diff --git a/applypatch/Android.mk b/applypatch/Android.mk
index eb3e4580..1f73fd89 100644
--- a/applypatch/Android.mk
+++ b/applypatch/Android.mk
@@ -17,7 +17,7 @@ LOCAL_PATH := $(call my-dir)
 include $(CLEAR_VARS)
 
 LOCAL_CLANG := true
-LOCAL_SRC_FILES := applypatch.c bspatch.c freecache.c imgpatch.c utils.c
+LOCAL_SRC_FILES := applypatch.cpp bspatch.cpp freecache.cpp imgpatch.cpp utils.cpp
 LOCAL_MODULE := libapplypatch
 LOCAL_MODULE_TAGS := eng
 LOCAL_C_INCLUDES += external/bzip2 external/zlib bootable/recovery
@@ -28,7 +28,7 @@ include $(BUILD_STATIC_LIBRARY)
 include $(CLEAR_VARS)
 
 LOCAL_CLANG := true
-LOCAL_SRC_FILES := main.c
+LOCAL_SRC_FILES := main.cpp
 LOCAL_MODULE := applypatch
 LOCAL_C_INCLUDES += bootable/recovery
 LOCAL_STATIC_LIBRARIES += libapplypatch libmtdutils libmincrypt libbz
@@ -39,7 +39,7 @@ include $(BUILD_EXECUTABLE)
 include $(CLEAR_VARS)
 
 LOCAL_CLANG := true
-LOCAL_SRC_FILES := main.c
+LOCAL_SRC_FILES := main.cpp
 LOCAL_MODULE := applypatch_static
 LOCAL_FORCE_STATIC_EXECUTABLE := true
 LOCAL_MODULE_TAGS := eng
@@ -52,7 +52,7 @@ include $(BUILD_EXECUTABLE)
 include $(CLEAR_VARS)
 
 LOCAL_CLANG := true
-LOCAL_SRC_FILES := imgdiff.c utils.c bsdiff.c
+LOCAL_SRC_FILES := imgdiff.cpp utils.cpp bsdiff.cpp
 LOCAL_MODULE := imgdiff
 LOCAL_FORCE_STATIC_EXECUTABLE := true
 LOCAL_C_INCLUDES += external/zlib external/bzip2
diff --git a/applypatch/applypatch.c b/applypatch/applypatch.cpp
similarity index 89%
rename from applypatch/applypatch.c
rename to applypatch/applypatch.cpp
index 2358d429..96bd88e8 100644
--- a/applypatch/applypatch.c
+++ b/applypatch/applypatch.cpp
@@ -15,6 +15,7 @@
  */
 
 #include <errno.h>
+#include <fcntl.h>
 #include <libgen.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -22,9 +23,7 @@
 #include <sys/stat.h>
 #include <sys/statfs.h>
 #include <sys/types.h>
-#include <fcntl.h>
 #include <unistd.h>
-#include <stdbool.h>
 
 #include "mincrypt/sha.h"
 #include "applypatch.h"
@@ -65,7 +64,7 @@ int LoadFileContents(const char* filename, FileContents* file) {
     }
 
     file->size = file->st.st_size;
-    file->data = malloc(file->size);
+    file->data = reinterpret_cast<unsigned char*>(malloc(file->size));
 
     FILE* f = fopen(filename, "rb");
     if (f == NULL) {
@@ -75,10 +74,9 @@ int LoadFileContents(const char* filename, FileContents* file) {
         return -1;
     }
 
-    ssize_t bytes_read = fread(file->data, 1, file->size, f);
-    if (bytes_read != file->size) {
-        printf("short read of \"%s\" (%ld bytes of %ld)\n",
-               filename, (long)bytes_read, (long)file->size);
+    size_t bytes_read = fread(file->data, 1, file->size, f);
+    if (bytes_read != static_cast<size_t>(file->size)) {
+        printf("short read of \"%s\" (%zu bytes of %zd)\n", filename, bytes_read, file->size);
         free(file->data);
         file->data = NULL;
         return -1;
@@ -93,8 +91,8 @@ 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) {
-    int aa = *(int*)a;
-    int bb = *(int*)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]) {
@@ -132,8 +130,7 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
     } else if (strcmp(magic, "EMMC") == 0) {
         type = EMMC;
     } else {
-        printf("LoadPartitionContents called with bad filename (%s)\n",
-               filename);
+        printf("LoadPartitionContents called with bad filename (%s)\n", filename);
         return -1;
     }
     const char* partition = strtok(NULL, ":");
@@ -151,9 +148,9 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
     }
 
     int pairs = (colons-1)/2;     // # of (size,sha1) pairs in filename
-    int* index = malloc(pairs * sizeof(int));
-    size_t* size = malloc(pairs * sizeof(size_t));
-    char** sha1sum = malloc(pairs * sizeof(char*));
+    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*)));
 
     for (i = 0; i < pairs; ++i) {
         const char* size_str = strtok(NULL, ":");
@@ -175,7 +172,7 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
     FILE* dev = NULL;
 
     switch (type) {
-        case MTD:
+        case MTD: {
             if (!mtd_partitions_scanned) {
                 mtd_scan_partitions();
                 mtd_partitions_scanned = 1;
@@ -195,6 +192,7 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
                 return -1;
             }
             break;
+        }
 
         case EMMC:
             dev = fopen(partition, "rb");
@@ -210,7 +208,7 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
     uint8_t parsed_sha[SHA_DIGEST_SIZE];
 
     // allocate enough memory to hold the largest size.
-    file->data = malloc(size[index[pairs-1]]);
+    file->data = reinterpret_cast<unsigned char*>(malloc(size[index[pairs-1]]));
     char* p = (char*)file->data;
     file->size = 0;                // # bytes read so far
 
@@ -248,8 +246,7 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
         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);
+            printf("failed to parse sha1 %s in %s\n", sha1sum[index[i]], filename);
             free(file->data);
             file->data = NULL;
             return -1;
@@ -280,15 +277,14 @@ 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.
-        printf("contents of partition \"%s\" didn't match %s\n",
-               partition, filename);
+        printf("contents of partition \"%s\" didn't match %s\n", partition, filename);
         free(file->data);
         file->data = NULL;
         return -1;
     }
 
     const uint8_t* sha_final = SHA_final(&sha_ctx);
-    for (i = 0; i < SHA_DIGEST_SIZE; ++i) {
+    for (size_t i = 0; i < SHA_DIGEST_SIZE; ++i) {
         file->sha1[i] = sha_final[i];
     }
 
