384 lines
8.2 KiB
C
384 lines
8.2 KiB
C
/**
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* libpsd - Photoshop file formats (*.psd) decode library
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* Copyright (C) 2004-2007 Graphest Software.
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*
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* libpsd is the legal property of its developers, whose names are too numerous
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* to list here. Please refer to the COPYRIGHT file distributed with this
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* source distribution.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: stream.c, created by Patrick in 2006.05.18, libpsd@graphest.com Exp $
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*/
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#include "libpsd.h"
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#include "psd_system.h"
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#include "psd_stream.h"
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#include "psd_color.h"
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#include <stdio.h>
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static
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#ifdef __GNUC__
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__inline
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#else
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#ifdef __cplusplus
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inline
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#endif
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#endif
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psd_bool psd_test_big_endian(void)
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{
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static psd_bool result = 2;
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const psd_int byte_order[1] = { 1 };
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if (result == 2)
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{
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if(((char *)byte_order)[0] == 1)
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result = psd_false;
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else
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result = psd_true;
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}
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return result;
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}
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psd_int psd_stream_get(psd_context * context, psd_uchar * buffer, psd_int length)
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{
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psd_stream * stream;
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psd_int left, read = 0;
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if(buffer == NULL)
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return 0;
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psd_assert(length >= 0);
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stream = &context->stream;
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if(stream->buffer == NULL)
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{
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stream->buffer = (psd_uchar *)psd_malloc(PSD_STREAM_MAX_READ_LENGTH);
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if(stream->buffer == NULL)
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return 0;
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}
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left = stream->read_in_length - stream->read_out_length;
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if(left > 0 && left <= length)
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{
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memcpy(buffer, stream->buffer + stream->read_out_length, left);
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buffer += left;
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length -= left;
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stream->read_out_length = stream->read_in_length;
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read += left;
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}
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if(length > PSD_STREAM_MAX_READ_LENGTH)
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{
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read += psd_fread(context->file, buffer, 1, length);
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stream->read_out_length = stream->read_in_length;
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}
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else if(stream->read_out_length == stream->read_in_length)
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{
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if(length > 0)
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{
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stream->read_in_length = psd_fread(context->file, stream->buffer, 1, PSD_STREAM_MAX_READ_LENGTH);
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if(length > stream->read_in_length)
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length = stream->read_in_length;
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memcpy(buffer, stream->buffer, length);
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read += length;
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stream->read_out_length = length;
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}
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}
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else
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{
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left = stream->read_in_length - stream->read_out_length;
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if(length > left)
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length = left;
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memcpy(buffer, stream->buffer + stream->read_out_length, length);
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stream->read_out_length += length;
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read += length;
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}
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stream->current_pos += read;
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return read;
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}
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psd_int psd_stream_get_null(psd_context * context, psd_int length)
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{
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psd_stream * stream;
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psd_int left, read = 0;
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psd_assert(length >= 0);
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if(length <= 0)
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return 0;
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stream = &context->stream;
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if(stream->buffer == NULL)
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{
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stream->buffer = (psd_uchar *)psd_malloc(PSD_STREAM_MAX_READ_LENGTH);
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if(stream->buffer == NULL)
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return 0;
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}
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left = stream->read_in_length - stream->read_out_length;
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if(left > 0 && left <= length)
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{
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length -= left;
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stream->read_out_length = stream->read_in_length;
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read += left;
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}
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if(length > PSD_STREAM_MAX_READ_LENGTH)
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{
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psd_fseek(context->file, length, SEEK_CUR);
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read += length;
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stream->read_out_length = stream->read_in_length;
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}
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else if(stream->read_out_length == stream->read_in_length)
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{
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if(length > 0)
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{
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stream->read_in_length = psd_fread(context->file, stream->buffer, 1, PSD_STREAM_MAX_READ_LENGTH);
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if(length > stream->read_in_length)
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length = stream->read_in_length;
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read += length;
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stream->read_out_length = length;
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}
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}
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else
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{
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left = stream->read_in_length - stream->read_out_length;
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if(length > left)
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length = left;
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stream->read_out_length += length;
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read += length;
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}
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stream->current_pos += read;
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return read;
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}
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psd_bool psd_stream_get_bool(psd_context * context)
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{
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return psd_stream_get_char(context) > 0 ? psd_true : psd_false;
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}
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psd_uchar psd_stream_get_char(psd_context * context)
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{
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psd_uchar str[4];
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psd_uchar value = 0;
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if(psd_stream_get(context, str, 1) == 1)
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value = str[0];
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return value;
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}
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psd_short psd_stream_get_short(psd_context * context)
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{
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psd_uchar str[4];
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psd_short value = 0;
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if(psd_stream_get(context, str, 2) == 2)
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value = PSD_CHAR_TO_SHORT(str);
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return value;
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}
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psd_int psd_stream_get_int(psd_context * context)
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{
