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#include "fitz_base.h"
#include "fitz_stream.h"
fz_error *
fz_newbuffer(fz_buffer **bp, int size)
{
fz_buffer *b;
b = *bp = fz_malloc(sizeof(fz_buffer));
if (!b)
return fz_throw("outofmem: buffer struct");
b->refs = 1;
b->ownsdata = 1;
b->bp = fz_malloc(size);
if (!b->bp)
{
fz_free(b);
return fz_throw("outofmem: buffer memory");
}
b->rp = b->bp;
b->wp = b->bp;
b->ep = b->bp + size;
b->eof = 0;
return fz_okay;
}
fz_error *
fz_newbufferwithmemory(fz_buffer **bp, unsigned char *data, int size)
{
fz_buffer *b;
b = *bp = fz_malloc(sizeof(fz_buffer));
if (!b)
return fz_throw("outofmem: buffer struct");
b->refs = 1;
b->ownsdata = 0;
b->bp = data;
b->rp = b->bp;
b->wp = b->bp + size;
b->ep = b->bp + size;
b->eof = 0;
return fz_okay;
}
fz_buffer *
fz_keepbuffer(fz_buffer *buf)
{
buf->refs ++;
return buf;
}
void
fz_dropbuffer(fz_buffer *buf)
{
if (--buf->refs == 0)
{
if (buf->ownsdata)
fz_free(buf->bp);
fz_free(buf);
}
}
fz_error *
fz_growbuffer(fz_buffer *buf)
{
unsigned char *newbp;
int rp = buf->rp - buf->bp;
int wp = buf->wp - buf->bp;
int ep = buf->ep - buf->bp;
if (!buf->ownsdata)
return fz_throw("assert: grow borrowed memory");
newbp = fz_realloc(buf->bp, ep * 2);
if (!newbp)
return fz_throw("outofmem: resize buffer memory");
buf->bp = newbp;
buf->rp = buf->bp + rp;
buf->wp = buf->bp + wp;
buf->ep = buf->bp + ep * 2;
return fz_okay;
}
fz_error *
fz_rewindbuffer(fz_buffer *buf)
{
if (!buf->ownsdata)
return fz_throw("assert: rewind borrowed memory");
memmove(buf->bp, buf->rp, buf->wp - buf->rp);
buf->wp = buf->bp + (buf->wp - buf->rp);
buf->rp = buf->bp;
return fz_okay;
}
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