source buffer |
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| 210 | mov ah, 40h ; Write to File or Device |
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| 211 | int 21h |
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| 212 | pop dx |
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| 213 | pop ds |
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| 214 | ret |
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| 215 | |
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| 216 | |
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| 217 | ;-------------------------------------------------------------------- |
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| 218 | ; Sets current file position to wanted offset. |
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[162] | 219 | ; |
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[2] | 220 | ; File_SetFilePos |
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| 221 | ; Parameters: |
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| 222 | ; BX: File handle |
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| 223 | ; CX:DX: New offset (signed) |
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| 224 | ; Returns: |
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| 225 | ; AX: DOS error code if CF set |
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| 226 | ; CF: Clear if successfull |
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| 227 | ; Set if error |
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| 228 | ; Corrupts registers: |
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| 229 | ; Nothing |
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| 230 | ;-------------------------------------------------------------------- |
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| 231 | ALIGN JUMP_ALIGN |
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| 232 | File_SetFilePos: |
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| 233 | push dx |
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| 234 | mov ax, 42h<<8 ; Set Current File Position (from file start) |
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| 235 | int 21h |
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| 236 | pop dx |
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| 237 | ret |
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| 238 | |
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| 239 | |
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| 240 | ;-------------------------------------------------------------------- |
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| 241 | ; Changes current default drive. |
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[162] | 242 | ; |
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[2] | 243 | ; File_SetDrive |
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| 244 | ; Parameters: |
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| 245 | ; DL: New default drive (00h=A:, 01h=B: ...) |
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| 246 | ; Returns: |
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| 247 | ; AL: Number of potentially valid drive letters available |
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| 248 | ; Corrupts registers: |
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| 249 | ; AH |
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| 250 | ;-------------------------------------------------------------------- |
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| 251 | ALIGN JUMP_ALIGN |
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| 252 | File_SetDrive: |
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| 253 | mov ah, 0Eh ; Select Default Drive |
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| 254 | int 21h |
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| 255 | ret |
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| 256 | |
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| 257 | |
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| 258 | ;-------------------------------------------------------------------- |
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| 259 | ; Returns current default drive and number of |
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| 260 | ; potentially drive letters available. |
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[162] | 261 | ; |
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[2] | 262 | ; File_GetDrive |
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| 263 | ; Parameters: |
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| 264 | ; Nothing |
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| 265 | ; Returns: |
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| 266 | ; AL: Number of potentially valid drive letters available |
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| 267 | ; AH: Current default drive (00h=A:, 01h=B: ...) |
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| 268 | ; Corrupts registers: |
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| 269 | ; Nothing |
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| 270 | ;-------------------------------------------------------------------- |
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| 271 | ALIGN JUMP_ALIGN |
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| 272 | File_GetDrive: |
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| 273 | push dx |
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| 274 | mov ah, 19h ; Get Current Default Drive |
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| 275 | int 21h ; Get drive to AL |
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| 276 | mov dl, al ; Copy drive number to DL |
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| 277 | call File_SetDrive ; Set to current and get drive letter count |
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| 278 | mov ah, dl ; Copy current drive to AH |
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| 279 | pop dx |
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| 280 | ret |
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| 281 | |
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| 282 | |
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| 283 | ;-------------------------------------------------------------------- |
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[162] | 284 | ; Checks are the potentially valid drive letters returned by |
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[2] | 285 | ; File_SetDrive and File_GetDrive actually valid or not. |
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[162] | 286 | ; |
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[2] | 287 | ; File_IsDrive |
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| 288 | ; Parameters: |
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| 289 | ; DL: Drive number (00h=A:, 01h=B: ...) |
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| 290 | ; Returns: |
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| 291 | ; AL: 00h if valid drive number, FFh if invalid drive number |
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| 292 | ; ZF: Set if drive number is valid |
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| 293 | ; Cleared if drive number is invalid |
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| 294 | ; Corrupts registers: |
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| 295 | ; AH |
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| 296 | ;-------------------------------------------------------------------- |
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| 297 | ALIGN JUMP_ALIGN |
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| 298 | File_IsDrive: |
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| 299 | push ds |
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| 300 | push bx |
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| 301 | inc dx ; 00h=default drive, 01h=A:, 02h=B: ... |
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| 302 | mov ah, 32h ; Get DOS Drive Parameter Block for Specific Drive |
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| 303 | int 21h |
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| 304 | dec dx ; Restore DX |
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| 305 | test al, al ; Set ZF according to result |
