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feat: add safe string width calculation to handle unsupported characters in RedactController

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This commit is contained in:
Balázs Szücs 2025-07-12 13:29:29 +02:00
parent 72e34fbadd
commit 03093f50f6
1 changed files with 34 additions and 4 deletions
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38
stirling-pdf/src/main/java/stirling/software/SPDF/controller/api/security/RedactController.java
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@ -679,6 +679,36 @@ public class RedactController {
return result.toString();
}
/**
* Safely calculates the width of a string, handling characters that might not be supported by
* the font. If a character is not supported, it's replaced with a space or skipped.
*/
private float safeGetStringWidth(PDFont font, String text) throws IOException {
if (font == null || text == null || text.isEmpty()) {
return 0;
}
StringBuilder safeText = new StringBuilder();
for (int i = 0; i < text.length(); i++) {
char c = text.charAt(i);
try {
// Try to encode the character to check if it's supported
font.encode(String.valueOf(c));
safeText.append(c);
} catch (IllegalArgumentException e) {
// If the character is not supported, replace it with a space
// This is a simple fallback - you might want to use a different strategy
safeText.append(' ');
log.debug(
"Replaced unsupported character U+{} with space in font {}",
Integer.toHexString(c | 0x10000).substring(1),
font.getName());
}
}
return font.getStringWidth(safeText.toString());
}
private float calculateWidthAdjustment(TextSegment segment, List<MatchRange> matches)
throws IOException {
float totalOriginalWidth = 0;
@ -695,11 +725,11 @@ public class RedactController {
if (segment.getFont() != null) {
totalOriginalWidth +=
segment.getFont().getStringWidth(originalPart)
safeGetStringWidth(segment.getFont(), originalPart)
/ FONT_SCALE_FACTOR
* segment.getFontSize();
totalPlaceholderWidth +=
segment.getFont().getStringWidth(placeholderPart)
safeGetStringWidth(segment.getFont(), placeholderPart)
/ FONT_SCALE_FACTOR
* segment.getFontSize();
}
@ -806,11 +836,11 @@ public class RedactController {
if (modified && segment.getFont() != null && segment.getFontSize() > 0) {
float originalWidth =
segment.getFont().getStringWidth(originalText)
safeGetStringWidth(segment.getFont(), originalText)
/ FONT_SCALE_FACTOR
* segment.getFontSize();
float modifiedWidth =
segment.getFont().getStringWidth(modifiedString)
safeGetStringWidth(segment.getFont(), modifiedString)
/ FONT_SCALE_FACTOR
* segment.getFontSize();
float adjustment = originalWidth - modifiedWidth;