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/* Copyright (C) 1997, 1998, 1999 Aladdin Enterprises. All rights reserved.
This software is provided AS-IS with no warranty, either express or
implied.
This software is distributed under license and may not be copied,
modified or distributed except as expressly authorized under the terms
of the license contained in the file LICENSE in this distribution.
For more information about licensing, please refer to
http://www.ghostscript.com/licensing/. For information on
commercial licensing, go to http://www.artifex.com/licensing/ or
contact Artifex Software, Inc., 101 Lucas Valley Road #110,
San Rafael, CA 94903, U.S.A., +1(415)492-9861.
*/
/* $Id$ */
/* DataSource procedures */
#include "memory_.h"
#include "gx.h"
#include "gsdsrc.h"
#include "gserrors.h"
#include "stream.h"
/* GC descriptor */
public_st_data_source();
private
ENUM_PTRS_WITH(data_source_enum_ptrs, gs_data_source_t *psrc)
{
if (psrc->type == data_source_type_string)
ENUM_RETURN_CONST_STRING_PTR(gs_data_source_t, data.str);
else if (psrc->type == data_source_type_stream)
ENUM_RETURN_PTR(gs_data_source_t, data.strm);
else /* bytes or floats */
ENUM_RETURN_PTR(gs_data_source_t, data.str.data);
}
ENUM_PTRS_END
private RELOC_PTRS_WITH(data_source_reloc_ptrs, gs_data_source_t *psrc)
{
if (psrc->type == data_source_type_string)
RELOC_CONST_STRING_PTR(gs_data_source_t, data.str);
else if (psrc->type == data_source_type_stream)
RELOC_PTR(gs_data_source_t, data.strm);
else /* bytes or floats */
RELOC_PTR(gs_data_source_t, data.str.data);
}
RELOC_PTRS_END
/* Access data from a string or a byte object. */
/* Does *not* check bounds. */
int
data_source_access_string(const gs_data_source_t * psrc, ulong start,
uint length, byte * buf, const byte ** ptr)
{
const byte *p = psrc->data.str.data + start;
if (ptr)
*ptr = p;
else
memcpy(buf, p, length);
return 0;
}
/* access_bytes is identical to access_string, but has a different */
/* GC procedure. */
int
data_source_access_bytes(const gs_data_source_t * psrc, ulong start,
uint length, byte * buf, const byte ** ptr)
{
const byte *p = psrc->data.str.data + start;
if (ptr)
*ptr = p;
else
memcpy(buf, p, length);
return 0;
}
/* Access data from a stream. */
/* Returns gs_error_rangecheck if out of bounds. */
int
data_source_access_stream(const gs_data_source_t * psrc, ulong start,
uint length, byte * buf, const byte ** ptr)
{
stream *s = psrc->data.strm;
const byte *p;
if (start >= s->position &&
(p = start - s->position + s->cbuf) + length <=
s->cursor.r.limit + 1
) {
if (ptr)
*ptr = p;
else
memcpy(buf, p, length);
} else {
uint nread;
int code = sseek(s, start);
if (code < 0)
return_error(gs_error_rangecheck);
code = sgets(s, buf, length, &nread);
if (code < 0)
return_error(gs_error_rangecheck);
if (nread != length)
return_error(gs_error_rangecheck);
if (ptr)
*ptr = buf;
}
return 0;
}
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