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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.
//
////////////////////////////////////////////////////////////////////////////////
#include "compact_enc_det_hint_code.h"
#include <ctype.h> // for isalpha
#include <string.h> // for NULL, memchr, strlen, etc
#include "util/basictypes.h" // for uint8, uint32
#include "util/string_util.h"
// Upper to lower, keep digits, everything else to minus '-' (2d)
static const char kCharsetToLowerTbl[256] = {
0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d, 0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,
0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d, 0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,
0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d, 0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37, 0x38,0x39,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,
0x2d,0x61,0x62,0x63,0x64,0x65,0x66,0x67, 0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77, 0x78,0x79,0x7a,0x2d,0x2d,0x2d,0x2d,0x2d,
0x2d,0x61,0x62,0x63,0x64,0x65,0x66,0x67, 0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77, 0x78,0x79,0x7a,0x2d,0x2d,0x2d,0x2d,0x2d,
0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d, 0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,
0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d, 0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,
0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d, 0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,
0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d, 0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,
0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d, 0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,
0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d, 0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,
0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d, 0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,
0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d, 0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,
};
static const char kIsAlpha[256] = {
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,0,0,0,0,0,
0,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
};
static const char kIsDigit[256] = {
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 1,1,1,1,1,1,1,1, 1,1,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
};
static const char* kFakeEncodingName[] = {
"FakeEnc100", "FakeEnc101", "FakeEnc102", "FakeEnc103", "FakeEnc104",
"FakeEnc105", "FakeEnc106", "FakeEnc107", "FakeEnc108", "FakeEnc109",
"FakeEnc110", "FakeEnc111", "FakeEnc112", "FakeEnc113", "FakeEnc114",
"FakeEnc115", "FakeEnc116", "FakeEnc117", "FakeEnc118", "FakeEnc119",
};
static const char* kFakeEncodingName2[] = {
"FakeEnc_0", "FakeEnc_1", "FakeEnc_2", "FakeEnc_3", "FakeEnc_4",
};
// Return name for extended encoding
const char* MyEncodingName(Encoding enc) {
if (enc < 0) {
return "~";
}
if (enc == ISO_8859_1) {
return "Latin1"; // I can't stand "ASCII" for this
}
if (enc < NUM_ENCODINGS) {
return EncodingName(enc);
}
// allow fake names, for exploration
if ((NUM_ENCODINGS <= enc) && (enc < (NUM_ENCODINGS + 4))) {
return kFakeEncodingName2[enc - NUM_ENCODINGS];
}
if ((100 <= enc) && (enc < 120)) {
return kFakeEncodingName[enc - 100];
}
return "~";
}
// Normalize ASCII string to first 4 alphabetic chars and last 4 digit chars
// Letters are forced to lowercase ASCII
// Used to normalize charset= values
string MakeChar44(const string& str) {
string res("________"); // eight underscores
int l_ptr = 0;
int d_ptr = 0;
for (uint32 i = 0; i < str.size(); ++i) {
uint8 uc = static_cast<uint8>(str[i]);
if (kIsAlpha[uc]) {
if (l_ptr < 4) { // Else ignore
res[l_ptr] = kCharsetToLowerTbl[uc];
l_ptr++;
}
} else if (kIsDigit[uc]) {
if (d_ptr < 4) {
res[4 + d_ptr] = kCharsetToLowerTbl[uc];
} else {
// Keep last 4 digits by shifting left
res[4] = res[5];
res[5] = res[6];
res[6] = res[7];
res[7] = kCharsetToLowerTbl[uc];
}
d_ptr++;
} // If neither letter nor digit, drop entirely
}
return res;
}
// Normalize ASCII string to first 8 alphabetic/digit chars
// Letters are forced to lowercase ASCII
// Used to normalize TLD values
string MakeChar4(const string& str) {
string res("____"); // four underscores
int l_ptr = 0;
for (uint32 i = 0; i < str.size(); ++i) {
uint8 uc = static_cast<uint8>(str[i]);
if (kIsAlpha[uc] | kIsDigit[uc]) {
if (l_ptr < 4) { // Else ignore
res[l_ptr] = kCharsetToLowerTbl[uc];
l_ptr++;
}
}
}
return res;
}
// Normalize ASCII string to first 8 alphabetic/digit chars
// Letters are forced to lowercase ASCII
// Used to normalize TLD values
string MakeChar8(const string& str) {
string res("________"); // eight dots
int l_ptr = 0;
for (uint32 i = 0; i < str.size(); ++i) {
uint8 uc = static_cast<uint8>(str[i]);
if (kIsAlpha[uc] | kIsDigit[uc]) {
if (l_ptr < 8) { // Else ignore
res[l_ptr] = kCharsetToLowerTbl[uc];
l_ptr++;
}
}
}
return res;
}
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