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https://gitlab.uni-freiburg.de/opensourcevdi/spice-common
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5a7e5876e6
Commitd39dfbfechanges lz magic to be always treated as LE when encoded. Runtime conversion from a string to uint32 is storing the magic with the same endianness on both LE and BE machines. This requires aditional byte swap when sending magic between LE/BE machines. Changing lz magic to a constant will ensure, that it will be always stored in native endianness, and the second byte swap won't be needed. This commit revertsd39dfbfechanges in lz.c while keeping the rest. They will be needed in future commit for quic.c
75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/*
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Copyright (C) 2009 Red Hat, Inc.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*common header for encoder and decoder*/
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#ifndef _LZ_COMMON_H
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#define _LZ_COMMON_H
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#include <spice/macros.h>
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#include "verify.h"
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SPICE_BEGIN_DECLS
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//#define DEBUG
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/* change the max window size will require change in the encoding format*/
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#define LZ_MAX_WINDOW_SIZE (1 << 25)
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#define MAX_COPY 32
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typedef enum {
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LZ_IMAGE_TYPE_INVALID,
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LZ_IMAGE_TYPE_PLT1_LE,
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LZ_IMAGE_TYPE_PLT1_BE, // PLT stands for palette
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LZ_IMAGE_TYPE_PLT4_LE,
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LZ_IMAGE_TYPE_PLT4_BE,
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LZ_IMAGE_TYPE_PLT8,
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LZ_IMAGE_TYPE_RGB16,
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LZ_IMAGE_TYPE_RGB24,
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LZ_IMAGE_TYPE_RGB32,
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LZ_IMAGE_TYPE_RGBA,
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LZ_IMAGE_TYPE_XXXA,
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LZ_IMAGE_TYPE_A8
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} LzImageType;
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#define LZ_IMAGE_TYPE_MASK 0x0f
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#define LZ_IMAGE_TYPE_LOG 4 // number of bits required for coding the image type
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/* access to the arrays is based on the image types */
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static const int IS_IMAGE_TYPE_PLT[] = {0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0};
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static const int IS_IMAGE_TYPE_RGB[] = {0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1};
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static const int PLT_PIXELS_PER_BYTE[] = {0, 8, 8, 2, 2, 1};
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static const int RGB_BYTES_PER_PIXEL[] = {0, 1, 1, 1, 1, 1, 2, 3, 4, 4, 4, 1};
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verify(SPICE_N_ELEMENTS(IS_IMAGE_TYPE_PLT) == (LZ_IMAGE_TYPE_A8 + 1));
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verify(SPICE_N_ELEMENTS(IS_IMAGE_TYPE_RGB) == (LZ_IMAGE_TYPE_A8 + 1));
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verify(SPICE_N_ELEMENTS(PLT_PIXELS_PER_BYTE) == (LZ_IMAGE_TYPE_PLT8 + 1));
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verify(SPICE_N_ELEMENTS(RGB_BYTES_PER_PIXEL) == (LZ_IMAGE_TYPE_A8 + 1));
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/* ASCII "LZ " */
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#define LZ_MAGIC 0x20205a4c
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#define LZ_VERSION_MAJOR 1U
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#define LZ_VERSION_MINOR 1U
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#define LZ_VERSION ((LZ_VERSION_MAJOR << 16) | (LZ_VERSION_MINOR & 0xffff))
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SPICE_END_DECLS
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#endif // _LZ_COMMON_H
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