@@ -311,16 +307,14 @@ static int LoadPartitionContents(const char* filename, FileContents* file) {
 int SaveFileContents(const char* filename, const FileContents* file) {
     int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, S_IRUSR | S_IWUSR);
     if (fd < 0) {
-        printf("failed to open \"%s\" for write: %s\n",
-               filename, strerror(errno));
+        printf("failed to open \"%s\" for write: %s\n", filename, strerror(errno));
         return -1;
     }
 
     ssize_t bytes_written = FileSink(file->data, file->size, &fd);
     if (bytes_written != file->size) {
-        printf("short write of \"%s\" (%ld bytes of %ld) (%s)\n",
-               filename, (long)bytes_written, (long)file->size,
-               strerror(errno));
+        printf("short write of \"%s\" (%zd bytes of %zd) (%s)\n",
+               filename, bytes_written, file->size, strerror(errno));
         close(fd);
         return -1;
     }
@@ -348,8 +342,7 @@ 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
 // success.
-int WriteToPartition(unsigned char* data, size_t len,
-                        const char* target) {
+int WriteToPartition(unsigned char* data, size_t len, const char* target) {
     char* copy = strdup(target);
     const char* magic = strtok(copy, ":");
 
@@ -370,7 +363,7 @@ int WriteToPartition(unsigned char* data, size_t len,
     }
 
     switch (type) {
-        case MTD:
+        case MTD: {
             if (!mtd_partitions_scanned) {
                 mtd_scan_partitions();
                 mtd_partitions_scanned = 1;
@@ -378,22 +371,19 @@ int WriteToPartition(unsigned char* data, size_t len,
 
             const MtdPartition* mtd = mtd_find_partition_by_name(partition);
             if (mtd == NULL) {
-                printf("mtd partition \"%s\" not found for writing\n",
-                       partition);
+                printf("mtd partition \"%s\" not found for writing\n", partition);
                 return -1;
             }
 
             MtdWriteContext* ctx = mtd_write_partition(mtd);
             if (ctx == NULL) {
-                printf("failed to init mtd partition \"%s\" for writing\n",
-                       partition);
+                printf("failed to init mtd partition \"%s\" for writing\n", partition);
                 return -1;
             }
 
-            size_t written = mtd_write_data(ctx, (char*)data, len);
+            size_t written = mtd_write_data(ctx, reinterpret_cast<char*>(data), len);
             if (written != len) {
-                printf("only wrote %zu of %zu bytes to MTD %s\n",
-                       written, len, partition);
+                printf("only wrote %zu of %zu bytes to MTD %s\n", written, len, partition);
                 mtd_write_close(ctx);
                 return -1;
             }
@@ -409,22 +399,20 @@ int WriteToPartition(unsigned char* data, size_t len,
                 return -1;
             }
             break;
+        }
 
-        case EMMC:
-        {
+        case EMMC: {
             size_t start = 0;
-            int success = 0;
+            bool success = false;
             int fd = open(partition, O_RDWR | O_SYNC);
             if (fd < 0) {
                 printf("failed to open %s: %s\n", partition, strerror(errno));
                 return -1;
             }
-            int attempt;
 
-            for (attempt = 0; attempt < 2; ++attempt) {
+            for (int 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));
+                    printf("failed seek on %s: %s\n", partition, strerror(errno));
                     return -1;
                 }
                 while (start < len) {
@@ -439,23 +427,20 @@ int WriteToPartition(unsigned char* data, size_t len,
                     start += written;
                 }
                 if (fsync(fd) != 0) {
-                   printf("failed to sync to %s (%s)\n",
-                          partition, strerror(errno));
+                   printf("failed to sync to %s (%s)\n", partition, strerror(errno));
                    return -1;
                 }
                 if (close(fd) != 0) {
-                   printf("failed to close %s (%s)\n",
-                          partition, strerror(errno));
+                   printf("failed to close %s (%s)\n", partition, strerror(errno));
                    return -1;
                 }
                 fd = open(partition, O_RDONLY);
                 if (fd < 0) {
-                   printf("failed to reopen %s for verify (%s)\n",
-                          partition, strerror(errno));
+                   printf("failed to reopen %s for verify (%s)\n", partition, strerror(errno));
                    return -1;
                 }
 
-                // drop caches so our subsequent verification read
+                // Drop caches so our subsequent verification read
                 // won't just be reading the cache.
                 sync();
                 int dc = open("/proc/sys/vm/drop_caches", O_WRONLY);
@@ -475,10 +460,11 @@ int WriteToPartition(unsigned char* data, size_t len,
                 }
                 unsigned char buffer[4096];
                 start = len;
-                size_t p;
-                for (p = 0; p < len; p += sizeof(buffer)) {
+                for (size_t p = 0; p < len; p += sizeof(buffer)) {
                     size_t to_read = len - p;
-                    if (to_read > sizeof(buffer)) to_read = sizeof(buffer);
+                    if (to_read > sizeof(buffer)) {
+                        to_read = sizeof(buffer);
+                    }
 
                     size_t so_far = 0;
                     while (so_far < to_read) {
@@ -489,14 +475,14 @@ int WriteToPartition(unsigned char* data, size_t len,
                                    partition, p, strerror(errno));
                             return -1;
                         }
-                        if ((size_t)read_count < to_read) {
+                        if (static_cast<size_t>(read_count) < to_read) {
                             printf("short verify read %s at %zu: %zd %zu %s\n",
                                    partition, p, read_count, to_read, strerror(errno));
                         }
                         so_far += read_count;
                     }
 
