pdfer

A pure Go library for PDF processing with comprehensive XFA (XML Forms Architecture) support.

Features

Pure Go - No CGO, no external dependencies
Unified API - Clean parse.Open() entry point for all PDF operations
Unified Forms - Auto-detect and work with AcroForm or XFA forms
PDF Decryption - RC4 (40/128-bit) and AES (128/256-bit)
XFA Processing - Extract, parse, modify, and rebuild XFA forms
PDF Generation - Create PDFs from scratch with text, graphics, and images
Image Embedding - JPEG and PNG images with alpha channel support
Content Streams - Full text and graphics operators for page content
Object Streams - Full support for compressed object storage
Cross-Reference Streams - Parse modern PDF xref streams with predictor filters
Stream Filters - FlateDecode, ASCIIHexDecode, ASCII85Decode, RunLengthDecode
Incremental Updates - Parse PDFs with multiple revisions, follow /Prev chains
Byte-Perfect Parsing - Preserve exact bytes for reconstruction of original PDF
Structured Error Handling - Categorized error types with codes, context, and standard library compatibility
Warning System - Collect and manage non-fatal warnings during PDF processing
Cross-Reference Streams - Write modern compressed xref streams (PDF 1.5+) for smaller, more efficient PDFs
Object Streams - Compress objects into object streams (ObjStm) for significantly smaller file sizes
Bookmarks/Outlines - Create hierarchical document navigation with page destinations
Watermarks - Add text or image watermarks to pages with rotation, opacity, and positioning

Installation

go get github.com/benedoc-inc/pdfer

Quick Start

Open and Parse a PDF (Unified API)

import "github.com/benedoc-inc/pdfer/core/parse"

// Open a PDF
pdf, err := parse.Open(pdfBytes)
if err != nil {
    log.Fatal(err)
}

// Get basic info
log.Printf("Version: %s", pdf.Version())
log.Printf("Objects: %d", pdf.ObjectCount())
log.Printf("Revisions: %d", pdf.RevisionCount())

// Get an object
obj, err := pdf.GetObject(1)
if err != nil {
    log.Fatal(err)
}
log.Printf("Object 1: %s", string(obj))

// List all objects
for _, num := range pdf.Objects() {
    log.Printf("Object %d exists", num)
}

Open an Encrypted PDF

pdf, err := parse.OpenWithOptions(pdfBytes, parse.ParseOptions{
    Password: []byte("secret"),
    Verbose:  true,
})

Byte-Perfect PDF Parsing

// Parse preserving exact bytes for reconstruction
pdf, err := parser.OpenWithOptions(pdfBytes, parser.ParseOptions{
    BytePerfect: true,
})

// Reconstruct identical PDF
reconstructed := pdf.Bytes()
// bytes.Equal(reconstructed, pdfBytes) == true

// Access raw object data with byte offsets
rawObj, _ := pdf.GetRawObject(1)
log.Printf("Object at offset %d, raw bytes: %d", rawObj.Offset, len(rawObj.RawBytes))

Extract and Fill Forms (Unified Interface)

import "github.com/benedoc-inc/pdfer/forms"

// Auto-detect and extract any form type (AcroForm or XFA)
form, err := forms.Extract(pdfBytes, password, false)
if err != nil {
    log.Fatal(err)
}

// Work with unified interface
schema := form.Schema()
log.Printf("Form type: %s, Fields: %d", form.Type(), len(schema.Questions))

// Fill the form
formData := types.FormData{
    "FirstName": "John",
    "LastName":  "Doe",
}
filled, err := form.Fill(pdfBytes, formData, password, false)

Extract XFA from an Encrypted PDF

package main

import (
    "log"
    "os"

    "github.com/benedoc-inc/pdfer"
    "github.com/benedoc-inc/pdfer/core/encrypt"
    "github.com/benedoc-inc/pdfer/forms/xfa"
)

func main() {
    // Read PDF
    pdfBytes, _ := os.ReadFile("form.pdf")

    // Decrypt (empty password for many government forms)
    _, encryptInfo, err := encrypt.DecryptPDF(pdfBytes, []byte(""), false)
    if err != nil {
        log.Fatal(err)
    }

    // Extract XFA streams
    streams, err := xfa.ExtractAllXFAStreams(pdfBytes, encryptInfo, false)
    if err != nil {
        log.Fatal(err)
    }

