;;================================================================================================;;
;;//// 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 ;;
;;================================================================================================;;
;;////////////////////////////////////////////////////////////////////////////////////////////////;;
;;================================================================================================;;