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version.go
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version.go
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package qrcode
import (
"errors"
"log"
"strconv"
// "github.com/skip2/go-qrcode/bitset"
"github.com/yeqown/reedsolomon/binary"
)
// ecLevel error correction level
type ecLevel int
const (
// ErrorCorrectionLow :Level L: 7% error recovery.
ErrorCorrectionLow ecLevel = iota + 1
// ErrorCorrectionMedium :Level M: 15% error recovery. Good default choice.
ErrorCorrectionMedium
// ErrorCorrectionQuart :Level Q: 25% error recovery.
ErrorCorrectionQuart
// ErrorCorrectionHighest :Level H: 30% error recovery.
ErrorCorrectionHighest
formatInfoBitsNum = 15 // format info bits num
verInfoBitsNum = 18 // version info length bits num
)
var (
errInvalidErrorCorrectionLevel = errors.New("invalid error correction level")
errAnalyzeVersionFailed = errors.New("could not match version! " +
"check your content length is in limitation of encode mode and error correction level")
errMissMatchedVersion = errors.New("could not match version")
errMissMatchedEncodeType = errors.New("could not match the encode type")
// versions []version
// Each QR Code contains a 15-bit Format Information qrbool. The 15 bits
// consist of 5 data bits concatenated with 10 error correction bits.
//
// The 5 data bits consist of:
// - 2 bits for the error correction level (L=01, M=00, G=11, H=10).
// - 3 bits for the data mask pattern identifier.
//
// formatBitSequence is a mapping from the 5 data bits to the completed 15-bit
// Format Information qrbool.
//
// For example, a QR Code using error correction level L, and data mask
// pattern identifier 001:
//
// 01 | 001 = 01001 = 0x9
// formatBitSequence[0x9].qrCode = 0x72f3 = 111001011110011
formatBitSequence = []struct {
regular uint32
micro uint32
}{
{0x5412, 0x4445}, {0x5125, 0x4172}, {0x5e7c, 0x4e2b}, {0x5b4b, 0x4b1c},
{0x45f9, 0x55ae}, {0x40ce, 0x5099}, {0x4f97, 0x5fc0}, {0x4aa0, 0x5af7},
{0x77c4, 0x6793}, {0x72f3, 0x62a4}, {0x7daa, 0x6dfd}, {0x789d, 0x68ca},
{0x662f, 0x7678}, {0x6318, 0x734f}, {0x6c41, 0x7c16}, {0x6976, 0x7921},
{0x1689, 0x06de}, {0x13be, 0x03e9}, {0x1ce7, 0x0cb0}, {0x19d0, 0x0987},
{0x0762, 0x1735}, {0x0255, 0x1202}, {0x0d0c, 0x1d5b}, {0x083b, 0x186c},
{0x355f, 0x2508}, {0x3068, 0x203f}, {0x3f31, 0x2f66}, {0x3a06, 0x2a51},
{0x24b4, 0x34e3}, {0x2183, 0x31d4}, {0x2eda, 0x3e8d}, {0x2bed, 0x3bba},
}
// QR Codes version 7 and higher contain an 18-bit version Information qrbool,
// consisting of a 6 data bits and 12 error correction bits.
//
// versionBitSequence is a mapping from QR Code version to the completed
// 18-bit version Information qrbool.
//
// For example, a QR code of version 7:
// versionBitSequence[0x7] = 0x07c94 = 000111110010010100
versionBitSequence = []uint32{
0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x07c94,
0x085bc, 0x09a99, 0x0a4d3, 0x0bbf6, 0x0c762, 0x0d847, 0x0e60d, 0x0f928,
0x10b78, 0x1145d, 0x12a17, 0x13532, 0x149a6, 0x15683, 0x168c9, 0x177ec,
0x18ec4, 0x191e1, 0x1afab, 0x1b08e, 0x1cc1a, 0x1d33f, 0x1ed75, 0x1f250,
0x209d5, 0x216f0, 0x228ba, 0x2379f, 0x24b0b, 0x2542e, 0x26a64, 0x27541, 0x28c69,
}
)
// capacity struct includes data type max capacity
type capacity struct {
Numeric int `json:"n"` // num capacity
AlphaNumeric int `json:"a"` // char capacity
Byte int `json:"b"` // byte capacity (utf-8 also)
JP int `json:"j"` // Japanese capacity
}
// group contains fields to generate ECBlocks
// and append _defaultPadding bit
type group struct {
// NumBlocks num of blocks
NumBlocks int `json:"nbs"`
// NumDataCodewords Number of data codewords.
