feature: Barcode/QR Cover Sheet System
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voltsrage
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using System.Globalization;
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using System.IO.Compression;
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using System.Text;
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using QRCoder;
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/// <summary>
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/// Builds printable cover sheet PDFs using raw PDF 1.4 objects and QRCoder for QR images.
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/// Each page includes a header, QR code, human-readable metadata, and a footer instruction line.
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/// </summary>
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public static class CoverSheetPdfGenerator
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{
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private const float PageWidth = 612f;
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private const float PageHeight = 792f;
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private const float QrDisplaySize = 200f;
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private const float LeftMargin = 72f;
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public static byte[] Generate(CoverSheet sheet) =>
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GenerateBatch(new[] { sheet });
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public static byte[] GenerateBatch(IReadOnlyList<CoverSheet> sheets)
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{
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if (sheets.Count == 0)
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throw new ArgumentException("At least one cover sheet is required.", nameof(sheets));
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var pages = sheets.Select(BuildPage).ToList();
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return BuildPdf(pages);
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}
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private sealed record PageData(string ContentStream, byte[] ImageRgb, int ImageWidth, int ImageHeight);
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private static PageData BuildPage(CoverSheet sheet)
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{
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var (rgb, width, height) = GenerateQrRgb(sheet.Code);
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var content = BuildContentStream(sheet);
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return new PageData(content, rgb, width, height);
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}
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private static (byte[] Rgb, int Width, int Height) GenerateQrRgb(string code)
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{
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using var generator = new QRCodeGenerator();
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using var data = generator.CreateQrCode(code, QRCodeGenerator.ECCLevel.M);
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var modules = data.ModuleMatrix.Count;
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const int scale = 8;
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const int quiet = 2;
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var size = (modules + quiet * 2) * scale;
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var rgb = new byte[size * size * 3];
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for (var y = 0; y < size; y++)
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{
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for (var x = 0; x < size; x++)
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{
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var mx = x / scale - quiet;
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var my = y / scale - quiet;
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var dark = mx >= 0 && my >= 0 && mx < modules && my < modules && data.ModuleMatrix[my][mx];
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var color = dark ? (byte)0 : (byte)255;
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var i = (y * size + x) * 3;
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rgb[i] = color;
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rgb[i + 1] = color;
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rgb[i + 2] = color;
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}
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}
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return (rgb, size, size);
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}
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private static string BuildContentStream(CoverSheet sheet)
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{
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var sb = new StringBuilder();
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var qrX = (PageWidth - QrDisplaySize) / 2f;
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const float qrY = 470f;
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sb.AppendLine(CultureInfo.InvariantCulture, $"q {QrDisplaySize} 0 0 {QrDisplaySize} {qrX} {qrY} cm /Im1 Do Q");
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WriteTextLine(sb, 18f, LeftMargin, 740f, "VigilCare Records - Cover Sheet");
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var y = 430f;
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y = WriteTextLine(sb, 12f, LeftMargin, y, $"Code: {sheet.Code}");
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y = WriteTextLine(sb, 12f, LeftMargin, y, $"Batch Type: {sheet.BatchType.ToDbString()}");
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y = WriteTextLine(sb, 12f, LeftMargin, y, $"Track: {sheet.Track.ToDbString()}");
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if (sheet.Patient is not null)
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{
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y = WriteTextLine(sb, 12f, LeftMargin, y,
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$"Patient: {sheet.Patient.FullName} (MRN {sheet.Patient.Mrn})");
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}
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if (sheet.AssignToUser is not null)
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{
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y = WriteTextLine(sb, 12f, LeftMargin, y,
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$"Assigned To: {sheet.AssignToUser.FullName}");
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}
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var generated = sheet.CreatedAt.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture);
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WriteTextLine(sb, 12f, LeftMargin, y, $"Generated: {generated}");
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WriteTextLine(sb, 10f, LeftMargin, 48f,
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"Attach to front of chart section. Scanner reads QR code automatically.");
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return sb.ToString();
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}
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private static float WriteTextLine(StringBuilder sb, float fontSize, float x, float y, string text)
