Create a new print backend for the updated CUPS APIs

printing/backend/cups_ipp_util.cc

Index: printing/backend/cups_ipp_util.cc
diff --git a/printing/backend/cups_ipp_util.cc b/printing/backend/cups_ipp_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..eb9687f9ae91da9e2c80b8eb64fb0176fb824f7e
--- /dev/null
+++ b/printing/backend/cups_ipp_util.cc
@@ -0,0 +1,238 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "printing/backend/cups_ipp_util.h"
+
+#include <cups/cups.h>
+
+#include <algorithm>
+#include <string>
+#include <vector>
+
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_piece.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+#include "printing/backend/cups_printer.h"
+#include "printing/backend/print_backend_consts.h"
+#include "printing/units.h"
+
+namespace printing {
+
+namespace {
+
+const char kIppCollate[] = "sheet-collate";  // RFC 3381
+const char kIppCopies[] = CUPS_COPIES;
+const char kIppColor[] = CUPS_PRINT_COLOR_MODE;
+const char kIppMedia[] = CUPS_MEDIA;
+const char kIppDuplex[] = CUPS_SIDES;
+
+const int kMicronsPerMM = 1000;
+const double kMMPerInch = 25.4;
+const double kMicronsPerInch = kMMPerInch * kMicronsPerMM;
+
+enum Unit {
+  INCHES,
+  MILLIMETERS,
+};
+
+bool PrinterSupportsValue(const CupsPrinter& printer,
+                          base::StringPiece name,
+                          base::StringPiece value) {
+  std::vector<base::StringPiece> values =
+      printer.GetSupportedOptionValueStrings(name);
+  auto iter = std::find(values.begin(), values.end(), value);
+  return iter != values.end();
+}
+
+DuplexMode PrinterDefaultDuplex(const CupsPrinter& printer) {
+  ipp_attribute_t* attr = printer.GetDefaultOptionValue(kIppDuplex);
+  if (attr == nullptr) {
+    return UNKNOWN_DUPLEX_MODE;
+  }
+
+  const char* value = ippGetString(attr, 0, NULL);
+  if (base::EqualsCaseInsensitiveASCII(value, CUPS_SIDES_ONE_SIDED))
+    return SIMPLEX;
+  if (base::EqualsCaseInsensitiveASCII(value, CUPS_SIDES_TWO_SIDED_PORTRAIT))
+    return LONG_EDGE;
+  if (base::EqualsCaseInsensitiveASCII(value, CUPS_SIDES_TWO_SIDED_LANDSCAPE))
+    return SHORT_EDGE;
+
+  return UNKNOWN_DUPLEX_MODE;
+}
+
+gfx::Size DimensionsToMicrons(base::StringPiece value) {
+  Unit unit;
+  base::StringPiece dims;
+  size_t unit_position;
+  if ((unit_position = value.find("mm")) != base::StringPiece::npos) {
+    unit = MILLIMETERS;
+    dims = value.substr(0, unit_position);
+  } else if ((unit_position = value.find("in")) != base::StringPiece::npos) {
+    unit = INCHES;
+    dims = value.substr(0, unit_position);
+  } else {
+    LOG(WARNING) << "Could not parse paper dimensions";
+    return {0, 0};
+  }
+
+  std::vector<std::string> pieces = base::SplitString(
+      dims, "x", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
+  double width;
+  double height;
+
+  if (pieces.size() != 2 || !base::StringToDouble(pieces[0], &width) ||
+      !base::StringToDouble(pieces[1], &height)) {
+    return {0, 0};
+  }
+
+  int width_microns;
+  int height_microns;
+
+  switch (unit) {
+    case MILLIMETERS:
+      width_microns = width * kMicronsPerMM;
+      height_microns = height * kMicronsPerMM;
+      break;
+    case INCHES:
+      width_microns = width * kMicronsPerInch;
+      height_microns = height * kMicronsPerInch;
+      break;
+    default:
+      NOTREACHED();
+      break;
+  }
+
+  return gfx::Size{width_microns, height_microns};
+}
+
+PrinterSemanticCapsAndDefaults::Paper ParsePaper(base::StringPiece value) {
+  // <name>_<width>x<height>{in,mm}
+  // e.g. na_letter_8.5x11in, iso_a4_210x297mm
+
+  std::vector<base::StringPiece> pieces = base::SplitStringPiece(
+      value, "_", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
+  if (pieces.size() < 2) {
+    // we expect at least a display string and a dimension string
+    return PrinterSemanticCapsAndDefaults::Paper();
+  }
+