-                    if (memcmp(buffer, data+p, to_read)) {
+                    if (memcmp(buffer, data+p, to_read) != 0) {
                         printf("verification failed starting at %zu\n", p);
                         start = p;
                         break;
@@ -534,10 +520,9 @@ int WriteToPartition(unsigned char* data, size_t len,
 // the form "<digest>:<anything>".  Return 0 on success, -1 on any
 // error.
 int ParseSha1(const char* str, uint8_t* digest) {
-    int i;
     const char* ps = str;
     uint8_t* pd = digest;
-    for (i = 0; i < SHA_DIGEST_SIZE * 2; ++i, ++ps) {
+    for (int i = 0; i < SHA_DIGEST_SIZE * 2; ++i, ++ps) {
         int digit;
         if (*ps >= '0' && *ps <= '9') {
             digit = *ps - '0';
@@ -564,9 +549,8 @@ int ParseSha1(const char* str, uint8_t* digest) {
 // found.
 int FindMatchingPatch(uint8_t* sha1, char* const * const patch_sha1_str,
                       int num_patches) {
-    int i;
     uint8_t patch_sha1[SHA_DIGEST_SIZE];
-    for (i = 0; i < num_patches; ++i) {
+    for (int i = 0; i < num_patches; ++i) {
         if (ParseSha1(patch_sha1_str[i], patch_sha1) == 0 &&
             memcmp(patch_sha1, sha1, SHA_DIGEST_SIZE) == 0) {
             return i;
@@ -578,8 +562,8 @@ int FindMatchingPatch(uint8_t* sha1, char* const * const patch_sha1_str,
 // Returns 0 if the contents of the file (argv[2]) or the cached file
 // match any of the sha1's on the command line (argv[3:]).  Returns
 // nonzero otherwise.
-int applypatch_check(const char* filename,
-                     int num_patches, char** const patch_sha1_str) {
+int applypatch_check(const char* filename, int num_patches,
+                     char** const patch_sha1_str) {
     FileContents file;
     file.data = NULL;
 
@@ -624,13 +608,13 @@ int ShowLicenses() {
 }
 
 ssize_t FileSink(const unsigned char* data, ssize_t len, void* token) {
-    int fd = *(int *)token;
+    int fd = *reinterpret_cast<int *>(token);
     ssize_t done = 0;
     ssize_t wrote;
-    while (done < (ssize_t) len) {
+    while (done < len) {
         wrote = TEMP_FAILURE_RETRY(write(fd, data+done, len-done));
         if (wrote == -1) {
-            printf("error writing %d bytes: %s\n", (int)(len-done), strerror(errno));
+            printf("error writing %zd bytes: %s\n", (len-done), strerror(errno));
             return done;
         }
         done += wrote;
@@ -645,7 +629,7 @@ typedef struct {
 } MemorySinkInfo;
 
 ssize_t MemorySink(const unsigned char* data, ssize_t len, void* token) {
-    MemorySinkInfo* msi = (MemorySinkInfo*)token;
+    MemorySinkInfo* msi = reinterpret_cast<MemorySinkInfo*>(token);
     if (msi->size - msi->pos < len) {
         return -1;
     }
@@ -675,9 +659,8 @@ int CacheSizeCheck(size_t bytes) {
 }
 
 static void print_short_sha1(const uint8_t sha1[SHA_DIGEST_SIZE]) {
-    int i;
     const char* hex = "0123456789abcdef";
-    for (i = 0; i < 4; ++i) {
+    for (size_t i = 0; i < 4; ++i) {
         putchar(hex[(sha1[i]>>4) & 0xf]);
         putchar(hex[sha1[i] & 0xf]);
     }
@@ -719,8 +702,7 @@ int applypatch(const char* source_filename,
                Value* bonus_data) {
     printf("patch %s: ", source_filename);
 
-    if (target_filename[0] == '-' &&
-        target_filename[1] == '\0') {
+    if (target_filename[0] == '-' && target_filename[1] == '\0') {
         target_filename = source_filename;
     }
 
@@ -761,8 +743,7 @@ int applypatch(const char* source_filename,
     }
 
     if (source_file.data != NULL) {
-        int to_use = FindMatchingPatch(source_file.sha1,
-                                       patch_sha1_str, num_patches);
+        int to_use = FindMatchingPatch(source_file.sha1, patch_sha1_str, num_patches);
         if (to_use >= 0) {
             source_patch_value = patch_data[to_use];
         }
@@ -779,8 +760,7 @@ int applypatch(const char* source_filename,
             return 1;
         }
 
-        int to_use = FindMatchingPatch(copy_file.sha1,
-                                       patch_sha1_str, num_patches);
+        int to_use = FindMatchingPatch(copy_file.sha1, patch_sha1_str, num_patches);
         if (to_use >= 0) {
             copy_patch_value = patch_data[to_use];
         }
@@ -865,8 +845,8 @@ static int GenerateTarget(FileContents* source_file,
                     (free_space > (256 << 10)) &&          // 256k (two-block) minimum
                     (free_space > (target_size * 3 / 2));  // 50% margin of error
                 if (!enough_space) {
-                    printf("target %ld bytes; free space %ld bytes; retry %d; enough %d\n",
-                           (long)target_size, (long)free_space, retry, enough_space);
+                    printf("target %zu bytes; free space %zu bytes; retry %d; enough %d\n",
+                           target_size, free_space, retry, enough_space);
                 }
             }
 
@@ -884,8 +864,7 @@ static int GenerateTarget(FileContents* source_file,
                     // It's impossible to free space on the target filesystem by
                     // deleting the source if the source is a partition.  If
                     // we're ever in a state where we need to do this, fail.
-                    printf("not enough free space for target but source "
-                           "is partition\n");
+                    printf("not enough free space for target but source is partition\n");
                     return 1;
                 }
 
@@ -902,7 +881,7 @@ static int GenerateTarget(FileContents* source_file,
                 unlink(source_filename);
 
                 size_t free_space = FreeSpaceForFile(target_fs);
-                printf("(now %ld bytes free for target) ", (long)free_space);
+                printf("(now %zu bytes free for target) ", free_space);
             }
         }
 
