AuroraMiddleware/scuffed-code
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
82d931c474
scuffed-code/icu4c/source/tools/gensprep/store.c

680 lines
24 KiB
C
Raw Normal View History

ICU-3050 StringPrep API first cut X-SVN-Rev: 12674
2003-07-24 23:23:19 +00:00
/*
*******************************************************************************
*
* Copyright (C) 1999-2003, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: store.c
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2003-02-06
* created by: Ram Viswanadha
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "unicode/utypes.h"
#include "unicode/uchar.h"
#include "cmemory.h"
#include "cstring.h"
#include "filestrm.h"
#include "unicode/udata.h"
#include "utrie.h"
#include "unicode/uset.h"
#include "unewdata.h"
#include "gensprep.h"
#include "uhash.h"
#ifdef WIN32
# pragma warning(disable: 4100)
#endif
#define DO_DEBUG_OUT 0
ICU-3050 add documentation X-SVN-Rev: 12950
2003-08-27 00:02:02 +00:00
/*
* StringPrep profile file format ------------------------------------
*
* The file format prepared and written here contains a 16-bit trie and a mapping table.
*
* Before the data contents described below, there are the headers required by
* the udata API for loading ICU data. Especially, a UDataInfo structure
* precedes the actual data. It contains platform properties values and the
* file format version.
*
* The following is a description of format version 2.
*
* Data contents:
*
* The contents is a parsed, binary form of RFC3454 and possibly
* NormalizationCorrections.txt depending on the options specified on the profile.
*
* Any Unicode code point from 0 to 0x10ffff can be looked up to get
* the trie-word, if any, for that code point. This means that the input
* to the lookup are 21-bit unsigned integers, with not all of the
* 21-bit range used.
*
* *.spp files customarily begin with a UDataInfo structure, see udata.h and .c.
* After that there are the following structures:
*
ICU-2235 add swapping of StringPrep .spp profile data X-SVN-Rev: 13176
2003-09-23 21:07:16 +00:00
* int32_t indexes[_SPREP_INDEX_TOP]; -- _SPREP_INDEX_TOP=16, see enum in sprpimpl.h file
ICU-3050 add documentation X-SVN-Rev: 12950
2003-08-27 00:02:02 +00:00
*
* UTrie stringPrepTrie; -- size in bytes=indexes[_SPREP_INDEX_TRIE_SIZE]
*
* uint16_t mappingTable[]; -- Contains the sequecence of code units that the code point maps to
* size in bytes = indexes[_SPREP_INDEX_MAPPING_DATA_SIZE]
*
* The indexes array also contains the following values:
*
* indexes[_SPREP_NORM_CORRECTNS_LAST_UNI_VERSION] -- The index of Unicode version of last entry in NormalizationCorrections.txt
* indexes[_SPREP_ONE_UCHAR_MAPPING_INDEX_START] -- The starting index of 1 UChar mapping index in the mapping table
* indexes[_SPREP_TWO_UCHARS_MAPPING_INDEX_START] -- The starting index of 2 UChars mapping index in the mapping table
* indexes[_SPREP_THREE_UCHARS_MAPPING_INDEX_START] -- The starting index of 3 UChars mapping index in the mapping table
* indexes[_SPREP_FOUR_UCHARS_MAPPING_INDEX_START] -- The starting index of 4 UChars mapping index in the mapping table
* indexes[_SPREP_OPTIONS] -- Bit set of options to turn on in the profile, e.g: USPREP_NORMALIZATION_ON, USPREP_CHECK_BIDI_ON
*
*
* StringPrep Trie :
*
* The StringPrep tries is a 16-bit trie that contains data for the profile.
* Each code point is associated with a value (trie-word) in the trie.
*
* - structure of data words from the trie
*
* i) A value greater than _SPREP_TYPE_THRESHOLD (0xFFF0) represents the type associated with the code point
* if(trieWord > _SPREP_TYPE_THRESHOLD){
* type = trieWord - 0xFFF0;
* }
* The type can be :
* USPREP_UNASSIGNED
* USPREP_PROHIBITED
* USPREP_LABEL_SEPARATOR
* USPREP_DELETE
*
* ii) A value less than _SPREP_TYPE_THRESHOLD means the type is USPREP_MAP and
* contains distribution described below
*
* 0 - ON : The code point is prohibited (USPREP_PROHIBITED)
* 1 - ON : The value in the next 14 bits is an index into the mapping table
* OFF: The value in the next 14 bits is an delta value from the code point
* 2..15 - Contains data as described by bit 1. If all bits are set
* (value = _SPREP_MAX_INDEX_VALUE) then the type is USPREP_DELETE
*
*
* Mapping Table:
* The data in mapping table is sorted according to the length of the mapping sequence.
