1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
package pngmeta
import (
"bytes"
"elefant/models"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"log/slog"
"os"
"path"
"strings"
)
const (
embType = "tEXt"
cKey = "chara"
IEND = "IEND"
header = "\x89PNG\r\n\x1a\n"
writeHeader = "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A"
)
var tEXtChunkDataSpecification = "%s\x00%s"
type PngEmbed struct {
Key string
Value string
}
func (c PngEmbed) GetDecodedValue() (*models.CharCardSpec, error) {
data, err := base64.StdEncoding.DecodeString(c.Value)
if err != nil {
return nil, err
}
card := &models.CharCardSpec{}
if err := json.Unmarshal(data, &card); err != nil {
return nil, err
}
specWrap := &models.Spec2Wrapper{}
if card.Name == "" {
if err := json.Unmarshal(data, &specWrap); err != nil {
return nil, err
}
return &specWrap.Data, nil
}
return card, nil
}
func extractChar(fname string) (*PngEmbed, error) {
data, err := os.ReadFile(fname)
if err != nil {
return nil, err
}
reader := bytes.NewReader(data)
pr, err := NewPNGStepReader(reader)
if err != nil {
return nil, err
}
for {
step, err := pr.Next()
if err != nil {
if errors.Is(err, io.EOF) {
break
}
}
if step.Type() != embType {
if _, err := io.Copy(io.Discard, step); err != nil {
return nil, err
}
} else {
buf, err := io.ReadAll(step)
if err != nil {
return nil, err
}
dataInstep := string(buf)
values := strings.Split(dataInstep, "\x00")
if len(values) == 2 {
return &PngEmbed{Key: values[0], Value: values[1]}, nil
}
}
if err := step.Close(); err != nil {
return nil, err
}
}
return nil, errors.New("failed to find embedded char in png: " + fname)
}
func ReadCard(fname, uname string) (*models.CharCard, error) {
pe, err := extractChar(fname)
if err != nil {
return nil, err
}
charSpec, err := pe.GetDecodedValue()
if err != nil {
return nil, err
}
if charSpec.Name == "" {
return nil, fmt.Errorf("failed to find role; fname %s\n", fname)
}
return charSpec.Simplify(uname, fname), nil
}
func readCardJson(fname string) (*models.CharCard, error) {
data, err := os.ReadFile(fname)
if err != nil {
return nil, err
}
card := models.CharCard{}
if err := json.Unmarshal(data, &card); err != nil {
return nil, err
}
return &card, nil
}
func ReadDirCards(dirname, uname string, log *slog.Logger) ([]*models.CharCard, error) {
files, err := os.ReadDir(dirname)
if err != nil {
return nil, err
}
resp := []*models.CharCard{}
for _, f := range files {
if f.IsDir() {
continue
}
if strings.HasSuffix(f.Name(), ".png") {
fpath := path.Join(dirname, f.Name())
cc, err := ReadCard(fpath, uname)
if err != nil {
log.Warn("failed to load card", "error", err)
continue
// return nil, err // better to log and continue
}
resp = append(resp, cc)
}
if strings.HasSuffix(f.Name(), ".json") {
fpath := path.Join(dirname, f.Name())
cc, err := readCardJson(fpath)
if err != nil {
return nil, err // better to log and continue
}
resp = append(resp, cc)
}
}
return resp, nil
}
|
