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main.s
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main.s
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.section .rodata
#Magic numbers of each file
sb_pbm: .string "0x5031"
sb_rle: .string "0x524C4549"
#Elements to be referenced in stdout file
mnu: .asciz "\nMenu:\n1. Compress PBM image\n2. Decompress RLE image\n3. Exit\n\nSo your choice is: "
req: .asciz "Input file name with extension: "
req2: .asciz "Output file name: "
err1: .asciz "Invalid answer. You can try again: "
err2: .asciz "File couldn't be opened"
err3: .asciz "%s: In this project, the PBM image should start at 0x5031\n"
err4: .asciz "%s: In this project, the RLE image should start at 0x524C4549\n"
err5: .asciz "%s: In regards to this project, that RLE format file is invalid\n"
ag: .asciz "Done.\nWould you want to operate with another file? (y/n): "
y: .asciz "y"
hzero: .asciz "0x"
#Header files parameters, printf formats, macros and extensions
frle: .asciz ".rle"
fpbm: .asciz ".pbm"
fmt1: .asciz "%d"
fmt2: .asciz "%s"
fmt3: .asciz "06%d"
fmode1: .asciz "rb"
fmode2: .asciz "w"
hxpadd1: .asciz "%04X%s"
hxpadd2: .asciz "%04X"
succ: .asciz "EXIT_SUCCESS"
fail: .asciz "EXIT_FAILURE"
null: .asciz "NULL"
.section .data
#Pitch image
pitch: .int 0
#Multiplier
multi: .int 1
.section .bss
#Reserved memory areas (big lengths in case of overrflow issues)
.comm opt, 10
.comm fptr, 10
.comm fname, 10
.comm fname2, 10
.lcomm fncpy, 10
.lcomm cpy1, 10
.lcomm cpy2, 10
.lcomm cpy3, 10
.lcomm cpy4, 10
.lcomm buff1, 1000
.lcomm buff2, 1000
.lcomm buff3, 1000
.lcomm rle_pixels, 100000000
.lcomm pbm_pixels, 100000000
.section .text
.globl _main
_main:
call ___main
choice:
pushl $sb_rle
pushl $cpy1 #Copying RLE file
call _strcpy #magic number
addl $8, %esp
pushl $sb_pbm
pushl $cpy2 #Copying PBM file
call _strcpy #magic number
addl $8, %esp
pushl $mnu
call _printf #Invoking menu
addl $4, %esp
pushl $opt
pushl $fmt1
call _scanf #Reading the user choice
addl $8, %esp
movl opt, %eax
movl $1, %ebx
cmpl %ebx, %eax
jl ipt_err1 #Checking out
movl $3, %ebx #inputs
cmpl %ebx, %eax
jg ipt_err1
cmpl $1, %eax
je compressing
cmpl $2, %eax #Determining
je decompressing #the program focus
cmpl $3, %eax
je finish
whatnow:
pushl $ag
pushl $fmt2
call _printf
addl $8, %esp
pushl $opt
pushl $fmt2 #Asking user
call _scanf #for another decision
addl $8, %esp
pushl $y
pushl $opt
call _strcmp
addl $8, %esp
cmpl $0, %eax
jne finish
jmp choice
compressing:
movl $0, pitch #Restarting pitch
pushl $req
call _printf
addl $4, %esp #Saving
pushl $fname #file name
pushl $fmt2
call _scanf
addl $8, %esp
pushl $req2
call _printf
addl $4, %esp #Saving output
pushl $fname2 #file name
pushl $fmt2
call _scanf
addl $8, %esp
pushl $fmode1
pushl $fname
call _fopen #Getting
addl $8, %esp #file pointer
cmpb $0, %al
je ipt_err2
movl %eax, fptr
pushl fptr
pushl $3
pushl $2 #Reading magic
pushl $buff1 #number
call _fread
addl $16, %esp
pushl $buff1
pushl $cpy2
call _strcmp #Validating PBM file magic number
addl $8, %esp
cmpl $0, %eax
jne ipt_err3
pushl fptr
pushl $4
pushl $2 #Getting image
pushl $buff1 #width and height
call _fread
addl $16, %esp
pushl $buff1
pushl $cpy1 #Appending width and height
call _strcat #to rle file preface
addl $8, %esp
pushl $1000
pushl $0
pushl $buff1
call _memset
addl $12, %esp
pushl fptr
pushl $1
pushl $2 #Reading first
pushl $buff1 #two pixels
call _fread
addl $16, %esp
pushl $buff1
pushl $cpy3 #Copying those last two pixels
call _strcpy
addl $8, %esp
movl $1, %ebx #Initializing counter
pwhile:
pushl $1000
pushl $0
pushl $buff1
call _memset
addl $12, %esp
pushl fptr
pushl $1
pushl $2
pushl $buff1
call _fread #Reading 2 bytes from file
addl $16, %esp #until it is no longer applicable
cmpl $1, %eax
jne lastb
pushl $buff1
pushl $cpy3
call _strcmp #Comparing copy of last byte
addl $8, %esp #with actual byte
cmpb $0, %al
jne diff
pushl $buff1
pushl $cpy3 #Copying actual byte
call _strcpy
addl $8, %esp
addl $1, %ebx
jmp pwhile
diff: #If there was some difference
pushl $cpy3
pushl %ebx
pushl $hxpadd1
pushl $buff2 #Saving similar pixels
call _sprintf
addl $16, %esp
addl $3, pitch
pushl $buff2
pushl $rle_pixels #Saving pixels
call _strcat
addl $8, %esp
pushl $buff1
pushl $cpy3 #Saving last byte
call _strcpy
addl $8, %esp