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| 306 | pop bx |
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| 307 | pop ds |
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| 308 | ret |
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| 309 | |
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| 310 | |
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| 311 | ;-------------------------------------------------------------------- |
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| 312 | ; Returns number of valid drive letters. |
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[162] | 313 | ; |
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[2] | 314 | ; File_GetValidDrvCnt |
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| 315 | ; Parameters: |
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| 316 | ; Nothing |
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| 317 | ; Returns: |
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| 318 | ; CX: Number of valid drives |
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| 319 | ; Corrupts registers: |
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| 320 | ; AX, DX |
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| 321 | ;-------------------------------------------------------------------- |
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| 322 | ALIGN JUMP_ALIGN |
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| 323 | File_GetValidDrvCnt: |
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| 324 | call File_GetDrive ; Get potential drive letters to AL |
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| 325 | eMOVZX cx, al ; Letter count to CX |
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| 326 | xor dx, dx ; Zero DX (DH=valid count, DL=drv num) |
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| 327 | ALIGN JUMP_ALIGN |
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| 328 | .LetterLoop: |
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| 329 | call File_IsDrive |
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| 330 | not al ; Invert return bits |
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| 331 | and al, 1 ; Clear all but bit 1 |
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| 332 | add dh, al ; Increment valid count |
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| 333 | inc dx ; Increment drive number |
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| 334 | loop .LetterLoop ; Loop while drive letters left |
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[162] | 335 | mov cl, dh ; Valid drv count to CX |
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[2] | 336 | ret |
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| 337 | |
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| 338 | |
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| 339 | ;-------------------------------------------------------------------- |
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| 340 | ; Return device number for Nth valid drive. |
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| 341 | ; This function does not check if index in CX is valid. |
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[162] | 342 | ; |
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[2] | 343 | ; File_GetNthValidDrv |
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| 344 | ; Parameters: |
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| 345 | ; CX: Index of valid drive to look for |
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| 346 | ; Returns: |
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| 347 | ; AX: Drive letter (A, B...) |
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| 348 | ; DX: Drive device number (00h=A:, 01h=B: ...) |
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| 349 | ; Corrupts registers: |
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| 350 | ; CX |
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[162] | 351 | ;-------------------------------------------------------------------- |
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[2] | 352 | ALIGN JUMP_ALIGN |
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| 353 | File_GetNthValidDrv: |
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| 354 | inc cx ; Index to count |
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| 355 | mov dx, -1 ; Dev num, increments to zero |
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| 356 | ALIGN JUMP_ALIGN |
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| 357 | .DrvLoop: |
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| 358 | inc dx ; Increment device number |
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| 359 | call File_IsDrive ; Is drive valid? |
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| 360 | jnz .DrvLoop ; Loop if not |
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| 361 | loop .DrvLoop ; Loop until wanted drive found |
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| 362 | mov ax, dx ; Drive device number to AX |
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| 363 | add ax, 'A' ; Dev number to drive letter |
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| 364 | ret |
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| 365 | |
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| 366 | |
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| 367 | ;-------------------------------------------------------------------- |
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| 368 | ; Changes current directory. |
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[162] | 369 | ; |
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[2] | 370 | ; File_ChangeDir |
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| 371 | ; Parameters: |
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| 372 | ; DS:DX Ptr to destination ASCIZ path name |
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| 373 | ; Returns: |
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| 374 | ; AX: DOS Error code |
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| 375 | ; CF: Clear if successfull |
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| 376 | ; Set if error |
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| 377 | ; Corrupts registers: |
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| 378 | ; Nothing |
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| 379 | ;-------------------------------------------------------------------- |
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| 380 | ALIGN JUMP_ALIGN |
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| 381 | File_ChangeDir: |
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| 382 | mov ah, 3Bh ; Set Current Directory |
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| 383 | int 21h |
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| 384 | ret |
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| 385 | |
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| 386 | |
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| 387 | ;-------------------------------------------------------------------- |
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| 388 | ; Finds files from wanted path using search wildcard characters. |
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[162] | 389 | ; |
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[2] | 390 | ; File_FindAndCount |
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| 391 | ; Parameters: |
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| 392 | ; DS:DX Ptr to ASCIZ path or file name (* and ? wildcards allowed) |
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| 393 | ; Returns: |
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| 394 | ; CX: Number of files found |
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| 395 | ; Corrupts registers: |
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| 396 | ; AX |
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| 397 | ;-------------------------------------------------------------------- |
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| 398 | ALIGN JUMP_ALIGN |
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| 399 | File_IsFile: |
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| 400 | File_FindAndCount: |
