harfbuzz/src/hb-vector.hh

261 lines
7.6 KiB
C++

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