* If the type of the code point is USPREP_MAP and value in trie word is an index, the index
* is compared with start indexes of sequence length start to figure out the length according to
* the following algorithm:
*
* if( index >= indexes[_SPREP_ONE_UCHAR_MAPPING_INDEX_START] &&
* index < indexes[_SPREP_TWO_UCHARS_MAPPING_INDEX_START]){
* length = 1;
* }else if(index >= indexes[_SPREP_TWO_UCHARS_MAPPING_INDEX_START] &&
* index < indexes[_SPREP_THREE_UCHARS_MAPPING_INDEX_START]){
* length = 2;
* }else if(index >= indexes[_SPREP_THREE_UCHARS_MAPPING_INDEX_START] &&
* index < indexes[_SPREP_FOUR_UCHARS_MAPPING_INDEX_START]){
* length = 3;
* }else{
* // The first position in the mapping table contains the length
* // of the sequence
* length = mappingTable[index++];
*
* }
*
*/
ICU-3050 StringPrep API first cut X-SVN-Rev: 12674
2003-07-24 23:23:19 +00:00
/* file data ---------------------------------------------------------------- */
/* indexes[] value names */
#if UCONFIG_NO_IDNA
/* dummy UDataInfo cf. udata.h */
static UDataInfo dataInfo = {
sizeof(UDataInfo),
0,
U_IS_BIG_ENDIAN,
U_CHARSET_FAMILY,
U_SIZEOF_UCHAR,
0,
{ 0, 0, 0, 0 }, /* dummy dataFormat */
{ 0, 0, 0, 0 }, /* dummy formatVersion */
{ 0, 0, 0, 0 } /* dummy dataVersion */
};
#else
static int32_t indexes[_SPREP_INDEX_TOP]={ 0 };
static uint16_t* mappingData= NULL;
static int32_t mappingDataCapacity = 0; /* we skip the first index in mapping data */
static int16_t currentIndex = 0; /* the current index into the data trie */
static int32_t maxLength = 0; /* maximum length of mapping string */
/* UDataInfo cf. udata.h */
static UDataInfo dataInfo={
sizeof(UDataInfo),
0,
U_IS_BIG_ENDIAN,
U_CHARSET_FAMILY,
U_SIZEOF_UCHAR,
0,
{ 0x53, 0x50, 0x52, 0x50 }, /* dataFormat="SPRP" */
{ 3, 2, UTRIE_SHIFT, UTRIE_INDEX_SHIFT }, /* formatVersion */
{ 3, 2, 0, 0 } /* dataVersion (Unicode version) */
};
void
setUnicodeVersion(const char *v) {
UVersionInfo version;
u_versionFromString(version, v);
uprv_memcpy(dataInfo.dataVersion, version, 4);
}
void
setUnicodeVersionNC(UVersionInfo version){
uint32_t univer = version[0] << 24;
univer += version[1] << 16;
univer += version[2] << 8;
univer += version[3];
indexes[_SPREP_NORM_CORRECTNS_LAST_UNI_VERSION] = univer;
}
static UNewTrie *sprepTrie;
#define MAX_DATA_LENGTH 11500
#define SPREP_DELTA_RANGE_POSITIVE_LIMIT 8191
#define SPREP_DELTA_RANGE_NEGATIVE_LIMIT -8192
extern void
init() {
sprepTrie = (UNewTrie *)uprv_malloc(sizeof(UNewTrie));
uprv_memset(sprepTrie, 0, sizeof(UNewTrie));
/* initialize the two tries */
if(NULL==utrie_open(sprepTrie, NULL, MAX_DATA_LENGTH, 0, 0, FALSE)) {
