printing/backend/cups_helper.cc - platform/external/chromium_org - Git at Google

 // Copyright (c) 2012 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_helper.h"

 #include <cups/ppd.h>

 #include "base/base_paths.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "printing/backend/print_backend.h"
 #include "printing/backend/print_backend_consts.h"
 #include "printing/units.h"
 #include "url/gurl.h"

 namespace printing {

 // This section contains helper code for PPD parsing for semantic capabilities.
 namespace {

 const char kColorDevice[] = "ColorDevice";
 const char kColorModel[] = "ColorModel";
 const char kColorMode[] = "ColorMode";
 const char kProcessColorModel[] = "ProcessColorModel";
 const char kPrintoutMode[] = "PrintoutMode";
 const char kDraftGray[] = "Draft.Gray";
 const char kHighGray[] = "High.Gray";

 const char kDuplex[] = "Duplex";
 const char kDuplexNone[] = "None";
 const char kPageSize[] = "PageSize";

 const double kMicronsPerPoint = 10.0f * kHundrethsMMPerInch / kPointsPerInch;

 #if !defined(OS_MACOSX)
 void ParseLpOptions(const base::FilePath& filepath,
                     const std::string& printer_name,
                     int* num_options, cups_option_t** options) {
   std::string content;
   if (!base::ReadFileToString(filepath, &content))
     return;

   const char kDest[] = "dest";
   const char kDefault[] = "default";
   const size_t kDestLen = sizeof(kDest) - 1;
   const size_t kDefaultLen = sizeof(kDefault) - 1;
   std::vector<std::string> lines;
   base::SplitString(content, '\n', &lines);

   for (size_t i = 0; i < lines.size(); ++i) {
     std::string line = lines[i];
     if (line.empty())
       continue;

     if (base::strncasecmp (line.c_str(), kDefault, kDefaultLen) == 0 &&
         isspace(line[kDefaultLen])) {
       line = line.substr(kDefaultLen);
     } else if (base::strncasecmp (line.c_str(), kDest, kDestLen) == 0 &&
                isspace(line[kDestLen])) {
       line = line.substr(kDestLen);
     } else {
       continue;
     }

     base::TrimWhitespaceASCII(line, base::TRIM_ALL, &line);
     if (line.empty())
       continue;

     size_t space_found = line.find(' ');
     if (space_found == std::string::npos)
       continue;

     std::string name = line.substr(0, space_found);
     if (name.empty())
       continue;

     if (base::strncasecmp(printer_name.c_str(), name.c_str(),
                           name.length()) != 0) {
       continue;  // This is not the required printer.
     }

     line = line.substr(space_found + 1);
     // Remove extra spaces.
     base::TrimWhitespaceASCII(line, base::TRIM_ALL, &line);
     if (line.empty())
       continue;
     // Parse the selected printer custom options.
     *num_options = cupsParseOptions(line.c_str(), 0, options);
   }
 }

 void MarkLpOptions(const std::string& printer_name, ppd_file_t** ppd) {
   cups_option_t* options = NULL;
   int num_options = 0;
   ppdMarkDefaults(*ppd);

   const char kSystemLpOptionPath[] = "/etc/cups/lpoptions";
   const char kUserLpOptionPath[] = ".cups/lpoptions";

   std::vector<base::FilePath> file_locations;
   file_locations.push_back(base::FilePath(kSystemLpOptionPath));
   base::FilePath homedir;
   PathService::Get(base::DIR_HOME, &homedir);
   file_locations.push_back(base::FilePath(homedir.Append(kUserLpOptionPath)));

   for (std::vector<base::FilePath>::const_iterator it = file_locations.begin();
        it != file_locations.end(); ++it) {
     num_options = 0;
     options = NULL;
     ParseLpOptions(*it, printer_name, &num_options, &options);
     if (num_options > 0 && options) {
       cupsMarkOptions(*ppd, num_options, options);
       cupsFreeOptions(num_options, options);
     }
   }
 }
 #endif  // !defined(OS_MACOSX)

 bool GetBasicColorModelSettings(ppd_file_t* ppd,
                                 ColorModel* color_model_for_black,
                                 ColorModel* color_model_for_color,
                                 bool* color_is_default) {
   ppd_option_t* color_model = ppdFindOption(ppd, kColorModel);
   if (!color_model)
     return false;

