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feat(compress): add PDF linearization option using QPDF

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Signed-off-by: Balázs Szücs <bszucs1209@gmail.com>
This commit is contained in:
Balázs Szücs 2025-11-15 18:17:06 +01:00
parent 74223d69ad
commit 27c704951d
1 changed files with 40 additions and 0 deletions
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40
app/core/src/main/java/stirling/software/SPDF/controller/api/misc/CompressController.java
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@ -791,6 +791,16 @@ public class CompressController {
currentFile = originalFile; currentFile = originalFile;
} }
// Apply linearization as final step if requested
if (Boolean.TRUE.equals(request.getLinearize()) && isQpdfEnabled()) {
try {
applyLinearization(currentFile, tempFiles);
log.info("PDF linearization applied successfully");
} catch (IOException e) {
log.warn("PDF linearization failed, continuing without linearization", e);
}
}
String outputFilename = String outputFilename =
GeneralUtils.generateFilename( GeneralUtils.generateFilename(
inputFile.getOriginalFilename(), "_Optimized.pdf"); inputFile.getOriginalFilename(), "_Optimized.pdf");
@ -810,6 +820,36 @@ public class CompressController {
} }
} }
// Apply PDF linearization using QPDF
private void applyLinearization(Path currentFile, List<Path> tempFiles) throws IOException {
log.info("Applying PDF linearization to: {}", currentFile);
// Create output file for linearization
Path linearizedOutputFile = Files.createTempFile("linearized_output_", ".pdf");
tempFiles.add(linearizedOutputFile);
// Build QPDF command for linearization only
List<String> command = new ArrayList<>();
command.add("qpdf");
command.add("--linearize");
command.add(currentFile.toString());
command.add(linearizedOutputFile.toString());
try {
ProcessExecutorResult returnCode =
ProcessExecutor.getInstance(ProcessExecutor.Processes.QPDF)
.runCommandWithOutputHandling(command);
// Update current file to the linearized output
Files.copy(linearizedOutputFile, currentFile, StandardCopyOption.REPLACE_EXISTING);
log.info("PDF linearization completed successfully");
} catch (Exception e) {
log.warn("PDF linearization failed", e);
throw new IOException("PDF linearization failed", e);
}
}
// Run Ghostscript compression // Run Ghostscript compression
private void applyGhostscriptCompression( private void applyGhostscriptCompression(
OptimizePdfRequest request, int optimizeLevel, Path currentFile, List<Path> tempFiles) OptimizePdfRequest request, int optimizeLevel, Path currentFile, List<Path> tempFiles)