fprintf(stderr, "error: failed to initialize tries\n");
exit(U_MEMORY_ALLOCATION_ERROR);
}
}
static UHashtable* hashTable = NULL;
struct ValueStruct {
UChar* mapping;
int16_t length;
UStringPrepType type;
};
typedef struct ValueStruct ValueStruct;
/* Callback for deleting the value from the hashtable */
void U_CALLCONV valueDeleter(void* obj){
ValueStruct* value = (ValueStruct*) obj;
uprv_free(value->mapping);
uprv_free(value);
}
/* Callback for hashing the entry */
static int32_t U_CALLCONV hashEntry(const UHashTok parm) {
return parm.integer;
}
/* Callback for comparing two entries */
static UBool U_CALLCONV compareEntries(const UHashTok p1, const UHashTok p2) {
return (UBool)(p1.integer != p2.integer);
}
static void
storeMappingData(){
int32_t pos = -1;
const UHashElement* element = NULL;
ValueStruct* value = NULL;
int32_t codepoint = 0;
int32_t elementCount = uhash_count(hashTable);
int32_t writtenElementCount = 0;
int32_t mappingLength = 1; /* minimum mapping length */
int32_t oldMappingLength = 0;
uint16_t trieWord =0;
int32_t limitIndex = 0;
/*initialize the mapping data */
mappingData = (uint16_t*) uprv_malloc(U_SIZEOF_UCHAR * (mappingDataCapacity));
uprv_memset(mappingData,0,U_SIZEOF_UCHAR * mappingDataCapacity);
while(writtenElementCount < elementCount){
while( (element = uhash_nextElement(hashTable, &pos))!=NULL){
codepoint = element->key.integer;
value = (ValueStruct*)element->value.pointer;
/* store the start of indexes */
if(oldMappingLength != mappingLength){
/* Assume that index[] is used according to the enums defined */
if(oldMappingLength <=_SPREP_MAX_INDEX_TOP_LENGTH){
indexes[_SPREP_NORM_CORRECTNS_LAST_UNI_VERSION+mappingLength] = currentIndex;
}
if(oldMappingLength <= _SPREP_MAX_INDEX_TOP_LENGTH &&
mappingLength == _SPREP_MAX_INDEX_TOP_LENGTH +1){
limitIndex = currentIndex;
}
oldMappingLength = mappingLength;
}
if(value->length == mappingLength){
uint32_t savedTrieWord = 0;
trieWord = currentIndex << 2;
/* turn on the 2nd bit to signal that the following bits contain an index */
trieWord += 0x02;
if(trieWord > _SPREP_TYPE_THRESHOLD){
fprintf(stderr,"trieWord cannot contain value greater than 0x%04X.\n",_SPREP_TYPE_THRESHOLD);
exit(U_ILLEGAL_CHAR_FOUND);
}
/* figure out if the code point has type already stored */
savedTrieWord= utrie_get32(sprepTrie,codepoint,NULL);
if(savedTrieWord!=0){
if((savedTrieWord- _SPREP_TYPE_THRESHOLD) == USPREP_PROHIBITED){
/* turn on the first bit in trie word */
trieWord += 0x01;
}else{
/*
* the codepoint has value something other than prohibited
* and a mapping .. error!
