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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "../../include/fxcrt/fx_basic.h"
#ifdef __cplusplus
extern "C" {
#endif
void* FXMEM_DefaultAlloc(size_t byte_size, int flags)
{
return (void*)malloc(byte_size);
}
void* FXMEM_DefaultRealloc(void* pointer, size_t new_size, int flags)
{
return realloc(pointer, new_size);
}
void FXMEM_DefaultFree(void* pointer, int flags)
{
free(pointer);
}
#ifdef __cplusplus
}
#endif
CFX_GrowOnlyPool::CFX_GrowOnlyPool(size_t trunk_size)
{
m_TrunkSize = trunk_size;
m_pFirstTrunk = NULL;
}
CFX_GrowOnlyPool::~CFX_GrowOnlyPool()
{
FreeAll();
}
struct _FX_GrowOnlyTrunk {
size_t m_Size;
size_t m_Allocated;
_FX_GrowOnlyTrunk* m_pNext;
};
void CFX_GrowOnlyPool::FreeAll()
{
_FX_GrowOnlyTrunk* pTrunk = (_FX_GrowOnlyTrunk*)m_pFirstTrunk;
while (pTrunk) {
_FX_GrowOnlyTrunk* pNext = pTrunk->m_pNext;
FX_Free(pTrunk);
pTrunk = pNext;
}
m_pFirstTrunk = NULL;
}
void* CFX_GrowOnlyPool::Alloc(size_t size)
{
size = (size + 3) / 4 * 4;
_FX_GrowOnlyTrunk* pTrunk = (_FX_GrowOnlyTrunk*)m_pFirstTrunk;
while (pTrunk) {
if (pTrunk->m_Size - pTrunk->m_Allocated >= size) {
void* p = (FX_LPBYTE)(pTrunk + 1) + pTrunk->m_Allocated;
pTrunk->m_Allocated += size;
return p;
}
pTrunk = pTrunk->m_pNext;
}
size_t alloc_size = size > m_TrunkSize ? size : m_TrunkSize;
pTrunk = (_FX_GrowOnlyTrunk*)FX_Alloc(FX_BYTE, sizeof(_FX_GrowOnlyTrunk) + alloc_size);
pTrunk->m_Size = alloc_size;
pTrunk->m_Allocated = size;
pTrunk->m_pNext = (_FX_GrowOnlyTrunk*)m_pFirstTrunk;
m_pFirstTrunk = pTrunk;
return pTrunk + 1;
}
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