forked from KolibriOS/kolibrios
231 lines
8.2 KiB
NASM
231 lines
8.2 KiB
NASM
|
;;================================================================================================;;
|
||
|
|
;;//// pnm.asm //// (c) dunkaist, 2012 ///////////////////////////////////////////////////////////;;
|
||
|
|
;;================================================================================================;;
|
||
|
|
;; ;;
|
||
|
|
;; This file is part of Common development libraries (Libs-Dev). ;;
|
||
|
|
;; ;;
|
||
|
|
;; Libs-Dev is free software: you can redistribute it and/or modify it under the terms of the GNU ;;
|
||
|
|
;; Lesser General Public License as published by the Free Software Foundation, either version 2.1 ;;
|
||
|
|
;; of the License, or (at your option) any later version. ;;
|
||
|
|
;; ;;
|
||
|
|
;; Libs-Dev is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without ;;
|
||
|
|
;; even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ;;
|
||
|
|
;; Lesser General Public License for more details. ;;
|
||
|
|
;; ;;
|
||
|
|
;; You should have received a copy of the GNU Lesser General Public License along with Libs-Dev. ;;
|
||
|
|
;; If not, see <http://www.gnu.org/licenses/>. ;;
|
||
|
|
;; ;;
|
||
|
|
;;================================================================================================;;
|
||
|
|
|
||
|
|
include 'pnm.inc'
|
||
|
|
|
||
|
|
;;================================================================================================;;
|
||
|
|
proc img.is.pnm _data, _length ;//////////////////////////////////////////////////////////////////;;
|
||
|
|
;;------------------------------------------------------------------------------------------------;;
|
||
|
|
;? Determine if raw data could be decoded (is in pnm format) ;;
|
||
|
|
;;------------------------------------------------------------------------------------------------;;
|
||
|
|
;> _data = raw data as read from file/stream ;;
|
||
|
|
;> _length = data length ;;
|
||
|
|
;;------------------------------------------------------------------------------------------------;;
|
||
|
|
;< eax = false / true ;;
|
||
|
|
;;================================================================================================;;
|
||
|
|
|
||
|
|
xor eax, eax
|
||
|
|
|
||
|
|
mov ecx, [_data]
|
||
|
|
mov cx, word[ecx]
|
||
|
|
xchg cl, ch
|
||
|
|
cmp cx, '1P'
|
||
|
|
jb .is_not_pnm
|
||
|
|
cmp cx, '6P'
|
||
|
|
ja .is_not_pnm
|
||
|
|
|
||
|
|
.is_pnm:
|
||
|
|
inc eax
|
||
|
|
.is_not_pnm:
|
||
|
|
ret
|
||
|
|
|
||
|
|
endp
|
||
|
|
|
||
|
|
;;================================================================================================;;
|
||
|
|
proc img.decode.pnm _data, _length, _options ;////////////////////////////////////////////////////;;
|
||
|
|
;;------------------------------------------------------------------------------------------------;;
|
||
|
|
;? Decode data into image if it contains correctly formed raw data in pnm format ;;
|
||
|
|
;;------------------------------------------------------------------------------------------------;;
|
||
|
|
;> _data = raw data as read from file/stream ;;
|
||
|
|
;> _length = data length ;;
|
||
|
|
;;------------------------------------------------------------------------------------------------;;
|
||
|
|
;< eax = 0 (error) or pointer to image ;;
|
||
|
|
;;================================================================================================;;
|
||
|
|
locals
|
||
|
|
width rd 1
|
||
|
|
height rd 1
|
||
|
|
pnm_type rd 1
|
||
|
|
data_type rd 1 ; raw or ascii
|
||
|
|
maxval rd 1
|
||
|
|
retvalue rd 1
|
||
|
|
endl
|
||
|
|
|
||
|
|
pusha
|
||
|
|
|
||
|
|
mov esi, [_data]
|
||
|
|
lodsw
|
||
|
|
cmp ax, 'P1'
|
||
|
|
jne @f
|
||
|
|
mov [pnm_type], PNM_PBM
|
||
|
|
mov [data_type], PNM_ASCII
|
||
|
|
jmp .parse_header
|
||
|
|
@@:
|
||
|
|
cmp ax, 'P2'
|
||
|
|
jne @f
|
||
|
|
mov [pnm_type], PNM_PGM
|
||
|
|
mov [data_type], PNM_ASCII
|
||
|
|
jmp .parse_header
|
||
|
|
@@:
|
||
|
|
cmp ax, 'P3'
|
||
|
|
jne @f
|
||
|
|
mov [pnm_type], PNM_PPM
|
||
|
|
mov [data_type], PNM_ASCII
|
||
|
|
jmp .parse_header
|
||
|
|
@@:
|
||
|
|
cmp ax, 'P4'
|
||
|
|
jne @f
|
||
|
|
mov [pnm_type], PNM_PBM
|
||
|
|
mov [data_type], PNM_RAW
|
||
|
|
jmp .parse_header
|
||
|
|
@@:
|
||
|
|
cmp ax, 'P5'
|
||
|
|
jne @f