    // Access template (form structure)
    log.Printf("Template: %d bytes", len(streams.Template.Data))
    
    // Access datasets (form data)
    log.Printf("Datasets: %d bytes", len(streams.Datasets.Data))
    
    // Use convenient type aliases from root package
    var form *pdfer.FormSchema
    form, _ = xfa.ParseXFAForm(string(streams.Template.Data), false)
    log.Printf("Found %d questions", len(form.Questions))
}

Parse XFA Form Structure

// Parse the template to get form fields
form, err := xfa.ParseXFAForm(string(streams.Template.Data), false)
if err != nil {
    log.Fatal(err)
}

log.Printf("Found %d questions", len(form.Questions))
for _, q := range form.Questions {
    log.Printf("  %s: %s (%s)", q.ID, q.Label, q.Type)
}

Update Form Field Values

// Create form data (using type alias from root package)
formData := pdfer.FormData{
    "FirstName": "John",
    "LastName":  "Doe",
    "Date":      "2024-01-15",
}

// Update XFA in PDF
updatedPDF, err := xfa.UpdateXFAInPDF(pdfBytes, formData, encryptInfo, false)
if err != nil {
    log.Fatal(err)
}

os.WriteFile("filled.pdf", updatedPDF, 0644)

Create a PDF from Scratch

import "github.com/benedoc-inc/pdfer/core/write"
import "github.com/benedoc-inc/pdfer/types"

// Create a simple PDF with text and graphics
builder := write.NewSimplePDFBuilder()

// Enable modern PDF features (PDF 1.5+)
builder.Writer().UseXRefStream(true)  // Compressed xref streams
builder.Writer().UseObjectStream(true) // Compress objects (requires xref streams)

// Set document metadata
metadata := &types.DocumentMetadata{
    Title:   "My Document",
    Author:  "John Doe",
    Subject: "Example PDF",
    Creator: "pdfer",
}
builder.Writer().SetMetadata(metadata)

// Add bookmarks for navigation
bookmarks := []types.Bookmark{
    {
        Title:      "Introduction",
        PageNumber: 1,
    },
    {
        Title:      "Chapter 1",
        PageNumber: 2,
        Children: []types.Bookmark{
            {Title: "Section 1.1", PageNumber: 2},
            {Title: "Section 1.2", PageNumber: 3},
        },
    },
}
builder.SetBookmarks(bookmarks)

// Add watermark to page
page.AddTextWatermark("DRAFT", 72, 45) // Text, font size, angle

// Or use full watermark options
watermarkOpts := &write.WatermarkOptions{
    Text:     "CONFIDENTIAL",
    FontSize: 60,
    Angle:    30,
    Opacity:  0.3,
    Color:    &write.Color{R: 1.0, G: 0, B: 0}, // Red
}
page.AddWatermark(watermarkOpts)

// Add encryption (optional)
userPassword := []byte("mypassword")
ownerPassword := []byte("ownerpassword")
builder.Writer().SetupEncryptionWithPasswords(userPassword, ownerPassword, -3904, true)

// Add a page
page := builder.AddPage(write.PageSizeLetter)

// Add a font and get its resource name
fontName := page.AddStandardFont("Helvetica")

// Draw content
page.Content().
    // Add text
    BeginText().
    SetFont(fontName, 24).
    SetTextPosition(72, 720).
    ShowText("Hello, PDF World!").
    EndText().
    // Draw a red rectangle
    SetFillColorRGB(1, 0, 0).
    Rectangle(72, 650, 200, 50).
    Fill()

builder.FinalizePage(page)

// Generate PDF bytes
pdfBytes, err := builder.Bytes()

Embed Images in a PDF

import "github.com/benedoc-inc/pdfer/core/write"

builder := write.NewSimplePDFBuilder()
page := builder.AddPage(write.PageSizeLetter)

// Add a JPEG image
jpegData, _ := os.ReadFile("photo.jpg")
imgInfo, err := builder.Writer().AddJPEGImage(jpegData, "Im1")
if err != nil {
    log.Fatal(err)
}

// Register image with page and draw it
imgName := page.AddImage(imgInfo)
page.Content().DrawImageAt(imgName, 72, 500, 200, 150)

builder.FinalizePage(page)
pdfBytes, _ := builder.Bytes()

