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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+ *******************************************************************************
+ *   Copyright (C) 2003-2013, International Business Machines
+ *   Corporation and others.  All Rights Reserved.
+ *******************************************************************************
+ *   file name:  ucm.h
+ *   encoding:   UTF-8
+ *   tab size:   8 (not used)
+ *   indentation:4
+ *
+ *   created on: 2003jun20
+ *   created by: Markus W. Scherer
+ *
+ *   Definitions for the .ucm file parser and handler module ucm.c.
+ */
+
+#ifndef __UCM_H__
+#define __UCM_H__
+
+#include "unicode/utypes.h"
+#include "ucnvmbcs.h"
+#include "ucnv_ext.h"
+#include "filestrm.h"
+#include <stdio.h>
+
+#if !UCONFIG_NO_CONVERSION
+
+U_CDECL_BEGIN
+
+/* constants for UCMapping.moveFlag */
+enum {
+    UCM_MOVE_TO_EXT=1,
+    UCM_REMOVE_MAPPING=2
+};
+
+/*
+ * Per-mapping data structure
+ *
+ * u if uLen==1: Unicode code point
+ *   else index to uLen code points
+ * b if bLen<=4: up to 4 bytes
+ *   else index to bLen bytes
+ * uLen number of code points
+ * bLen number of words containing left-justified bytes
+ * bIsMultipleChars indicates that the bytes contain more than one sequence
+ *                  according to the state table
+ * f flag for roundtrip (0), fallback (1), sub mapping (2), reverse fallback (3)
+ *   or "good one-way" mapping (4).
+ *   Same values as in the source file after |
+ */
+typedef struct UCMapping {
+    UChar32 u;
+    union {
+        uint32_t idx;
+        uint8_t bytes[4];
+    } b;
+    int8_t uLen, bLen, f, moveFlag;
+} UCMapping;
+
+/* constants for UCMTable.flagsType */
+enum {
+    UCM_FLAGS_INITIAL,  /* no mappings parsed yet */
+    UCM_FLAGS_EXPLICIT, /* .ucm file has mappings with | fallback indicators */
+    UCM_FLAGS_IMPLICIT, /* .ucm file has mappings without | fallback indicators, later wins */
+    UCM_FLAGS_MIXED     /* both implicit and explicit */
+};
+
+typedef struct UCMTable {
+    UCMapping *mappings;
+    int32_t mappingsCapacity, mappingsLength;
+
+    UChar32 *codePoints;
+    int32_t codePointsCapacity, codePointsLength;
+
+    uint8_t *bytes;
+    int32_t bytesCapacity, bytesLength;
+
+    /* index map for mapping by bytes first */
+    int32_t *reverseMap;
+
+    uint8_t unicodeMask;
+    int8_t flagsType; /* UCM_FLAGS_INITIAL etc. */
+    UBool isSorted;
+} UCMTable;
+
+enum {
+    MBCS_STATE_FLAG_DIRECT=1,
+    MBCS_STATE_FLAG_SURROGATES,
+
+    MBCS_STATE_FLAG_READY=16
+};
+
+typedef struct UCMStates {
+    int32_t stateTable[MBCS_MAX_STATE_COUNT][256];
+    uint32_t stateFlags[MBCS_MAX_STATE_COUNT],
+             stateOffsetSum[MBCS_MAX_STATE_COUNT];
+
+    int32_t countStates, minCharLength, maxCharLength, countToUCodeUnits;
+    int8_t conversionType, outputType;
+} UCMStates;
+
+typedef struct UCMFile {
+    UCMTable *base, *ext;
+    UCMStates states;
+
+    char baseName[UCNV_MAX_CONVERTER_NAME_LENGTH];
+} UCMFile;
+
+/* simple accesses ---------------------------------------------------------- */
+
+#define UCM_GET_CODE_POINTS(t, m) \
+    (((m)->uLen==1) ? &(m)->u : (t)->codePoints+(m)->u)
+
+#define UCM_GET_BYTES(t, m) \
+    (((m)->bLen<=4) ? (m)->b.bytes : (t)->bytes+(m)->b.idx)
+
+/* APIs --------------------------------------------------------------------- */
+
+U_CAPI UCMFile * U_EXPORT2
+ucm_open(void);
+
+U_CAPI void U_EXPORT2
+ucm_close(UCMFile *ucm);
+
+U_CAPI UBool U_EXPORT2
+ucm_parseHeaderLine(UCMFile *ucm,
+                    char *line, char **pKey, char **pValue);
+
+/* @return -1 illegal bytes  0 suitable for base table  1 needs to go into extension table */
+U_CAPI int32_t U_EXPORT2
+ucm_mappingType(UCMStates *baseStates,
+                UCMapping *m,
+                UChar32 codePoints[UCNV_EXT_MAX_UCHARS],
+                uint8_t bytes[UCNV_EXT_MAX_BYTES]);
+
+/* add a mapping to the base or extension table as appropriate */
+U_CAPI UBool U_EXPORT2
+ucm_addMappingAuto(UCMFile *ucm, UBool forBase, UCMStates *baseStates,
+                   UCMapping *m,
+                   UChar32 codePoints[UCNV_EXT_MAX_UCHARS],
+                   uint8_t bytes[UCNV_EXT_MAX_BYTES]);
+
+U_CAPI UBool U_EXPORT2
+ucm_addMappingFromLine(UCMFile *ucm, const char *line, UBool forBase, UCMStates *baseStates);
+
+
+U_CAPI UCMTable * U_EXPORT2
+ucm_openTable(void);
+
+U_CAPI void U_EXPORT2
+ucm_closeTable(UCMTable *table);
+
+U_CAPI void U_EXPORT2
+ucm_resetTable(UCMTable *table);
+
+U_CAPI void U_EXPORT2
+ucm_sortTable(UCMTable *t);
+
+/*
+ * Remove mappings with their move flag set from the base table
+ * and move some of them (with UCM_MOVE_TO_EXT) to the extension table.
