net/base/escape.h - cobalt - 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.

 #ifndef NET_BASE_ESCAPE_H_
 #define NET_BASE_ESCAPE_H_

 #include <set>
 #include <string>

 #include "base/strings/string16.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/utf_offset_string_conversions.h"
 #include "net/base/net_export.h"
 #include "starboard/types.h"

 namespace net {

 // Escaping --------------------------------------------------------------------

 // Escapes all characters except unreserved characters. Unreserved characters,
 // as defined in RFC 3986, include alphanumerics and -._~
 NET_EXPORT std::string EscapeAllExceptUnreserved(base::StringPiece text);

 // Escapes characters in text suitable for use as a query parameter value.
 // We %XX everything except alphanumerics and -_.!~*'()
 // Spaces change to "+" unless you pass usePlus=false.
 // This is basically the same as encodeURIComponent in javascript.
 NET_EXPORT std::string EscapeQueryParamValue(base::StringPiece text,
                                              bool use_plus);

 // Escapes a partial or complete file/pathname.  This includes:
 // non-printable, non-7bit, and (including space)  "#%:<>?[\]^`{|}
 NET_EXPORT std::string EscapePath(base::StringPiece path);

 #if defined(OS_MACOSX)
 // Escapes characters as per expectations of NSURL. This includes:
 // non-printable, non-7bit, and (including space)  "#%<>[\]^`{|}
 NET_EXPORT std::string EscapeNSURLPrecursor(base::StringPiece precursor);
 #endif  // defined(OS_MACOSX)

 // Escapes application/x-www-form-urlencoded content.  This includes:
 // non-printable, non-7bit, and (including space)  ?>=<;+'&%$#"![\]^`{|}
 // Space is escaped as + (if use_plus is true) and other special characters
 // as %XX (hex).
 NET_EXPORT std::string EscapeUrlEncodedData(base::StringPiece path,
                                             bool use_plus);

 // QUIC46
 // Escapes all non-ASCII input, as well as escaping % to %25.
 NET_EXPORT std::string EscapeNonASCIIAndPercent(base::StringPiece input);

 // Escapes all non-ASCII input.
 NET_EXPORT std::string EscapeNonASCII(base::StringPiece input);

 // Escapes characters in text suitable for use as an external protocol handler
 // command.
 // We %XX everything except alphanumerics and -_.!~*'() and the restricted
 // characters (;/?:@&=+$,#[]) and a valid percent escape sequence (%XX).
 NET_EXPORT std::string EscapeExternalHandlerValue(base::StringPiece text);

 // Appends the given character to the output string, escaping the character if
 // the character would be interpreted as an HTML delimiter.
 NET_EXPORT void AppendEscapedCharForHTML(char c, std::string* output);

 // Escapes chars that might cause this text to be interpreted as HTML tags.
 NET_EXPORT std::string EscapeForHTML(base::StringPiece text);
 NET_EXPORT base::string16 EscapeForHTML(base::StringPiece16 text);

 // Unescaping ------------------------------------------------------------------

 class UnescapeRule {
  public:
   // A combination of the following flags that is passed to the unescaping
   // functions.
   typedef uint32_t Type;

   enum {
     // Don't unescape anything at all.
     NONE = 0,

     // Don't unescape anything special, but all normal unescaping will happen.
     // This is a placeholder and can't be combined with other flags (since it's
     // just the absence of them). All other unescape rules imply "normal" in
     // addition to their special meaning. Things like escaped letters, digits,
     // and most symbols will get unescaped with this mode.
     NORMAL = 1 << 0,

     // Convert %20 to spaces. In some places where we're showing URLs, we may
     // want this. In places where the URL may be copied and pasted out, then
     // you wouldn't want this since it might not be interpreted in one piece
     // by other applications.  Other UTF-8 spaces will not be unescaped.
     SPACES = 1 << 1,

