do verification and extraction on memory, not files

Changes minzip and recovery's file signature verification to work on
memory regions, rather than files.

For packages which are regular files, install.cpp now mmap()s them
into memory and then passes the mapped memory to the verifier and to
the minzip library.

Support for files which are raw block maps (which will be used when we
have packages written to encrypted data partitions) is present but
largely untested so far.

Bug: 12188746
Change-Id: I12cc3e809834745a489dd9d4ceb558cbccdc3f71

1 files changed, 11 insertions, 4 deletions

diff --git a/updater/updater.c b/updater/updater.c
index c7009fe..4e1cc9c 100644
--- a/updater/updater.c
+++ b/updater/updater.c
@@ -22,6 +22,7 @@
 #include "updater.h"
 #include "install.h"
 #include "minzip/Zip.h"
+#include "minzip/SysUtil.h"
 
 // Generated by the makefile, this function defines the
 // RegisterDeviceExtensions() function, which calls all the
@@ -65,19 +66,24 @@ int main(int argc, char** argv) {
 
     // Extract the script from the package.
 
-    char* package_data = argv[3];
+    const char* package_filename = argv[3];
+    MemMapping map;
+    if (sysMapFile(package_filename, &map) != 0) {
+        printf("failed to map package %s\n", argv[3]);
+        return 3;
+    }
     ZipArchive za;
     int err;
-    err = mzOpenZipArchive(package_data, &za);
+    err = mzOpenZipArchive(map.addr, map.length, &za);
     if (err != 0) {
         printf("failed to open package %s: %s\n",
-                package_data, strerror(err));
+               argv[3], strerror(err));
         return 3;
     }
 
     const ZipEntry* script_entry = mzFindZipEntry(&za, SCRIPT_NAME);
     if (script_entry == NULL) {
-        printf("failed to find %s in %s\n", SCRIPT_NAME, package_data);
+        printf("failed to find %s in %s\n", SCRIPT_NAME, package_filename);
         return 4;
     }
 
@@ -152,6 +158,7 @@ int main(int argc, char** argv) {
     if (updater_info.package_zip) {
         mzCloseZipArchive(updater_info.package_zip);
     }
+    sysReleaseMap(&map);
     free(script);
 
     return 0;