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qrcode.red
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qrcode.red
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Red []
#include %image-lib.red
qrcode-lib: context [
system/catalog/errors/user: make system/catalog/errors/user [qrcode: ["qrcode [" :arg1 ": (" :arg2 " " :arg3 ")]"]]
new-error: func [name [word!] arg2 arg3][
cause-error 'user 'qrcode [name arg2 arg3]
]
default-scale: 3
buffer-len?: function [ver [integer!]][
temp: ver * 4 + 17
temp: temp * temp / 8 + 1
temp
]
mode-indicators: [
terminator {0000}
fnc1-first {0101}
fnc1-second {1001}
struct {0011}
kanji {1000}
byte {0100}
alphanumber {0010}
number {0001}
eci {0111}
chinese {1101}
]
padding-bin: [
{11101100}
{00010001}
]
VERSION_MIN: 1
VERSION_MAX: 40
REED_SOLOMON_DEGREE_MAX: 30
max-buffer: function [][
len: buffer-len? VERSION_MAX
res: make binary! len
append/dup res 0 len
]
error-group: [
L 7%
M 15%
Q 25%
H 30%
]
ECC_CODEWORDS_PER_BLOCK: [
L [ 7 10 15 20 26 18 20 24 30 18 20 24 26 30 22 24 28 30 28 28 28 28 30 30 26 28 30 30 30 30 30 30 30 30 30 30 30 30 30 30]
M [10 16 26 18 24 16 18 22 22 26 30 22 22 24 24 28 28 26 26 26 26 28 28 28 28 28 28 28 28 28 28 28 28 28 28 28 28 28 28 28]
Q [13 22 18 26 18 24 18 22 20 24 28 26 24 20 30 24 28 28 26 30 28 30 30 30 30 28 30 30 30 30 30 30 30 30 30 30 30 30 30 30]
H [17 28 22 16 22 28 26 26 24 28 24 28 22 24 24 30 28 28 26 28 30 24 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30]
]
NUM_ERROR_CORRECTION_BLOCKS: [
L [ 1 1 1 1 1 2 2 2 2 4 4 4 4 4 6 6 6 6 7 8 8 9 9 10 12 12 12 13 14 15 16 17 18 19 19 20 21 22 24 25]
M [ 1 1 1 2 2 4 4 4 5 5 5 8 9 9 10 10 11 13 14 16 17 17 18 20 21 23 25 26 28 29 31 33 35 37 38 40 43 45 47 49]
Q [ 1 1 2 2 4 4 6 6 8 8 8 10 12 16 12 17 16 18 21 20 23 23 25 27 29 34 34 35 38 40 43 45 48 51 53 56 59 62 65 68]
H [ 1 1 2 4 4 4 5 6 8 8 11 11 16 16 18 16 19 21 25 25 25 34 30 32 35 37 40 42 45 48 51 54 57 60 63 66 70 74 77 81]
]
alphanumber: "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:"
number-mode?: function [str [string!]][
forall str [
int: to integer! str/1
if any [
int < 30h
int > 39h
][return false]
]
true
]
alphanumber-mode?: function [str [string!]][
forall str [
unless find/case alphanumber str/1 [return false]
]
true
]
get-data-modules-bits: function [ver [integer!]][
res: (16 * ver + 128) * ver + 64
if ver >= 2 [
align: ver / 7 + 2
res: res - ((25 * align - 10) * align - 55)
if ver >= 7 [
res: res - 36
]
]
res
]
get-data-code-words-bytes: function [ver [integer!] ecc-level [word!]][
ecc-code-words: pick ECC_CODEWORDS_PER_BLOCK/(ecc-level) ver
num-ecc: pick NUM_ERROR_CORRECTION_BLOCKS/(ecc-level) ver
res: get-data-modules-bits ver
res: res / 8 - (ecc-code-words * num-ecc)
res
]
get-segment-bits: function [mode [word!] num-chars [integer!]][
if num-chars > 32767 [return none]
res: num-chars
case [
mode = 'number [
res: res * 10 + 2 / 3
]
mode = 'alphanumber [
res: res * 11 + 1 / 2
]
mode = 'byte [
res: res * 8
]
mode = 'kanji [
res: res * 13
]
all [
mode = 'eci
num-chars = 0
][
res: 3 * 8
]
true [
return none
]
]
if res > 32767 [return none]
res
]
encode-number: function [str [string!]][
str-len: length? str
item: str
bits: make string! 64