@@ -927,10 +906,9 @@ static int GenerateTarget(FileContents* source_file,
         if (strncmp(target_filename, "MTD:", 4) == 0 ||
             strncmp(target_filename, "EMMC:", 5) == 0) {
             // We store the decoded output in memory.
-            msi.buffer = malloc(target_size);
+            msi.buffer = reinterpret_cast<unsigned char*>(malloc(target_size));
             if (msi.buffer == NULL) {
-                printf("failed to alloc %ld bytes for output\n",
-                       (long)target_size);
+                printf("failed to alloc %zu bytes for output\n", target_size);
                 return 1;
             }
             msi.pos = 0;
@@ -939,12 +917,11 @@ static int GenerateTarget(FileContents* source_file,
             token = &msi;
         } else {
             // We write the decoded output to "<tgt-file>.patch".
-            outname = (char*)malloc(strlen(target_filename) + 10);
+            outname = reinterpret_cast<char*>(malloc(strlen(target_filename) + 10));
             strcpy(outname, target_filename);
             strcat(outname, ".patch");
 
-            output = open(outname, O_WRONLY | O_CREAT | O_TRUNC | O_SYNC,
-                S_IRUSR | S_IWUSR);
+            output = open(outname, O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, S_IRUSR | S_IWUSR);
             if (output < 0) {
                 printf("failed to open output file %s: %s\n",
                        outname, strerror(errno));
@@ -1025,23 +1002,23 @@ static int GenerateTarget(FileContents* source_file,
             printf("chmod of \"%s\" failed: %s\n", outname, strerror(errno));
             return 1;
         }
-        if (chown(outname, source_to_use->st.st_uid,
-                  source_to_use->st.st_gid) != 0) {
+        if (chown(outname, source_to_use->st.st_uid, source_to_use->st.st_gid) != 0) {
             printf("chown of \"%s\" failed: %s\n", outname, strerror(errno));
             return 1;
         }
 
         // Finally, rename the .patch file to replace the target file.
         if (rename(outname, target_filename) != 0) {
-            printf("rename of .patch to \"%s\" failed: %s\n",
-                   target_filename, strerror(errno));
+            printf("rename of .patch to \"%s\" failed: %s\n", target_filename, strerror(errno));
             return 1;
         }
     }
 
     // If this run of applypatch created the copy, and we're here, we
     // can delete it.
-    if (made_copy) unlink(CACHE_TEMP_SOURCE);
+    if (made_copy) {
+        unlink(CACHE_TEMP_SOURCE);
+    }
 
     // Success!
     return 0;
diff --git a/applypatch/bsdiff.c b/applypatch/bsdiff.cpp
similarity index 87%
rename from applypatch/bsdiff.c
rename to applypatch/bsdiff.cpp
index b6d342b7..55dbe5cf 100644
--- a/applypatch/bsdiff.c
+++ b/applypatch/bsdiff.cpp
@@ -156,24 +156,24 @@ static void qsufsort(off_t *I,off_t *V,u_char *old,off_t oldsize)
 	for(i=0;i<oldsize+1;i++) I[V[i]]=i;
 }
 
-static off_t matchlen(u_char *old,off_t oldsize,u_char *new,off_t newsize)
+static off_t matchlen(u_char *olddata,off_t oldsize,u_char *newdata,off_t newsize)
 {
 	off_t i;
 
 	for(i=0;(i<oldsize)&&(i<newsize);i++)
-		if(old[i]!=new[i]) break;
+		if(olddata[i]!=newdata[i]) break;
 
 	return i;
 }
 
 static off_t search(off_t *I,u_char *old,off_t oldsize,
-		u_char *new,off_t newsize,off_t st,off_t en,off_t *pos)
+		u_char *newdata,off_t newsize,off_t st,off_t en,off_t *pos)
 {
 	off_t x,y;
 
 	if(en-st<2) {
-		x=matchlen(old+I[st],oldsize-I[st],new,newsize);
-		y=matchlen(old+I[en],oldsize-I[en],new,newsize);
+		x=matchlen(old+I[st],oldsize-I[st],newdata,newsize);
+		y=matchlen(old+I[en],oldsize-I[en],newdata,newsize);
 
 		if(x>y) {
 			*pos=I[st];
@@ -185,10 +185,10 @@ static off_t search(off_t *I,u_char *old,off_t oldsize,
 	};
 
 	x=st+(en-st)/2;
-	if(memcmp(old+I[x],new,MIN(oldsize-I[x],newsize))<0) {
-		return search(I,old,oldsize,new,newsize,x,en,pos);
+	if(memcmp(old+I[x],newdata,MIN(oldsize-I[x],newsize))<0) {
+		return search(I,old,oldsize,newdata,newsize,x,en,pos);
 	} else {
-		return search(I,old,oldsize,new,newsize,st,x,pos);
+		return search(I,old,oldsize,newdata,newsize,st,x,pos);
 	};
 }
 
@@ -212,8 +212,8 @@ static void offtout(off_t x,u_char *buf)
 
 // This is main() from bsdiff.c, with the following changes:
 //
-//    - old, oldsize, new, newsize are arguments; we don't load this
-//      data from files.  old and new are owned by the caller; we
+//    - old, oldsize, newdata, newsize are arguments; we don't load this
+//      data from files.  old and newdata are owned by the caller; we
 //      don't free them at the end.
 //
 //    - the "I" block of memory is owned by the caller, who passes a
@@ -221,7 +221,7 @@ static void offtout(off_t x,u_char *buf)
 //      bsdiff() multiple times with the same 'old' data, we only do
 //      the qsufsort() step the first time.
 //
-int bsdiff(u_char* old, off_t oldsize, off_t** IP, u_char* new, off_t newsize,
+int bsdiff(u_char* old, off_t oldsize, off_t** IP, u_char* newdata, off_t newsize,
            const char* patch_filename)
 {
 	int fd;
@@ -242,15 +242,15 @@ int bsdiff(u_char* old, off_t oldsize, off_t** IP, u_char* new, off_t newsize,
 
         if (*IP == NULL) {
             off_t* V;
-            *IP = malloc((oldsize+1) * sizeof(off_t));
-            V = malloc((oldsize+1) * sizeof(off_t));
+            *IP = reinterpret_cast<off_t*>(malloc((oldsize+1) * sizeof(off_t)));
+            V = reinterpret_cast<off_t*>(malloc((oldsize+1) * sizeof(off_t)));
             qsufsort(*IP, V, old, oldsize);
             free(V);
         }
         I = *IP;
 
-	if(((db=malloc(newsize+1))==NULL) ||
-		((eb=malloc(newsize+1))==NULL)) err(1,NULL);
+	if(((db=reinterpret_cast<u_char*>(malloc(newsize+1)))==NULL) ||
+		((eb=reinterpret_cast<u_char*>(malloc(newsize+1)))==NULL)) err(1,NULL);
 	dblen=0;
 	eblen=0;
 