     // Unescapes '/' and '\\'. If these characters were unescaped, the resulting
     // URL won't be the same as the source one. Moreover, they are dangerous to
     // unescape in strings that will be used as file paths or names. This value
     // should only be used when slashes don't have special meaning, like data
     // URLs.
     PATH_SEPARATORS = 1 << 2,

     // Unescapes various characters that will change the meaning of URLs,
     // including '%', '+', '&', '#'. Does not unescape path separators.
     // If these characters were unescaped, the resulting URL won't be the same
     // as the source one. This flag is used when generating final output like
     // filenames for URLs where we won't be interpreting as a URL and want to do
     // as much unescaping as possible.
     URL_SPECIAL_CHARS_EXCEPT_PATH_SEPARATORS = 1 << 3,

     // URL queries use "+" for space. This flag controls that replacement.
     REPLACE_PLUS_WITH_SPACE = 1 << 4,
   };
 };

 // Unescapes |escaped_text| and returns the result.
 // Unescaping consists of looking for the exact pattern "%XX", where each X is
 // a hex digit, and converting to the character with the numerical value of
 // those digits. Thus "i%20=%203%3b" unescapes to "i = 3;", if the
 // "UnescapeRule::SPACES" used.
 //
 // This method does not ensure that the output is a valid string using any
 // character encoding. However, it does leave escaped certain byte sequences
 // that would be dangerous to display to the user, because if interpreted as
 // UTF-8, they could be used to mislead the user. Callers that want to
 // unconditionally unescape everything for uses other than displaying data to
 // the user should use UnescapeBinaryURLComponent().
 NET_EXPORT std::string UnescapeURLComponent(base::StringPiece escaped_text,
                                             UnescapeRule::Type rules);

 // Unescapes the given substring as a URL, and then tries to interpret the
 // result as being encoded as UTF-8. If the result is convertible into UTF-8, it
 // will be returned as converted. If it is not, the original escaped string will
 // be converted into a base::string16 and returned.  |adjustments| provides
 // information on how the original string was adjusted to get the string
 // returned.
 NET_EXPORT base::string16 UnescapeAndDecodeUTF8URLComponent(
     base::StringPiece text,
     UnescapeRule::Type rules);
 NET_EXPORT base::string16 UnescapeAndDecodeUTF8URLComponentWithAdjustments(
     base::StringPiece text,
     UnescapeRule::Type rules,
     base::OffsetAdjuster::Adjustments* adjustments);

 // Unescapes a component of a URL for use as binary data. Unlike
 // UnescapeURLComponent, leaves nothing unescaped, including nulls, invalid
 // characters, characters that are unsafe to display, etc. This should *not*
 // be used when displaying the decoded data to the user.
 //
 // Only the NORMAL and REPLACE_PLUS_WITH_SPACE rules are allowed.
 // |escaped_text| and |unescaped_text| can be the same string.
 NET_EXPORT void UnescapeBinaryURLComponent(const std::string& escaped_text,
                                            UnescapeRule::Type rules,
                                            std::string* unescaped_text);
 NET_EXPORT inline void UnescapeBinaryURLComponent(
     const std::string& escaped_text,
     std::string* unescaped_text) {
   UnescapeBinaryURLComponent(escaped_text, UnescapeRule::NORMAL,
                              unescaped_text);
 }

 // Unescapes the following ampersand character codes from |text|:
 // &lt; &gt; &amp; &quot; &#39;
 NET_EXPORT base::string16 UnescapeForHTML(base::StringPiece16 text);

 // Returns true if |escaped_text| contains any element of |bytes| in
 // percent-encoded form.
 //
 // For example, if |bytes| is {'%', '/'}, returns true if |escaped_text|
 // contains "%25" or "%2F", but not if it just contains bare '%' or '/'
 // characters.
 NET_EXPORT bool ContainsEncodedBytes(base::StringPiece escaped_text,
                                      const std::set<unsigned char>& bytes);

 }  // namespace net

 #endif  // NET_BASE_ESCAPE_H_
	// 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.

