#include?“../include/jpg.h“
#include?

bool?is_jpg（char?*file）
{
	//?判斷file是否存在
	assert（file）;
	
	//?判斷file?是否為.jpg
	
	char?*tmp?=?strstr（file??“.jpg“）;
	if（tmp?==?NULL）{
		return?false;
	}
	if（tmp?!=?NULL?&&?strlen（tmp）?>?strlen（“.jpg“））{
		return?false;
	}
	
	return?true;
}

char?*img_decoding（char?*file?struct?image_info?*img_info?）
{
	//?獲取圖片文件信息存在file_info?里面
	struct?stat?file_info;
	bzero（&file_info?sizeof（file_info））;
	stat（file?&file_info）;
	
	//?申請(qǐng)一塊圖片大小的內(nèi)存?存放圖片數(shù)據(jù)并清零
	char?*jpg_buf?=?calloc（1file_info.st_size）;
	if（jpg_buf?==?NULL）
	{
		printf（“calloc?error?[line:%d]?%s?\n“?__LINE__strerror（errno））;
		exit（0）;
	}
	
	//?將圖片數(shù)據(jù)?全部讀入?jpg_buf?里
	FILE?*fp?=?fopen（file“r“）;
	if（fp?==?NULL）
	{
		printf（“fopen?error?[line:%d]?%s?\n“?__LINE__strerror（errno））;
		exit（0）;
	}
	
	while（1）
	{	
		if（fread（jpg_buffile_info.st_size5fp）?		{
			if（feof（fp））
			{
				break;
			}
			if（ferror（fp））
			{
				printf（“fread?error?[line:%d]?%s?\n“?__LINE__strerror（errno））;
				break;
			}
		}
		fread（jpg_buffile_info.st_size5fp）;
	}
	
	//?聲明解壓縮結(jié)構(gòu)體，以及錯(cuò)誤管理結(jié)構(gòu)體
	struct?jpeg_decompress_struct?cinfo;
	struct?jpeg_error_mgr?jerr;

	//?使用缺省的出錯(cuò)處理來初始化解壓縮結(jié)構(gòu)體
	cinfo.err?=?jpeg_std_error（&jerr）;
	jpeg_create_decompress（&cinfo）;

	//?配置該cinfo，使其從jpgdata中讀取jpg_size個(gè)字節(jié)
	//?這些數(shù)據(jù)必須是完整的JPEG數(shù)據(jù)
	jpeg_mem_src（&cinfo?jpg_buf?file_info.st_size）;


	//?讀取JPEG文件的頭，并判斷其格式是否合法
	int?ret?=?jpeg_read_header（&cinfo?true）;
	if（ret?!=?1）
	{
		fprintf（stderr?“[%d]:?jpeg_read_header?failed:?“
			“%s\n“?__LINE__?strerror（errno））;
		exit（0）;
	}

	//?開始解壓
	jpeg_start_decompress（&cinfo）;

	img_info->width?=?cinfo.output_width;
	img_info->height?=?cinfo.output_height;
	img_info->pixel_size?=?cinfo.output_components;

	int?row_stride?=?img_info->width?*?img_info->pixel_size;

	//?根據(jù)圖片的尺寸大小，分配一塊相應(yīng)的內(nèi)存rgb_buffer
	//?用來存放從jpgdata解壓出來的圖像數(shù)據(jù)
	unsigned?long?rgb_size;
	unsigned?char?*rgb_buffer;
	rgb_size?=?img_info->width?*?img_info->height?*?img_info->pixel_size;
	rgb_buffer?=?（unsigned?char?*）calloc（1?rgb_size）;

	//?循環(huán)地將圖片的每一行讀出并解壓到rgb_buffer中
	int?line?=?0;
	while（cinfo.output_scanline?	{
		unsigned?char?*buffer_array[1];
		buffer_array[0]?=?rgb_buffer?+?（cinfo.output_scanline）?*?row_stride;
		jpeg_read_scanlines（&cinfo?buffer_array?1）;
	}

	//?解壓完了，將jpeg相關(guān)的資源釋放掉
?	jpeg_finish_decompress（&cinfo）;
	jpeg_destroy_decompress（&cinfo）;
	free（jpg_buf）;
	fclose（fp）;
	
	return?rgb_buffer;
}

//?將圖片顯示到顯存的指定位置上。
void?display（char?*file?
		??char?*fbmem?
		??struct?fb_var_screeninfo?*lcd_info???//?lcd?信息
		??int?x_offset???//?x?方向偏移量
		??int?y_offset）??//?y?方向偏移量
{
	//bzero（fbmem??lcd_info->xres?*?lcd_info->yres?*?lcd_info->?bits_per_pixel/8）;
	struct?image_info?*img_info?=?calloc（1sizeof（struct?image_info））;
	char?*rgb_buf?=?img_decoding（fileimg_info）;
	char?*tmp?=?rgb_buf;
	/*if（x_offset?==?0?&&?y_offset?==?0?&&?img_info

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件????1152056??2018-05-11?00:08??2project\bmp\background.bmp

?????文件?????112856??2018-05-11?00:08??2project\bmp\bar.bmp

?????文件??????18964??2018-06-16?19:52??2project\bmp\BMPfileFormat.png

?????文件??????54936??2018-05-11?00:08??2project\bmp\key_off.bmp

?????文件??????54936??2018-05-11?00:08??2project\bmp\key_on.bmp

?????文件??????67902??2018-12-27?13:01??2project\bmp\logo.bmp

?????文件???????4496??2018-12-27?15:08??2project\include\jpg.c

?????文件????????966??2018-12-09?17:35??2project\include\jpg.h

?????文件??????13366??2018-12-27?11:28??2project\jpg\background.jpg

?????文件???????5222??2018-12-27?11:29??2project\jpg\bar.jpg

?????文件???????2634??2018-12-27?11:29??2project\jpg\key_off.jpg

?????文件???????2614??2018-12-27?11:29??2project\jpg\key_on.jpg

?????文件???????8174??2018-12-27?11:30??2project\jpg\logo.jpg

?????文件??????21316??2018-05-11?00:08??2project\mp3\d1.mp3

?????文件??????19644??2018-05-11?00:08??2project\mp3\d10.mp3

?????文件??????19226??2018-05-11?00:08??2project\mp3\d11.mp3

?????文件??????18808??2018-05-11?00:08??2project\mp3\d12.mp3

?????文件??????20898??2018-05-11?00:08??2project\mp3\d2.mp3

?????文件??????20898??2018-05-11?00:08??2project\mp3\d3.mp3

?????文件??????20898??2018-05-11?00:08??2project\mp3\d4.mp3

?????文件??????20898??2018-05-11?00:08??2project\mp3\d5.mp3

?????文件??????20898??2018-05-11?00:08??2project\mp3\d6.mp3

?????文件??????21316??2018-05-11?00:08??2project\mp3\d7.mp3

?????文件??????20062??2018-05-11?00:08??2project\mp3\d8.mp3

?????文件??????20062??2018-05-11?00:08??2project\mp3\d9.mp3

?????文件?????998772??2018-12-27?20:22??2project\mp3\eeeee.bmp

?????文件??????12495??2018-12-28?17:02??2project\src\show_jpeg

?????文件???????7186??2018-12-28?17:02??2project\src\show_jpeg.c

?????目錄??????????0??2018-12-27?11:30??2project\bmp

?????目錄??????????0??2018-12-27?15:08??2project\include

............此處省略7個(gè)文件信息