Extract All Content from a PDF

import "github.com/benedoc-inc/pdfer/content/extract"

// Extract all content (text, graphics, images, fonts, annotations)
doc, err := extract.ExtractContent(pdfBytes, nil, false)
if err != nil {
    log.Fatal(err)
}

// Access extracted content
log.Printf("Pages: %d", len(doc.Pages))
for _, page := range doc.Pages {
    log.Printf("  Page %d: %d text elements, %d graphics, %d images",
        page.PageNumber, len(page.Text), len(page.Graphics), len(page.Images))
    
    // Text with positioning and font info
    for _, text := range page.Text {
        log.Printf("    Text: '%s' at (%.2f, %.2f) font: %s size: %.2f",
            text.Text, text.X, text.Y, text.FontName, text.FontSize)
    }
    
    // Resources (fonts, images)
    if page.Resources != nil {
        log.Printf("    Fonts: %d, Images: %d", 
            len(page.Resources.Fonts), len(page.Resources.Images))
    }
    
    // Annotations
    for _, annot := range page.Annotations {
        log.Printf("    Annotation: %s", annot.Type)
    }
}

// Extract as JSON
jsonStr, err := extract.ExtractContentToJSON(pdfBytes, nil, false)
if err != nil {
    log.Fatal(err)
}
log.Printf("JSON: %s", jsonStr)

// Extract all images with binary data
images, err := extract.ExtractAllImages(pdfBytes, nil, false)
if err != nil {
    log.Fatal(err)
}
for _, img := range images {
    log.Printf("Image: %s, %dx%d, Format: %s, Data: %d bytes", 
        img.ID, img.Width, img.Height, img.Format, len(img.Data))
    // Image binary data is in img.Data (and img.DataBase64 for JSON)
}

Extraction Flow:

ExtractContent()
  ├─→ ExtractMetadata() → Document info (title, author, dates)
  ├─→ ExtractPages() → For each page:
  │     ├─→ parseContentStream() → Text, graphics, image refs
  │     ├─→ extractResources() → Fonts, XObjects, images
  │     └─→ extractAnnotations() → Links, comments, highlights
  ├─→ ExtractBookmarks() → Document outline
  └─→ Aggregate → Unique fonts/images from all pages

Parse PDFs with Incremental Updates

import "github.com/benedoc-inc/pdfer/core/parse"

// Parse a PDF that has been edited multiple times
pdfBytes, _ := os.ReadFile("edited.pdf")

// Check how many revisions the PDF has
revisions := parse.CountRevisions(pdfBytes)
log.Printf("PDF has %d revisions", revisions)

// Parse all revisions and merge object tables
result, err := parser.ParseWithIncrementalUpdates(pdfBytes, false)
if err != nil {
    log.Fatal(err)
}

log.Printf("Found %d objects", len(result.Objects))

// Extract a specific revision (e.g., the original before edits)
originalPDF, _ := parse.ExtractRevision(pdfBytes, 1)

Byte-Perfect PDF Parsing

import "github.com/benedoc-inc/pdfer/core/parse"

// Parse PDF with full byte preservation
pdfBytes, _ := os.ReadFile("document.pdf")
doc, err := parser.ParsePDFDocument(pdfBytes)
if err != nil {
    log.Fatal(err)
}

// Access individual revisions and objects
log.Printf("PDF has %d revisions, %d objects", doc.RevisionCount(), doc.ObjectCount())

// Get raw bytes of any object
obj := doc.GetObject(1)
log.Printf("Object 1: %d bytes", len(obj.RawBytes))

// Stream objects have parsed components
if obj.IsStream {
    log.Printf("Dictionary: %s", string(obj.DictRaw))
    log.Printf("Stream data: %d bytes", len(obj.StreamRaw))
}

// Reconstruct the PDF (byte-identical to original)
reconstructed := doc.Bytes()
// reconstructed == pdfBytes

Build XFA PDF from XML Streams

builder := write.NewXFABuilder(false)

streams := []writer.XFAStreamData{
    {Name: "template", Data: templateXML, Compress: true},
    {Name: "datasets", Data: datasetsXML, Compress: true},
    {Name: "config", Data: configXML, Compress: true},
}

pdfBytes, err := builder.BuildFromXFA(streams)

