commondecls.h

JPEG压缩和解压程序和一些相关的说明文档 内容比较全

#include <stdio.h>
#include <stddef.h>
#include  <stdlib.h>
#define SIZEOF(object)  ((size_t) sizeof(object))
typedef unsigned char JSAMPLE;
typedef JSAMPLE  *JSAMPROW;  /* ptr to one image row of pixel samples. */
typedef JSAMPROW *JSAMPARRAY;   /* ptr to some rows (a 2-D sample array) */
typedef long INT32;
/* Datatype used for image dimensions.  The JPEG standard only supports

 * images up to 64K*64K due to 16-bit fields in SOF markers.  Therefore

 * "unsigned int" is sufficient on all machines.  However, if you need to

 * handle larger images and you don't mind deviating from the spec, you

 * can change this datatype.

 */
typedef unsigned int JDIMENSION; /*usigned int is 32 bits*/
typedef unsigned char UINT8;

/* UINT16 must hold at least the values 0..65535. */

typedef unsigned short UINT16;