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| 401 | xor cx, cx ; Zero file count |
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| 402 | call File_FindFirst ; Find first file |
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| 403 | jc .Return ; Return if no files found |
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| 404 | ALIGN JUMP_ALIGN |
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| 405 | .IsNextLoop: |
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| 406 | inc cx ; Increment file count |
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| 407 | call File_FindNext ; Find next file |
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| 408 | jnc .IsNextLoop ; Loop while files left |
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| 409 | ALIGN JUMP_ALIGN |
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| 410 | .Return: |
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| 411 | ret |
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| 412 | |
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| 413 | |
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| 414 | ;-------------------------------------------------------------------- |
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| 415 | ; Finds files from wanted path using search wildcard characters. |
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| 416 | ; Ptr to DTA is returned for wanted file. |
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[162] | 417 | ; |
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[2] | 418 | ; File_GetDTA |
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| 419 | ; Parameters: |
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| 420 | ; CX: Index for file whose DTA is to be returned |
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| 421 | ; DS:DX Ptr to ASCIZ path or file name (* and ? wildcards allowed) |
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| 422 | ; Returns: |
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| 423 | ; DS:BX: Ptr to file DTA |
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| 424 | ; CF: Set if file was not found |
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| 425 | ; Cleared if file found and DTA is returned |
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| 426 | ; Corrupts registers: |
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| 427 | ; AX, DX |
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| 428 | ;-------------------------------------------------------------------- |
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| 429 | ALIGN JUMP_ALIGN |
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| 430 | File_GetDTA: |
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| 431 | call File_FindFirst ; Find first file |
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| 432 | jc .RetErr ; Return if no files found |
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| 433 | xor dx, dx ; Zero file index |
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| 434 | ALIGN JUMP_ALIGN |
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| 435 | .IsNextLoop: |
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| 436 | cmp cx, dx ; Wanted file found? |
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| 437 | je .RetDTA ; If so, jump to return DTA |
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| 438 | inc dx ; Increment index for next file |
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| 439 | call File_FindNext ; Find next file |
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| 440 | jnc .IsNextLoop ; Loop while files left |
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| 441 | .RetErr: |
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| 442 | ret |
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| 443 | ALIGN JUMP_ALIGN |
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| 444 | .RetDTA: |
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| 445 | push cs ; Push code segment |
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| 446 | pop ds ; CS to DS |
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| 447 | mov bx, 80h ; DTA starts at DOS PSP:80h |
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| 448 | ret |
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| 449 | |
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| 450 | |
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| 451 | ;-------------- Private functions --------------------- |
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| 452 | |
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| 453 | ;-------------------------------------------------------------------- |
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| 454 | ; Find first file or directory. |
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[162] | 455 | ; |
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[2] | 456 | ; File_FindFirst |
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| 457 | ; Parameters: |
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| 458 | ; DS:DX Ptr to ASCIZ path or file name (* and ? wildcards allowed) |
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| 459 | ; Returns: |
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| 460 | ; AX: DOS Error code |
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| 461 | ; CF: Set if file was not found |
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| 462 | ; Cleared if file was found |
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| 463 | ; Corrupts registers: |
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| 464 | ; Nothing |
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| 465 | ;-------------------------------------------------------------------- |
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| 466 | ALIGN JUMP_ALIGN |
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| 467 | File_FindFirst: |
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| 468 | push cx |
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| 469 | ;mov cx, FLG_FATTR_DIR ; Directories and files |
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| 470 | xor cx, cx |
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| 471 | mov ax, 4Eh<<8 ; Find First Matching File |
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| 472 | int 21h |
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| 473 | pop cx |
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| 474 | ret |
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| 475 | |
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| 476 | |
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| 477 | ;-------------------------------------------------------------------- |
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| 478 | ; Find next file or directory. File_FindFirst must always be called |
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| 479 | ; before calling File_FindNext. |
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[162] | 480 | ; |
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[2] | 481 | ; File_FindNext |
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| 482 | ; Parameters: |
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| 483 | ; Nothing |
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| 484 | ; Returns: |
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| 485 | ; AX: DOS Error code |
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| 486 | ; CF: Set if file was not found |
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| 487 | ; Cleared if file was found |
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| 488 | ; Corrupts registers: |
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| 489 | ; Nothing |
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| 490 | ;-------------------------------------------------------------------- |
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| 491 | ALIGN JUMP_ALIGN |
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| 492 | File_FindNext: |
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| 493 | mov ah, 4Fh ; Find Next Matching File |
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| 494 | int 21h |
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| 495 | ret |
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