while [0 < len: length? item][
either len >= 3 [
part: copy/part item 3
part-bin: to binary! to integer! part
part-str: enbase/base part-bin 2
if 10 > part-len: length? part-str [
new-error 'encode-number 'part-len reduce [10 part-len]
]
begin: skip part-str part-len - 10
append bits copy/part begin 10
item: skip item 3
][
either len = 1 [
part-bin: to binary! to integer! item
part-str: enbase/base part-bin 2
if 4 > part-len: length? part-str [
new-error 'encode-number 'part-len reduce [4 part-len]
]
begin: skip part-str part-len - 4
append bits copy/part begin 4
item: skip item 1
][
part-bin: to binary! to integer! item
part-str: enbase/base part-bin 2
if 7 > part-len: length? part-str [
new-error 'encode-number 'part-len reduce [7 part-len]
]
begin: skip part-str part-len - 7
append bits copy/part begin 7
item: skip item 2
]
]
]
reduce [
'mode 'number
'num-chars str-len
'data bits
]
]
encode-alphanumber: function [str [string!]][
str-len: length? str
table: make block! str-len
forall str [
index: index? find alphanumber str/1
append table index - 1
]
item: table
bits: make string! 64
while [0 < len: length? item][
either len >= 2 [
part-bin: to binary! (item/1 * 45 + item/2)
part-str: enbase/base part-bin 2
if 11 > part-len: length? part-str [
new-error 'encode-alphanumber 'part-len reduce [11 part-len]
]
begin: skip part-str part-len - 11
append bits copy/part begin 11
item: skip item 2
][
part-bin: to binary! item/1
part-str: enbase/base part-bin 2
if 6 > part-len: length? part-str [
new-error 'encode-alphanumber 'part-len reduce [6 part-len]
]
begin: skip part-str part-len - 6
append bits copy/part begin 6
item: skip item 1
]
]
reduce [
'mode 'alphanumber
'num-chars str-len
'data bits
]
]
encode-data: function [
str [string! binary!]
max-version [integer!]
][
either string? str [
bin: to binary! str
][
bin: copy str
]
if 0 = bin-len: length? bin [
return reduce [
'mode 'number
'num-chars bin-len
'data ""
]
]
;-- buffer len
buf-len: buffer-len? max-version
case [
number-mode? str [
unless blen: get-segment-bits 'number bin-len [
new-error 'get-segment-bits 'number bin-len
]
if ((blen + 7) / 8) > buf-len [
new-error 'encode-data 'buf-len buf-len
]
seg: encode-number str
]
alphanumber-mode? str [
unless blen: get-segment-bits 'alphanumber bin-len [
new-error 'get-segment-bits 'alphanumber bin-len
]
if ((blen + 7) / 8) > buf-len [
new-error 'encode-data 'buf-len buf-len
]
seg: encode-alphanumber str
]
true [
if bin-len > buf-len [
new-error 'encode-data 'buf-len buf-len
]
unless blen: get-segment-bits 'byte bin-len [
new-error 'get-segment-bits 'byte bin-len
]
seg: reduce [
'mode 'byte
'num-chars bin-len
'data enbase/base bin 2
]
]
]
seg
]
get-version-info: function [
version [integer!]
ecl [word!]
][
num-blocks: pick NUM_ERROR_CORRECTION_BLOCKS/(ecl) version
block-ecc-bytes: pick ECC_CODEWORDS_PER_BLOCK/(ecl) version
modules-bits: get-data-modules-bits version
cap-bytes: modules-bits / 8 - (num-blocks * block-ecc-bytes)
reduce [
'num-blocks num-blocks
'block-ecc-bytes block-ecc-bytes
'modules-bits modules-bits
'cap-bytes cap-bytes
]
]
get-segments-info: function [
segs [block!]
ecl [word!]
min-version [integer!]
max-version [integer!]
boost-ecl? [logic!]
