[Android] Android adb push是怎样被实现的？

Android adb push是怎样被实现的？

CODE: commandline.c

PATH: <ANDROID_PROJECT>/system/core/adb/commandline.c

FUNC: do_sync_push() @adb_commandline()

LINE: 1147

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do_sync_push() body is at 

@ <ANDROID_PROJECT>/system/core/adb/file_sync_client.c

L 

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int do_sync_push( const char *lpath, const char *rpath, int verifyApk) {     struct stat st;     unsigned mode;     int fd;    fd = adb_connect("sync:");     if(fd < 0) {         fprintf(stderr, "error: %s\n", adb_error());         return 1;     }     if(stat(lpath, &st)) {         fprintf(stderr, "cannot stat '%s': %s\n", lpath, strerror(errno));         sync_quit(fd);         return 1;     }     if(S_ISDIR(st.st_mode)) {         BEGIN();         if(copy_local_dir_remote(fd, lpath, rpath, 0, 0)) {             return 1;         } else {             END();             sync_quit(fd);         }     } else {         if(sync_readmode(fd, rpath, &mode)) {             return 1;         }         if((mode != 0) && S_ISDIR(mode)) {                 /* if we're copying a local file to a remote directory,                 ** we *really* want to copy to remotedir + "/" + localfilename                 */             const char *name = adb_dirstop(lpath);             if(name == 0) {                 name = lpath;             } else {                 name++;             }             int  tmplen = strlen(name) + strlen(rpath) + 2;             char *tmp = malloc(strlen(name) + strlen(rpath) + 2);             if(tmp == 0) return 1;             snprintf(tmp, tmplen, "%s/%s", rpath, name);             rpath = tmp;         }         BEGIN();         if(sync_send(fd, lpath, rpath, st.st_mtime , st.st_mode , verifyApk)) {             return 1;         } else {             END();             sync_quit(fd);             return 0;         }     }     return 0; }

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接着查看sync_send()函数的实现部分

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@ <ANDROID_PROJECT>/system/core/adb/file_sync_client.c

L 297

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static int sync_send (int fd, const char *lpath, const char *rpath,                      unsigned mtime, mode_t mode, int verifyApk) {     syncmsg msg;     int len, r;     syncsendbuf *sbuf = &send_buffer;     char* file_buffer = NULL;     int size = 0;     char tmp[64];     len = strlen(rpath);     if(len > 1024) goto fail;     snprintf(tmp, sizeof(tmp), ",%d", mode);     r = strlen(tmp);     if (verifyApk) {         int lfd;         zipfile_t zip;         zipentry_t entry;         int amt;         // if we are transferring an APK file, then sanity check to make sure         // we have a real zip file that contains an AndroidManifest.xml         // this requires that we read the entire file into memory.         lfd = adb_open(lpath, O_RDONLY);         if(lfd < 0) {             fprintf(stderr, "cannot open '%s': %s\n", lpath, strerror(errno));             return -1;         }         size = adb_lseek(lfd, 0, SEEK_END);         if (size == -1 || -1 == adb_lseek(lfd, 0, SEEK_SET)) {             fprintf(stderr, "error seeking in file '%s'\n" , lpath);             adb_close(lfd);             return 1;         }         file_buffer = ( char *)malloc(size);         if (file_buffer == NULL) {             fprintf(stderr, "could not allocate buffer for '%s'\n" ,                     lpath);             adb_close(lfd);             return 1;         }         amt = adb_read(lfd, file_buffer, size);         if (amt != size) {             fprintf(stderr, "error reading from file: '%s'\n" , lpath);             adb_close(lfd);             free(file_buffer);             return 1;         }         adb_close(lfd);         zip = init_zipfile(file_buffer, size);         if (zip == NULL) {             fprintf(stderr, "file '%s' is not a valid zip file\n",                     lpath);             free(file_buffer);             return 1;         }         entry = lookup_zipentry(zip, "AndroidManifest.xml");         release_zipfile(zip);         if (entry == NULL) {             fprintf(stderr, "file '%s' does not contain AndroidManifest.xml\n" ,                     lpath);             free(file_buffer);             return 1;         }     }     msg.req.id = ID_SEND;     msg.req.namelen = htoll(len + r);     if(writex(fd, &msg.req, sizeof(msg.req)) ||        writex(fd, rpath, len) || writex(fd, tmp, r)) {         free(file_buffer);         goto fail;     }     if (file_buffer) {         write_data_buffer(fd, file_buffer, size, sbuf);         free(file_buffer);     } else if (S_ISREG(mode))         write_data_file(fd, lpath, sbuf); #ifdef HAVE_SYMLINKS     else if (S_ISLNK(mode))         write_data_link(fd, lpath, sbuf); #endif     else         goto fail;     msg.data.id = ID_DONE;     msg.data.size = htoll(mtime);     if(writex(fd, &msg.data, sizeof(msg.data)))         goto fail;     if(readx(fd, &msg.status, sizeof(msg.status)))         return -1;     if(msg.status.id != ID_OKAY) {         if(msg.status.id == ID_FAIL) {             len = ltohl(msg.status.msglen);             if(len > 256) len = 256;             if(readx(fd, sbuf->data , len)) {                 return -1;             }             sbuf-> data[len] = 0;         } else             strcpy(sbuf-> data, "unknown reason");         fprintf(stderr, "failed to copy '%s' to '%s': %s\n" , lpath, rpath, sbuf->data);         return -1;     }     return 0; fail:     fprintf(stderr,"protocol failure\n");     adb_close(fd);     return -1; }