NumDataCodewords int `json:"ndcs"`
// ECBlockwordsPerBlock ...
ECBlockwordsPerBlock int `json:"ecbs_pb"`
}
// version ...
type version struct {
// version code 1-40
Ver int `json:"ver"`
// ECLevel error correction 0, 1, 2, 3
ECLevel ecLevel `json:"eclv"`
// Cap includes each type's max capacity (specified by `Ver` and `ecLevel`)
// ref to: https://www.thonky.com/qr-code-tutorial/character-capacities
Cap capacity `json:"cap"`
// RemainderBits remainder bits need to append finally
RemainderBits int `json:"rembits"`
// groups info to generate
// ref to: https://www.thonky.com/qr-code-tutorial/error-correction-table
// numGroup = len(Groups)
Groups []group `json:"groups"`
}
// Dimension ...
func (v version) Dimension() int {
return v.Ver*4 + 17
}
// NumTotalCodewords total data codewords
func (v version) NumTotalCodewords() int {
var total int
for _, g := range v.Groups {
total = total + (g.NumBlocks * g.NumDataCodewords)
}
return total
}
// NumGroups ... need group num. ref to version config file
func (v version) NumGroups() int {
return len(v.Groups)
}
// TotalNumBlocks ... total data blocks num, ref to version config file
func (v version) TotalNumBlocks() int {
var total int
for _, g := range v.Groups {
total = total + g.NumBlocks
}
return total
}
// VerInfo version info bitset
func (v version) verInfo() *binary.Binary {
if v.Ver < 7 {
return nil
}
result := binary.New()
result.AppendUint32(versionBitSequence[v.Ver], verInfoBitsNum)
return result
}
// formatInfo returns the 15-bit Format Information qrbool for a QR
// code.
func (v version) formatInfo(maskPattern int) *binary.Binary {
formatID := 0
switch v.ECLevel {
case ErrorCorrectionLow:
formatID = 0x08 // 0b01000
case ErrorCorrectionMedium:
formatID = 0x00 // 0b00000
case ErrorCorrectionQuart:
formatID = 0x18 // 0b11000
case ErrorCorrectionHighest:
formatID = 0x10 // 0b10000
default:
log.Panicf("Invalid level %d", v.ECLevel)
}
if maskPattern < 0 || maskPattern > 7 {
log.Panicf("Invalid maskPattern %d", maskPattern)
}
formatID |= maskPattern & 0x7
result := binary.New()
result.AppendUint32(formatBitSequence[formatID].regular, formatInfoBitsNum)
return result
}
var emptyVersion = version{Ver: -1}
// binarySearchVersion speed up searching target version in versions.
// low, high to set the left and right bound of the search range (min:0 to max:159).
// compare represents the function to compare the target version with the cursor version.
// negative means lower direction, positive means higher direction, zero mean hit.
func binarySearchVersion(low, high int, compare func(*version) int) (hit version, found bool) {
// left low and high in a valid range
if low > high || low > _VERSIONS_ITEM_COUNT || high < 0 {
return emptyVersion, false
}
if low < 0 {
low = 0
}
if high >= _VERSIONS_ITEM_COUNT {
high = len(versions) - 1
}
for low <= high {
mid := (low + high) / 2
r := compare(&versions[mid])
if r == 0 {
hit = versions[mid]
found = true
break
}
if r > 0 {
// move toward higher direction
low = mid + 1
} else {
// move toward lower direction
high = mid
}
}
return hit, found
}
// defaultBinaryCompare built-in compare function for binary search.
func defaultBinaryCompare(ver int, ec ecLevel) func(cursor *version) int {
return func(cursor *version) int {
switch r := ver - cursor.Ver; r {
case 0:
default:
// v is bigger return positive; otherwise return negative.
return r
}
return int(ec - cursor.ECLevel)
}
}
// loadVersion get version config by specified version indicator and error correction level.
// we can speed up this process, by shrink the range to search.
func loadVersion(lv int, ec ecLevel) version {
// each version only has 4 items in versions array,
// and them are ordered[ASC] already.
high := lv*4 - 1
low := (lv - 1) * 4
for i := low; i <= high; i++ {
if versions[i].ECLevel == ec {
return versions[i]
}
}
panic(errMissMatchedVersion)
}
// analyzeVersion the raw text, and then decide which version should be chosen
// according to the text length , error correction level and encode mode to choose the
// closest capacity of version.