   if (ppdFindChoice(color_model, printing::kBlack))
     *color_model_for_black = printing::BLACK;
   else if (ppdFindChoice(color_model, printing::kGray))
     *color_model_for_black = printing::GRAY;
   else if (ppdFindChoice(color_model, printing::kGrayscale))
     *color_model_for_black = printing::GRAYSCALE;

   if (ppdFindChoice(color_model, printing::kColor))
     *color_model_for_color = printing::COLOR;
   else if (ppdFindChoice(color_model, printing::kCMYK))
     *color_model_for_color = printing::CMYK;
   else if (ppdFindChoice(color_model, printing::kRGB))
     *color_model_for_color = printing::RGB;
   else if (ppdFindChoice(color_model, printing::kRGBA))
     *color_model_for_color = printing::RGBA;
   else if (ppdFindChoice(color_model, printing::kRGB16))
     *color_model_for_color = printing::RGB16;
   else if (ppdFindChoice(color_model, printing::kCMY))
     *color_model_for_color = printing::CMY;
   else if (ppdFindChoice(color_model, printing::kKCMY))
     *color_model_for_color = printing::KCMY;
   else if (ppdFindChoice(color_model, printing::kCMY_K))
     *color_model_for_color = printing::CMY_K;

   ppd_choice_t* marked_choice = ppdFindMarkedChoice(ppd, kColorModel);
   if (!marked_choice)
     marked_choice = ppdFindChoice(color_model, color_model->defchoice);

   if (marked_choice) {
     *color_is_default =
         (base::strcasecmp(marked_choice->choice, printing::kBlack) != 0) &&
         (base::strcasecmp(marked_choice->choice, printing::kGray) != 0) &&
         (base::strcasecmp(marked_choice->choice, printing::kGrayscale) != 0);
   }
   return true;
 }

 bool GetPrintOutModeColorSettings(ppd_file_t* ppd,
                                   ColorModel* color_model_for_black,
                                   ColorModel* color_model_for_color,
                                   bool* color_is_default) {
   ppd_option_t* printout_mode = ppdFindOption(ppd, kPrintoutMode);
   if (!printout_mode)
     return false;

   *color_model_for_color = printing::PRINTOUTMODE_NORMAL;
   *color_model_for_black = printing::PRINTOUTMODE_NORMAL;

   // Check to see if NORMAL_GRAY value is supported by PrintoutMode.
   // If NORMAL_GRAY is not supported, NORMAL value is used to
   // represent grayscale. If NORMAL_GRAY is supported, NORMAL is used to
   // represent color.
   if (ppdFindChoice(printout_mode, printing::kNormalGray))
     *color_model_for_black = printing::PRINTOUTMODE_NORMAL_GRAY;

   // Get the default marked choice to identify the default color setting
   // value.
   ppd_choice_t* printout_mode_choice = ppdFindMarkedChoice(ppd, kPrintoutMode);
   if (!printout_mode_choice) {
       printout_mode_choice = ppdFindChoice(printout_mode,
                                            printout_mode->defchoice);
   }
   if (printout_mode_choice) {
     if ((base::strcasecmp(printout_mode_choice->choice,
                           printing::kNormalGray) == 0) ||
         (base::strcasecmp(printout_mode_choice->choice, kHighGray) == 0) ||
         (base::strcasecmp(printout_mode_choice->choice, kDraftGray) == 0)) {
       *color_model_for_black = printing::PRINTOUTMODE_NORMAL_GRAY;
       *color_is_default = false;
     }
   }
   return true;
 }

 bool GetColorModeSettings(ppd_file_t* ppd,
                           ColorModel* color_model_for_black,
                           ColorModel* color_model_for_color,
                           bool* color_is_default) {
   // Samsung printers use "ColorMode" attribute in their ppds.
   ppd_option_t* color_mode_option = ppdFindOption(ppd, kColorMode);
   if (!color_mode_option)
     return false;

   if (ppdFindChoice(color_mode_option, printing::kColor))
     *color_model_for_color = printing::COLORMODE_COLOR;

   if (ppdFindChoice(color_mode_option, printing::kMonochrome))
     *color_model_for_black = printing::COLORMODE_MONOCHROME;

