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https://gitlab.uni-freiburg.de/opensourcevdi/spice-common
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5ebeee5114
In addition to Laszlo's commit fixing rhbz#928973, we can add some compile-time assertion to lz_common.h to help catch similar bugs in the future. This uses gnulib's verify.h to make sure at compile-time that the various constant arrays used in lz_common.h are of the expected size. I've checked that before Laszlo's patch, the assert triggers, and that it's gone after it.
74 lines
2.4 KiB
C
74 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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#define LZ_MAGIC (*(uint32_t *)"LZ ")
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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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