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package pngmeta
import (
"bytes"
"gf-lt/models"
"encoding/base64"
"encoding/binary"
"encoding/json"
"errors"
"fmt"
"image"
"image/color"
"image/png"
"io"
"os"
"path/filepath"
"testing"
)
func TestReadMeta(t *testing.T) {
cases := []struct {
Filename string
}{
{
Filename: "../sysprompts/llama.png",
},
}
for i, tc := range cases {
t.Run(fmt.Sprintf("test_%d", i), func(t *testing.T) {
// Call the readMeta function
pembed, err := extractChar(tc.Filename)
if err != nil {
t.Errorf("Expected no error, but got %v", err)
}
v, err := pembed.GetDecodedValue()
if err != nil {
t.Errorf("Expected no error, but got %v\n", err)
}
fmt.Printf("%+v\n", v.Simplify("Adam", tc.Filename))
})
}
}
// Test helper: Create a simple PNG image with test shapes
func createTestImage(t *testing.T) string {
img := image.NewRGBA(image.Rect(0, 0, 200, 200))
// Fill background with white
for y := 0; y < 200; y++ {
for x := 0; x < 200; x++ {
img.Set(x, y, color.White)
}
}
// Draw a red square
for y := 50; y < 150; y++ {
for x := 50; x < 150; x++ {
img.Set(x, y, color.RGBA{R: 255, A: 255})
}
}
// Draw a blue circle
center := image.Point{100, 100}
radius := 40
for y := center.Y - radius; y <= center.Y+radius; y++ {
for x := center.X - radius; x <= center.X+radius; x++ {
dx := x - center.X
dy := y - center.Y
if dx*dx+dy*dy <= radius*radius {
img.Set(x, y, color.RGBA{B: 255, A: 255})
}
}
}
// Create temp file
tmpDir := t.TempDir()
fpath := filepath.Join(tmpDir, "test-image.png")
f, err := os.Create(fpath)
if err != nil {
t.Fatalf("Error creating temp file: %v", err)
}
defer f.Close()
if err := png.Encode(f, img); err != nil {
t.Fatalf("Error encoding PNG: %v", err)
}
return fpath
}
func TestWriteToPng(t *testing.T) {
// Create test image
srcPath := createTestImage(t)
dstPath := filepath.Join(filepath.Dir(srcPath), "output.png")
// dstPath := "test.png"
// Create test metadata
metadata := &models.CharCardSpec{
Description: "Test image containing a red square and blue circle on white background",
}
// Embed metadata
if err := WriteToPng(metadata, srcPath, dstPath); err != nil {
t.Fatalf("WriteToPng failed: %v", err)
}
// Verify output file exists
if _, err := os.Stat(dstPath); os.IsNotExist(err) {
t.Fatalf("Output file not created: %v", err)
}
// Read and verify metadata
t.Run("VerifyMetadata", func(t *testing.T) {
data, err := os.ReadFile(dstPath)
if err != nil {
t.Fatalf("Error reading output file: %v", err)
}
// Verify PNG header
if string(data[:8]) != pngHeader {
t.Errorf("Invalid PNG header")
}
// Extract metadata
embedded := extractMetadata(t, data)
if embedded.Description != metadata.Description {
t.Errorf("Metadata mismatch\nWant: %q\nGot: %q",
metadata.Description, embedded.Description)
}
})
// Optional: Add cleanup if needed
// t.Cleanup(func() {
// os.Remove(dstPath)
// })
}
// Helper to extract embedded metadata from PNG bytes
func extractMetadata(t *testing.T, data []byte) *models.CharCardSpec {
r := bytes.NewReader(data[8:]) // Skip PNG header
for {
var length uint32
if err := binary.Read(r, binary.BigEndian, &length); err != nil {
if errors.Is(err, io.EOF) {
break
}
t.Fatalf("Error reading chunk length: %v", err)
}
chunkType := make([]byte, 4)
if _, err := r.Read(chunkType); err != nil {
t.Fatalf("Error reading chunk type: %v", err)
}
// Read chunk data
chunkData := make([]byte, length)
if _, err := r.Read(chunkData); err != nil {
t.Fatalf("Error reading chunk data: %v", err)
}
// Read and discard CRC
if _, err := r.Read(make([]byte, 4)); err != nil {
t.Fatalf("Error reading CRC: %v", err)
}
if string(chunkType) == embType {
parts := bytes.SplitN(chunkData, []byte{0}, 2)
if len(parts) != 2 {
t.Fatalf("Invalid tEXt chunk format")
}
decoded, err := base64.StdEncoding.DecodeString(string(parts[1]))
if err != nil {
t.Fatalf("Base64 decode error: %v", err)
}
var result models.CharCardSpec
if err := json.Unmarshal(decoded, &result); err != nil {
t.Fatalf("JSON unmarshal error: %v", err)
}
return &result
}
}
t.Fatal("Metadata not found in PNG")
return nil
}
func readTextChunk(t *testing.T, r io.ReadSeeker) *models.CharCardSpec {
var length uint32
binary.Read(r, binary.BigEndian, &length)
chunkType := make([]byte, 4)
r.Read(chunkType)
data := make([]byte, length)
r.Read(data)
// Read CRC (but skip validation for test purposes)
crc := make([]byte, 4)
r.Read(crc)
parts := bytes.SplitN(data, []byte{0}, 2) // Split key-value pair
if len(parts) != 2 {
t.Fatalf("Invalid tEXt chunk format")
}
// key := string(parts[0])
value := parts[1]
decoded, err := base64.StdEncoding.DecodeString(string(value))
if err != nil {
t.Fatalf("Base64 decode error: %v; value: %s", err, string(value))
}
var result models.CharCardSpec
if err := json.Unmarshal(decoded, &result); err != nil {
t.Fatalf("JSON unmarshal error: %v", err)
}
return &result
}
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