哪位大佬知道update.img的头部信息如何修改

gyjk

1. //解析固件，获得固件头部信息
   
2. int analyticImage(const char *filepath, PRKIMAGE_HDR phdr) {
   
3.     long long ulFwSize;
   
4.     STRUCT_RKIMAGE_HEAD rkimage_head;
   
5.     unsigned char m_md5[32];
   
6. 
   
7. 
   
8.     int fd = open(filepath, O_RDONLY);
   
9.     if (fd < 0) {
   
10.         LOGE("Can't open %s\n", filepath);
    
11.         return -2;
    
12.     }
    
13. 
    
14.     //1. image 头部信息读取
    
15.     if (read(fd, &rkimage_head, sizeof(STRUCT_RKIMAGE_HEAD)) != sizeof(STRUCT_RKIMAGE_HEAD)) {
    
16.         LOGE("Can't read %s\n(%s)\n", filepath, strerror(errno));
    
17.         close(fd);
    
18.         return -2;
    
19.     }
    
20. 
    
21.    [color=Red] if ((rkimage_head.reserved[14]=='H')&&(rkimage_head.reserved[15]=='I'))[/color] {
    
22.         ulFwSize = *((DWORD *)(&rkimage_head.reserved[16]));
    
23.         ulFwSize <<= 32;
    
24.         ulFwSize += rkimage_head.dwFWOffset;
    
25.         ulFwSize += rkimage_head.dwFWSize;
    
26.     } else {
    
27.         ulFwSize = rkimage_head.dwFWOffset + rkimage_head.dwFWSize;
    
28.     }
    
29.     rkimage_head.dwFWSize = ulFwSize - rkimage_head.dwFWOffset;
    
30.     display_head(&rkimage_head);
    
31. 
    
32.     //2. 固件md5 校验
    
33.     long long fileSize;
    
34.     int nMd5DataSize;
    
35. 
    
36.     fileSize = lseek64(fd, 0L, SEEK_END);
    
37.     nMd5DataSize = fileSize - ulFwSize;
    
38.     if (nMd5DataSize >= 160) {
    
39.         LOGE("md5 : not support sign image.\n");
    
40.         //sign image
    
41.         //m_bSignFlag = true;
    
42.         //m_signMd5Size = nMd5DataSize-32;
    
43.         //fseeko64(m_pFile,ulFwSize,SEEK_SET);
    
44.         //fread(m_md5,1,32,m_pFile);
    
45.         //fread(m_signMd5,1,nMd5DataSize-32,m_pFile);
    
46.     } else {
    
47.         lseek64(fd, -32, SEEK_END);
    
48.         if ( read(fd, m_md5, 32) != 32) {
    
49.             LOGE("lseek failed.\n");
    
50.             return -2;
    
51.         }
    
52.     }
    
53. 
    
54.     //3. image 地址信息读取
    
55.     if (lseek64(fd, rkimage_head.dwFWOffset, SEEK_SET) == -1) {
    
56.         LOGE("lseek failed.\n");
    
57.         return -2;
    
58.     }
    
59. 
    
60.     if (read(fd, phdr, sizeof(RKIMAGE_HDR)) != sizeof(RKIMAGE_HDR)) {
    
61.         LOGE("Can't read %s\n(%s)\n", filepath, strerror(errno));
    
62.         close(fd);
    
63.         return -2;
    
64.     }
    
65. 
    
66.     if (phdr->tag != RKIMAGE_TAG) {
    
67.         LOGE("tag: %x\n", phdr->tag);
    
68.         LOGE("Invalid image\n");
    
69.         return -3;
    
70.     }
    
71. 
    
72.     if (rkimage_head.dwFWOffset) {
    
73.         adjustFileOffset(phdr, rkimage_head.dwFWOffset, rkimage_head.dwBootOffset, rkimage_head.dwBootSize);
    
74.     }
    
75. 
    
76.     display_hdr(phdr);
    
77. 
    
78.     close(fd);
    
79.     #if 1
    
80.     if (!compareMd5sum((char*)filepath, m_md5, 0, fileSize-32)) {
    
81.         LOGE("Md5Check update.img fwSize:%ld", fileSize-32);
    
82.         return -1;
    
83.     }
    
84.     #endif
    
85.     LOGI("analyticImage ok.\n");
    
86.     return 0;
    
87. }

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