   ppd_choice_t* mode_choice = ppdFindMarkedChoice(ppd, kColorMode);
   if (!mode_choice) {
     mode_choice = ppdFindChoice(color_mode_option,
                                 color_mode_option->defchoice);
   }

   if (mode_choice) {
     *color_is_default =
         (base::strcasecmp(mode_choice->choice, printing::kColor) == 0);
   }
   return true;
 }

 bool GetHPColorSettings(ppd_file_t* ppd,
                         ColorModel* color_model_for_black,
                         ColorModel* color_model_for_color,
                         bool* color_is_default) {
   // HP printers use "Color/Color Model" attribute in their ppds.
   ppd_option_t* color_mode_option = ppdFindOption(ppd, printing::kColor);
   if (!color_mode_option)
     return false;

   if (ppdFindChoice(color_mode_option, printing::kColor))
     *color_model_for_color = printing::HP_COLOR_COLOR;
   if (ppdFindChoice(color_mode_option, printing::kBlack))
     *color_model_for_black = printing::HP_COLOR_BLACK;

   ppd_choice_t* mode_choice = ppdFindMarkedChoice(ppd, kColorMode);
   if (!mode_choice) {
     mode_choice = ppdFindChoice(color_mode_option,
                                 color_mode_option->defchoice);
   }
   if (mode_choice) {
     *color_is_default =
         (base::strcasecmp(mode_choice->choice, printing::kColor) == 0);
   }
   return true;
 }

 bool GetProcessColorModelSettings(ppd_file_t* ppd,
                                   ColorModel* color_model_for_black,
                                   ColorModel* color_model_for_color,
                                   bool* color_is_default) {
   // Canon printers use "ProcessColorModel" attribute in their ppds.
   ppd_option_t* color_mode_option =  ppdFindOption(ppd, kProcessColorModel);
   if (!color_mode_option)
     return false;

   if (ppdFindChoice(color_mode_option, printing::kRGB))
     *color_model_for_color = printing::PROCESSCOLORMODEL_RGB;
   else if (ppdFindChoice(color_mode_option, printing::kCMYK))
     *color_model_for_color = printing::PROCESSCOLORMODEL_CMYK;

   if (ppdFindChoice(color_mode_option, printing::kGreyscale))
     *color_model_for_black = printing::PROCESSCOLORMODEL_GREYSCALE;

   ppd_choice_t* mode_choice = ppdFindMarkedChoice(ppd, kProcessColorModel);
   if (!mode_choice) {
     mode_choice = ppdFindChoice(color_mode_option,
                                 color_mode_option->defchoice);
   }

   if (mode_choice) {
     *color_is_default =
         (base::strcasecmp(mode_choice->choice, printing::kGreyscale) != 0);
   }
   return true;
 }

 bool GetColorModelSettings(ppd_file_t* ppd,
                            ColorModel* cm_black,
                            ColorModel* cm_color,
                            bool* is_color) {
   bool is_color_device = false;
   ppd_attr_t* attr = ppdFindAttr(ppd, kColorDevice, NULL);
   if (attr && attr->value)
     is_color_device = ppd->color_device;

   *is_color = is_color_device;
   return (is_color_device &&
           GetBasicColorModelSettings(ppd, cm_black, cm_color, is_color)) ||
       GetPrintOutModeColorSettings(ppd, cm_black, cm_color, is_color) ||
       GetColorModeSettings(ppd, cm_black, cm_color, is_color) ||
       GetHPColorSettings(ppd, cm_black, cm_color, is_color) ||
       GetProcessColorModelSettings(ppd, cm_black, cm_color, is_color);
 }

 // Default port for IPP print servers.
 const int kDefaultIPPServerPort = 631;

 }  // namespace

 // Helper wrapper around http_t structure, with connection and cleanup
 // functionality.
 HttpConnectionCUPS::HttpConnectionCUPS(const GURL& print_server_url,
                                        http_encryption_t encryption)
     : http_(NULL) {
   // If we have an empty url, use default print server.
   if (print_server_url.is_empty())
     return;

   int port = print_server_url.IntPort();
   if (port == url::PORT_UNSPECIFIED)
     port = kDefaultIPPServerPort;

   http_ = httpConnectEncrypt(print_server_url.host().c_str(), port, encryption);
   if (http_ == NULL) {
     LOG(ERROR) << "CP_CUPS: Failed connecting to print server: "
                << print_server_url;
   }
 }