Package Structure

github.com/benedoc-inc/pdfer/
├── pdfer.go         # Root package with type aliases
├── core/            # Foundation layer
│   ├── parse/       # PDF parsing (reading structure)
│   ├── write/       # PDF writing (creating/modifying)
│   └── encrypt/     # Encryption/decryption
├── forms/           # Form processing (unified domain)
│   ├── forms.go     # Unified form interface
│   ├── acroform/    # AcroForm implementation
│   └── xfa/         # XFA implementation
├── content/         # Content operations
│   └── extract/     # Content extraction
├── resources/       # Embeddable resources
│   └── font/        # Font embedding
├── types/           # Shared data structures
├── cmd/pdfer/       # CLI tool
└── examples/        # Usage examples

Type Aliases

For convenience, common types are re-exported from the root package:

import "github.com/benedoc-inc/pdfer"

var enc *pdfer.Encryption      // = types.PDFEncryption
var form *pdfer.FormSchema     // = types.FormSchema
var q pdfer.Question           // = types.Question
var data pdfer.FormData        // = types.FormData

Document Manipulation

The library provides comprehensive document manipulation capabilities:

import "github.com/benedoc-inc/pdfer/core/manipulate"

// Rotate pages
manipulator, _ := manipulate.NewPDFManipulator(pdfBytes, nil, false)
manipulator.RotatePage(1, 90)  // Rotate page 1 by 90 degrees
manipulator.RotateAllPages(180) // Rotate all pages by 180 degrees
rotatedPDF, _ := manipulator.Rebuild()

// Delete pages
manipulator, _ := manipulate.NewPDFManipulator(pdfBytes, nil, false)
manipulator.DeletePage(2)  // Delete page 2
manipulator.DeletePages([]int{3, 5})  // Delete pages 3 and 5
modifiedPDF, _ := manipulator.Rebuild()

// Extract pages
extractedPDF, _ := manipulate.ExtractPages(pdfBytes, []int{1, 3, 5}, nil, false)

// Merge PDFs
mergedPDF, _ := manipulate.MergePDFs([][]byte{pdf1, pdf2, pdf3}, nil, false)

// Split PDF
ranges := []manipulate.PageRange{
    {Start: 1, End: 5},
    {Start: 6, End: 10},
}
splitPDFs, _ := manipulate.SplitPDF(pdfBytes, ranges, nil, false)

// Split by page count
splitPDFs, _ := manipulate.SplitPDFByPageCount(pdfBytes, 5, nil, false) // 5 pages per PDF

Compare PDFs

import "github.com/benedoc-inc/pdfer/core/compare"

// Compare two PDFs
result, err := compare.ComparePDFs(pdf1Bytes, pdf2Bytes, nil, nil, false)
if err != nil {
    log.Fatal(err)
}

if result.Identical {
    log.Println("PDFs are identical")
} else {
    log.Printf("Found %d differences", result.Summary.TotalDifferences)
    
    // Generate human-readable report
    report := compare.GenerateReport(result)
    log.Println(report)
    
    // Or get JSON report
    jsonReport, _ := compare.GenerateJSONReport(result)
    log.Println(jsonReport)
}

// Advanced comparison options with granularity and sensitivity control
opts := compare.CompareOptions{
    // Metadata options
    IgnoreProducer: true,  // Ignore Producer differences
    IgnoreDates:    true,  // Ignore date differences
    
    // Position tolerance
    TextTolerance:  5.0,   // Position tolerance for text matching (points)
    GraphicTolerance: 5.0,  // Position tolerance for graphics/images
    
    // Text comparison granularity
    TextGranularity: compare.GranularityElement, // element, word, or char
    DiffSensitivity: compare.SensitivityNormal,    // strict, normal, or relaxed
    
    // Move detection
    DetectMoves:    true,  // Detect when text/images move positions
    MoveTolerance: 50.0,  // Position tolerance for detecting moves
    
    // Filtering
    MinChangeThreshold: 0.0, // Minimum change percentage to report (0.0 = all)
    IgnoreWhitespace: false, // Ignore whitespace differences
    IgnoreCase:       false, // Case-insensitive comparison
}
result, _ := compare.ComparePDFsWithOptions(pdf1Bytes, pdf2Bytes, nil, nil, opts)