*/
fprintf(stderr,"Type for codepoint \\U%08X already set!.\n", codepoint);
exit(U_ILLEGAL_ARGUMENT_ERROR);
}
}
/* now set the value in the trie */
if(!utrie_set32(sprepTrie,codepoint,trieWord)){
fprintf(stderr,"Could not set the value for code point.\n");
exit(U_ILLEGAL_ARGUMENT_ERROR);
}
/* written the trie word for the codepoint... increment the count*/
writtenElementCount++;
/* sanity check are we exceeding the max number allowed */
if(currentIndex+value->length+1 > _SPREP_MAX_INDEX_VALUE){
fprintf(stderr, "Too many entries in the mapping table %i. Maximum allowed is %i\n", currentIndex+value->length, _SPREP_MAX_INDEX_VALUE);
exit(U_INDEX_OUTOFBOUNDS_ERROR);
}
/* copy the mapping data */
if(currentIndex+value->length+1 <= mappingDataCapacity){
/* write the length */
if(mappingLength > _SPREP_MAX_INDEX_TOP_LENGTH ){
/* the cast here is safe since we donot expect the length to be > 65535 */
mappingData[currentIndex++] = (uint16_t) mappingLength;
}
/* copy the contents to mappindData array */
uprv_memmove(mappingData+currentIndex, value->mapping, value->length*U_SIZEOF_UCHAR);
currentIndex += value->length;
}else{
/* realloc */
UChar* newMappingData = (uint16_t*) uprv_malloc(U_SIZEOF_UCHAR * mappingDataCapacity*2);
if(newMappingData == NULL){
fprintf(stderr, "Could not realloc the mapping data!\n");
exit(U_MEMORY_ALLOCATION_ERROR);
}
uprv_memmove(newMappingData, mappingData, U_SIZEOF_UCHAR * mappingDataCapacity);
mappingDataCapacity *= 2;
uprv_free(mappingData);
mappingData = newMappingData;
/* write the length */
if(mappingLength > _SPREP_MAX_INDEX_TOP_LENGTH ){
/* the cast here is safe since we donot expect the length to be > 65535 */
mappingData[currentIndex++] = (uint16_t) mappingLength;
}
/* continue copying */
uprv_memmove(mappingData+currentIndex, value->mapping, value->length*U_SIZEOF_UCHAR);
currentIndex += value->length;
}
}
}
mappingLength++;
pos = -1;
}
/* set the last length for range check */
if(mappingLength <= _SPREP_MAX_INDEX_TOP_LENGTH){
indexes[_SPREP_NORM_CORRECTNS_LAST_UNI_VERSION+mappingLength] = currentIndex+1;
}else{
indexes[_SPREP_FOUR_UCHARS_MAPPING_INDEX_START] = limitIndex;
}
}
extern void setOptions(int32_t options){
indexes[_SPREP_OPTIONS] = options;
}
extern void
storeMapping(uint32_t codepoint, uint32_t* mapping,int32_t length,
UStringPrepType type, UErrorCode* status){
UChar* map = NULL;
int16_t adjustedLen=0, i;
uint16_t trieWord = 0;
ValueStruct *value = NULL;
uint32_t savedTrieWord = 0;
/* initialize the hashtable */
if(hashTable==NULL){
hashTable = uhash_open(hashEntry, compareEntries, status);
uhash_setValueDeleter(hashTable, valueDeleter);
}
/* figure out if the code point has type already stored */
savedTrieWord= utrie_get32(sprepTrie,codepoint,NULL);
if(savedTrieWord!=0){
if((savedTrieWord- _SPREP_TYPE_THRESHOLD) == USPREP_PROHIBITED){
/* turn on the first bit in trie word */
trieWord += 0x01;
}else{
/*
* the codepoint has value something other than prohibited
* and a mapping .. error!
*/
fprintf(stderr,"Type for codepoint \\U%08X already set!.\n", codepoint);
exit(U_ILLEGAL_ARGUMENT_ERROR);
}
}
/* figure out the real length */
for(i=0; i<length; i++){
if(mapping[i] > 0xFFFF){
adjustedLen +=2;
}else{
adjustedLen++;
}
}
if(adjustedLen == 0){
trieWord = (uint16_t)(_SPREP_MAX_INDEX_VALUE << 2);
/* make sure that the value of trieWord is less than the threshold */
if(trieWord < _SPREP_TYPE_THRESHOLD){
/* now set the value in the trie */
if(!utrie_set32(sprepTrie,codepoint,trieWord)){