 HttpConnectionCUPS::~HttpConnectionCUPS() {
   if (http_ != NULL)
     httpClose(http_);
 }

 void HttpConnectionCUPS::SetBlocking(bool blocking) {
   httpBlocking(http_, blocking ?  1 : 0);
 }

 http_t* HttpConnectionCUPS::http() {
   return http_;
 }

 bool ParsePpdCapabilities(
     const std::string& printer_name,
     const std::string& printer_capabilities,
     PrinterSemanticCapsAndDefaults* printer_info) {
   base::FilePath ppd_file_path;
   if (!base::CreateTemporaryFile(&ppd_file_path))
     return false;

   int data_size = printer_capabilities.length();
   if (data_size != base::WriteFile(
                        ppd_file_path,
                        printer_capabilities.data(),
                        data_size)) {
     base::DeleteFile(ppd_file_path, false);
     return false;
   }

   ppd_file_t* ppd = ppdOpenFile(ppd_file_path.value().c_str());
   if (!ppd) {
     int line = 0;
     ppd_status_t ppd_status = ppdLastError(&line);
     LOG(ERROR) << "Failed to open PDD file: error " << ppd_status << " at line "
                << line << ", " << ppdErrorString(ppd_status);
     return false;
   }

   printing::PrinterSemanticCapsAndDefaults caps;
 #if !defined(OS_MACOSX)
   MarkLpOptions(printer_name, &ppd);
 #endif
   caps.collate_capable = true;
   caps.collate_default = true;
   caps.copies_capable = true;

   ppd_choice_t* duplex_choice = ppdFindMarkedChoice(ppd, kDuplex);
   if (!duplex_choice) {
     ppd_option_t* option = ppdFindOption(ppd, kDuplex);
     if (option)
       duplex_choice = ppdFindChoice(option, option->defchoice);
   }

   if (duplex_choice) {
     caps.duplex_capable = true;
     if (base::strcasecmp(duplex_choice->choice, kDuplexNone) != 0)
       caps.duplex_default = printing::LONG_EDGE;
     else
       caps.duplex_default = printing::SIMPLEX;
   }

   bool is_color = false;
   ColorModel cm_color = UNKNOWN_COLOR_MODEL, cm_black = UNKNOWN_COLOR_MODEL;
   if (!GetColorModelSettings(ppd, &cm_black, &cm_color, &is_color)) {
     VLOG(1) << "Unknown printer color model";
   }

   caps.color_changeable = ((cm_color != UNKNOWN_COLOR_MODEL) &&
                            (cm_black != UNKNOWN_COLOR_MODEL) &&
                            (cm_color != cm_black));
   caps.color_default = is_color;
   caps.color_model = cm_color;
   caps.bw_model = cm_black;

   if (ppd->num_sizes > 0 && ppd->sizes) {
     VLOG(1) << "Paper list size - " << ppd->num_sizes;
     ppd_option_t* paper_option = ppdFindOption(ppd, kPageSize);
     for (int i = 0; i < ppd->num_sizes; ++i) {
       gfx::Size paper_size_microns(
           static_cast<int>(ppd->sizes[i].width * kMicronsPerPoint + 0.5),
           static_cast<int>(ppd->sizes[i].length * kMicronsPerPoint + 0.5));
       if (paper_size_microns.width() > 0 && paper_size_microns.height() > 0) {
         PrinterSemanticCapsAndDefaults::Paper paper;
         paper.size_um = paper_size_microns;
         paper.vendor_id = ppd->sizes[i].name;
         if (paper_option) {
           ppd_choice_t* paper_choice =
               ppdFindChoice(paper_option, ppd->sizes[i].name);
           // Human readable paper name should be UTF-8 encoded, but some PPDs
           // do not follow this standard.
           if (paper_choice && base::IsStringUTF8(paper_choice->text)) {
             paper.display_name = paper_choice->text;
           }
         }
         caps.papers.push_back(paper);
         if (i == 0 || ppd->sizes[i].marked) {
           caps.default_paper = paper;
         }
       }
     }
   }

   ppdClose(ppd);
   base::DeleteFile(ppd_file_path, false);

   *printer_info = caps;
   return true;
 }

 }  // namespace printing
	// Copyright (c) 2012 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_helper.h"