@@ -284,26 +284,26 @@ int bsdiff(u_char* old, off_t oldsize, off_t** IP, u_char* new, off_t newsize,
 		oldscore=0;
 
 		for(scsc=scan+=len;scan<newsize;scan++) {
-			len=search(I,old,oldsize,new+scan,newsize-scan,
+			len=search(I,old,oldsize,newdata+scan,newsize-scan,
 					0,oldsize,&pos);
 
 			for(;scsc<scan+len;scsc++)
 			if((scsc+lastoffset<oldsize) &&
-				(old[scsc+lastoffset] == new[scsc]))
+				(old[scsc+lastoffset] == newdata[scsc]))
 				oldscore++;
 
 			if(((len==oldscore) && (len!=0)) ||
 				(len>oldscore+8)) break;
 
 			if((scan+lastoffset<oldsize) &&
-				(old[scan+lastoffset] == new[scan]))
+				(old[scan+lastoffset] == newdata[scan]))
 				oldscore--;
 		};
 
 		if((len!=oldscore) || (scan==newsize)) {
 			s=0;Sf=0;lenf=0;
 			for(i=0;(lastscan+i<scan)&&(lastpos+i<oldsize);) {
-				if(old[lastpos+i]==new[lastscan+i]) s++;
+				if(old[lastpos+i]==newdata[lastscan+i]) s++;
 				i++;
 				if(s*2-i>Sf*2-lenf) { Sf=s; lenf=i; };
 			};
@@ -312,7 +312,7 @@ int bsdiff(u_char* old, off_t oldsize, off_t** IP, u_char* new, off_t newsize,
 			if(scan<newsize) {
 				s=0;Sb=0;
 				for(i=1;(scan>=lastscan+i)&&(pos>=i);i++) {
-					if(old[pos-i]==new[scan-i]) s++;
+					if(old[pos-i]==newdata[scan-i]) s++;
 					if(s*2-i>Sb*2-lenb) { Sb=s; lenb=i; };
 				};
 			};
@@ -321,9 +321,9 @@ int bsdiff(u_char* old, off_t oldsize, off_t** IP, u_char* new, off_t newsize,
 				overlap=(lastscan+lenf)-(scan-lenb);
 				s=0;Ss=0;lens=0;
 				for(i=0;i<overlap;i++) {
-					if(new[lastscan+lenf-overlap+i]==
+					if(newdata[lastscan+lenf-overlap+i]==
 					   old[lastpos+lenf-overlap+i]) s++;
-					if(new[scan-lenb+i]==
+					if(newdata[scan-lenb+i]==
 					   old[pos-lenb+i]) s--;
 					if(s>Ss) { Ss=s; lens=i+1; };
 				};
@@ -333,9 +333,9 @@ int bsdiff(u_char* old, off_t oldsize, off_t** IP, u_char* new, off_t newsize,
 			};
 
 			for(i=0;i<lenf;i++)
-				db[dblen+i]=new[lastscan+i]-old[lastpos+i];
+				db[dblen+i]=newdata[lastscan+i]-old[lastpos+i];
 			for(i=0;i<(scan-lenb)-(lastscan+lenf);i++)
-				eb[eblen+i]=new[lastscan+lenf+i];
+				eb[eblen+i]=newdata[lastscan+lenf+i];
 
 			dblen+=lenf;
 			eblen+=(scan-lenb)-(lastscan+lenf);
diff --git a/applypatch/bspatch.c b/applypatch/bspatch.cpp
similarity index 98%
rename from applypatch/bspatch.c
rename to applypatch/bspatch.cpp
index b57760ed..9d201b47 100644
--- a/applypatch/bspatch.c
+++ b/applypatch/bspatch.cpp
@@ -182,10 +182,9 @@ int ApplyBSDiffPatchMem(const unsigned char* old_data, ssize_t old_size,
         printf("failed to bzinit extra stream (%d)\n", bzerr);
     }
 
-    *new_data = malloc(*new_size);
+    *new_data = reinterpret_cast<unsigned char*>(malloc(*new_size));
     if (*new_data == NULL) {
-        printf("failed to allocate %ld bytes of memory for output file\n",
-               (long)*new_size);
+        printf("failed to allocate %zd bytes of memory for output file\n", *new_size);
         return 1;
     }
 
diff --git a/applypatch/freecache.c b/applypatch/freecache.cpp
similarity index 80%
rename from applypatch/freecache.c
rename to applypatch/freecache.cpp
index 9827fda0..2eb2f55e 100644
--- a/applypatch/freecache.c
+++ b/applypatch/freecache.cpp
@@ -1,3 +1,19 @@
+/*
+ * Copyright (C) 2010 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 <errno.h>
 #include <libgen.h>
 #include <stdio.h>
@@ -76,7 +92,7 @@ int FindExpendableFiles(char*** names, int* entries) {
   struct dirent* de;
   int size = 32;
   *entries = 0;
-  *names = malloc(size * sizeof(char*));
+  *names = reinterpret_cast<char**>(malloc(size * sizeof(char*)));
 
   char path[FILENAME_MAX];
 
@@ -84,8 +100,7 @@ int FindExpendableFiles(char*** names, int* entries) {
   // directories.
   const char* dirs[2] = {"/cache", "/cache/recovery/otatest"};
 