][
unless all [
VERSION_MIN <= min-version
min-version <= max-version
max-version <= VERSION_MAX
][new-error 'get-segments-info 'version "out of range"]
unless find error-group ecl [
new-error 'get-segments-info 'ecl ecl
]
version: min-version
forever [
cap-bits: 8 * get-data-code-words-bytes version ecl
unless used-bits: total-bits segs version [
new-error 'get-segments-info 'used-bits reduce [segs version]
]
if all [
used-bits
used-bits <= cap-bits
][break]
if version >= max-version [
new-error 'get-segments-info 'version reduce [segs version]
]
version: version + 1
]
if boost-ecl? [
ecls: [M Q H]
forall ecls [
if used-bits <= (8 * get-data-code-words-bytes version ecls/1) [
ecl: ecls/1
]
]
]
res: reduce [
'version version
'ecl ecl
'segments segs
'used-bits used-bits
]
append res get-version-info version ecl
res
]
encode-segments: function [
segs [block!]
ecl [word!]
min-version [integer!]
max-version [integer!]
mask [integer!]
boost-ecl? [logic!]
][
unless all [
mask >= -1
mask <= 7
][new-error 'encode-segments 'mask mask]
sinfo: get-segments-info segs ecl min-version max-version boost-ecl?
version: sinfo/version
ecl: sinfo/ecl
data-str: build-data-code-words segs sinfo/used-bits version sinfo/cap-bytes
data-bin: debase/base data-str 2
code-words: build-code-words-with-ecc data-bin sinfo/modules-bits sinfo/num-blocks sinfo/block-ecc-bytes sinfo/cap-bytes
code-words-str: enbase/base code-words 2
;now start to draw
img: init-func-modules version
draw-code-words code-words-str img
draw-white-func-modules img version
mask-img: init-func-modules version
if mask = -1 [
min-penalty: none
i: 0
while [i < 8][
msk: i
apply-mask mask-img img msk
draw-format-bits ecl msk img
penalty: get-penalty-score img
if any [
min-penalty = none
penalty < min-penalty
][
mask: msk
min-penalty: penalty
]
apply-mask mask-img img msk
i: i + 1
]
]
apply-mask mask-img img mask
draw-format-bits ecl mask img
repend sinfo ['mask mask 'image img]
]
build-data-code-words: function [
segs [block!]
used-bits [integer!]
version [integer!]
cap-bytes [integer!]
][
res: make string! 200
forall segs [
mode: segs/1/mode
data: segs/1/data
num-chars: segs/1/num-chars
num-bits: num-char-bits mode version
part-bin: to binary! num-chars
part-str: enbase/base part-bin 2
if num-bits > part-len: length? part-str [
new-error 'build-data-code-words 'length reduce [num-bits part-len]
]
begin: skip part-str part-len - num-bits
append res rejoin [
select mode-indicators mode
copy/part begin num-bits
segs/1/data
]
]
if used-bits <> (bit-len: length? res) [
new-error 'build-data-code-words 'used-bits reduce [used-bits bit-len]
]
cap-bits: cap-bytes * 8
if bit-len > cap-bits [
new-error 'build-data-code-words 'bit-len reduce [bit-len cap-bits]
]
if 4 < terminator-bits: cap-bits - bit-len [
terminator-bits: 4
]
append/dup res "0" terminator-bits
res-len: length? res
m: res-len % 8
if m <> 0 [
append/dup res "0" 8 - m
]
bit-len: length? res
if 0 <> (bit-len % 8) [
new-error 'build-data-code-words 'bit-len bit-len
]
res-len: (length? res) / 8
if res-len > cap-bytes [
new-error 'build-data-code-words 'res-len reduce [res-len cap-bytes]
]
if res-len = cap-bytes [return res]
pad-index: 1
loop cap-bytes - res-len [
append res padding-bin/(pad-index)
either pad-index = 1 [
pad-index: 2
][
pad-index: 1
]
]
res
]
build-code-words-with-ecc: function [
data [binary!]
modules-bits [integer!]
num-blocks [integer!]
block-ecc-bytes [integer!]
cap-bytes [integer!]