	#include <cups/ppd.h>

	#include "base/base_paths.h"
	#include "base/file_util.h"
	#include "base/logging.h"
	#include "base/path_service.h"
	#include "base/strings/string_number_conversions.h"
	#include "base/strings/string_split.h"
	#include "base/strings/string_util.h"
	#include "base/values.h"
	#include "printing/backend/print_backend.h"
	#include "printing/backend/print_backend_consts.h"
	#include "printing/units.h"
	#include "url/gurl.h"

	namespace printing {

	// This section contains helper code for PPD parsing for semantic capabilities.
	namespace {

	const char kColorDevice[] = "ColorDevice";
	const char kColorModel[] = "ColorModel";
	const char kColorMode[] = "ColorMode";
	const char kProcessColorModel[] = "ProcessColorModel";
	const char kPrintoutMode[] = "PrintoutMode";
	const char kDraftGray[] = "Draft.Gray";
	const char kHighGray[] = "High.Gray";

	const char kDuplex[] = "Duplex";
	const char kDuplexNone[] = "None";
	const char kPageSize[] = "PageSize";

	const double kMicronsPerPoint = 10.0f * kHundrethsMMPerInch / kPointsPerInch;

	#if !defined(OS_MACOSX)
	void ParseLpOptions(const base::FilePath& filepath,
	const std::string& printer_name,
	int* num_options, cups_option_t** options) {
	std::string content;
	if (!base::ReadFileToString(filepath, &content))
	return;

	const char kDest[] = "dest";
	const char kDefault[] = "default";
	const size_t kDestLen = sizeof(kDest) - 1;
	const size_t kDefaultLen = sizeof(kDefault) - 1;
	std::vector<std::string> lines;
	base::SplitString(content, '\n', &lines);

	for (size_t i = 0; i < lines.size(); ++i) {
	std::string line = lines[i];
	if (line.empty())
	continue;

	if (base::strncasecmp (line.c_str(), kDefault, kDefaultLen) == 0 &&
	isspace(line[kDefaultLen])) {
	line = line.substr(kDefaultLen);
	} else if (base::strncasecmp (line.c_str(), kDest, kDestLen) == 0 &&
	isspace(line[kDestLen])) {
	line = line.substr(kDestLen);
	} else {
	continue;
	}

	base::TrimWhitespaceASCII(line, base::TRIM_ALL, &line);
	if (line.empty())
	continue;

	size_t space_found = line.find(' ');
	if (space_found == std::string::npos)
	continue;

	std::string name = line.substr(0, space_found);
	if (name.empty())
	continue;

	if (base::strncasecmp(printer_name.c_str(), name.c_str(),
	name.length()) != 0) {
	continue; // This is not the required printer.
	}

	line = line.substr(space_found + 1);
	// Remove extra spaces.
	base::TrimWhitespaceASCII(line, base::TRIM_ALL, &line);
	if (line.empty())
	continue;
	// Parse the selected printer custom options.
	*num_options = cupsParseOptions(line.c_str(), 0, options);
	}
	}

	void MarkLpOptions(const std::string& printer_name, ppd_file_t** ppd) {
	cups_option_t* options = NULL;
	int num_options = 0;
	ppdMarkDefaults(*ppd);

	const char kSystemLpOptionPath[] = "/etc/cups/lpoptions";
	const char kUserLpOptionPath[] = ".cups/lpoptions";

	std::vector<base::FilePath> file_locations;
	file_locations.push_back(base::FilePath(kSystemLpOptionPath));
	base::FilePath homedir;
	PathService::Get(base::DIR_HOME, &homedir);
	file_locations.push_back(base::FilePath(homedir.Append(kUserLpOptionPath)));

	for (std::vector<base::FilePath>::const_iterator it = file_locations.begin();
	it != file_locations.end(); ++it) {
	num_options = 0;
	options = NULL;
	ParseLpOptions(*it, printer_name, &num_options, &options);
	if (num_options > 0 && options) {
	cupsMarkOptions(*ppd, num_options, options);
	cupsFreeOptions(num_options, options);
	}
	}
	}
	#endif // !defined(OS_MACOSX)

	bool GetBasicColorModelSettings(ppd_file_t* ppd,
	ColorModel* color_model_for_black,
	ColorModel* color_model_for_color,
	bool* color_is_default) {
	ppd_option_t* color_model = ppdFindOption(ppd, kColorModel);
	if (!color_model)
	return false;

