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e473cf6caa
My implementation is now compiling and running. I've made a test with the WIN32-MSVC demo.
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
//==============
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// heap_block.c
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//==============
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// Copyright 2024, Sven Bieg (svenbieg@web.de)
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// http://github.com/svenbieg/Heap
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//=======
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// Using
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//=======
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#include "heap_block.h"
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//==================
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// Con-/Destructors
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//==================
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void* heap_block_init(heap_handle_t heap, heap_block_info_t const* info)
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{
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heap_t* heap_ptr=(heap_t*)heap;
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configASSERT(info->size%sizeof(size_t)==0);
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configASSERT(info->offset>=(size_t)heap+sizeof(heap_t));
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configASSERT(info->offset+info->size<=(size_t)heap+heap_ptr->size);
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size_t* head_ptr=(size_t*)info->offset;
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*head_ptr=info->header;
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head_ptr++;
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size_t* foot_ptr=(size_t*)(info->offset+info->size);
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foot_ptr--;
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*foot_ptr=info->header;
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return head_ptr;
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}
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//========
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// Access
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//========
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void heap_block_get_chain(heap_handle_t heap, void* ptr, heap_block_chain_t* info)
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{
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heap_t* heap_ptr=(heap_t*)heap;
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size_t heap_offset=(size_t)heap;
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size_t heap_start=heap_offset+sizeof(heap_t);
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size_t offset=heap_block_get_offset(ptr);
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size_t* head_ptr=(size_t*)offset;
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info->current.offset=offset;
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info->current.header=*head_ptr;
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if(offset>heap_start)
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{
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size_t* foot_ptr=(size_t*)offset;
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foot_ptr--;
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info->previous.header=*foot_ptr;
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info->previous.offset=offset-info->previous.size;
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}
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else
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{
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info->previous.header=0;
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info->previous.offset=0;
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}
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size_t heap_end=heap_offset+heap_ptr->used;
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size_t next_offset=offset+info->current.size;
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if(next_offset<heap_end)
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{
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size_t* head_ptr=(size_t*)next_offset;
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info->next.offset=next_offset;
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info->next.header=*head_ptr;
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}
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else
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{
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info->next.header=0;
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info->next.offset=0;
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}
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}
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void heap_block_get_info(heap_handle_t heap, void* ptr, heap_block_info_t* info)
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{
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heap_t* heap_ptr=(heap_t*)heap;
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info->offset=heap_block_get_offset(ptr);
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configASSERT(info->offset>=(size_t)heap+sizeof(heap_t));
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configASSERT(info->offset<(size_t)heap+heap_ptr->used);
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size_t* head_ptr=(size_t*)info->offset;
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info->header=*head_ptr;
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configASSERT(info->size>=3*sizeof(size_t));
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configASSERT(info->offset+info->size<=(size_t)heap+heap_ptr->used);
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configASSERT(*((size_t*)(info->offset+info->size-sizeof(size_t)))==*head_ptr);
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}
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