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{
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sb.AppendLine("BT");
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sb.AppendLine(CultureInfo.InvariantCulture, $"/F1 {fontSize} Tf");
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sb.AppendLine(CultureInfo.InvariantCulture, $"{x} {y} Td");
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sb.AppendLine(CultureInfo.InvariantCulture, $"({EscapePdfString(text)}) Tj");
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sb.AppendLine("ET");
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return y - fontSize - 8f;
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}
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private static byte[] BuildPdf(IReadOnlyList<PageData> pages)
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{
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using var ms = new MemoryStream();
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ms.Write("%PDF-1.4\n"u8);
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var offsets = new List<long>();
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const int catalogId = 1;
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const int pagesId = 2;
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const int fontId = 3;
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var pageIds = Enumerable.Range(0, pages.Count).Select(i => 4 + i * 3).ToArray();
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var contentIds = pageIds.Select(id => id + 1).ToArray();
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var imageIds = pageIds.Select(id => id + 2).ToArray();
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offsets.Add(ms.Position);
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WriteAscii(ms, $"{catalogId} 0 obj\n<< /Type /Catalog /Pages {pagesId} 0 R >>\nendobj\n");
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offsets.Add(ms.Position);
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var kids = string.Join(" ", pageIds.Select(id => $"{id} 0 R"));
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WriteAscii(ms, $"{pagesId} 0 obj\n<< /Type /Pages /Kids [{kids}] /Count {pages.Count} >>\nendobj\n");
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offsets.Add(ms.Position);
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WriteAscii(ms, $"{fontId} 0 obj\n<< /Type /Font /Subtype /Type1 /BaseFont /Helvetica >>\nendobj\n");
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for (var i = 0; i < pages.Count; i++)
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{
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var page = pages[i];
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var pageId = pageIds[i];
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var contentId = contentIds[i];
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var imageId = imageIds[i];
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var contentBytes = Encoding.ASCII.GetBytes(page.ContentStream);
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var imageBytes = FlateEncode(page.ImageRgb);
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offsets.Add(ms.Position);
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WriteAscii(ms,
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$"{pageId} 0 obj\n" +
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$"<< /Type /Page /Parent {pagesId} 0 R " +
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$"/MediaBox [0 0 {PageWidth} {PageHeight}] " +
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$"/Contents {contentId} 0 R " +
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$"/Resources << /Font << /F1 {fontId} 0 R >> /XObject << /Im1 {imageId} 0 R >> >> >>\n" +
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"endobj\n");
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offsets.Add(ms.Position);
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WriteAscii(ms,
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$"{contentId} 0 obj\n<< /Length {contentBytes.Length} >>\nstream\n");
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ms.Write(contentBytes);
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WriteAscii(ms, "\nendstream\nendobj\n");
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offsets.Add(ms.Position);
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WriteAscii(ms,
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$"{imageId} 0 obj\n" +
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$"<< /Type /XObject /Subtype /Image " +
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$"/Width {page.ImageWidth} /Height {page.ImageHeight} " +
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"/ColorSpace /DeviceRGB /BitsPerComponent 8 " +
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$"/Filter /FlateDecode /Length {imageBytes.Length} >>\nstream\n");
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ms.Write(imageBytes);
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WriteAscii(ms, "\nendstream\nendobj\n");
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}
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var xrefOffset = ms.Position;
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WriteAscii(ms, "xref\n");
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WriteAscii(ms, $"0 {offsets.Count + 1}\n");
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WriteAscii(ms, "0000000000 65535 f \n");
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foreach (var offset in offsets)
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WriteAscii(ms, $"{offset:D10} 00000 n \n");
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WriteAscii(ms,
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"trailer\n" +
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$"<< /Size {offsets.Count + 1} /Root {catalogId} 0 R >>\n" +
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"startxref\n" +
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$"{xrefOffset}\n" +
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"%%EOF\n");
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return ms.ToArray();
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}
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private static void WriteAscii(Stream stream, string text) =>
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stream.Write(Encoding.ASCII.GetBytes(text));
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private static byte[] FlateEncode(byte[] data)
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{
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using var output = new MemoryStream();
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using (var deflate = new ZLibStream(output, CompressionLevel.Optimal, leaveOpen: true))
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deflate.Write(data, 0, data.Length);
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return output.ToArray();
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}
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private static string EscapePdfString(string value) =>
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value.Replace("\\", "\\\\", StringComparison.Ordinal)
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.Replace("(", "\\(", StringComparison.Ordinal)
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.Replace(")", "\\)", StringComparison.Ordinal);
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}
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