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#include <stdio.h> M?Tb9c?`
#include <stdlib.h> 7T9m@
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#include <sys/mman.h> C']TO/2q
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#include <sys/types.h> 'd 4I/
#include <sys/stat.h> KWbnSL8
#include <fcntl.h> |1wfLJ4--l
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#include <sys/ioctl.h> P&"8R
#include <linux/types.h> b<>GF-`w
#include <string.h> _^;+_6&[
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typedef struct /**** BMP file header structure ****/ "S)2<tV
{ a3D''Ra
unsigned int bfSize; /* Size of file */ ]=\vl>W
unsigned short bfReserved1; /* Reserved */ GSo&$T;B6
unsigned short bfReserved2; /* ... */ jN
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unsigned int bfOffBits; /* Offset to bitmap data */ G<n(\85X
} MyBITMAPFILEHEADER; HYm
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typedef struct /**** BMP file info structure ****/ *FhD%><
{ xuBXOr4"P
unsigned int biSize; /* Size of info header */ V6l~Aj}/
int biWidth; /* Width of image */ GP=i6I6C
int biHeight; /* Height of image */ l{q$[/J~)
unsigned short biPlanes; /* Number of color planes */ v`&
unsigned short biBitCount; /* Number of bits per pixel */ [MLJs-*
unsigned int biCompression; /* Type of compression to use */ #m>Rt~(,S
unsigned int biSizeImage; /* Size of image data */ ;VM',40
int biXPelsPerMeter; /* X pixels per meter */ 4HXqRFUD
int biYPelsPerMeter; /* Y pixels per meter */ 70pt5O3]
unsigned int biClrUsed; /* Number of colors used */ ~q0g7?}&
unsigned int biClrImportant; /* Number of important colors */ Xc)V;1
} MyBITMAPINFOHEADER; BCnf'0q
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typedef unsigned char BYTE; MtE18m"z
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typedef struct tagRGBQUAD{ ^Ej4^d
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BYTE rgbBlue;//蓝色的亮度(值范围为0-255) QG{).|pm
BYTE rgbGreen;//绿色的亮度(值范围为0-255) Hgu:*iYA
BYTE rgbRed;//红色的亮度(值范围为0-255) -^A=U7
BYTE rgbReserved;//保留,必须为0 <(|No3jx
}RGBQUAD; /rMxl(wD'
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void SaveBmp(const char *filename,unsigned char *rgbbuf,int width,int height) W40GW
{ 7\ .Ax
MyBITMAPFILEHEADER bfh; D+$ k
MyBITMAPINFOHEADER bih; agQ5%t#
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/* Magic number for file. It does not fit in the header structure due to alignment requirements, so put it outside */ Ub1?dk
unsigned short bfType=0x4d42; &uLxAw
bfh.bfReserved1 = 0; ,.#
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bfh.bfReserved2 = 0; XBJ9"G5
bfh.bfSize = 2+sizeof(MyBITMAPFILEHEADER) + sizeof(MyBITMAPINFOHEADER)+width*height*3; B_f0-nKP
bfh.bfOffBits = 0x36; qg7]
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bih.biSize = sizeof(MyBITMAPINFOHEADER); {HgW9N(
bih.biWidth = width; |.bp
bih.biHeight = height; G5^gwG+
bih.biPlanes = 1; "|1MJuY_6
bih.biBitCount = 24; eiLtZQ
bih.biCompression = 0; V<} ^n
bih.biSizeImage = 0; $Cu/!GA4.>
bih.biXPelsPerMeter = 5000; Sr7+DCr
bih.biYPelsPerMeter = 5000; [V#"7O vl
bih.biClrUsed = 0; OtopA)
bih.biClrImportant = 0; 9JF*xXd>Q
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FILE *file = fopen(filename, "wb"); TO\%F}m(
if (!file) a
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printf("Could not write file\n"); b0a'Y"oef4
return; `1%SXP1
} {Y5h*BD>
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/*Write headers*/ (vIrXF5Dnj
fwrite(&bfType,sizeof(bfType),1,file); 'e6W$?z
fwrite(&bfh,sizeof(bfh),1, file); `Tzqvnn
fwrite(&bih,sizeof(bih),1, file); "?j|;p@!>
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fwrite(rgbbuf,width*height*3,1,file); .?SClTqg
fclose(file); 7YRDQjg
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} SwQ.tK1p
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int main() ~H0~5v F
{ 3&*0n^g
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unsigned char *buffer; C#r_qn
int length,imagesize; sF;1)7]Pq
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int fd,width,height; i7~oZ)w
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fd = open("k1.bmp", O_RDONLY); 4qda!%
if (fd == -1) { |PN-,f{ -
printf("Unable to open file '\n"); >Z^7=5K"O
return; 'OGOT0(
} EpGe'S
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imagesize = lseek(fd, 0, SEEK_END); wrG*1+r
printf("imgsize=%d \n",imagesize); ,|I\{J #C
lseek(fd, 0, SEEK_SET); }jU{RR%6B
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buffer = malloc(imagesize); Y tGH>0}h
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if (buffer == NULL) { jn\\,n"6
printf("Unable to allocate memory for MJPEG image\n"); RA[` Cp"
return; !W$3p'8Tu
} ?p5RSt
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read(fd,buffer, imagesize); tBBN62^X
close(fd); {yyg=AMz
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SaveBmp("test.bmp", buffer+0x36 ,640, 360); <O$'3_S"D
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return 0; 6X|KKsPzX
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} |[34<tIN
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linux 下编译命令: +G/~v`Bv
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gcc bmp.c -o bmp Tjs-+$P+
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运行: A94VSUDA:
./bmp (运行前先将 k1.bmp copy到运行目录下, 运行后可发现有test.bmp 文件生成 ) #UND'c(5
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