added a better version of pdfcompress that doesn't use convert

README.md

@@ -6,6 +6,10 @@
 
     With the verbose option this will also print processing information and the estimated remaining time.
 
+- [`pdfcompress2`](./bin/pdfcompress2)
+
+    Variant of the previous command that uses `poppler` utils and `gs` instead of convert that is old and buggy (this was acually manually modified)
+
 - [`hash2addr`](./bin/hash2addr)
 
     Outputs a randomly generated IP address and port number based on the MD5 hash of the input string.

bin/pdfcompress

@@ -76,7 +76,10 @@ start=$(date +%s.%N)
 for i in $(seq 0 $((page_count-1))); do
     iter_start=$(date +%s.%N)
 
-    convert -density 300 -quality "$quality" "${input_file}[$i]" "$temp_pages_dir/$i.jpg"
+    # convert -density 300 -quality "$quality" "${input_file}[$i]" "$temp_pages_dir/$i.jpg"
+    
+    # Equivalent "gs" command that avoids convert's security policies  
+    gs -sDEVICE=jpeg -o "$temp_pages_dir/$i.jpg" -dFirstPage="$i" -dLastPage="$i" -dJPEGQ="$quality" -r300x300 "$input_file"
 
     # Compute estimated remaining time
     end=$(date +%s.%N)

bin/pdfcompress2

@@ -0,0 +1,81 @@
+#!/bin/bash
+
+set -euo pipefail
+
+help_message="$(cat <<END
+usage: $(basename "$0") [OPTIONS...] INPUT_PDF OUTPUT_PDF
+
+Converts a PDF file to a series of JPEG images using convert to reduce the quality 
+and then merges back the result in a single pdf 
+
+Options:
+    -q, --quality    Set the JPEG quality (default: 75)
+    -v, --verbose    Enable verbose output, also shows an estimate of remaining time
+    -h, --help       Display this help message
+
+END
+)"
+
+function show_usage() {
+    echo "$help_message"
+    exit 1
+}
+
+quality=75
+verbose=false
+
+while [[ $# -gt 0 ]]
+do
+    key="$1"
+
+    case $key in
+        -q|--quality)
+            quality="$2"
+            shift # past argument
+            shift # past value
+            ;;
+        -v|--verbose)
+            verbose=true
+            shift # past argument
+            ;;
+        -h|--help)
+            show_usage
+            ;;
+        -*)
+            echo "Unknown option: $key"
+            show_usage
+            ;;
+        *)
+            break
+            ;;
+    esac
+done
+
+if [ -z "$1" ] || [ -z "$2" ]; then
+    show_usage
+fi
+
+input_file="$1"
+output_file="$2"
+
+temp_pages_dir="$(mktemp -d)"
+
+function logf {
+    if [ "$verbose" = true ]; then
+        printf "$@"
+    fi
+}
+
+logf "Rendering each page to a jpeg image (quality = $quality%)\n"
+pdftoppm -r 300 -jpeg -jpegopt "quality=$quality,optimize=y" -progress $input_file "$temp_pages_dir/page"
+
+for f in *.jpg; do
+    log "Wrapping $f into ${f/.jpg/.pdf}\n"
+    gs -dNOSAFER  -sDEVICE=pdfwrite -o "${f/.jpg/.pdf}" /usr/share/ghostscript/lib/viewjpeg.ps -c "($f)" viewJPEG
+done
+
+logf "Merging compressed pages to a single PDF ()\n"
+pdfunite "$temp_pages_dir"/page*.pdf $output_file
+
+rm -r "$temp_pages_dir"
+logf "Done\n"