fprintf(stderr,"Could not set the value for code point.\n");
exit(U_ILLEGAL_ARGUMENT_ERROR);
}
/* value is set so just return */
return;
}else{
fprintf(stderr,"trieWord cannot contain value greater than threshold 0x%04X.\n",_SPREP_TYPE_THRESHOLD);
exit(U_ILLEGAL_CHAR_FOUND);
}
}
if(adjustedLen == 1){
/* calculate the delta */
ICU-3050 Fix MSVC.NET warning X-SVN-Rev: 12852
2003-08-17 08:04:31 +00:00
int16_t delta = (int16_t)((int32_t)codepoint - (int16_t) mapping[0]);
ICU-3050 StringPrep API first cut X-SVN-Rev: 12674
2003-07-24 23:23:19 +00:00
if(delta >= SPREP_DELTA_RANGE_NEGATIVE_LIMIT && delta <= SPREP_DELTA_RANGE_POSITIVE_LIMIT){
trieWord = delta << 2;
/* make sure that the second bit is OFF */
if((trieWord & 0x02) != 0 ){
fprintf(stderr,"The second bit in the trie word is not zero while storing a delta.\n");
exit(U_INTERNAL_PROGRAM_ERROR);
}
/* make sure that the value of trieWord is less than the threshold */
if(trieWord < _SPREP_TYPE_THRESHOLD){
/* now set the value in the trie */
if(!utrie_set32(sprepTrie,codepoint,trieWord)){
fprintf(stderr,"Could not set the value for code point.\n");
exit(U_ILLEGAL_ARGUMENT_ERROR);
}
/* value is set so just return */
return;
}
}
/*
* if the delta is not in the given range or if the trieWord is larger than the threshold
* just fall through for storing the mapping in the mapping table
*/
}
map = (UChar*) uprv_malloc(U_SIZEOF_UCHAR * (adjustedLen+1));
uprv_memset(map,0,U_SIZEOF_UCHAR * (adjustedLen+1));
i=0;
while(i<length){
if(mapping[i] <= 0xFFFF){
map[i] = (uint16_t)mapping[i];
}else{
map[i] = UTF16_LEAD(mapping[i]);
map[i+1] = UTF16_TRAIL(mapping[i]);
}
i++;
}
value = (ValueStruct*) uprv_malloc(sizeof(ValueStruct));
value->mapping = map;
value->type = type;
value->length = adjustedLen;
if(value->length > _SPREP_MAX_INDEX_TOP_LENGTH){
mappingDataCapacity++;
}
if(maxLength < value->length){
maxLength = value->length;
}
uhash_iput(hashTable,codepoint,value,status);
mappingDataCapacity += adjustedLen;
if(U_FAILURE(*status)){
fprintf(stderr, "Failed to put entries into the hastable. Error: %s\n", u_errorName(*status));
exit(*status);
}
}
extern void
storeRange(uint32_t start, uint32_t end, UStringPrepType type,UErrorCode* status){
uint16_t trieWord = 0;
uint32_t i=0;
trieWord += (_SPREP_TYPE_THRESHOLD + type); /* the top 4 bits contain the value */
if(trieWord > 0xFFFF){
fprintf(stderr,"trieWord cannot contain value greater than 0xFFFF.\n");
exit(U_ILLEGAL_CHAR_FOUND);
}
if(start == end){
uint32_t savedTrieWord = utrie_get32(sprepTrie, start, NULL);
if(savedTrieWord>0){
if(savedTrieWord < _SPREP_TYPE_THRESHOLD && type == USPREP_PROHIBITED){
/*
* A mapping is stored in the trie word
* and the only other possible type that a
* code point can have is USPREP_PROHIBITED
*
*/
/* turn on the 0th bit in the savedTrieWord */
savedTrieWord += 0x01;
/* the downcast is safe since we only save 16 bit values */
trieWord = (uint16_t)savedTrieWord;
/* make sure that the value of trieWord is less than the threshold */
if(trieWord < _SPREP_TYPE_THRESHOLD){
/* now set the value in the trie */
if(!utrie_set32(sprepTrie,start,trieWord)){
fprintf(stderr,"Could not set the value for code point.\n");
exit(U_ILLEGAL_ARGUMENT_ERROR);
}
/* value is set so just return */
return;
}else{
fprintf(stderr,"trieWord cannot contain value greater than threshold 0x%04X.\n",_SPREP_TYPE_THRESHOLD);
exit(U_ILLEGAL_CHAR_FOUND);
}
}else if(savedTrieWord != trieWord){
fprintf(stderr,"Value for codepoint \\U%08X already set!.\n", start);