movl $1, %ebx #Restarting counter
jmp pwhile
lastb: #We reach last byte
pushl $cpy3
pushl %ebx
pushl $hxpadd1
pushl $buff2 #Saving similar pixels
call _sprintf
addl $16, %esp
addl $3, pitch
pushl $buff2
pushl $rle_pixels #Saving pixels
call _strcat
addl $8, %esp
pushl fptr
call _fclose #Closing pbm file
addl $4, %esp
pushl $frle
pushl $fname2 #Adding .rle extension
call _strcat
addl $8, %esp
pushl $fmode2
pushl $fname2
call _fopen #Opening compression file
addl $8, %esp
movl %eax, fptr
pushl $cpy1
pushl $fmt2 #Writing starting bytes
pushl fptr
call _fprintf
addl $8, %esp
pushl pitch
pushl $hxpadd2
pushl fptr #Writing the indicator of n compressed pixels
call _fprintf
addl $8, %esp
pushl fptr
pushl $rle_pixels
call _fputs #Writing compressed pixels
addl $4, %esp
pushl $100000000
pushl $0
pushl $rle_pixels
call _memset
addl $8, %esp
pushl fptr
call _fclose #Closing compressed file
addl $4, %esp
jmp whatnow
decompressing:
movl $1, multi #Restarting multiplier
pushl $hzero
pushl $cpy4 #Copying leading hexa-zero Ox
call _strcpy
addl $8, %esp
pushl $req
call _printf
addl $4, %esp #Saving
pushl $fname #file name
pushl $fmt2
call _scanf
addl $8, %esp
pushl $req2
call _printf
addl $4, %esp #Saving output
pushl $fname2 #file name
pushl $fmt2
call _scanf
addl $8, %esp
pushl $fmode1
pushl $fname
call _fopen #Getting
addl $8, %esp #file pointer
cmpb $0, %al
je ipt_err2
movl %eax, fptr
pushl fptr
pushl $5
pushl $2 #Reading magic
pushl $buff1 #number
call _fread
addl $16, %esp
pushl $buff1
pushl $cpy1
call _strcmp #Validating RLE file magic number
addl $8, %esp
cmpl $0, %eax
jne ipt_err4
pushl $1000
pushl $0
pushl $buff1
call _memset
addl $12, %esp
pushl fptr
pushl $4
pushl $2 #Getting image width,
pushl $buff1 #height and n-pixels
call _fread
addl $16, %esp
pushl $buff1
pushl $cpy2 #Appending width and height
call _strcat #to pbm file preface
addl $8, %esp
pushl $1000
pushl $0
pushl $buff1
call _memset
addl $12, %esp
pushl fptr
pushl $2
pushl $2 #Skipping image pitch
pushl $buff1
call _fread
addl $16, %esp
movl $1, %ebx #Initializing multiplier
rwhile:
pushl fptr
pushl $2
pushl $2
pushl $buff1
call _fread #Reading 4 bytes from file
addl $16, %esp
cmpl $2, %eax
jne endwhile
pushl $buff1
pushl $cpy4 #Appending leading hexa-zero
call _strcat #to those last 4 bytes
addl $8, %esp
pushl $16
pushl $null
pushl $cpy4 #Conversion from hex to long
call _strtol
movl %eax, %ebx #%ebx will have this resulting long
pushl $hzero
pushl $cpy4 #Restoring copy of
call _strcpy #leading hexa-zero Ox
addl $8, %esp
pushl fptr
pushl $1 #Reading next 2 bytes
pushl $2 #corresponding the image pixel, respectively.
pushl $buff2 #If this was not applicable, then
call _fread #we can assume that the input rle format
addl $16, %esp #was not correct in regards to the
cmpl $1, %eax #approach to this project issue
jne ipt_err5
pushl %ebx
pushl $buff2
pushl %ebx #Multiplying bytes
call mul
addl $12, %esp
popl %ebx
movl $1, %ebx #Restoring multiplier
jmp rwhile
endwhile:
pushl fptr
call _fclose #Closing RLE file
addl $4, %esp
pushl $fpbm
pushl $fname2 #Adding .pbm extension
call _strcat
addl $8, %esp
pushl $fmode2
pushl $fname2
call _fopen #Opening decompressed file
addl $8, %esp
movl %eax, fptr
pushl $cpy2
pushl $fmt2 #Adding pbm file preface
pushl fptr
call _fprintf
addl $8, %esp
pushl fptr
pushl $pbm_pixels
call _fputs #Writing decompressed pixels
addl $4, %esp
pushl $100000000
pushl $0
pushl $pbm_pixels
call _memset
addl $8, %esp
pushl fptr
call _fclose #Closing decompressed file
addl $4, %esp
jmp whatnow
mul:
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %esi
movl 12(%ebp), %edi
movl $0, %ebx
loop:
cmpl %esi, %ebx
je eloop
pushl %edi
pushl $pbm_pixels
call _strcat
addl $8, %esp
incl %ebx
jmp loop
eloop:
leave
ret
finish:
pushl $succ
call _exit
ipt_err1:
pushl $err1
call _printf
addl $4, %esp
jmp choice
ipt_err2:
pushl $err2
call _perror
addl $4, %esp
pushl $fail
call _exit
ipt_err3:
pushl $fname
pushl $err3
call _printf
addl $8, %esp
pushl fptr
call _fclose
addl $4, %esp
pushl $fail
call _exit
ipt_err4:
pushl $fname
pushl $err4
call _printf
addl $8, %esp
pushl fptr
call _fclose
addl $4, %esp
pushl $fail
call _exit
ipt_err5:
pushl $fname
pushl $err5
call _printf
addl $8, %esp
pushl fptr
call _fclose
addl $4, %esp
pushl $fail
call _exit