//
// check out http://muyuchengfeng.xyz/%E4%BA%8C%E7%BB%B4%E7%A0%81-%E5%AD%97%E7%AC%A6%E5%AE%B9%E9%87%8F%E8%A1%A8/
// for more details.
func analyzeVersion(raw []byte, ec ecLevel, mode encMode) (*version, error) {
step := 0
switch ec {
case ErrorCorrectionLow:
step = 0
case ErrorCorrectionMedium:
step = 1
case ErrorCorrectionQuart:
step = 2
case ErrorCorrectionHighest:
step = 3
default:
return nil, errInvalidErrorCorrectionLevel
}
want, mark := len(raw), 0
for ; step < 160; step += 4 {
switch mode {
case EncModeNumeric:
mark = versions[step].Cap.Numeric
case EncModeAlphanumeric:
mark = versions[step].Cap.AlphaNumeric
case EncModeByte:
mark = versions[step].Cap.Byte
case EncModeJP:
mark = versions[step].Cap.JP
default:
return nil, errMissMatchedEncodeType
}
if mark >= want {
return &versions[step], nil
}
}
debugLogf("mismatched version, version's length: %d, ec: %v", len(versions), ec)
return nil, errAnalyzeVersionFailed
}
var (
// https://www.thonky.com/qr-code-tutorial/alignment-pattern-locations
// DONE(@yeqown): add more version
alignPatternLocation = map[int][]int{
2: {6, 18},
3: {6, 22},
4: {6, 26},
5: {6, 30},
6: {6, 34},
7: {6, 22, 38},
8: {6, 24, 42},
9: {6, 26, 46},
10: {6, 28, 50},
11: {6, 30, 54},
12: {6, 32, 58},
13: {6, 34, 62},
14: {6, 26, 46, 66},
15: {6, 26, 48, 70},
16: {6, 26, 50, 74},
17: {6, 30, 54, 78},
18: {6, 30, 56, 82},
19: {6, 30, 58, 86},
20: {6, 34, 62, 90},
21: {6, 28, 50, 72, 94},
22: {6, 26, 50, 74, 98},
23: {6, 30, 54, 78, 102},
24: {6, 28, 54, 80, 106},
25: {6, 32, 58, 84, 110},
26: {6, 30, 58, 86, 114},
27: {6, 34, 62, 90, 118},
28: {6, 26, 50, 74, 98, 122},
29: {6, 30, 54, 78, 102, 126},
30: {6, 26, 52, 78, 104, 130},
31: {6, 30, 56, 82, 108, 134},
32: {6, 34, 60, 86, 112, 138},
33: {6, 30, 58, 86, 114, 142},
34: {6, 34, 62, 90, 118, 146},
35: {6, 30, 54, 78, 102, 126, 150},
36: {6, 24, 50, 76, 102, 128, 154},
37: {6, 28, 54, 80, 106, 132, 158},
38: {6, 32, 58, 84, 110, 136, 162},
39: {6, 26, 54, 82, 110, 138, 166},
40: {6, 30, 58, 86, 114, 142, 170},
}
alignPatternCache = map[int][]loc{}
)
// loc point position(x,y)
type loc struct {
X int // for width
Y int // for height
}
// loadAlignmentPatternLoc ...
func loadAlignmentPatternLoc(ver int) (locs []loc) {
if ver < 2 {
return
}
var ok bool
if locs, ok = alignPatternCache[ver]; ok {
return
}
dimension := ver*4 + 17
positions, ok := alignPatternLocation[ver]
if !ok {
panic("could not found align at version: " + strconv.Itoa(ver))
}
for _, pos1 := range positions {
for _, pos2 := range positions {
if !valid(pos1, pos2, dimension) {
continue
}
locs = append(locs, loc{X: pos1, Y: pos2})
}
}
alignPatternCache[ver] = locs
return
}
// x, y center position x,y so
func valid(x, y, dimension int) bool {
// valid left-top
if (x-2) < 7 && (y-2) < 7 {
return false
}
// valid right-top
if (x+2) > dimension-7 && (y-2) < 7 {
return false
}
// valid left-bottom
if (x-2) < 7 && (y+2) > dimension-7 {
return false
}
return true
}