exit(U_ILLEGAL_ARGUMENT_ERROR);
}
/* if savedTrieWord == trieWord .. fall through and set the value */
}
if(!utrie_set32(sprepTrie,start,trieWord)){
fprintf(stderr,"Could not set the value for code point \\U%08X.\n", start);
exit(U_ILLEGAL_ARGUMENT_ERROR);
}
}else{
if(!utrie_setRange32(sprepTrie, start, end+1, trieWord, FALSE)){
fprintf(stderr,"Value for certain codepoint already set.\n");
exit(U_ILLEGAL_CHAR_FOUND);
}
}
}
/* folding value: just store the offset (16 bits) if there is any non-0 entry */
static uint32_t U_CALLCONV
getFoldedValue(UNewTrie *trie, UChar32 start, int32_t offset) {
uint32_t foldedValue, value;
UChar32 limit=0;
UBool inBlockZero;
foldedValue=0;
limit=start+0x400;
while(start<limit) {
value=utrie_get32(trie, start, &inBlockZero);
if(inBlockZero) {
start+=UTRIE_DATA_BLOCK_LENGTH;
} else if(value!=0) {
return (uint32_t)offset;
} else {
++start;
}
}
return 0;
}
#endif /* #if !UCONFIG_NO_IDNA */
extern void
generateData(const char *dataDir, const char *packageName, const char* bundleName) {
static uint8_t sprepTrieBlock[100000];
UNewDataMemory *pData;
UErrorCode errorCode=U_ZERO_ERROR;
int32_t size, dataLength;
char* fileName = (char*) uprv_malloc(uprv_strlen(bundleName) +100);
#if UCONFIG_NO_IDNA
size=0;
#else
int32_t sprepTrieSize;
/* sort and add mapping data */
storeMappingData();
sprepTrieSize=utrie_serialize(sprepTrie, sprepTrieBlock, sizeof(sprepTrieBlock), getFoldedValue, TRUE, &errorCode);
if(U_FAILURE(errorCode)) {
fprintf(stderr, "error: utrie_serialize(sprep trie) failed, %s\n", u_errorName(errorCode));
exit(errorCode);
}
size = sprepTrieSize + mappingDataCapacity*U_SIZEOF_UCHAR + sizeof(indexes);
if(beVerbose) {
printf("size of sprep trie %5u bytes\n", sprepTrieSize);
printf("size of " U_ICUDATA_NAME "_%s." DATA_TYPE " contents: %ld bytes\n", bundleName,(long)size);
printf("size of mapping data array %5u bytes\n",mappingDataCapacity * U_SIZEOF_UCHAR);
printf("Number of code units in mappingData (currentIndex) are: %i \n", currentIndex);
printf("Maximum length of the mapping string is : %i \n", maxLength);
}
#endif
uprv_strcpy(fileName,packageName);
uprv_strcat(fileName,"_");
uprv_strcat(fileName,bundleName);
/* write the data */
pData=udata_create(dataDir, DATA_TYPE, fileName, &dataInfo,
haveCopyright ? U_COPYRIGHT_STRING : NULL, &errorCode);
if(U_FAILURE(errorCode)) {
fprintf(stderr, "gensprep: unable to create the output file, error %d\n", errorCode);
exit(errorCode);
}
#if !UCONFIG_NO_IDNA
indexes[_SPREP_INDEX_TRIE_SIZE]=sprepTrieSize;
indexes[_SPREP_INDEX_MAPPING_DATA_SIZE]=mappingDataCapacity*U_SIZEOF_UCHAR;
udata_writeBlock(pData, indexes, sizeof(indexes));
udata_writeBlock(pData, sprepTrieBlock, sprepTrieSize);
udata_writeBlock(pData, mappingData, indexes[_SPREP_INDEX_MAPPING_DATA_SIZE]);
#endif
/* finish up */
dataLength=udata_finish(pData, &errorCode);
if(U_FAILURE(errorCode)) {
fprintf(stderr, "gensprep: error %d writing the output file\n", errorCode);
exit(errorCode);
}
if(dataLength!=size) {
fprintf(stderr, "gensprep error: data length %ld != calculated size %ld\n",
(long)dataLength, (long)size);
exit(U_INTERNAL_PROGRAM_ERROR);
}
/* done with writing the data .. close the hashtable */
uhash_close(hashTable);
}
#if !UCONFIG_NO_IDNA
extern void
cleanUpData(void) {
utrie_close(sprepTrie);
uprv_free(sprepTrie);
}
#endif /* #if !UCONFIG_NO_IDNA */
/*
* Hey, Emacs, please set the following:
*
* Local Variables:
* indent-tabs-mode: nil
* End:
*
*/
Reference in New Issue Copy Permalink