|
||
|
|
mov [pnm_type], PNM_PGM
|
||
|
|
mov [data_type], PNM_RAW
|
||
|
|
jmp .parse_header
|
||
|
|
@@:
|
||
|
|
cmp ax, 'P6'
|
||
|
|
jne @f
|
||
|
|
mov [pnm_type], PNM_PPM
|
||
|
|
mov [data_type], PNM_RAW
|
||
|
|
jmp .parse_header
|
||
|
|
@@:
|
||
|
|
|
||
|
|
.parse_header:
|
||
|
|
xor eax, eax
|
||
|
|
mov [width], eax
|
||
|
|
mov [height], eax
|
||
|
|
mov [maxval], eax
|
||
|
|
|
||
|
|
.next_char:
|
||
|
|
lodsb
|
||
|
|
cmp al, '#'
|
||
|
|
jb .next_char
|
||
|
|
ja .read_number
|
||
|
|
.comment:
|
||
|
|
mov edi, esi
|
||
|
|
mov al, 0x0A
|
||
|
|
mov ecx, edi
|
||
|
|
sub ecx, [_data]
|
||
|
|
neg ecx
|
||
|
|
add ecx, [_length]
|
||
|
|
repne scasb
|
||
|
|
mov esi, edi
|
||
|
|
jmp .next_char
|
||
|
|
|
||
|
|
.read_number:
|
||
|
|
sub eax, 0x30
|
||
|
|
mov ebx, eax
|
||
|
|
@@:
|
||
|
|
lodsb
|
||
|
|
cmp al, '0'
|
||
|
|
jb .number_done
|
||
|
|
sub eax, 0x30
|
||
|
|
imul ebx, 10
|
||
|
|
add ebx, eax
|
||
|
|
jmp @b
|
||
|
|
|
||
|
|
.number_done:
|
||
|
|
cmp [width], 0
|
||
|
|
jne @f
|
||
|
|
mov [width], ebx
|
||
|
|
jmp .next_char
|
||
|
|
@@:
|
||
|
|
cmp [height], 0
|
||
|
|
jne @f
|
||
|
|
mov [height], ebx
|
||
|
|
cmp [pnm_type], PNM_PBM
|
||
|
|
je .header_parsed
|
||
|
|
jmp .next_char
|
||
|
|
@@:
|
||
|
|
mov [maxval], ebx
|
||
|
|
|
||
|
|
.header_parsed:
|
||
|
|
|
||
|
|
mov eax, [pnm_type]
|
||
|
|
cmp eax, PNM_PBM
|
||
|
|
je .pbm
|
||
|
|
cmp eax, PNM_PGM
|
||
|
|
je .pgm
|
||
|
|
cmp eax, PNM_PPM
|
||
|
|
je .ppm
|
||
|
|
jmp .quit
|
||
|
|
|
||
|
|
|
||
|
|
include 'pbm.asm'
|
||
|
|
include 'pgm.asm'
|
||
|
|
include 'ppm.asm'
|
||
|
|
|
||
|
|
.quit:
|
||
|
|
popa
|
||
|
|
mov eax, [retvalue]
|
||
|
|
ret
|
||
|
|
|
||
|
|
endp
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
;;================================================================================================;;
|
||
|
|
proc img.encode.pnm _img, _p_length, _options ;///////////////////////////////////////////////////;;
|
||
|
|
;;------------------------------------------------------------------------------------------------;;
|
||
|
|
;? Encode image into raw data in pnm format ;;
|
||
|
|
;;------------------------------------------------------------------------------------------------;;
|
||
|
|
;> _img = pointer to image ;;
|
||
|
|
;;------------------------------------------------------------------------------------------------;;
|
||
|
|
;< eax = 0 (error) or pointer to encoded data ;;
|
||
|
|
;< _p_length = encoded data length ;;
|
||
|
|
;;================================================================================================;;
|
||
|
|
xor eax, eax
|
||
|
|
ret
|
||
|
|
endp
|
||
|
|
|
||
|
|
|
||
|
|
;;================================================================================================;;
|
||
|
|
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
|
||
|
|
;;================================================================================================;;
|
||
|
|
;! Below are private procs you should never call directly from your code ;;
|
||
|
|
;;================================================================================================;;
|
||
|
|
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
|
||
|
|
;;================================================================================================;;
|
||
|
|
proc pnm._.get_number
|
||
|
|
sub eax, '0'
|
||
|
|
mov ebx, eax
|
||
|
|
@@:
|
||
|
|
lodsb
|
||
|
|
cmp al, '0'
|
||
|
|
jb .quit
|
||
|
|
sub eax, '0'
|
||
|
|
lea eax, [ebx*8 + eax]
|
||
|
|
lea ebx, [ebx*2 + eax]
|
||
|
|
; imul ebx, 10
|
||
|
|
; add ebx, eax
|
||
|
|
jmp @b
|
||
|
|
.quit:
|
||
|
|
ret
|
||
|
|
endp
|
||
|
|
|
||
|
|
;;================================================================================================;;
|
||
|
|
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
|
||
|
|
;;================================================================================================;;
|
||
|
|
;! Below is private data you should never use directly from your code ;;
|
||
|
|
;;================================================================================================;;
|
||
|
|
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
|
||
|
|
;;================================================================================================;;
|
||
|
|
|