+ */
+U_CAPI void U_EXPORT2
+ucm_moveMappings(UCMTable *base, UCMTable *ext);
+
+/**
+ * Read a table from a .ucm file, from after the CHARMAP line to
+ * including the END CHARMAP line.
+ */
+U_CAPI void U_EXPORT2
+ucm_readTable(UCMFile *ucm, FileStream* convFile,
+              UBool forBase, UCMStates *baseStates,
+              UErrorCode *pErrorCode);
+
+/**
+ * Check the validity of mappings against a base table's states;
+ * necessary for extension-only tables that were read before their base tables.
+ */
+U_CAPI UBool U_EXPORT2
+ucm_checkValidity(UCMTable *ext, UCMStates *baseStates);
+
+/**
+ * Check a base table against an extension table.
+ * Set the moveTarget!=NULL if it is possible to move mappings from the base.
+ * This is the case where base and extension tables are parsed from a single file
+ * (moveTarget==ext)
+ * or when delta file mappings are subtracted from a base table.
+ *
+ * When a base table cannot be modified because a delta file is parsed in makeconv,
+ * then set moveTarget=NULL.
+ *
+ * if(intersectBase) then mappings that exist in the base table but not in
+ * the extension table are moved to moveTarget instead of showing an error.
+ *
+ * Special mode:
+ * If intersectBase==2 for a DBCS extension table, then SBCS mappings are
+ * not moved out of the base unless their Unicode input requires it.
+ * This helps ucmkbase generate base tables for DBCS-only extension .cnv files.
+ *
+ * For both tables in the same file, the extension table is automatically
+ * built.
+ * For separate files, the extension file can use a complete mapping table (.ucm file),
+ * so that common mappings need not be stripped out manually.
+ *
+ *
+ * Sort both tables, and then for each mapping direction:
+ *
+ * If intersectBase is TRUE and the base table contains a mapping
+ * that does not exist in the extension table, then this mapping is moved
+ * to moveTarget.
+ *
+ * - otherwise -
+ *
+ * If the base table contains a mapping for which the input sequence is
+ * the same as the extension input, then
+ * - if the output is the same: remove the extension mapping
+ * - else: error
+ *
+ * If the base table contains a mapping for which the input sequence is
+ * a prefix of the extension input, then
+ * - if moveTarget!=NULL: move the base mapping to the moveTarget table
+ * - else: error
+ *
+ * @return FALSE in case of an irreparable error
+ */
+U_CAPI UBool U_EXPORT2
+ucm_checkBaseExt(UCMStates *baseStates, UCMTable *base, UCMTable *ext,
+                 UCMTable *moveTarget, UBool intersectBase);
+
+U_CAPI void U_EXPORT2
+ucm_printTable(UCMTable *table, FILE *f, UBool byUnicode);
+
+U_CAPI void U_EXPORT2
+ucm_printMapping(UCMTable *table, UCMapping *m, FILE *f);
+
+
+U_CAPI void U_EXPORT2
+ucm_addState(UCMStates *states, const char *s);
+
+U_CAPI void U_EXPORT2
+ucm_processStates(UCMStates *states, UBool ignoreSISOCheck);
+
+U_CAPI int32_t U_EXPORT2
+ucm_countChars(UCMStates *states,
+               const uint8_t *bytes, int32_t length);
+
+
+U_CAPI int8_t U_EXPORT2
+ucm_parseBytes(uint8_t bytes[UCNV_EXT_MAX_BYTES], const char *line, const char **ps);
+
+U_CAPI UBool U_EXPORT2
+ucm_parseMappingLine(UCMapping *m,
+                     UChar32 codePoints[UCNV_EXT_MAX_UCHARS],
+                     uint8_t bytes[UCNV_EXT_MAX_BYTES],
+                     const char *line);
+
+U_CAPI void U_EXPORT2
+ucm_addMapping(UCMTable *table,
+               UCMapping *m,
+               UChar32 codePoints[UCNV_EXT_MAX_UCHARS],
+               uint8_t bytes[UCNV_EXT_MAX_BYTES]);
+
+/* very makeconv-specific functions ----------------------------------------- */
+
+/* finalize and optimize states after the toUnicode mappings are processed */
+U_CAPI void U_EXPORT2
+ucm_optimizeStates(UCMStates *states,
+                   uint16_t **pUnicodeCodeUnits,
+                   _MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks,
+                   UBool verbose);
+
+/* moved here because it is used inside ucmstate.c */
+U_CAPI int32_t U_EXPORT2
+ucm_findFallback(_MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks,
+                 uint32_t offset);
+
+/* very rptp2ucm-specific functions ----------------------------------------- */
+
+/*
+ * Input: Separate tables with mappings from/to Unicode,
+ * subchar and subchar1 (0 if none).
+ * All mappings must have flag 0.
+ *
+ * Output: fromUTable will contain the union of mappings with the correct
+ * precision flags, and be sorted.
+ */
+U_CAPI void U_EXPORT2
+ucm_mergeTables(UCMTable *fromUTable, UCMTable *toUTable,
+                const uint8_t *subchar, int32_t subcharLength,
+                uint8_t subchar1);
+
+U_CAPI UBool U_EXPORT2
+ucm_separateMappings(UCMFile *ucm, UBool isSISO);
+
+U_CDECL_END
+
+#endif
+
+#endif