268 lines
7.8 KiB
C++
268 lines
7.8 KiB
C++
/*
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* Copyright © 2017,2018 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_VECTOR_HH
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#define HB_VECTOR_HH
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#include "hb.hh"
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#include "hb-array.hh"
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template <typename Type, unsigned int PreallocedCount=8>
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struct hb_vector_t
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{
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typedef Type ItemType;
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enum { item_size = hb_static_size (Type) };
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HB_NO_COPY_ASSIGN_TEMPLATE2 (hb_vector_t, Type, PreallocedCount);
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hb_vector_t () { init (); }
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~hb_vector_t () { fini (); }
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unsigned int len;
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private:
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unsigned int allocated; /* == 0 means allocation failed. */
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Type *arrayZ_;
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Type static_array[PreallocedCount];
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public:
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void init ()
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{
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len = 0;
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allocated = ARRAY_LENGTH (static_array);
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arrayZ_ = nullptr;
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}
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void fini ()
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{
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if (arrayZ_)
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free (arrayZ_);
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arrayZ_ = nullptr;
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allocated = len = 0;
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}
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void fini_deep ()
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{
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Type *array = arrayZ();
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unsigned int count = len;
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for (unsigned int i = 0; i < count; i++)
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array[i].fini ();
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fini ();
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}
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Type * arrayZ () { return arrayZ_ ? arrayZ_ : static_array; }
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const Type * arrayZ () const { return arrayZ_ ? arrayZ_ : static_array; }
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Type& operator [] (int i_)
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{
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unsigned int i = (unsigned int) i_;
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if (unlikely (i >= len))
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return Crap (Type);
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return arrayZ()[i];
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}
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const Type& operator [] (int i_) const
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{
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unsigned int i = (unsigned int) i_;
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if (unlikely (i >= len))
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return Null(Type);
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return arrayZ()[i];
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}
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hb_array_t<Type> as_array ()
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{ return hb_array (arrayZ(), len); }
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hb_array_t<const Type> as_array () const
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{ return hb_array (arrayZ(), len); }
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hb_array_t<const Type> sub_array (unsigned int start_offset, unsigned int count) const
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{ return as_array ().sub_array (start_offset, count);}
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hb_array_t<const Type> sub_array (unsigned int start_offset, unsigned int *count = nullptr /* IN/OUT */) const
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{ return as_array ().sub_array (start_offset, count);}
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hb_array_t<Type> sub_array (unsigned int start_offset, unsigned int count)
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{ return as_array ().sub_array (start_offset, count);}
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hb_array_t<Type> sub_array (unsigned int start_offset, unsigned int *count = nullptr /* IN/OUT */)
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{ return as_array ().sub_array (start_offset, count);}
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hb_sorted_array_t<Type> as_sorted_array ()
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{ return hb_sorted_array (arrayZ(), len); }
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hb_sorted_array_t<const Type> as_sorted_array () const
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{ return hb_sorted_array (arrayZ(), len); }
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hb_array_t<const Type> sorted_sub_array (unsigned int start_offset, unsigned int count) const
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{ return as_sorted_array ().sorted_sub_array (start_offset, count);}
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hb_array_t<const Type> sorted_sub_array (unsigned int start_offset, unsigned int *count = nullptr /* IN/OUT */) const
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{ return as_sorted_array ().sorted_sub_array (start_offset, count);}
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hb_array_t<Type> sorted_sub_array (unsigned int start_offset, unsigned int count)
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{ return as_sorted_array ().sorted_sub_array (start_offset, count);}
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hb_array_t<Type> sorted_sub_array (unsigned int start_offset, unsigned int *count = nullptr /* IN/OUT */)
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{ return as_sorted_array ().sorted_sub_array (start_offset, count);}
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template <typename T> explicit_operator T * () { return arrayZ(); }
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template <typename T> explicit_operator const T * () const { return arrayZ(); }
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operator hb_array_t<Type> () { return as_array (); }
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operator hb_array_t<const Type> () const { return as_array (); }
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Type * operator + (unsigned int i) { return arrayZ() + i; }
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const Type * operator + (unsigned int i) const { return arrayZ() + i; }
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Type *push ()
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{
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if (unlikely (!resize (len + 1)))
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return &Crap(Type);
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return &arrayZ()[len - 1];
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}
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Type *push (const Type& v)
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{
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Type *p = push ();
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*p = v;