	#ifndef NET_BASE_ESCAPE_H_
	#define NET_BASE_ESCAPE_H_

	#include <set>
	#include <string>

	#include "base/strings/string16.h"
	#include "base/strings/string_piece.h"
	#include "base/strings/utf_offset_string_conversions.h"
	#include "net/base/net_export.h"
	#include "starboard/types.h"

	namespace net {

	// Escaping --------------------------------------------------------------------

	// Escapes all characters except unreserved characters. Unreserved characters,
	// as defined in RFC 3986, include alphanumerics and -._~
	NET_EXPORT std::string EscapeAllExceptUnreserved(base::StringPiece text);

	// Escapes characters in text suitable for use as a query parameter value.
	// We %XX everything except alphanumerics and -_.!~*'()
	// Spaces change to "+" unless you pass usePlus=false.
	// This is basically the same as encodeURIComponent in javascript.
	NET_EXPORT std::string EscapeQueryParamValue(base::StringPiece text,
	bool use_plus);

	// Escapes a partial or complete file/pathname. This includes:
	// non-printable, non-7bit, and (including space) "#%:<>?[\]^`{\|}
	NET_EXPORT std::string EscapePath(base::StringPiece path);

	#if defined(OS_MACOSX)
	// Escapes characters as per expectations of NSURL. This includes:
	// non-printable, non-7bit, and (including space) "#%<>[\]^`{\|}
	NET_EXPORT std::string EscapeNSURLPrecursor(base::StringPiece precursor);
	#endif // defined(OS_MACOSX)

	// Escapes application/x-www-form-urlencoded content. This includes:
	// non-printable, non-7bit, and (including space) ?>=<;+'&%$#"![\]^`{\|}
	// Space is escaped as + (if use_plus is true) and other special characters
	// as %XX (hex).
	NET_EXPORT std::string EscapeUrlEncodedData(base::StringPiece path,
	bool use_plus);

	// QUIC46
	// Escapes all non-ASCII input, as well as escaping % to %25.
	NET_EXPORT std::string EscapeNonASCIIAndPercent(base::StringPiece input);

	// Escapes all non-ASCII input.
	NET_EXPORT std::string EscapeNonASCII(base::StringPiece input);

	// Escapes characters in text suitable for use as an external protocol handler
	// command.
	// We %XX everything except alphanumerics and -_.!~*'() and the restricted
	// characters (;/?:@&=+$,#[]) and a valid percent escape sequence (%XX).
	NET_EXPORT std::string EscapeExternalHandlerValue(base::StringPiece text);

	// Appends the given character to the output string, escaping the character if
	// the character would be interpreted as an HTML delimiter.
	NET_EXPORT void AppendEscapedCharForHTML(char c, std::string* output);

	// Escapes chars that might cause this text to be interpreted as HTML tags.
	NET_EXPORT std::string EscapeForHTML(base::StringPiece text);
	NET_EXPORT base::string16 EscapeForHTML(base::StringPiece16 text);

	// Unescaping ------------------------------------------------------------------

	class UnescapeRule {
	public:
	// A combination of the following flags that is passed to the unescaping
	// functions.
	typedef uint32_t Type;

	enum {
	// Don't unescape anything at all.
	NONE = 0,

	// Don't unescape anything special, but all normal unescaping will happen.
	// This is a placeholder and can't be combined with other flags (since it's
	// just the absence of them). All other unescape rules imply "normal" in
	// addition to their special meaning. Things like escaped letters, digits,
	// and most symbols will get unescaped with this mode.
	NORMAL = 1 << 0,

	// Convert %20 to spaces. In some places where we're showing URLs, we may
	// want this. In places where the URL may be copied and pasted out, then
	// you wouldn't want this since it might not be interpreted in one piece
	// by other applications. Other UTF-8 spaces will not be unescaped.
	SPACES = 1 << 1,

