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/* Copyright (C) 1997, 1998, 1999 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: gsdsrc.c,v 1.4 2002/02/21 22:24:52 giles Exp $ */
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/* DataSource procedures */
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#include "memory_.h"
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#include "gx.h"
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#include "gsdsrc.h"
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#include "gserrors.h"
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#include "stream.h"
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/* GC descriptor */
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public_st_data_source();
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private
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ENUM_PTRS_WITH(data_source_enum_ptrs, gs_data_source_t *psrc)
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{
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if (psrc->type == data_source_type_string)
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ENUM_RETURN_CONST_STRING_PTR(gs_data_source_t, data.str);
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else if (psrc->type == data_source_type_stream)
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ENUM_RETURN_PTR(gs_data_source_t, data.strm);
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else /* bytes or floats */
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ENUM_RETURN_PTR(gs_data_source_t, data.str.data);
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}
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ENUM_PTRS_END
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private RELOC_PTRS_WITH(data_source_reloc_ptrs, gs_data_source_t *psrc)
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{
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if (psrc->type == data_source_type_string)
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RELOC_CONST_STRING_PTR(gs_data_source_t, data.str);
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else if (psrc->type == data_source_type_stream)
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RELOC_PTR(gs_data_source_t, data.strm);
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else /* bytes or floats */
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RELOC_PTR(gs_data_source_t, data.str.data);
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}
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RELOC_PTRS_END
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/* Access data from a string or a byte object. */
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/* Does *not* check bounds. */
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int
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data_source_access_string(const gs_data_source_t * psrc, ulong start,
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uint length, byte * buf, const byte ** ptr)
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{
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const byte *p = psrc->data.str.data + start;
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if (ptr)
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*ptr = p;
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else
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memcpy(buf, p, length);
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return 0;
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}
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/* access_bytes is identical to access_string, but has a different */
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/* GC procedure. */
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int
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data_source_access_bytes(const gs_data_source_t * psrc, ulong start,
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uint length, byte * buf, const byte ** ptr)
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{
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const byte *p = psrc->data.str.data + start;
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if (ptr)
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*ptr = p;
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else
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memcpy(buf, p, length);
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return 0;
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}
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/* Access data from a stream. */
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/* Returns gs_error_rangecheck if out of bounds. */
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int
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data_source_access_stream(const gs_data_source_t * psrc, ulong start,
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uint length, byte * buf, const byte ** ptr)
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{
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stream *s = psrc->data.strm;
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const byte *p;
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if (start >= s->position &&
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(p = start - s->position + s->cbuf) + length <=
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s->cursor.r.limit + 1
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) {
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if (ptr)
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*ptr = p;
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else
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memcpy(buf, p, length);
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} else {
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uint nread;
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int code = sseek(s, start);
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if (code < 0)
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return_error(gs_error_rangecheck);
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code = sgets(s, buf, length, &nread);
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if (code < 0)
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return_error(gs_error_rangecheck);
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if (nread != length)
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return_error(gs_error_rangecheck);
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if (ptr)
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*ptr = buf;
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}
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return 0;
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}
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