Comparison Features:

Best-in-class diffing algorithm: Uses LCS (Longest Common Subsequence) for optimal matching
Multi-phase matching: Exact matches → Position-based modifications → Content-based matching
Configurable granularity: Compare at element, word, or character level
Sensitivity control: Strict, normal, or relaxed change detection
Move detection: Identifies when content moves between positions
Image comparison: Binary comparison of image data, position tracking, and move detection
Text extraction: Full text with position, font, and size information
Comprehensive reports: Human-readable and JSON output formats

Error Handling

The library provides structured error handling with categorized error types:

import "github.com/benedoc-inc/pdfer/types"
import "errors"

pdf, err := parse.Open(pdfBytes)
if err != nil {
    // Check for specific error types
    if errors.Is(err, types.ErrWrongPassword) {
        log.Println("Incorrect password")
    } else if errors.Is(err, types.ErrObjectNotFound) {
        log.Println("Object not found")
    }
    
    // Get error code
    if code, ok := types.GetErrorCode(err); ok {
        log.Printf("Error code: %s", code)
    }
    
    // Check error category
    if types.IsEncryptionError(err) {
        log.Println("Encryption-related error")
    } else if types.IsNotFound(err) {
        log.Println("Resource not found")
    }
    
    // Access structured error details
    if pdfErr, ok := types.IsPDFError(err); ok {
        log.Printf("Code: %s, Message: %s", pdfErr.Code, pdfErr.Message)
        if pdfErr.Context != nil {
            log.Printf("Context: %v", pdfErr.Context)
        }
    }
}

Error Categories:

Parsing errors: Invalid PDF, malformed structure, object not found
Encryption errors: Wrong password, decryption failed, unsupported crypto
Form errors: No forms, invalid form, field not found, validation errors
Content errors: Extraction errors, font errors, image errors
Write errors: Write failures, invalid input
I/O errors: File system errors

All errors implement errors.Is() and errors.Unwrap() for compatibility with the standard library.

Metadata Writing

Set document metadata when creating PDFs:

import "github.com/benedoc-inc/pdfer/core/write"
import "github.com/benedoc-inc/pdfer/types"

writer := write.NewPDFWriter()

// Set metadata using DocumentMetadata
metadata := &types.DocumentMetadata{
    Title:        "My Document",
    Author:       "John Doe",
    Subject:      "Example",
    Keywords:     "pdf, example",
    Creator:      "pdfer",
    Producer:     "pdfer 0.9.2",
    CreationDate: "2024-01-15T10:30:00Z",
    ModDate:      "2024-01-16T14:45:00Z",
    Custom: map[string]string{
        "CustomField": "CustomValue",
    },
}
writer.SetMetadata(metadata)

// Or use convenience method with map
writer.SetMetadataFields(map[string]string{
    "title":  "My Document",
    "author": "John Doe",
})

// Dates are automatically formatted to PDF format (D:YYYYMMDDHHmmSSOHH'mm)
// If ModDate is not provided, current time is used

Supported Metadata Fields:

Title, Author, Subject, Keywords
Creator, Producer
CreationDate, ModDate (ISO 8601 or PDF format)
Custom fields (any key-value pairs)

Warning System

The library provides a warning system for collecting non-fatal issues during PDF processing:

import "github.com/benedoc-inc/pdfer/types"
import "github.com/benedoc-inc/pdfer/core/parse"

// Create a warning collector
warnings := types.NewWarningCollector(true)

// Use it in ParseOptions
pdf, err := parse.OpenWithOptions(pdfBytes, parse.ParseOptions{
    Warnings: warnings,
})

// Check for warnings after processing
if warnings.HasWarnings() {
    log.Printf("Found %d warnings", warnings.Count())
    
    // Get all warnings
    for _, warning := range warnings.Warnings() {
        log.Printf("[%s] %s", warning.Level, warning.Message)
    }
    
    // Filter by level
    errors := warnings.FilterByLevel(types.WarningLevelError)
    for _, warning := range errors {
        log.Printf("Error-level warning: %s", warning.Message)
    }
    
    // Filter by code
    fontWarnings := warnings.GetByCode("MISSING_FONT")
    for _, warning := range fontWarnings {
        log.Printf("Font warning: %s", warning.Message)
    }
}