	if (ppdFindChoice(color_model, printing::kBlack))
	*color_model_for_black = printing::BLACK;
	else if (ppdFindChoice(color_model, printing::kGray))
	*color_model_for_black = printing::GRAY;
	else if (ppdFindChoice(color_model, printing::kGrayscale))
	*color_model_for_black = printing::GRAYSCALE;

	if (ppdFindChoice(color_model, printing::kColor))
	*color_model_for_color = printing::COLOR;
	else if (ppdFindChoice(color_model, printing::kCMYK))
	*color_model_for_color = printing::CMYK;
	else if (ppdFindChoice(color_model, printing::kRGB))
	*color_model_for_color = printing::RGB;
	else if (ppdFindChoice(color_model, printing::kRGBA))
	*color_model_for_color = printing::RGBA;
	else if (ppdFindChoice(color_model, printing::kRGB16))
	*color_model_for_color = printing::RGB16;
	else if (ppdFindChoice(color_model, printing::kCMY))
	*color_model_for_color = printing::CMY;
	else if (ppdFindChoice(color_model, printing::kKCMY))
	*color_model_for_color = printing::KCMY;
	else if (ppdFindChoice(color_model, printing::kCMY_K))
	*color_model_for_color = printing::CMY_K;

	ppd_choice_t* marked_choice = ppdFindMarkedChoice(ppd, kColorModel);
	if (!marked_choice)
	marked_choice = ppdFindChoice(color_model, color_model->defchoice);

	if (marked_choice) {
	*color_is_default =
	(base::strcasecmp(marked_choice->choice, printing::kBlack) != 0) &&
	(base::strcasecmp(marked_choice->choice, printing::kGray) != 0) &&
	(base::strcasecmp(marked_choice->choice, printing::kGrayscale) != 0);
	}
	return true;
	}

	bool GetPrintOutModeColorSettings(ppd_file_t* ppd,
	ColorModel* color_model_for_black,
	ColorModel* color_model_for_color,
	bool* color_is_default) {
	ppd_option_t* printout_mode = ppdFindOption(ppd, kPrintoutMode);
	if (!printout_mode)
	return false;

	*color_model_for_color = printing::PRINTOUTMODE_NORMAL;
	*color_model_for_black = printing::PRINTOUTMODE_NORMAL;

	// Check to see if NORMAL_GRAY value is supported by PrintoutMode.
	// If NORMAL_GRAY is not supported, NORMAL value is used to
	// represent grayscale. If NORMAL_GRAY is supported, NORMAL is used to
	// represent color.
	if (ppdFindChoice(printout_mode, printing::kNormalGray))
	*color_model_for_black = printing::PRINTOUTMODE_NORMAL_GRAY;

	// Get the default marked choice to identify the default color setting
	// value.
	ppd_choice_t* printout_mode_choice = ppdFindMarkedChoice(ppd, kPrintoutMode);
	if (!printout_mode_choice) {
	printout_mode_choice = ppdFindChoice(printout_mode,
	printout_mode->defchoice);
	}
	if (printout_mode_choice) {
	if ((base::strcasecmp(printout_mode_choice->choice,
	printing::kNormalGray) == 0) \|\|
	(base::strcasecmp(printout_mode_choice->choice, kHighGray) == 0) \|\|
	(base::strcasecmp(printout_mode_choice->choice, kDraftGray) == 0)) {
	*color_model_for_black = printing::PRINTOUTMODE_NORMAL_GRAY;
	*color_is_default = false;
	}
	}
	return true;
	}

	bool GetColorModeSettings(ppd_file_t* ppd,
	ColorModel* color_model_for_black,
	ColorModel* color_model_for_color,
	bool* color_is_default) {
	// Samsung printers use "ColorMode" attribute in their ppds.
	ppd_option_t* color_mode_option = ppdFindOption(ppd, kColorMode);
	if (!color_mode_option)
	return false;

	if (ppdFindChoice(color_mode_option, printing::kColor))
	*color_model_for_color = printing::COLORMODE_COLOR;

	if (ppdFindChoice(color_mode_option, printing::kMonochrome))
	*color_model_for_black = printing::COLORMODE_MONOCHROME;