][
modules-bytes: modules-bits / 8
num-short-blocks: num-blocks - (modules-bytes % num-blocks)
short-block-data-len: modules-bytes / num-blocks - block-ecc-bytes
res: make binary! modules-bytes
append/dup res 0 modules-bytes
generator: calc-reed-solomon-generator block-ecc-bytes
dat: data
i: 1
while [i <= num-blocks][
dlen: short-block-data-len + either i <= num-short-blocks [0][1]
ecc: calc-reed-solomon-remainder dat dlen generator
j: 1 k: i
while [j <= dlen][
if j = (short-block-data-len + 1) [
k: k - num-short-blocks
]
res/(k): dat/(j)
j: j + 1
k: k + num-blocks
]
j: 1 k: cap-bytes + i
while [j <= block-ecc-bytes][
res/(k): ecc/(j)
j: j + 1
k: k + num-blocks
]
dat: skip dat dlen
i: i + 1
]
res
]
calc-reed-solomon-generator: function [degree [integer!]][
unless all [
degree >= 1
degree <= REED_SOLOMON_DEGREE_MAX
][new-error 'calc-reed-solomon-generator 'degree degree]
res: make binary! degree
append/dup res 0 degree
res/(degree): 1
root: 1
i: 1
while [i <= degree][
j: 1
while [j <= degree][
res/(j): finite-field-multiply res/(j) root
if j < degree [
res/(j): res/(j) xor res/(j + 1)
]
j: j + 1
]
root: finite-field-multiply root 2
i: i + 1
]
res
]
calc-reed-solomon-remainder: function [data [binary!] data-len [integer!] generator [binary!]][
degree: length? generator
unless all [
degree >= 1
degree <= REED_SOLOMON_DEGREE_MAX
][new-error 'calc-reed-solomon-remainder 'degree degree]
res: make binary! degree
append/dup res 0 degree
i: 1
while [i <= data-len][
factor: data/(i) xor res/1
res: skip res 1
append res 0
j: 1
while [j <= degree][
res/(j): res/(j) xor finite-field-multiply generator/(j) factor
j: j + 1
]
i: i + 1
]
res
]
finite-field-multiply: function [x [integer!] y [integer!]][
z: 0
i: 7
while [i >= 0][
z: (z << 1 and FFh) xor ((z >> 7) * 011Dh and FFh)
z: z xor ((y >> i and 1) * x)
i: i - 1
]
z and FFh
]
total-bits: function [
segs [block!]
version [integer!]
][
res: 0
forall segs [
num-chars: segs/1/num-chars
bit-len: length? segs/1/data
unless cc-bits: num-char-bits segs/1/mode version [
return none
]
if num-chars >= (1 << cc-bits) [
return none
]
res: res + 4 + cc-bits + bit-len
if res > 32767 [return none]
]
res
]
num-char-bits: function [
mode [word!]
ver [integer!]