+  base::StringPiece dimensions = pieces.back();
+
+  std::string display = pieces[0].as_string();
+  for (size_t i = 1; i <= pieces.size() - 2; ++i) {
+    display.append(" ");
+    pieces[i].AppendToString(&display);
+  }
+
+  PrinterSemanticCapsAndDefaults::Paper paper;
+  paper.display_name = display;
+  paper.vendor_id = value.as_string();
+  paper.size_um = DimensionsToMicrons(dimensions);
+
+  return paper;
+}
+
+}  // namespace
+
+void ExtractColor(const CupsPrinter& printer,
+                  PrinterSemanticCapsAndDefaults* printer_info) {
+  std::vector<base::StringPiece> color_modes =
+      printer.GetSupportedOptionValueStrings(kIppColor);
+  auto iter = std::find(color_modes.begin(), color_modes.end(),
+                        CUPS_PRINT_COLOR_MODE_COLOR);
+  if (iter != color_modes.end()) {
+    printer_info->color_model = COLORMODE_COLOR;
+  } else {
+    printer_info->color_model = UNKNOWN_COLOR_MODEL;
+  }
+
+  iter = std::find(color_modes.begin(), color_modes.end(),
+                   CUPS_PRINT_COLOR_MODE_MONOCHROME);
+  if (iter != color_modes.end()) {
+    printer_info->bw_model = COLORMODE_MONOCHROME;
+  } else {
+    printer_info->bw_model = UNKNOWN_COLOR_MODEL;
+  }
+
+  printer_info->color_changeable =
+      (printer_info->color_model != UNKNOWN_COLOR_MODEL &&
+       printer_info->bw_model != UNKNOWN_COLOR_MODEL);
+
+  // default color
+  ipp_attribute_t* attr = printer.GetDefaultOptionValue(kIppColor);
+  if (attr != nullptr) {
+    const char* value = ippGetString(attr, 0, NULL);
+    printer_info->color_default = !base::EqualsCaseInsensitiveASCII(
+        value, CUPS_PRINT_COLOR_MODE_MONOCHROME);
+  }
+}
+
+PrinterSemanticCapsAndDefaults::Paper DefaultPaper(const CupsPrinter& printer) {
+  ipp_attribute_t* attr = printer.GetDefaultOptionValue(kIppMedia);
+  if (attr == nullptr) {
+    return PrinterSemanticCapsAndDefaults::Paper();
+  }
+
+  const char* value = ippGetString(attr, 0, NULL);
+  return ParsePaper(value);
+}
+
+void ExtractPaper(const CupsPrinter& printer,
+                  PrinterSemanticCapsAndDefaults* printer_info) {
+  // paper
+  std::vector<base::StringPiece> papers =
+      printer.GetSupportedOptionValueStrings(kIppMedia);
+  for (base::StringPiece paper : papers) {
+    PrinterSemanticCapsAndDefaults::Paper p = ParsePaper(paper);
+    printer_info->papers.push_back(p);
+  }
+
+  // default paper
+  printer_info->default_paper = DefaultPaper(printer);
+}
+
+void ExtractCopies(const CupsPrinter& printer,
+                   PrinterSemanticCapsAndDefaults* printer_info) {
+  // copies
+  ipp_attribute_t* attr = printer.GetSupportedOptionValues(kIppCopies);
+  if (attr != nullptr) {
+    int upper_bound;
+    int lower_bound = ippGetRange(attr, 0, &upper_bound);
+    printer_info->copies_capable = (lower_bound != -1) && (upper_bound >= 2);
+  } else {
+    printer_info->copies_capable = false;
+  }
+}
+
+void ExtractCollate(const CupsPrinter& printer,
+                    PrinterSemanticCapsAndDefaults* printer_info) {
+  ipp_attribute_t* attr;
+
+  // collate
+  std::vector<base::StringPiece> values =
+      printer.GetSupportedOptionValueStrings(kIppCollate);
+  auto iter = std::find(values.begin(), values.end(), "collated");
+  printer_info->collate_capable = iter != values.end();
+
+  // collate default
+  attr = printer.GetDefaultOptionValue(kIppCollate);
+  if (attr != nullptr) {
+    base::StringPiece name = ippGetString(attr, 0, NULL);
+    printer_info->collate_default = name.compare("collated") == 0;
+  } else {
+    printer_info->collate_default = false;
+  }
+}
+
+void ExtractDuplex(const CupsPrinter& printer,
+                   PrinterSemanticCapsAndDefaults* printer_info) {
+  printer_info->duplex_capable =
+      PrinterSupportsValue(printer, kIppDuplex, CUPS_SIDES_TWO_SIDED_PORTRAIT);
+  printer_info->duplex_default = PrinterDefaultDuplex(printer);
+}
+
+}  //  namespace printing