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authorTao Bao <tbao@google.com>2015-07-14 03:00:26 +0200
committerGerrit Code Review <noreply-gerritcodereview@google.com>2015-07-14 03:00:27 +0200
commit0bacbfd03c866b9078f86216e6786da91238ac91 (patch)
tree47a62ed3cf643578280ddb1982599ed8345dd071 /applypatch/main.cpp
parentMerge "Revert "Zero blocks before BLKDISCARD"" (diff)
parentrecovery: Switch applypatch/ and updater/ to cpp. (diff)
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Diffstat (limited to 'applypatch/main.cpp')
-rw-r--r--applypatch/main.cpp213
1 files changed, 213 insertions, 0 deletions
diff --git a/applypatch/main.cpp b/applypatch/main.cpp
new file mode 100644
index 000000000..63ff5c2c0
--- /dev/null
+++ b/applypatch/main.cpp
@@ -0,0 +1,213 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "applypatch.h"
+#include "edify/expr.h"
+#include "mincrypt/sha.h"
+
+static int CheckMode(int argc, char** argv) {
+ if (argc < 3) {
+ return 2;
+ }
+ return applypatch_check(argv[2], argc-3, argv+3);
+}
+
+static int SpaceMode(int argc, char** argv) {
+ if (argc != 3) {
+ return 2;
+ }
+ char* endptr;
+ size_t bytes = strtol(argv[2], &endptr, 10);
+ if (bytes == 0 && endptr == argv[2]) {
+ printf("can't parse \"%s\" as byte count\n\n", argv[2]);
+ return 1;
+ }
+ return CacheSizeCheck(bytes);
+}
+
+// Parse arguments (which should be of the form "<sha1>" or
+// "<sha1>:<filename>" into the new parallel arrays *sha1s and
+// *patches (loading file contents into the patches). Returns true on
+// success.
+static bool ParsePatchArgs(int argc, char** argv,
+ char*** sha1s, Value*** patches, int* num_patches) {
+ *num_patches = argc;
+ *sha1s = reinterpret_cast<char**>(malloc(*num_patches * sizeof(char*)));
+ *patches = reinterpret_cast<Value**>(malloc(*num_patches * sizeof(Value*)));
+ memset(*patches, 0, *num_patches * sizeof(Value*));
+
+ uint8_t digest[SHA_DIGEST_SIZE];
+
+ for (int i = 0; i < *num_patches; ++i) {
+ char* colon = strchr(argv[i], ':');
+ if (colon != NULL) {
+ *colon = '\0';
+ ++colon;
+ }
+
+ if (ParseSha1(argv[i], digest) != 0) {
+ printf("failed to parse sha1 \"%s\"\n", argv[i]);
+ return false;
+ }
+
+ (*sha1s)[i] = argv[i];
+ if (colon == NULL) {
+ (*patches)[i] = NULL;
+ } else {
+ FileContents fc;
+ if (LoadFileContents(colon, &fc) != 0) {
+ goto abort;
+ }
+ (*patches)[i] = reinterpret_cast<Value*>(malloc(sizeof(Value)));
+ (*patches)[i]->type = VAL_BLOB;
+ (*patches)[i]->size = fc.size;
+ (*patches)[i]->data = reinterpret_cast<char*>(fc.data);
+ }
+ }
+
+ return true;
+
+ abort:
+ for (int i = 0; i < *num_patches; ++i) {
+ Value* p = (*patches)[i];
+ if (p != NULL) {
+ free(p->data);
+ free(p);
+ }
+ }
+ free(*sha1s);
+ free(*patches);
+ return false;
+}
+
+int PatchMode(int argc, char** argv) {
+ Value* bonus = NULL;
+ if (argc >= 3 && strcmp(argv[1], "-b") == 0) {
+ FileContents fc;
+ if (LoadFileContents(argv[2], &fc) != 0) {
+ printf("failed to load bonus file %s\n", argv[2]);
+ return 1;
+ }
+ bonus = reinterpret_cast<Value*>(malloc(sizeof(Value)));
+ bonus->type = VAL_BLOB;
+ bonus->size = fc.size;
+ bonus->data = (char*)fc.data;
+ argc -= 2;
+ argv += 2;
+ }
+
+ if (argc < 6) {
+ return 2;
+ }
+
+ char* endptr;
+ size_t target_size = strtol(argv[4], &endptr, 10);
+ if (target_size == 0 && endptr == argv[4]) {
+ printf("can't parse \"%s\" as byte count\n\n", argv[4]);
+ return 1;
+ }
+
+ char** sha1s;
+ Value** patches;
+ int num_patches;
+ if (!ParsePatchArgs(argc-5, argv+5, &sha1s, &patches, &num_patches)) {
+ printf("failed to parse patch args\n");
+ return 1;
+ }
+
+ int result = applypatch(argv[1], argv[2], argv[3], target_size,
+ num_patches, sha1s, patches, bonus);
+
+ int i;
+ for (i = 0; i < num_patches; ++i) {
+ Value* p = patches[i];
+ if (p != NULL) {
+ free(p->data);
+ free(p);
+ }
+ }
+ if (bonus) {
+ free(bonus->data);
+ free(bonus);
+ }
+ free(sha1s);
+ free(patches);
+
+ return result;
+}
+
+// This program applies binary patches to files in a way that is safe
+// (the original file is not touched until we have the desired
+// replacement for it) and idempotent (it's okay to run this program
+// multiple times).
+//
+// - if the sha1 hash of <tgt-file> is <tgt-sha1>, does nothing and exits
+// successfully.
+//
+// - otherwise, if the sha1 hash of <src-file> is <src-sha1>, applies the
+// bsdiff <patch> to <src-file> to produce a new file (the type of patch
+// is automatically detected from the file header). If that new
+// file has sha1 hash <tgt-sha1>, moves it to replace <tgt-file>, and
+// exits successfully. Note that if <src-file> and <tgt-file> are
+// not the same, <src-file> is NOT deleted on success. <tgt-file>
+// may be the string "-" to mean "the same as src-file".
+//
+// - otherwise, or if any error is encountered, exits with non-zero
+// status.
+//
+// <src-file> (or <file> in check mode) may refer to an MTD partition
+// to read the source data. See the comments for the
+// LoadMTDContents() function above for the format of such a filename.
+
+int main(int argc, char** argv) {
+ if (argc < 2) {
+ usage:
+ printf(
+ "usage: %s [-b <bonus-file>] <src-file> <tgt-file> <tgt-sha1> <tgt-size> "
+ "[<src-sha1>:<patch> ...]\n"
+ " or %s -c <file> [<sha1> ...]\n"
+ " or %s -s <bytes>\n"
+ " or %s -l\n"
+ "\n"
+ "Filenames may be of the form\n"
+ " MTD:<partition>:<len_1>:<sha1_1>:<len_2>:<sha1_2>:...\n"
+ "to specify reading from or writing to an MTD partition.\n\n",
+ argv[0], argv[0], argv[0], argv[0]);
+ return 2;
+ }
+
+ int result;
+
+ if (strncmp(argv[1], "-l", 3) == 0) {
+ result = ShowLicenses();
+ } else if (strncmp(argv[1], "-c", 3) == 0) {
+ result = CheckMode(argc, argv);
+ } else if (strncmp(argv[1], "-s", 3) == 0) {
+ result = SpaceMode(argc, argv);
+ } else {
+ result = PatchMode(argc, argv);
+ }
+
+ if (result == 2) {
+ goto usage;
+ }
+ return result;
+}