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-rw-r--r--applypatch/applypatch.cpp136
1 files changed, 53 insertions, 83 deletions
diff --git a/applypatch/applypatch.cpp b/applypatch/applypatch.cpp
index 96bd88e88..026863330 100644
--- a/applypatch/applypatch.cpp
+++ b/applypatch/applypatch.cpp
@@ -25,6 +25,8 @@
#include <sys/types.h>
#include <unistd.h>
+#include <base/strings.h>
+
#include "mincrypt/sha.h"
#include "applypatch.h"
#include "mtdutils/mtdutils.h"
@@ -42,7 +44,7 @@ static int GenerateTarget(FileContents* source_file,
size_t target_size,
const Value* bonus_data);
-static int mtd_partitions_scanned = 0;
+static bool mtd_partitions_scanned = false;
// Read a file into memory; store the file contents and associated
// metadata in *file.
@@ -87,21 +89,6 @@ int LoadFileContents(const char* filename, FileContents* file) {
return 0;
}
-static size_t* size_array;
-// comparison function for qsort()ing an int array of indexes into
-// size_array[].
-static int compare_size_indices(const void* a, const void* b) {
- const int aa = *reinterpret_cast<const int*>(a);
- const int bb = *reinterpret_cast<const int*>(b);
- if (size_array[aa] < size_array[bb]) {
- return -1;
- } else if (size_array[aa] > size_array[bb]) {
- return 1;
- } else {
- return 0;
- }
-}
-
// Load the contents of an MTD or EMMC partition into the provided
// FileContents. filename should be a string of the form
// "MTD:<partition_name>:<size_1>:<sha1_1>:<size_2>:<sha1_2>:..." (or
@@ -120,53 +107,45 @@ static int compare_size_indices(const void* a, const void* b) {
enum PartitionType { MTD, EMMC };
static int LoadPartitionContents(const char* filename, FileContents* file) {
- char* copy = strdup(filename);
- const char* magic = strtok(copy, ":");
+ std::string copy(filename);
+ std::vector<std::string> pieces = android::base::Split(copy, ":");
+ if (pieces.size() < 4 || pieces.size() % 2 != 0) {
+ printf("LoadPartitionContents called with bad filename (%s)\n", filename);
+ return -1;
+ }
enum PartitionType type;
-
- if (strcmp(magic, "MTD") == 0) {
+ if (pieces[0] == "MTD") {
type = MTD;
- } else if (strcmp(magic, "EMMC") == 0) {
+ } else if (pieces[0] == "EMMC") {
type = EMMC;
} else {
printf("LoadPartitionContents called with bad filename (%s)\n", filename);
return -1;
}
- const char* partition = strtok(NULL, ":");
+ const char* partition = pieces[1].c_str();
- int i;
- int colons = 0;
- for (i = 0; filename[i] != '\0'; ++i) {
- if (filename[i] == ':') {
- ++colons;
- }
- }
- if (colons < 3 || colons%2 == 0) {
- printf("LoadPartitionContents called with bad filename (%s)\n",
- filename);
- }
-
- int pairs = (colons-1)/2; // # of (size,sha1) pairs in filename
- int* index = reinterpret_cast<int*>(malloc(pairs * sizeof(int)));
- size_t* size = reinterpret_cast<size_t*>(malloc(pairs * sizeof(size_t)));
- char** sha1sum = reinterpret_cast<char**>(malloc(pairs * sizeof(char*)));
+ size_t pairs = (pieces.size() - 2) / 2; // # of (size, sha1) pairs in filename
+ std::vector<size_t> index(pairs);
+ std::vector<size_t> size(pairs);
+ std::vector<std::string> sha1sum(pairs);
- for (i = 0; i < pairs; ++i) {
- const char* size_str = strtok(NULL, ":");
- size[i] = strtol(size_str, NULL, 10);
+ for (size_t i = 0; i < pairs; ++i) {
+ size[i] = strtol(pieces[i*2+2].c_str(), NULL, 10);
if (size[i] == 0) {
printf("LoadPartitionContents called with bad size (%s)\n", filename);
return -1;
}
- sha1sum[i] = strtok(NULL, ":");
+ sha1sum[i] = pieces[i*2+3].c_str();
index[i] = i;
}
- // sort the index[] array so it indexes the pairs in order of
- // increasing size.
- size_array = size;
- qsort(index, pairs, sizeof(int), compare_size_indices);
+ // Sort the index[] array so it indexes the pairs in order of increasing size.
