[Rework] Use google-ced instead of libicu chardet as the former sucks

1 files changed, 299 insertions, 0 deletions

diff --git a/contrib/google-ced/util/encodings/encodings.h b/contrib/google-ced/util/encodings/encodings.h
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+++ b/contrib/google-ced/util/encodings/encodings.h
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+// Copyright 2016 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef UTIL_ENCODINGS_ENCODINGS_H_
+#define UTIL_ENCODINGS_ENCODINGS_H_
+
+// This interface defines the Encoding enum and various functions that
+// depend only on Encoding values.
+
+// A hash-function for Encoding, hash<Encoding>, is defined in
+// i18n/encodings/public/encodings-hash.h
+
+// On some Windows projects, UNICODE may be defined, which would prevent the
+// Encoding enum below from compiling. Note that this is a quick fix that does
+// not break any existing projects. The UNICODE enum may someday be changed
+// to something more specific and non-colliding, but this involves careful
+// testing of changes in many other projects.
+#undef UNICODE
+
+// NOTE: The Encoding enum must always start at 0. This assumption has
+// been made and used.
+
+#ifndef SWIG
+
+#include "util/encodings/encodings.pb.h"
+
+#else
+
+// TODO: Include a SWIG workaround header file.
+
+#endif
+
+const int kNumEncodings = NUM_ENCODINGS;
+
+// some of the popular encoding aliases
+// TODO: Make these static const Encoding values instead of macros.
+#define LATIN1           ISO_8859_1
+#define LATIN2           ISO_8859_2
+#define LATIN3           ISO_8859_3
+#define LATIN4           ISO_8859_4
+#define CYRILLIC         ISO_8859_5
+#define ARABIC_ENCODING  ISO_8859_6     // avoiding the same name as language
+#define GREEK_ENCODING   ISO_8859_7     // avoiding the same name as language
+#define HEBREW_ENCODING  ISO_8859_8     // avoiding the same name as language
+#define LATIN5           ISO_8859_9
+#define LATIN6           ISO_8859_10
+#define KOREAN_HANGUL    KOREAN_EUC_KR
+
+// The default Encoding (LATIN1).
+Encoding default_encoding();
+
+
+
+// *************************************************************
+// Encoding predicates
+//   IsValidEncoding()
+//   IsEncEncCompatible
+//   IsSupersetOfAscii7Bit
+//   Is8BitEncoding
+//   IsCJKEncoding
+//   IsHebrewEncoding
+//   IsRightToLeftEncoding
+//   IsLogicalRightToLeftEncoding
+//   IsVisualRightToLeftEncoding
+//   IsIso2022Encoding
+//   IsIso2022JpOrVariant
+//   IsShiftJisOrVariant
+//   IsJapaneseCellPhoneCarrierSpecificEncoding
+// *************************************************************
+
+// IsValidEncoding
+// ===================================
+//
+// Function to check if the input language enum is within range.
+//
+
+bool IsValidEncoding(Encoding enc);
+
+//
+// IsEncEncCompatible
+// ------------------
+//
+// This function is to determine whether or not converting from the
+// first encoding to the second requires any changes to the underlying
+// text (e.g.  ASCII_7BIT is a subset of UTF8).
+//
+// TODO: the current implementation is likely incomplete.  It would be
+// good to consider the full matrix of all pairs of encodings and to fish out
+// all compatible pairs.
+//
+bool IsEncEncCompatible(const Encoding from, const Encoding to);
+
+// To be a superset of 7-bit Ascii means that bytes 0...127 in the given
+// encoding represent the same characters as they do in ISO_8859_1.
+
+// WARNING: This function does not currently return true for all encodings that
+// are supersets of Ascii 7-bit.
+bool IsSupersetOfAscii7Bit(Encoding e);
+
+// To be an 8-bit encoding means that there are fewer than 256 symbols.
+// Each byte determines a new character; there are no multi-byte sequences.
+
+// WARNING: This function does not currently return true for all encodings that
+// are 8-bit encodings.
+bool Is8BitEncoding(Encoding e);
+
+// IsCJKEncoding
+// -------------
+//
+// This function returns true if the encoding is either Chinese
+// (simplified or traditional), Japanese, or Korean. Note: UTF8 is not
+// considered a CJK encoding.
+bool IsCJKEncoding(Encoding e);
+
+// IsHebrewEncoding
+// -------------
+//
+// This function returns true if the encoding is a Hebrew specific
+// encoding (not UTF8, etc).
+bool IsHebrewEncoding(Encoding e);
+
+// IsRightToLeftEncoding
+// ---------------------
+//
+// Returns true if the encoding is a right-to-left encoding.
+//
+// Note that the name of this function is somewhat misleading. There is nothing
+// "right to left" about these encodings. They merely contain code points for
+// characters in RTL languages such as Hebrew and Arabic. But this is also
+// true for UTF-8.
+//
+// TODO: Get rid of this function. The only special-case we
+// should need to worry about are visual encodings. Anything we
+// need to do for all 'RTL' encodings we need to do for UTF-8 as well.
+bool IsRightToLeftEncoding(Encoding enc);
+
+// IsLogicalRightToLeftEncoding
+// ----------------------------
+//
+// Returns true if the encoding is a logical right-to-left encoding.