][
if mode = 'number [
if ver <= 9 [return 10]
if ver <= 26 [return 12]
if ver <= 40 [return 14]
return none
]
if mode = 'alphanumber [
if ver <= 9 [return 9]
if ver <= 26 [return 11]
if ver <= 40 [return 13]
return none
]
if mode = 'byte [
if ver <= 9 [return 8]
if ver <= 26 [return 16]
if ver <= 40 [return 16]
return none
]
if mode = 'kanji [
if ver <= 9 [return 8]
if ver <= 26 [return 10]
if ver <= 40 [return 12]
return none
]
none
]
init-func-modules: function [version [integer!]][
qrsize: version * 4 + 17
len: qrsize * qrsize
data: make string! len
append/dup data "0" len
img: reduce [qrsize data]
;-- timing patterns
fill-rect 6 0 1 qrsize img
fill-rect 0 6 qrsize 1 img
;-- finder patterns
fill-rect 0 0 9 9 img
fill-rect qrsize - 8 0 8 9 img
fill-rect 0 qrsize - 8 9 8 img
aligns: get-align-pattern-pos version
num-align: either aligns [length? aligns][0]
i: 0
while [i < num-align][
j: 0
while [j < num-align][
unless any [
all [
i = 0
j = 0
]
all [
i = 0
j = (num-align - 1)
]
all [
i = (num-align - 1)
j = 0
]
][
fill-rect aligns/(i + 1) - 2 aligns/(j + 1) - 2 5 5 img
]
j: j + 1
]
i: i + 1
]
;-- version block
if version >= 7 [
fill-rect qrsize - 11 0 3 6 img
fill-rect 0 qrsize - 11 6 3 img
]
img
]
get-module: function [img [block!] x [integer!] y [integer!]][
qrsize: img/1
data: img/2
index: y * qrsize + x + 1
data/(index) = #"1"
]
get-bit: function [x [integer!] i [integer!]][
(x >> i and 1) <> 0
]
set-module: function [img [block!] x [integer!] y [integer!] black? [logic!]][
qrsize: img/1
data: img/2
index: y * qrsize + x + 1
data/(index): either black? [#"1"][#"0"]
]
set-module-bounded: function [img [block!] x [integer!] y [integer!] black? [logic!]][
qrsize: img/1
if all [
x >= 0
x < qrsize
y >= 0
y < qrsize
][
set-module img x y black?
]
]
fill-rect: function [
left [integer!]
top [integer!]
width [integer!]
heigth [integer!]
img [block!]
][
dy: 0
while [dy < heigth][
dx: 0
while [dx < width][
set-module img left + dx top + dy true
dx: dx + 1
]
dy: dy + 1
]
]
get-align-pattern-pos: function [version [integer!]][
if version = 1 [return none]
num-align: version / 7 + 2
res: make binary! num-align
append/dup res 0 num-align
step: either version = 32 [26][
(version * 4 + (num-align * 2) + 1) / (num-align * 2 - 2) * 2
]
i: num-align - 1
pos: version * 4 + 10
while [i >= 1][
res/(i + 1): pos
i: i - 1
pos: pos - step
]
res/1: 6
res
]
draw-code-words: function [code-words [string!] img [block!]][
qrsize: img/1
len: length? code-words
i: 0
right: qrsize - 1
while [right >= 1][
if right = 6 [right: 5]
vert: 0
while [vert < qrsize][
j: 0
while [j < 2][
x: right - j
upward: (right + 1 and 2) = 0
y: either upward [qrsize - 1 - vert][vert]
if all [
not get-module img x y
i < (len * 8)
][
set-module img x y code-words/(i + 1) = #"1"
i: i + 1
]
j: j + 1
]
vert: vert + 1
]
right: right - 2
]
]
draw-white-func-modules: function [img [block!] version [integer!]][
qrsize: img/1
i: 7
;-- timing patterns
while [i < (qrsize - 7)][
set-module img 6 i false
set-module img i 6 false
i: i + 2
]
;-- finder patterns
dy: -4
while [dy <= 4][
dx: -4
while [dx <= 4][
dist: absolute dx
if (absolute dy) > dist [
dist: absolute dy
]
if any [
dist = 2
dist = 4
][
set-module-bounded img 3 + dx 3 + dy false
set-module-bounded img qrsize - 4 + dx 3 + dy false
set-module-bounded img 3 + dx qrsize - 4 + dy false
]
dx: dx + 1
]
dy: dy + 1
]
;-- align patterns
aligns: get-align-pattern-pos version
num-align: either aligns [length? aligns][0]
i: 0
while [i < num-align][
j: 0
while [j < num-align][
if any [
all [
i = 0
j = 0
]
all [
i = 0
j = (num-align - 1)
]
all [
i = (num-align - 1)
j = 0
]
][
j: j + 1
continue
]
dy: -1
while [dy <= 1][
dx: -1
while [dx <= 1][
black?: either all [dx = 0 dy = 0][true][false]
set-module img aligns/(i + 1) + dx aligns/(j + 1) + dy black?
