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#include "pfc.h"
void grow_buf::makespace(int new_size)
{
if (!ptr || !size)
{
size = 1;
while(size<new_size)
{
if (size == (1 << 31))
{
return;
}
size<<=1;
}
ptr = malloc(size);
}
else
{
if (size<new_size)
{
do
{
if (size == (1 << 31))
{
free(ptr);
ptr=0;
return;
}
size<<=1;
}
while (size<new_size);
ptr = realloc(ptr,size);
}
}
}
void * grow_buf::finish()
{
void * rv=0;
if (ptr)
{
rv = realloc(ptr,used);
ptr = 0;
size = 0;
used = 0;
}
return rv;
}
void grow_buf::reset()
{
if (ptr) {free(ptr);ptr=0;}
used=0;
size=0;
}
static void foo_memcpy(void * dst,const void * src,size_t bytes)
{
if (src) memcpy(dst,src,bytes);
else memset(dst,0,bytes);
}
bool grow_buf::write(const void * data, size_t bytes)
{
makespace(used+bytes);
if (!ptr)
return false;
foo_memcpy((char*)ptr+used,data,bytes);
used+=bytes;
return true;
}
void grow_buf::write_ptr(const void * data, int bytes,int offset)
{
if (offset+bytes>used) {used = offset;write(data,bytes);}
else foo_memcpy((char*)ptr+offset,data,bytes);
}
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