-  unsigned int i;
-  for (i = 0; i < sizeof(dirs)/sizeof(dirs[0]); ++i) {
+  for (size_t i = 0; i < sizeof(dirs)/sizeof(dirs[0]); ++i) {
     d = opendir(dirs[i]);
     if (d == NULL) {
       printf("error opening %s: %s\n", dirs[i], strerror(errno));
@@ -107,7 +122,7 @@ int FindExpendableFiles(char*** names, int* entries) {
       if (stat(path, &st) == 0 && S_ISREG(st.st_mode)) {
         if (*entries >= size) {
           size *= 2;
-          *names = realloc(*names, size * sizeof(char*));
+          *names = reinterpret_cast<char**>(realloc(*names, size * sizeof(char*)));
         }
         (*names)[(*entries)++] = strdup(path);
       }
@@ -127,8 +142,7 @@ int FindExpendableFiles(char*** names, int* entries) {
 
 int MakeFreeSpaceOnCache(size_t bytes_needed) {
   size_t free_now = FreeSpaceForFile("/cache");
-  printf("%ld bytes free on /cache (%ld needed)\n",
-         (long)free_now, (long)bytes_needed);
+  printf("%zu bytes free on /cache (%zu needed)\n", free_now, bytes_needed);
 
   if (free_now >= bytes_needed) {
     return 0;
@@ -158,7 +172,7 @@ int MakeFreeSpaceOnCache(size_t bytes_needed) {
     if (names[i]) {
       unlink(names[i]);
       free_now = FreeSpaceForFile("/cache");
-      printf("deleted %s; now %ld bytes free\n", names[i], (long)free_now);
+      printf("deleted %s; now %zu bytes free\n", names[i], free_now);
       free(names[i]);
     }
   }
diff --git a/applypatch/imgdiff.c b/applypatch/imgdiff.cpp
similarity index 92%
rename from applypatch/imgdiff.c
rename to applypatch/imgdiff.cpp
index 3bac8be9..4d83ffb2 100644
--- a/applypatch/imgdiff.c
+++ b/applypatch/imgdiff.cpp
@@ -122,6 +122,7 @@
  */
 
 #include <errno.h>
+#include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -179,7 +180,7 @@ static int fileentry_compare(const void* a, const void* b) {
 }
 
 // from bsdiff.c
-int bsdiff(u_char* old, off_t oldsize, off_t** IP, u_char* new, off_t newsize,
+int bsdiff(u_char* old, off_t oldsize, off_t** IP, u_char* newdata, off_t newsize,
            const char* patch_filename);
 
 unsigned char* ReadZip(const char* filename,
@@ -191,9 +192,10 @@ unsigned char* ReadZip(const char* filename,
     return NULL;
   }
 
-  unsigned char* img = malloc(st.st_size);
+  size_t sz = static_cast<size_t>(st.st_size);
+  unsigned char* img = reinterpret_cast<unsigned char*>(malloc(sz));
   FILE* f = fopen(filename, "rb");
-  if (fread(img, 1, st.st_size, f) != st.st_size) {
+  if (fread(img, 1, sz, f) != sz) {
     printf("failed to read \"%s\" %s\n", filename, strerror(errno));
     fclose(f);
     return NULL;
@@ -218,7 +220,8 @@ unsigned char* ReadZip(const char* filename,
   int cdcount = Read2(img+i+8);
   int cdoffset = Read4(img+i+16);
 
-  ZipFileEntry* temp_entries = malloc(cdcount * sizeof(ZipFileEntry));
+  ZipFileEntry* temp_entries = reinterpret_cast<ZipFileEntry*>(malloc(
+      cdcount * sizeof(ZipFileEntry)));
   int entrycount = 0;
 
   unsigned char* cd = img+cdoffset;
@@ -235,7 +238,7 @@ unsigned char* ReadZip(const char* filename,
     int mlen = Read2(cd+32);   // file comment len
     int hoffset = Read4(cd+42);   // local header offset
 
-    char* filename = malloc(nlen+1);
+    char* filename = reinterpret_cast<char*>(malloc(nlen+1));
     memcpy(filename, cd+46, nlen);
     filename[nlen] = '\0';
 
@@ -284,7 +287,7 @@ unsigned char* ReadZip(const char* filename,
 #endif
 
   *num_chunks = 0;
-  *chunks = malloc((entrycount*2+2) * sizeof(ImageChunk));
+  *chunks = reinterpret_cast<ImageChunk*>(malloc((entrycount*2+2) * sizeof(ImageChunk)));
   ImageChunk* curr = *chunks;
 
   if (include_pseudo_chunk) {
@@ -311,7 +314,7 @@ unsigned char* ReadZip(const char* filename,
       curr->I = NULL;
 
       curr->len = temp_entries[nextentry].uncomp_len;
-      curr->data = malloc(curr->len);
+      curr->data = reinterpret_cast<unsigned char*>(malloc(curr->len));
 
       z_stream strm;
       strm.zalloc = Z_NULL;
@@ -381,9 +384,10 @@ unsigned char* ReadImage(const char* filename,
     return NULL;
   }
 
-  unsigned char* img = malloc(st.st_size + 4);
+  size_t sz = static_cast<size_t>(st.st_size);
+  unsigned char* img = reinterpret_cast<unsigned char*>(malloc(sz + 4));
   FILE* f = fopen(filename, "rb");
-  if (fread(img, 1, st.st_size, f) != st.st_size) {
+  if (fread(img, 1, sz, f) != sz) {
     printf("failed to read \"%s\" %s\n", filename, strerror(errno));
     fclose(f);
     return NULL;
@@ -393,17 +397,17 @@ unsigned char* ReadImage(const char* filename,
   // append 4 zero bytes to the data so we can always search for the
   // four-byte string 1f8b0800 starting at any point in the actual
   // file data, without special-casing the end of the data.
-  memset(img+st.st_size, 0, 4);
+  memset(img+sz, 0, 4);
 
   size_t pos = 0;
 
   *num_chunks = 0;
   *chunks = NULL;
 
-  while (pos < st.st_size) {
+  while (pos < sz) {
     unsigned char* p = img+pos;
 
-    if (st.st_size - pos >= 4 &&
+    if (sz - pos >= 4 &&
         p[0] == 0x1f && p[1] == 0x8b &&
         p[2] == 0x08 &&    // deflate compression
         p[3] == 0x00) {    // no header flags
@@ -411,7 +415,8 @@ unsigned char* ReadImage(const char* filename,
       size_t chunk_offset = pos;
 
       *num_chunks += 3;
-      *chunks = realloc(*chunks, *num_chunks * sizeof(ImageChunk));
+      *chunks = reinterpret_cast<ImageChunk*>(realloc(*chunks,
+          *num_chunks * sizeof(ImageChunk)));
       ImageChunk* curr = *chunks + (*num_chunks-3);
 