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psd_uchar str[4];
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psd_int value = 0;
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if(psd_stream_get(context, str, 4) == 4)
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value = PSD_CHAR_TO_INT(str);
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return value;
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}
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psd_float psd_stream_get_float(psd_context * context)
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{
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psd_uchar str[4], *dst;
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psd_float value = 0.0;
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psd_int i;
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if(psd_stream_get(context, str, 4) == 4)
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{
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if (psd_test_big_endian() == psd_true)
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{
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memcpy(&value, str, 4);
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}
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else
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{
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dst = (psd_uchar *)&value;
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for(i = 0; i < 4; i ++)
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{
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*dst++ = str[3 - i];
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}
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}
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}
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return value;
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}
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psd_double psd_stream_get_double(psd_context * context)
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{
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psd_uchar str[8], *dst;
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psd_double value = 0.0;
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psd_int i;
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if(psd_stream_get(context, str, 8) == 8)
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{
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if (psd_test_big_endian() == psd_true)
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{
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memcpy(&value, str, 8);
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}
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else
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{
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dst = (psd_uchar *)&value;
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for(i = 0; i < 8; i ++)
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{
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*dst++ = str[7 - i];
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}
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}
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}
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return value;
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}
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psd_argb_color psd_stream_get_space_color(psd_context * context)
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{
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psd_color_space color_space; // 2 bytes for color space
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psd_ushort color_component[4]; // 4 * 2 byte color component
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psd_int i;
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psd_argb_color color;
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// Color: 2 bytes for space followed by 4 * 2 byte color component
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color_space = psd_stream_get_short(context);
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for(i = 0; i < 4; i ++)
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color_component[i] = psd_stream_get_short(context) >> 8;
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if(psd_color_space_to_argb(&color, color_space, color_component) != psd_status_done)
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return psd_color_clear;
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return color;
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}
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psd_blend_mode psd_stream_get_blend_mode(psd_context * context)
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{
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psd_uint tag;
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psd_blend_mode blend_mode = psd_blend_mode_normal;
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tag = psd_stream_get_int(context);
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switch(tag)
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{
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case 'norm':
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blend_mode = psd_blend_mode_normal;
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break;
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case 'dark':
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blend_mode = psd_blend_mode_darken;
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break;
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case 'lite':
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blend_mode = psd_blend_mode_lighten;
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break;
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case 'hue ':
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blend_mode = psd_blend_mode_hue;
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break;
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case 'sat ':
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blend_mode = psd_blend_mode_saturation;
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break;
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case 'colr':
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blend_mode = psd_blend_mode_color;
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break;
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case 'lum ':
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blend_mode = psd_blend_mode_luminosity;
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break;
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case 'mul ':
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blend_mode = psd_blend_mode_multiply;
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break;
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case 'scrn':
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blend_mode = psd_blend_mode_screen;
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break;
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case 'diss':
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blend_mode = psd_blend_mode_dissolve;
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break;
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case 'over':
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blend_mode = psd_blend_mode_overlay;
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break;
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case 'hLit':
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blend_mode = psd_blend_mode_hard_light;
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break;
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case 'sLit':
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blend_mode = psd_blend_mode_soft_light;
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break;
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case 'diff':
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blend_mode = psd_blend_mode_difference;
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break;
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case 'smud':
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blend_mode = psd_blend_mode_exclusion;
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break;
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case 'div ':
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blend_mode = psd_blend_mode_color_dodge;
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break;
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case 'idiv':
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blend_mode = psd_blend_mode_color_burn;
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break;
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case 'lbrn':
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blend_mode = psd_blend_mode_linear_burn;
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break;
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case 'lddg':
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blend_mode = psd_blend_mode_linear_dodge;
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break;
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case 'vLit':
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blend_mode = psd_blend_mode_vivid_light;
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break;
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case 'lLit':
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blend_mode = psd_blend_mode_linear_light;
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break;
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case 'pLit':
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blend_mode = psd_blend_mode_pin_light;
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break;
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case 'hMix':
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blend_mode = psd_blend_mode_hard_mix;
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break;
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case 'pass':
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blend_mode = psd_blend_mode_pass_through;
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break;
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default:
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psd_assert(0);
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break;
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}
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return blend_mode;
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}
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void psd_stream_free(psd_context * context)
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{
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if (context->stream.buffer != NULL)
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{
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psd_free(context->stream.buffer);
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context->stream.buffer = NULL;
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context->stream.read_out_length = context->stream.read_in_length = 0;
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}
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/* [DP] the application is responsible for this
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if (context->file != NULL)
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{
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psd_fclose(context->file);
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context->file = NULL;
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}
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*/
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}
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