	// Unescapes '/' and '\\'. If these characters were unescaped, the resulting
	// URL won't be the same as the source one. Moreover, they are dangerous to
	// unescape in strings that will be used as file paths or names. This value
	// should only be used when slashes don't have special meaning, like data
	// URLs.
	PATH_SEPARATORS = 1 << 2,

	// Unescapes various characters that will change the meaning of URLs,
	// including '%', '+', '&', '#'. Does not unescape path separators.
	// If these characters were unescaped, the resulting URL won't be the same
	// as the source one. This flag is used when generating final output like
	// filenames for URLs where we won't be interpreting as a URL and want to do
	// as much unescaping as possible.
	URL_SPECIAL_CHARS_EXCEPT_PATH_SEPARATORS = 1 << 3,

	// URL queries use "+" for space. This flag controls that replacement.
	REPLACE_PLUS_WITH_SPACE = 1 << 4,
	};
	};

	// Unescapes \|escaped_text\| and returns the result.
	// Unescaping consists of looking for the exact pattern "%XX", where each X is
	// a hex digit, and converting to the character with the numerical value of
	// those digits. Thus "i%20=%203%3b" unescapes to "i = 3;", if the
	// "UnescapeRule::SPACES" used.
	//
	// This method does not ensure that the output is a valid string using any
	// character encoding. However, it does leave escaped certain byte sequences
	// that would be dangerous to display to the user, because if interpreted as
	// UTF-8, they could be used to mislead the user. Callers that want to
	// unconditionally unescape everything for uses other than displaying data to
	// the user should use UnescapeBinaryURLComponent().
	NET_EXPORT std::string UnescapeURLComponent(base::StringPiece escaped_text,
	UnescapeRule::Type rules);

	// Unescapes the given substring as a URL, and then tries to interpret the
	// result as being encoded as UTF-8. If the result is convertible into UTF-8, it
	// will be returned as converted. If it is not, the original escaped string will
	// be converted into a base::string16 and returned. \|adjustments\| provides
	// information on how the original string was adjusted to get the string
	// returned.
	NET_EXPORT base::string16 UnescapeAndDecodeUTF8URLComponent(
	base::StringPiece text,
	UnescapeRule::Type rules);
	NET_EXPORT base::string16 UnescapeAndDecodeUTF8URLComponentWithAdjustments(
	base::StringPiece text,
	UnescapeRule::Type rules,
	base::OffsetAdjuster::Adjustments* adjustments);

	// Unescapes a component of a URL for use as binary data. Unlike
	// UnescapeURLComponent, leaves nothing unescaped, including nulls, invalid
	// characters, characters that are unsafe to display, etc. This should not
	// be used when displaying the decoded data to the user.
	//
	// Only the NORMAL and REPLACE_PLUS_WITH_SPACE rules are allowed.
	// \|escaped_text\| and \|unescaped_text\| can be the same string.
	NET_EXPORT void UnescapeBinaryURLComponent(const std::string& escaped_text,
	UnescapeRule::Type rules,
	std::string* unescaped_text);
	NET_EXPORT inline void UnescapeBinaryURLComponent(
	const std::string& escaped_text,
	std::string* unescaped_text) {
	UnescapeBinaryURLComponent(escaped_text, UnescapeRule::NORMAL,
	unescaped_text);
	}

	// Unescapes the following ampersand character codes from \|text\|:
	// < > & " '
	NET_EXPORT base::string16 UnescapeForHTML(base::StringPiece16 text);

	// Returns true if \|escaped_text\| contains any element of \|bytes\| in
	// percent-encoded form.
	//
	// For example, if \|bytes\| is {'%', '/'}, returns true if \|escaped_text\|
	// contains "%25" or "%2F", but not if it just contains bare '%' or '/'
	// characters.
	NET_EXPORT bool ContainsEncodedBytes(base::StringPiece escaped_text,
	const std::set<unsigned char>& bytes);

	} // namespace net

	#endif // NET_BASE_ESCAPE_H_