       // create a normal chunk for the header.
@@ -435,7 +440,7 @@ unsigned char* ReadImage(const char* filename,
 
       size_t allocated = 32768;
       curr->len = 0;
-      curr->data = malloc(allocated);
+      curr->data = reinterpret_cast<unsigned char*>(malloc(allocated));
       curr->start = pos;
       curr->deflate_data = p;
 
@@ -443,7 +448,7 @@ unsigned char* ReadImage(const char* filename,
       strm.zalloc = Z_NULL;
       strm.zfree = Z_NULL;
       strm.opaque = Z_NULL;
-      strm.avail_in = st.st_size - pos;
+      strm.avail_in = sz - pos;
       strm.next_in = p;
 
       // -15 means we are decoding a 'raw' deflate stream; zlib will
@@ -465,11 +470,11 @@ unsigned char* ReadImage(const char* filename,
         curr->len = allocated - strm.avail_out;
         if (strm.avail_out == 0) {
           allocated *= 2;
-          curr->data = realloc(curr->data, allocated);
+          curr->data = reinterpret_cast<unsigned char*>(realloc(curr->data, allocated));
         }
       } while (ret != Z_STREAM_END);
 
-      curr->deflate_len = st.st_size - strm.avail_in - pos;
+      curr->deflate_len = sz - strm.avail_in - pos;
       inflateEnd(&strm);
       pos += curr->deflate_len;
       p += curr->deflate_len;
@@ -493,8 +498,8 @@ unsigned char* ReadImage(const char* filename,
       // the decompression.
       size_t footer_size = Read4(p-4);
       if (footer_size != curr[-2].len) {
-        printf("Error: footer size %d != decompressed size %d\n",
-                footer_size, curr[-2].len);
+        printf("Error: footer size %zu != decompressed size %zu\n",
+            footer_size, curr[-2].len);
         free(img);
         return NULL;
       }
@@ -502,7 +507,7 @@ unsigned char* ReadImage(const char* filename,
       // Reallocate the list for every chunk; we expect the number of
       // chunks to be small (5 for typical boot and recovery images).
       ++*num_chunks;
-      *chunks = realloc(*chunks, *num_chunks * sizeof(ImageChunk));
+      *chunks = reinterpret_cast<ImageChunk*>(realloc(*chunks, *num_chunks * sizeof(ImageChunk)));
       ImageChunk* curr = *chunks + (*num_chunks-1);
       curr->start = pos;
       curr->I = NULL;
@@ -512,7 +517,7 @@ unsigned char* ReadImage(const char* filename,
       curr->type = CHUNK_NORMAL;
       curr->data = p;
 
-      for (curr->len = 0; curr->len < (st.st_size - pos); ++curr->len) {
+      for (curr->len = 0; curr->len < (sz - pos); ++curr->len) {
         if (p[curr->len] == 0x1f &&
             p[curr->len+1] == 0x8b &&
             p[curr->len+2] == 0x08 &&
@@ -587,7 +592,7 @@ int ReconstructDeflateChunk(ImageChunk* chunk) {
   }
 
   size_t p = 0;
-  unsigned char* out = malloc(BUFFER_SIZE);
+  unsigned char* out = reinterpret_cast<unsigned char*>(malloc(BUFFER_SIZE));
 
   // We only check two combinations of encoder parameters:  level 6
   // (the default) and level 9 (the maximum).
@@ -638,9 +643,11 @@ unsigned char* MakePatch(ImageChunk* src, ImageChunk* tgt, size_t* size) {
     return NULL;
   }
 
-  unsigned char* data = malloc(st.st_size);
+  size_t sz = static_cast<size_t>(st.st_size);
+  // TODO: Memory leak on error return.
+  unsigned char* data = reinterpret_cast<unsigned char*>(malloc(sz));
 
-  if (tgt->type == CHUNK_NORMAL && tgt->len <= st.st_size) {
+  if (tgt->type == CHUNK_NORMAL && tgt->len <= sz) {
     unlink(ptemp);
 
     tgt->type = CHUNK_RAW;
@@ -648,14 +655,14 @@ unsigned char* MakePatch(ImageChunk* src, ImageChunk* tgt, size_t* size) {
     return tgt->data;
   }
 
-  *size = st.st_size;
+  *size = sz;
 
   FILE* f = fopen(ptemp, "rb");
   if (f == NULL) {
     printf("failed to open patch %s: %s\n", ptemp, strerror(errno));
     return NULL;
   }
-  if (fread(data, 1, st.st_size, f) != st.st_size) {
+  if (fread(data, 1, sz, f) != sz) {
     printf("failed to read patch %s: %s\n", ptemp, strerror(errno));
     return NULL;
   }
@@ -781,9 +788,8 @@ ImageChunk* FindChunkByName(const char* name,
 }
 
 void DumpChunks(ImageChunk* chunks, int num_chunks) {
-    int i;
-    for (i = 0; i < num_chunks; ++i) {
-        printf("chunk %d: type %d start %d len %d\n",
+    for (int i = 0; i < num_chunks; ++i) {
+        printf("chunk %d: type %d start %zu len %zu\n",
                i, chunks[i].type, chunks[i].start, chunks[i].len);
     }
 }
@@ -806,7 +812,7 @@ int main(int argc, char** argv) {
       return 1;
     }
     bonus_size = st.st_size;
-    bonus_data = malloc(bonus_size);
+    bonus_data = reinterpret_cast<unsigned char*>(malloc(bonus_size));
     FILE* f = fopen(argv[2], "rb");
     if (f == NULL) {
       printf("failed to open bonus file %s: %s\n", argv[2], strerror(errno));
@@ -953,8 +959,9 @@ int main(int argc, char** argv) {
   DumpChunks(src_chunks, num_src_chunks);
 