	ppd_choice_t* mode_choice = ppdFindMarkedChoice(ppd, kColorMode);
	if (!mode_choice) {
	mode_choice = ppdFindChoice(color_mode_option,
	color_mode_option->defchoice);
	}

	if (mode_choice) {
	*color_is_default =
	(base::strcasecmp(mode_choice->choice, printing::kColor) == 0);
	}
	return true;
	}

	bool GetHPColorSettings(ppd_file_t* ppd,
	ColorModel* color_model_for_black,
	ColorModel* color_model_for_color,
	bool* color_is_default) {
	// HP printers use "Color/Color Model" attribute in their ppds.
	ppd_option_t* color_mode_option = ppdFindOption(ppd, printing::kColor);
	if (!color_mode_option)
	return false;

	if (ppdFindChoice(color_mode_option, printing::kColor))
	*color_model_for_color = printing::HP_COLOR_COLOR;
	if (ppdFindChoice(color_mode_option, printing::kBlack))
	*color_model_for_black = printing::HP_COLOR_BLACK;

	ppd_choice_t* mode_choice = ppdFindMarkedChoice(ppd, kColorMode);
	if (!mode_choice) {
	mode_choice = ppdFindChoice(color_mode_option,
	color_mode_option->defchoice);
	}
	if (mode_choice) {
	*color_is_default =
	(base::strcasecmp(mode_choice->choice, printing::kColor) == 0);
	}
	return true;
	}

	bool GetProcessColorModelSettings(ppd_file_t* ppd,
	ColorModel* color_model_for_black,
	ColorModel* color_model_for_color,
	bool* color_is_default) {
	// Canon printers use "ProcessColorModel" attribute in their ppds.
	ppd_option_t* color_mode_option = ppdFindOption(ppd, kProcessColorModel);
	if (!color_mode_option)
	return false;

	if (ppdFindChoice(color_mode_option, printing::kRGB))
	*color_model_for_color = printing::PROCESSCOLORMODEL_RGB;
	else if (ppdFindChoice(color_mode_option, printing::kCMYK))
	*color_model_for_color = printing::PROCESSCOLORMODEL_CMYK;

	if (ppdFindChoice(color_mode_option, printing::kGreyscale))
	*color_model_for_black = printing::PROCESSCOLORMODEL_GREYSCALE;

	ppd_choice_t* mode_choice = ppdFindMarkedChoice(ppd, kProcessColorModel);
	if (!mode_choice) {
	mode_choice = ppdFindChoice(color_mode_option,
	color_mode_option->defchoice);
	}

	if (mode_choice) {
	*color_is_default =
	(base::strcasecmp(mode_choice->choice, printing::kGreyscale) != 0);
	}
	return true;
	}

	bool GetColorModelSettings(ppd_file_t* ppd,
	ColorModel* cm_black,
	ColorModel* cm_color,
	bool* is_color) {
	bool is_color_device = false;
	ppd_attr_t* attr = ppdFindAttr(ppd, kColorDevice, NULL);
	if (attr && attr->value)
	is_color_device = ppd->color_device;

	*is_color = is_color_device;
	return (is_color_device &&
	GetBasicColorModelSettings(ppd, cm_black, cm_color, is_color)) \|\|
	GetPrintOutModeColorSettings(ppd, cm_black, cm_color, is_color) \|\|
	GetColorModeSettings(ppd, cm_black, cm_color, is_color) \|\|
	GetHPColorSettings(ppd, cm_black, cm_color, is_color) \|\|
	GetProcessColorModelSettings(ppd, cm_black, cm_color, is_color);
	}

	// Default port for IPP print servers.
	const int kDefaultIPPServerPort = 631;

	} // namespace

	// Helper wrapper around http_t structure, with connection and cleanup
	// functionality.
	HttpConnectionCUPS::HttpConnectionCUPS(const GURL& print_server_url,
	http_encryption_t encryption)
	: http_(NULL) {
	// If we have an empty url, use default print server.
	if (print_server_url.is_empty())
	return;

	int port = print_server_url.IntPort();
	if (port == url::PORT_UNSPECIFIED)
	port = kDefaultIPPServerPort;

	http_ = httpConnectEncrypt(print_server_url.host().c_str(), port, encryption);
	if (http_ == NULL) {
	LOG(ERROR) << "CP_CUPS: Failed connecting to print server: "
	<< print_server_url;
	}
	}