dx: dx + 1
]
dy: dy + 1
]
j: j + 1
]
i: i + 1
]
;-- version blocks
if version >= 7 [
rem: version
i: 0
while [i < 12][
rem: (rem << 1) xor (rem >> 11 * 1F25h)
i: i + 1
]
bits: version << 12 or rem
i: 0
while [i < 6][
j: 0
while [j < 3][
k: qrsize - 11 + j
black?: (bits and 1) <> 0
set-module img k i black?
set-module img i k black?
bits: bits >> 1
j: j + 1
]
i: i + 1
]
]
]
apply-mask: function [mask-img [block!] img [block!] mask [integer!]][
qrsize: img/1
y: 0
while [y < qrsize][
x: 0
while [x < qrsize][
if get-module mask-img x y [x: x + 1 continue]
invert: true
switch mask [
0 [invert: (x + y % 2) = 0]
1 [invert: (y % 2) = 0]
2 [invert: (x % 3) = 0]
3 [invert: (x + y % 3) = 0]
4 [invert: (x / 3 + (y / 2) % 2) = 0]
5 [invert: (x * y % 2 + (x * y % 3)) = 0]
6 [invert: (x * y % 2 + (x * y % 3) % 2) = 0]
7 [invert: (x + y % 2 + (x * y % 3) % 2) = 0]
]
val: get-module img x y
set-module img x y val xor invert
x: x + 1
]
y: y + 1
]
]
draw-format-bits: function [ecl [word!] mask [integer!] img [block!]][
table: [L 1 M 0 Q 3 H 2]
data: table/(ecl) << 3 or mask
rem: data
loop 10 [
rem: (rem << 1) xor (rem >> 9 * 0537h)
]
bits: (data << 10 or rem) xor 5412h
i: 0
while [i <= 5][
set-module img 8 i get-bit bits i
i: i + 1
]
set-module img 8 7 get-bit bits 6
set-module img 8 8 get-bit bits 7
set-module img 7 8 get-bit bits 8
i: 9
while [i < 15][
set-module img 14 - i 8 get-bit bits i
i: i + 1
]
qrsize: img/1
i: 0
while [i < 8][
set-module img qrsize - 1 - i 8 get-bit bits i
i: i + 1
]
i: 8
while [i < 15][
set-module img 8 qrsize - 15 + i get-bit bits i
i: i + 1
]
set-module img 8 qrsize - 8 true
]
PENALTY_N1: 3
PENALTY_N2: 3
PENALTY_N3: 40
PENALTY_N4: 10
get-penalty-score: function [img [block!]][
qrsize: img/1
res: 0.0
y: 0
run-history: make binary! 7
append/dup run-history 0 7
while [y < qrsize][
hist: run-history
loop 7 [
hist/1: 0
hist: next hist
]
color: false
run-x: 0
x: 0
while [x < qrsize][
either color = get-module img x y [
run-x: run-x + 1
either run-x = 5 [
res: res + PENALTY_N1
][
if run-x > 5 [
res: res + 1
]
]
][
add-run-to-history run-x run-history
if all [
not color
has-finder-like-pattern run-history
][
res: res + PENALTY_N3
]
color: get-module img x y
run-x: 1
]
x: x + 1
]
add-run-to-history run-x run-history
if color [
add-run-to-history 0 run-history
]
if has-finder-like-pattern run-history [
res: res + PENALTY_N3
]
y: y + 1
]
x: 0
while [x < qrsize][
hist: run-history
loop 7 [
hist/1: 0
hist: next hist
]
color: false
run-y: 0
y: 0
while [y < qrsize][
either color = get-module img x y [
run-y: run-y + 1
either run-y = 5 [
res: res + PENALTY_N1
][
if run-y > 5 [
res: res + 1
]
]
][
add-run-to-history run-y run-history
if all [
not color
has-finder-like-pattern run-history
][
res: res + PENALTY_N3
]
color: get-module img x y
run-y: 1
]
y: y + 1
]
add-run-to-history run-y run-history
if color [
add-run-to-history 0 run-history
]
if has-finder-like-pattern run-history [
res: res + PENALTY_N3
]
x: x + 1
]
y: 0
while [y < (qrsize - 1)][
x: 0
while [x < (qrsize - 1)][