+ sort(index.begin(), index.end(),
+ [&](const size_t& i, const size_t& j) {
+ return (size[i] < size[j]);
+ }
+ );
MtdReadContext* ctx = NULL;
FILE* dev = NULL;
@@ -175,20 +154,18 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
case MTD: {
if (!mtd_partitions_scanned) {
mtd_scan_partitions();
- mtd_partitions_scanned = 1;
+ mtd_partitions_scanned = true;
}
const MtdPartition* mtd = mtd_find_partition_by_name(partition);
if (mtd == NULL) {
- printf("mtd partition \"%s\" not found (loading %s)\n",
- partition, filename);
+ printf("mtd partition \"%s\" not found (loading %s)\n", partition, filename);
return -1;
}
ctx = mtd_read_partition(mtd);
if (ctx == NULL) {
- printf("failed to initialize read of mtd partition \"%s\"\n",
- partition);
+ printf("failed to initialize read of mtd partition \"%s\"\n", partition);
return -1;
}
break;
@@ -197,8 +174,7 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
case EMMC:
dev = fopen(partition, "rb");
if (dev == NULL) {
- printf("failed to open emmc partition \"%s\": %s\n",
- partition, strerror(errno));
+ printf("failed to open emmc partition \"%s\": %s\n", partition, strerror(errno));
return -1;
}
}
@@ -207,15 +183,15 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
SHA_init(&sha_ctx);
uint8_t parsed_sha[SHA_DIGEST_SIZE];
- // allocate enough memory to hold the largest size.
+ // Allocate enough memory to hold the largest size.
file->data = reinterpret_cast<unsigned char*>(malloc(size[index[pairs-1]]));
char* p = (char*)file->data;
file->size = 0; // # bytes read so far
+ bool found = false;
- for (i = 0; i < pairs; ++i) {
- // Read enough additional bytes to get us up to the next size
- // (again, we're trying the possibilities in order of increasing
- // size).
+ for (size_t i = 0; i < pairs; ++i) {
+ // Read enough additional bytes to get us up to the next size. (Again,
+ // we're trying the possibilities in order of increasing size).
size_t next = size[index[i]] - file->size;
size_t read = 0;
if (next > 0) {
@@ -245,8 +221,8 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
memcpy(&temp_ctx, &sha_ctx, sizeof(SHA_CTX));
const uint8_t* sha_so_far = SHA_final(&temp_ctx);
- if (ParseSha1(sha1sum[index[i]], parsed_sha) != 0) {
- printf("failed to parse sha1 %s in %s\n", sha1sum[index[i]], filename);
+ if (ParseSha1(sha1sum[index[i]].c_str(), parsed_sha) != 0) {
+ printf("failed to parse sha1 %s in %s\n", sha1sum[index[i]].c_str(), filename);
free(file->data);
file->data = NULL;
return -1;
@@ -256,7 +232,8 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
// we have a match. stop reading the partition; we'll return
// the data we've read so far.
printf("partition read matched size %zu sha %s\n",
- size[index[i]], sha1sum[index[i]]);
+ size[index[i]], sha1sum[index[i]].c_str());
+ found = true;
break;
}
@@ -274,9 +251,8 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
}
- if (i == pairs) {
- // Ran off the end of the list of (size,sha1) pairs without
- // finding a match.
+ if (!found) {
+ // Ran off the end of the list of (size,sha1) pairs without finding a match.
printf("contents of partition \"%s\" didn't match %s\n", partition, filename);
free(file->data);
file->data = NULL;
@@ -293,11 +269,6 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
file->st.st_uid = 0;
file->st.st_gid = 0;
- free(copy);
- free(index);
- free(size);
- free(sha1sum);
-
return 0;
}
@@ -340,33 +311,33 @@ int SaveFileContents(const char* filename, const FileContents* file) {
}
// Write a memory buffer to 'target' partition, a string of the form
-// "MTD:<partition>[:...]" or "EMMC:<partition_device>:". Return 0 on
+// "MTD:<partition>[:...]" or "EMMC:<partition_device>". Return 0 on
// success.
int WriteToPartition(unsigned char* data, size_t len, const char* target) {
- char* copy = strdup(target);
- const char* magic = strtok(copy, ":");
+ std::string copy(target);
+ std::vector<std::string> pieces = android::base::Split(copy, ":");
+
+ if (pieces.size() != 2) {
+ printf("WriteToPartition called with bad target (%s)\n", target);
+ return -1;
+ }
enum PartitionType type;
- if (strcmp(magic, "MTD") == 0) {
+ if (pieces[0] == "MTD") {
type = MTD;
- } else if (strcmp(magic, "EMMC") == 0) {
+ } else if (pieces[0] == "EMMC") {
type = EMMC;
} else {
printf("WriteToPartition called with bad target (%s)\n", target);
return -1;
}
- const char* partition = strtok(NULL, ":");
-
- if (partition == NULL) {
- printf("bad partition target name \"%s\"\n", target);
- return -1;
- }
+ const char* partition = pieces[1].c_str();
switch (type) {
case MTD: {
if (!mtd_partitions_scanned) {
mtd_scan_partitions();
- mtd_partitions_scanned = 1;
+ mtd_partitions_scanned = true;
}
const MtdPartition* mtd = mtd_find_partition_by_name(partition);
@@ -410,7 +381,7 @@ int WriteToPartition(unsigned char* data, size_t len, const char* target) {
return -1;
}
- for (int attempt = 0; attempt < 2; ++attempt) {
+ for (size_t attempt = 0; attempt < 2; ++attempt) {
if (TEMP_FAILURE_RETRY(lseek(fd, start, SEEK_SET)) == -1) {
printf("failed seek on %s: %s\n", partition, strerror(errno));
return -1;
@@ -510,7 +481,6 @@ int WriteToPartition(unsigned char* data, size_t len, const char* target) {
}
}
- free(copy);
return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 17:17:01 +0100