mc-str-encode-string-sets-private.h
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	/*
	* Copyright 2024-present MongoDB, 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 MONGOCRYPT_STR_ENCODE_STRING_SETS_PRIVATE_H
	#define MONGOCRYPT_STR_ENCODE_STRING_SETS_PRIVATE_H

	#include "mongocrypt-buffer-private.h"
	#include "mongocrypt.h"

	// Represents a valid unicode string with the bad character 0xFF appended to the end. This is our base string which
	// we build substring trees on. Stores all the valid code points in the string, plus one code point for 0xFF.
	// Exposed for testing.
	typedef struct {
	_mongocrypt_buffer_t buf;
	uint32_t *codepoint_offsets;
	uint32_t codepoint_len;
	} mc_utf8_string_with_bad_char_t;

	// Initialize by copying buffer into data and adding the bad character.
	mc_utf8_string_with_bad_char_t mc_utf8_string_with_bad_char_from_buffer(const char buf, uint32_t len);

	void mc_utf8_string_with_bad_char_destroy(mc_utf8_string_with_bad_char_t *utf8);

	// Set of affixes of a shared base string. Does not do any duplicate prevention.
	typedef struct _mc_affix_set_t mc_affix_set_t;

	// Initialize affix set from base string and number of entries (this must be known as a prior).
	mc_affix_set_t mc_affix_set_new(const mc_utf8_string_with_bad_char_t base_string, uint32_t n_indices);

	void mc_affix_set_destroy(mc_affix_set_t *set);

	// Insert affix into set. base_start/end_idx are codepoint indices. base_end_idx is exclusive. Returns true if
	// inserted, false otherwise.
	bool mc_affix_set_insert(mc_affix_set_t *set, uint32_t base_start_idx, uint32_t base_end_idx);

	// Insert the base string count times into the set. Treated as a special case, since this is the only affix that
	// will appear multiple times. Returns true if inserted, false otherwise.
	bool mc_affix_set_insert_base_string(mc_affix_set_t *set, uint32_t count);

	// Iterator on affix set.
	typedef struct {
	mc_affix_set_t *set;
	uint32_t cur_idx;
	} mc_affix_set_iter_t;

	// Point the iterator to the first affix of the given set.
	void mc_affix_set_iter_init(mc_affix_set_iter_t it, mc_affix_set_t set);

	// Get the next affix, its length in bytes, and its count. Returns false if the set does not have a next element, true
	// otherwise.
	bool mc_affix_set_iter_next(mc_affix_set_iter_t it, const char str, uint32_t byte_len, uint32_t *count);

	// Set of substrings of a shared base string. Prevents duplicates.
	typedef struct _mc_substring_set_t mc_substring_set_t;

	mc_substring_set_t mc_substring_set_new(const mc_utf8_string_with_bad_char_t base_string);

	void mc_substring_set_destroy(mc_substring_set_t *set);

	// Insert the base string count times into the set. Treated as a special case, since this is the only substring that
	// will appear multiple times. Always inserts successfully.
	void mc_substring_set_increment_fake_string(mc_substring_set_t *set, uint32_t count);

	// Insert substring into set. base_start/end_idx are codepoint indices. base_end_idx is exclusive. Returns true if
	// inserted, false otherwise.
	bool mc_substring_set_insert(mc_substring_set_t *set, uint32_t base_start_idx, uint32_t base_end_idx);

	// Iterator on substring set.
	typedef struct {
	mc_substring_set_t *set;
	void *cur_node;
	uint32_t cur_idx;
	} mc_substring_set_iter_t;

	// Point the iterator to the first substring of the given set.
	void mc_substring_set_iter_init(mc_substring_set_iter_t it, mc_substring_set_t set);

	// Get the next substring, its length in bytes, and its count. Returns false if the set does not have a next element,
	// true otherwise.
	bool mc_substring_set_iter_next(mc_substring_set_iter_t it, const char str, uint32_t byte_len, uint32_t *count);

	#endif

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