jpeg2eps.c

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

/*
 * jpeg2eps.c
 * Copyright (C) 2000-2002 A.J. van Os; Released under GPL
 *
 * Description:
 * Functions to translate jpeg pictures into eps
 *
 */

#include <stdio.h>
#include "antiword.h"

#if defined(DEBUG)
static int	iPicCounter = 0;
#endif /* DEBUG */


#if defined(DEBUG)
/*
 * vCopy2File
 */
static void
vCopy2File(FILE *pFile, ULONG ulFileOffset, size_t tPictureLen)
{
	FILE	*pOutFile;
	size_t	tIndex;
	int	iTmp;
	char	szFilename[30];

	if (!bSetDataOffset(pFile, ulFileOffset)) {
		return;
	}

	sprintf(szFilename, "/tmp/pic/pic%04d.jpg", ++iPicCounter);
	pOutFile = fopen(szFilename, "wb");
	if (pOutFile == NULL) {
		return;
	}
	for (tIndex = 0; tIndex < tPictureLen; tIndex++) {
		iTmp = iNextByte(pFile);
		if (putc(iTmp, pOutFile) == EOF) {
			break;
		}
	}
	(void)fclose(pOutFile);
} /* end of vCopy2File */
#endif /* DEBUG */

/*
 * bTranslateJPEG - translate a JPEG picture
 *
 * This function translates a picture from jpeg to eps
 *
 * return TRUE when sucessful, otherwise FALSE
 */
BOOL
bTranslateJPEG(diagram_type *pDiag, FILE *pFile,
	ULONG ulFileOffset, size_t tPictureLen, const imagedata_type *pImg)
{
#if defined(DEBUG)
	vCopy2File(pFile, ulFileOffset, tPictureLen);
#endif /* DEBUG */

	/* Seek to start position of JPEG data */
	if (!bSetDataOffset(pFile, ulFileOffset)) {
		return FALSE;
	}

	vImagePrologue(pDiag, pImg);
	vASCII85EncodeFile(pFile, pDiag->pOutFile, tPictureLen);
	vImageEpilogue(pDiag);

	return TRUE;
} /* end of bTranslateJPEG */