	HttpConnectionCUPS::~HttpConnectionCUPS() {
	if (http_ != NULL)
	httpClose(http_);
	}

	void HttpConnectionCUPS::SetBlocking(bool blocking) {
	httpBlocking(http_, blocking ? 1 : 0);
	}

	http_t* HttpConnectionCUPS::http() {
	return http_;
	}

	bool ParsePpdCapabilities(
	const std::string& printer_name,
	const std::string& printer_capabilities,
	PrinterSemanticCapsAndDefaults* printer_info) {
	base::FilePath ppd_file_path;
	if (!base::CreateTemporaryFile(&ppd_file_path))
	return false;

	int data_size = printer_capabilities.length();
	if (data_size != base::WriteFile(
	ppd_file_path,
	printer_capabilities.data(),
	data_size)) {
	base::DeleteFile(ppd_file_path, false);
	return false;
	}

	ppd_file_t* ppd = ppdOpenFile(ppd_file_path.value().c_str());
	if (!ppd) {
	int line = 0;
	ppd_status_t ppd_status = ppdLastError(&line);
	LOG(ERROR) << "Failed to open PDD file: error " << ppd_status << " at line "
	<< line << ", " << ppdErrorString(ppd_status);
	return false;
	}

	printing::PrinterSemanticCapsAndDefaults caps;
	#if !defined(OS_MACOSX)
	MarkLpOptions(printer_name, &ppd);
	#endif
	caps.collate_capable = true;
	caps.collate_default = true;
	caps.copies_capable = true;

	ppd_choice_t* duplex_choice = ppdFindMarkedChoice(ppd, kDuplex);
	if (!duplex_choice) {
	ppd_option_t* option = ppdFindOption(ppd, kDuplex);
	if (option)
	duplex_choice = ppdFindChoice(option, option->defchoice);
	}

	if (duplex_choice) {
	caps.duplex_capable = true;
	if (base::strcasecmp(duplex_choice->choice, kDuplexNone) != 0)
	caps.duplex_default = printing::LONG_EDGE;
	else
	caps.duplex_default = printing::SIMPLEX;
	}

	bool is_color = false;
	ColorModel cm_color = UNKNOWN_COLOR_MODEL, cm_black = UNKNOWN_COLOR_MODEL;
	if (!GetColorModelSettings(ppd, &cm_black, &cm_color, &is_color)) {
	VLOG(1) << "Unknown printer color model";
	}

	caps.color_changeable = ((cm_color != UNKNOWN_COLOR_MODEL) &&
	(cm_black != UNKNOWN_COLOR_MODEL) &&
	(cm_color != cm_black));
	caps.color_default = is_color;
	caps.color_model = cm_color;
	caps.bw_model = cm_black;

	if (ppd->num_sizes > 0 && ppd->sizes) {
	VLOG(1) << "Paper list size - " << ppd->num_sizes;
	ppd_option_t* paper_option = ppdFindOption(ppd, kPageSize);
	for (int i = 0; i < ppd->num_sizes; ++i) {
	gfx::Size paper_size_microns(
	static_cast<int>(ppd->sizes[i].width * kMicronsPerPoint + 0.5),
	static_cast<int>(ppd->sizes[i].length * kMicronsPerPoint + 0.5));
	if (paper_size_microns.width() > 0 && paper_size_microns.height() > 0) {
	PrinterSemanticCapsAndDefaults::Paper paper;
	paper.size_um = paper_size_microns;
	paper.vendor_id = ppd->sizes[i].name;
	if (paper_option) {
	ppd_choice_t* paper_choice =
	ppdFindChoice(paper_option, ppd->sizes[i].name);
	// Human readable paper name should be UTF-8 encoded, but some PPDs
	// do not follow this standard.
	if (paper_choice && base::IsStringUTF8(paper_choice->text)) {
	paper.display_name = paper_choice->text;
	}
	}
	caps.papers.push_back(paper);
	if (i == 0 \|\| ppd->sizes[i].marked) {
	caps.default_paper = paper;
	}
	}
	}
	}

	ppdClose(ppd);
	base::DeleteFile(ppd_file_path, false);

	*printer_info = caps;
	return true;
	}

	} // namespace printing