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89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
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* JPEG.h
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*
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* Copyright (c) 2017-present, MacPaw Inc. All rights reserved.
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*
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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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*
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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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*
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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,
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* MA 02110-1301 USA
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*/
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#ifndef __WINZIP_JPEG_JPEG_H__
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#define __WINZIP_JPEG_JPEG_H__
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#define WinZipJPEGMetadataFoundStartOfScan 1
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#define WinZipJPEGMetadataFoundEndOfImage 2
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#define WinZipJPEGMetadataParsingFailed 3
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typedef struct WinZipJPEGBlock
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{
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int16_t c[64];
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uint8_t eob;
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} WinZipJPEGBlock;
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typedef struct WinZipJPEGQuantizationTable
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{
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int16_t c[64];
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} WinZipJPEGQuantizationTable;
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typedef struct WinZipJPEGHuffmanCode
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{
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unsigned int code,length;
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} WinZipJPEGHuffmanCode;
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typedef struct WinZipJPEGHuffmanTable
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{
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WinZipJPEGHuffmanCode codes[256];
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} WinZipJPEGHuffmanTable;
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typedef struct WinZipJPEGComponent
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{
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unsigned int identifier;
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unsigned int horizontalfactor,verticalfactor;
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WinZipJPEGQuantizationTable *quantizationtable;
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} WinZipJPEGComponent;
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typedef struct WinZipJPEGScanComponent
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{
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WinZipJPEGComponent *component;
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WinZipJPEGHuffmanTable *dctable,*actable;
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} WinZipJPEGScanComponent;
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typedef struct WinZipJPEGMetadata
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{
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unsigned int width,height,bits;
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unsigned int restartinterval;
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unsigned int maxhorizontalfactor,maxverticalfactor;
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unsigned int horizontalmcus,verticalmcus;
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unsigned int numcomponents;
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WinZipJPEGComponent components[4];
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unsigned int numscancomponents;
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WinZipJPEGScanComponent scancomponents[4];
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WinZipJPEGQuantizationTable quantizationtables[4];
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WinZipJPEGHuffmanTable huffmantables[2][4];
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} WinZipJPEGMetadata;
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const void *FindStartOfWinZipJPEGImage(const void *bytes,size_t length);
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void InitializeWinZipJPEGMetadata(WinZipJPEGMetadata *self);
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int ParseWinZipJPEGMetadata(WinZipJPEGMetadata *self,const void *bytes,size_t length);
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#endif
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