#pdfwrite

#Overview

• Serialize Pdf documents to byte streams
• Write to files, channels, or in-memory buffers
• Optionally encrypt output with passwords
• Generate object streams for compression
• Convert PDF objects to string representation

#Types

#PdfWrite

pub struct PdfWrite { ... }
pub fn PdfWrite::new(logger? : (String) -> Unit = @pdfe.logger.val) -> PdfWrite

#Writing PDFs

#To File (Simple)

@pdfwritefs.PdfWriteFs::new().pdf_to_file(pdf, "/path/to/output.pdf")

#To File (With Options)

@pdfwritefs.PdfWriteFs::new().pdf_to_file_options(
  preserve_objstm=false,    // Keep existing object streams
  generate_objstm=true,     // Create new object streams
  compress_objstm=true,     // Compress object streams
  encryption=None,          // Optional encryption
  build_new_id=true,        // Generate new /ID entry
  pdf~,
  filename="/path/to/output.pdf",
)

#To Channel (async)

@pdfwritefs.PdfWriteFs::new().pdf_to_channel(
  encryption=None,
  build_new_id=true,
  pdf~,
  channel,
)

#To Output Stream

let (output, data) = @pdfio.Output::of_bytes(65536)
@pdfwrite.PdfWrite::new().pdf_to_output(
  encryption=None,
  build_new_id=true,
  pdf~,
  output~,
)
let bytes = output.extract_bytes(data)

#Encryption

#Creating Encryption Settings

///|
let encryption = @pdfwrite.Encryption::new(
  @pdfcrypt.EncryptionMethod::AES256,
  user_password="user",
  owner_password="owner",
  permissions=[@pdfcrypt.Permission::Print, @pdfcrypt.Permission::Copy],
)

#Writing Encrypted PDF

@pdfwritefs.PdfWriteFs::new().pdf_to_file_options(
  encryption=Some(encryption),
  build_new_id=true,
  pdf~,
  filename="/path/to/encrypted.pdf",
)

#Re-encryption

@pdfwritefs.PdfWriteFs::new().pdf_to_file_options(
  recrypt="user-password",           // Password for the existing encryption
  encryption=None,                   // Uses saved encryption metadata
  build_new_id=false,
  pdf~,
  filename="/path/to/output.pdf",
)

#Object Streams

// Generate compressed object streams
@pdfwritefs.PdfWriteFs::new().pdf_to_file_options(
  generate_objstm=true,   // Create object streams
  compress_objstm=true,   // Compress with deflate
  encryption=None,
  build_new_id=true,
  pdf~,
  filename="/path/to/compressed.pdf",
)

// Preserve existing object streams
@pdfwritefs.PdfWriteFs::new().pdf_to_file_options(
  preserve_objstm=true,
  encryption=None,
  build_new_id=true,
  pdf~,
  filename="/path/to/output.pdf",
)

#Object Serialization

#Convert Object to String

///|
test "string_of_pdf serializes objects" {
  let obj : @pdf.PdfObject = Dictionary([
    ("/Type", Name(@pdf.PdfName::of_string("/Page"))),
  ])
  let s = @pdfwrite.PdfWrite::new().string_of_pdf(obj)
  assert_true(s.contains("/Type"))
  assert_true(s.contains("/Page"))
}

#Logging

// Redirect warnings/debug output during writing.
let write_ctx = @pdfwrite.PdfWrite::new(logger=_ => ())
ignore(write_ctx)

#Encryption Methods

///|
pub type EncryptionMethod = @pdfcrypt.EncryptionMethod

// Available methods:
// AES256       - AES 256-bit (PDF 2.0, recommended)
// AES128       - AES 128-bit (PDF 1.6+)
// ARC4(Int)    - RC4 with key length (legacy)

#Encryption Struct

///|
pub struct Encryption {
  encryption_method : EncryptionMethod
  user_password : String
  owner_password : String
  permissions : Array[@pdfcrypt.Permission]
}