Warning Levels:

WarningLevelInfo - Informational messages
WarningLevelWarning - Non-critical issues
WarningLevelError - Non-fatal errors that should be reported

Warning Features:

Collect warnings during PDF operations
Filter by level or code
Add context to warnings
Enable/disable collection
Access warnings programmatically

Supported PDF Features

Encryption

Feature	Status
RC4 40-bit (V1)	✅
RC4 128-bit (V2)	✅
AES-128 (V4)	✅
AES-256 (V5)	✅
User password	✅
Owner password	✅

PDF Structure

Feature	Status
Cross-reference tables	✅
Cross-reference streams (read)	✅
Cross-reference streams (write)	✅
Object streams (ObjStm)	✅
FlateDecode filter	✅
ASCIIHexDecode filter	✅
ASCII85Decode filter	✅
RunLengthDecode filter	✅
PNG predictor filters	✅
Image embedding (JPEG/PNG)	✅
Page content streams	✅
Incremental updates	✅
Linearized PDFs	❌

Content Extraction

Feature	Status
Text extraction	✅
Graphics extraction	✅
Image extraction	✅
Font extraction	✅
Annotation extraction	✅
Bookmark extraction	✅
Metadata extraction	✅
JSON serialization	✅

Document Manipulation

Feature	Status
Page rotation	✅
Page deletion	✅
Page insertion	✅
Page extraction	✅
PDF merging	✅
PDF splitting	✅
PDF comparison	✅ (Best-in-class LCS diffing algorithm)

XFA Forms

Feature	Status
Template extraction	✅
Datasets extraction	✅
Config extraction	✅
LocaleSet extraction	✅
Form field parsing	✅
Validation rules	✅
Calculation rules	✅
Field value update	✅
PDF rebuild	✅
Dynamic XFA	⚠️ Limited

Implementation Status

See GAPS.md for detailed implementation status and contribution opportunities.

High Priority Gaps

Incremental updates - Parse PDFs with multiple revisions ✅
Font embedding - TrueType/OpenType font subsetting ✅
Image embedding - JPEG, PNG image objects ✅
Page content streams - Text and graphics operators ✅
AES-256 full support - Complete V5/R6 encryption ✅
Structured error handling - Categorized error types with codes and context ✅
Warning system - Non-fatal warning collection and management ✅

Not Planned

Dynamic XFA rendering (requires full layout engine)
Script execution (FormCalc/JavaScript)
Digital signatures (complex PKI requirements)

Testing

go test ./...

Run with verbose output:

go test -v ./...

Contributing

Contributions are welcome! Please see CONTRIBUTING.md for guidelines.

License

MIT License - see LICENSE for details.

Acknowledgments

This library's PDF parsing approach is inspired by pypdf, implementing the "parse-then-decrypt" strategy for handling encrypted PDFs with object streams.

Name		Name	Last commit message	Last commit date
Latest commit History 37 Commits
.githooks		.githooks
cmd/pdfer		cmd/pdfer
content/extract		content/extract
core		core
examples		examples
forms		forms
resources/font		resources/font
scripts		scripts
tests		tests
types		types
.gitignore		.gitignore
CLAUDE.md		CLAUDE.md
CONTRIBUTING.md		CONTRIBUTING.md
GAPS.md		GAPS.md
LICENSE		LICENSE
README.md		README.md
go.mod		go.mod
pdfer.go		pdfer.go

License

benedoc-inc/pdfer

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pdfer

Features

Installation

Quick Start

Open and Parse a PDF (Unified API)

Open an Encrypted PDF

Byte-Perfect PDF Parsing

Extract and Fill Forms (Unified Interface)

Extract XFA from an Encrypted PDF

Parse XFA Form Structure

Update Form Field Values

Create a PDF from Scratch

Embed Images in a PDF

Extract All Content from a PDF

Parse PDFs with Incremental Updates

Byte-Perfect PDF Parsing

Build XFA PDF from XML Streams

Package Structure

Type Aliases

Document Manipulation

Compare PDFs

Error Handling

Metadata Writing

Warning System

Supported PDF Features

Encryption

PDF Structure

Content Extraction

Document Manipulation

XFA Forms

Implementation Status

High Priority Gaps

Not Planned

Testing

Contributing

License

Acknowledgments

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