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return p;
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}
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bool in_error () const { return allocated == 0; }
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/* Allocate for size but don't adjust len. */
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bool alloc (unsigned int size)
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{
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if (unlikely (!allocated))
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return false;
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if (likely (size <= allocated))
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return true;
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/* Reallocate */
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unsigned int new_allocated = allocated;
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while (size >= new_allocated)
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new_allocated += (new_allocated >> 1) + 8;
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Type *new_array = nullptr;
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if (!arrayZ_)
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{
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new_array = (Type *) calloc (new_allocated, sizeof (Type));
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if (new_array)
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memcpy (new_array, static_array, len * sizeof (Type));
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}
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else
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{
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bool overflows = (new_allocated < allocated) || hb_unsigned_mul_overflows (new_allocated, sizeof (Type));
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if (likely (!overflows))
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new_array = (Type *) realloc (arrayZ_, new_allocated * sizeof (Type));
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}
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if (unlikely (!new_array))
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{
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allocated = 0;
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return false;
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}
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arrayZ_ = new_array;
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allocated = new_allocated;
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return true;
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}
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bool resize (int size_)
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{
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unsigned int size = size_ < 0 ? 0u : (unsigned int) size_;
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if (!alloc (size))
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return false;
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if (size > len)
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memset (arrayZ() + len, 0, (size - len) * sizeof (*arrayZ()));
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len = size;
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return true;
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}
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void pop ()
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{
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if (!len) return;
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len--;
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}
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void remove (unsigned int i)
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{
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if (unlikely (i >= len))
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return;
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Type *array = arrayZ();
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memmove (static_cast<void *> (&array[i]),
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static_cast<void *> (&array[i + 1]),
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(len - i - 1) * sizeof (Type));
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len--;
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}
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void shrink (int size_)
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{
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unsigned int size = size_ < 0 ? 0u : (unsigned int) size_;
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if (size < len)
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len = size;
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}
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template <typename T>
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Type *find (T v)
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{
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Type *array = arrayZ();
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for (unsigned int i = 0; i < len; i++)
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if (array[i] == v)
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return &array[i];
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return nullptr;
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}
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template <typename T>
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const Type *find (T v) const
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{
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const Type *array = arrayZ();
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for (unsigned int i = 0; i < len; i++)
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if (array[i] == v)
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return &array[i];
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return nullptr;
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}
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void qsort (int (*cmp)(const void*, const void*))
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{ as_array ().qsort (cmp); }
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void qsort (unsigned int start = 0, unsigned int end = (unsigned int) -1)
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{ as_array ().qsort (start, end); }
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template <typename T>
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Type *lsearch (const T &x, Type *not_found = nullptr)
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{ return as_array ().lsearch (x, not_found); }
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template <typename T>
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const Type *lsearch (const T &x, const Type *not_found = nullptr) const
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{ return as_array ().lsearch (x, not_found); }
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template <typename T>
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Type *bsearch (const T &x, Type *not_found = nullptr)
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{ return as_sorted_array ().bsearch (x, not_found); }
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template <typename T>
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const Type *bsearch (const T &x, const Type *not_found = nullptr) const
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{ return as_sorted_array ().bsearch (x, not_found); }
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template <typename T>
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bool bfind (const T &x, unsigned int *i = nullptr,
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hb_bfind_not_found_t not_found = HB_BFIND_NOT_FOUND_DONT_STORE,
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unsigned int to_store = (unsigned int) -1) const
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{ return as_sorted_array ().bfind (x, i, not_found, to_store); }
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};
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#endif /* HB_VECTOR_HH */
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