pdf-ocr-cli/dist/mergePdfs.js

A CLI tool for OCR processing of PDF files using Mistral API with optional LLM verification

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.mergePdfs = mergePdfs;
const pdf_lib_1 = require("pdf-lib");
/**
 * Merges multiple PDF buffers into a single PDF document
 * @param pdfBuffers - Array of PDF buffers to merge
 * @returns Buffer containing the merged PDF document
 * @throws Error if any of the PDFs are invalid
 */
async function mergePdfs(pdfBuffers) {
    try {
        // Create a new PDF document
        const mergedPdf = await pdf_lib_1.PDFDocument.create();
        // If no PDFs to merge, return an empty PDF with one blank page
        if (pdfBuffers.length === 0) {
            // Add a blank page to match pdf-lib's default behavior
            mergedPdf.addPage();
            const pdfBytes = await mergedPdf.save();
            return Buffer.from(pdfBytes);
        }
        // Process each PDF buffer
        for (const pdfBuffer of pdfBuffers) {
            // Load the PDF document
            const pdf = await pdf_lib_1.PDFDocument.load(pdfBuffer);
            // Get the number of pages
            const pageCount = pdf.getPageCount();
            // Copy all pages to the merged PDF
            if (pageCount > 0) {
                const copiedPages = await mergedPdf.copyPages(pdf, pdf.getPageIndices());
                copiedPages.forEach(page => mergedPdf.addPage(page));
            }
        }
        // Save the merged PDF to a buffer
        const pdfBytes = await mergedPdf.save();
        return Buffer.from(pdfBytes);
    }
    catch (error) {
        // Handle errors
        if (error instanceof Error) {
            throw new Error(`Invalid PDF: ${error.message}`);
        }
        else {
            throw new Error('Invalid PDF: Unknown error');
        }
    }
}