+// Logical right-to-left encodings are those that the browser renders
+// right-to-left and applies the BiDi algorithm to. Therefore the characters
+// appear in reading order in the file, and indexing, snippet generation etc.
+// should all just work with no special processing.
+//
+// TODO: Get rid of this function. The only special-case we
+// should need to worry about are visual encodings.
+bool IsLogicalRightToLeftEncoding(Encoding enc);
+
+// IsVisualRightToLeftEncoding
+// ---------------------------
+//
+// Returns true if the encoding is a visual right-to-left encoding.
+// Visual right-to-left encodings are those that the browser renders
+// left-to-right and does not apply the BiDi algorithm to. Therefore each
+// line appears in reverse order in the file, lines are manually wrapped
+// by abusing <br> or <p> tags, etc. Visual RTL encoding is a relic of
+// the prehistoric days when browsers couldn't render right-to-left, but
+// unfortunately some visual pages persist to this day. These documents require
+// special processing so that we don't index or snippet them with each line
+// reversed.
+bool IsVisualRightToLeftEncoding(Encoding enc);
+
+// IsIso2022Encoding
+// -----------------
+//
+// Returns true if the encoding is a kind of ISO 2022 such as
+// ISO-2022-JP.
+bool IsIso2022Encoding(Encoding enc);
+
+// IsIso2022JpOrVariant
+// --------------------
+//
+// Returns true if the encoding is ISO-2022-JP or a variant such as
+// KDDI's ISO-2022-JP.
+bool IsIso2022JpOrVariant(Encoding enc);
+
+// IsShiftJisOrVariant
+// --------------------
+//
+// Returns true if the encoding is Shift_JIS or a variant such as
+// KDDI's Shift_JIS.
+bool IsShiftJisOrVariant(Encoding enc);
+
+// IsJapanesCellPhoneCarrierSpecificEncoding
+// -----------------------------------------
+//
+// Returns true if it's Japanese cell phone carrier specific encoding
+// such as KDDI_SHIFT_JIS.
+bool IsJapaneseCellPhoneCarrierSpecificEncoding(Encoding enc);
+
+
+
+// *************************************************************
+// ENCODING NAMES
+//
+// This interface defines a standard name for each valid encoding, and
+// a standard name for invalid encodings. (Some names use all upper
+// case, but others use mixed case.)
+//
+//   EncodingName() [Encoding to name]
+//   MimeEncodingName() [Encoding to name]
+//   EncodingFromName() [name to Encoding]
+//   EncodingNameAliasToEncoding() [name to Encoding]
+//   default_encoding_name()
+//   invalid_encoding_name()
+// *************************************************************
+
+// EncodingName
+// ------------
+//
+// Given the encoding, returns its standard name.
+// Return invalid_encoding_name() if the encoding is invalid.
+//
+const char* EncodingName(Encoding enc);
+
+//
+// MimeEncodingName
+// ----------------
+//
+// Return the "preferred MIME name" of an encoding.
+//
+// This name is suitable for using in HTTP headers, HTML tags,
+// and as the "charset" parameter of a MIME Content-Type.
+const char* MimeEncodingName(Encoding enc);
+
+
+// The maximum length of an encoding name
+const int kMaxEncodingNameSize = 50;
+
+// The standard name of the default encoding.
+const char* default_encoding_name();
+
+// The name used for an invalid encoding.
+const char* invalid_encoding_name();
+
+// EncodingFromName
+// ----------------
+//
+// If enc_name matches the standard name of an Encoding, using a
+// case-insensitive comparison, set *encoding to that Encoding and
+// return true.  Otherwise set *encoding to UNKNOWN_ENCODING and
+// return false.
+//
+// REQUIRES: encoding must not be NULL.
+//
+bool EncodingFromName(const char* enc_name, Encoding *encoding);
+
+//
+// EncodingNameAliasToEncoding
+// ---------------------------
+//
+// If enc_name matches the standard name or an alias of an Encoding,
+// using a case-insensitive comparison, return that
+// Encoding. Otherwise, return UNKNOWN_ENCODING.
+//
+// Aliases include most mime-encoding names (e.g., "ISO-8859-7" for
+// GREEK), alternate names (e.g., "cyrillic" for ISO_8859_5) and
+// common variations with hyphens and underscores (e.g., "koi8-u" and
+// "koi8u" for RUSSIAN_KOI8_R).
+
+Encoding EncodingNameAliasToEncoding(const char *enc_name);
+
+// *************************************************************
+// Miscellany
+// *************************************************************
+
+// PreferredWebOutputEncoding
+// --------------------------
+//
+// Some multi-byte encodings use byte values that coincide with the
+// ASCII codes for HTML syntax characters <>"&' and browsers like MSIE
+// can misinterpret these, as indicated in an external XSS report from
+// 2007-02-15. Here, we map these dangerous encodings to safer ones. We
+// also use UTF8 instead of encodings that we don't support in our
+// output, and we generally try to be conservative in what we send out.
+// Where the client asks for single- or double-byte encodings that are
+// not as common, we substitute a more common single- or double-byte
+// encoding, if there is one, thereby preserving the client's intent
+// to use less space than UTF-8. This also means that characters
+// outside the destination set will be converted to HTML NCRs (&#NNN;)
+// if requested.
+Encoding PreferredWebOutputEncoding(Encoding enc);
+
+
+#endif  // UTIL_ENCODINGS_ENCODINGS_H_