   printf("Construct patches for %d chunks...\n", num_tgt_chunks);
-  unsigned char** patch_data = malloc(num_tgt_chunks * sizeof(unsigned char*));
-  size_t* patch_size = malloc(num_tgt_chunks * sizeof(size_t));
+  unsigned char** patch_data = reinterpret_cast<unsigned char**>(malloc(
+      num_tgt_chunks * sizeof(unsigned char*)));
+  size_t* patch_size = reinterpret_cast<size_t*>(malloc(num_tgt_chunks * sizeof(size_t)));
   for (i = 0; i < num_tgt_chunks; ++i) {
     if (zip_mode) {
       ImageChunk* src;
@@ -967,15 +974,16 @@ int main(int argc, char** argv) {
       }
     } else {
       if (i == 1 && bonus_data) {
-        printf("  using %d bytes of bonus data for chunk %d\n", bonus_size, i);
-        src_chunks[i].data = realloc(src_chunks[i].data, src_chunks[i].len + bonus_size);
+        printf("  using %zu bytes of bonus data for chunk %d\n", bonus_size, i);
+        src_chunks[i].data = reinterpret_cast<unsigned char*>(realloc(src_chunks[i].data,
+            src_chunks[i].len + bonus_size));
         memcpy(src_chunks[i].data+src_chunks[i].len, bonus_data, bonus_size);
         src_chunks[i].len += bonus_size;
      }
 
       patch_data[i] = MakePatch(src_chunks+i, tgt_chunks+i, patch_size+i);
     }
-    printf("patch %3d is %d bytes (of %d)\n",
+    printf("patch %3d is %zu bytes (of %zu)\n",
            i, patch_size[i], tgt_chunks[i].source_len);
   }
 
@@ -1012,7 +1020,7 @@ int main(int argc, char** argv) {
 
     switch (tgt_chunks[i].type) {
       case CHUNK_NORMAL:
-        printf("chunk %3d: normal   (%10d, %10d)  %10d\n", i,
+        printf("chunk %3d: normal   (%10zu, %10zu)  %10zu\n", i,
                tgt_chunks[i].start, tgt_chunks[i].len, patch_size[i]);
         Write8(tgt_chunks[i].source_start, f);
         Write8(tgt_chunks[i].source_len, f);
@@ -1021,7 +1029,7 @@ int main(int argc, char** argv) {
         break;
 
       case CHUNK_DEFLATE:
-        printf("chunk %3d: deflate  (%10d, %10d)  %10d  %s\n", i,
+        printf("chunk %3d: deflate  (%10zu, %10zu)  %10zu  %s\n", i,
                tgt_chunks[i].start, tgt_chunks[i].deflate_len, patch_size[i],
                tgt_chunks[i].filename);
         Write8(tgt_chunks[i].source_start, f);
@@ -1038,7 +1046,7 @@ int main(int argc, char** argv) {
         break;
 
       case CHUNK_RAW:
-        printf("chunk %3d: raw      (%10d, %10d)\n", i,
+        printf("chunk %3d: raw      (%10zu, %10zu)\n", i,
                tgt_chunks[i].start, tgt_chunks[i].len);
         Write4(patch_size[i], f);
         fwrite(patch_data[i], 1, patch_size[i], f);
diff --git a/applypatch/imgpatch.c b/applypatch/imgpatch.cpp
similarity index 97%
rename from applypatch/imgpatch.c
rename to applypatch/imgpatch.cpp
index 09b0a739..26888f8e 100644
--- a/applypatch/imgpatch.c
+++ b/applypatch/imgpatch.cpp
@@ -132,7 +132,7 @@ int ApplyImagePatch(const unsigned char* old_data, ssize_t old_size __unused,
             // must be appended from the bonus_data value.
             size_t bonus_size = (i == 1 && bonus_data != NULL) ? bonus_data->size : 0;
 
-            unsigned char* expanded_source = malloc(expanded_len);
+            unsigned char* expanded_source = reinterpret_cast<unsigned char*>(malloc(expanded_len));
             if (expanded_source == NULL) {
                 printf("failed to allocate %zu bytes for expanded_source\n",
                        expanded_len);
@@ -196,7 +196,7 @@ int ApplyImagePatch(const unsigned char* old_data, ssize_t old_size __unused,
                 // ... unless the buffer is too small, in which case we'll
                 // allocate a fresh one.
                 free(temp_data);
-                temp_data = malloc(32768);
+                temp_data = reinterpret_cast<unsigned char*>(malloc(32768));
                 temp_size = 32768;
             }
 
diff --git a/applypatch/main.c b/applypatch/main.cpp
similarity index 87%
rename from applypatch/main.c
rename to applypatch/main.cpp
index 8e9fe80e..63ff5c2c 100644
--- a/applypatch/main.c
+++ b/applypatch/main.cpp
@@ -23,14 +23,14 @@
 #include "edify/expr.h"
 #include "mincrypt/sha.h"
 
-int CheckMode(int argc, char** argv) {
+static int CheckMode(int argc, char** argv) {
     if (argc < 3) {
         return 2;
     }
     return applypatch_check(argv[2], argc-3, argv+3);
 }
 
-int SpaceMode(int argc, char** argv) {
+static int SpaceMode(int argc, char** argv) {
     if (argc != 3) {
         return 2;
     }
@@ -45,19 +45,18 @@ int SpaceMode(int argc, char** argv) {
 
 // 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 0 on
+// *patches (loading file contents into the patches).  Returns true on
 // success.
-static int ParsePatchArgs(int argc, char** argv,
+static bool ParsePatchArgs(int argc, char** argv,
                           char*** sha1s, Value*** patches, int* num_patches) {
     *num_patches = argc;
-    *sha1s = malloc(*num_patches * sizeof(char*));
-    *patches = malloc(*num_patches * sizeof(Value*));
+    *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];
 
-    int i;
-    for (i = 0; i < *num_patches; ++i) {
+    for (int i = 0; i < *num_patches; ++i) {
         char* colon = strchr(argv[i], ':');
         if (colon != NULL) {
             *colon = '\0';
@@ -66,7 +65,7 @@ static int ParsePatchArgs(int argc, char** argv,
 
         if (ParseSha1(argv[i], digest) != 0) {
             printf("failed to parse sha1 \"%s\"\n", argv[i]);
-            return -1;
+            return false;
         }
 
         (*sha1s)[i] = argv[i];
@@ -77,17 +76,17 @@ static int ParsePatchArgs(int argc, char** argv,
             if (LoadFileContents(colon, &fc) != 0) {
                 goto abort;
             }
-            (*patches)[i] = malloc(sizeof(Value));
+            (*patches)[i] = reinterpret_cast<Value*>(malloc(sizeof(Value)));
             (*patches)[i]->type = VAL_BLOB;
             (*patches)[i]->size = fc.size;
-            (*patches)[i]->data = (char*)fc.data;
+            (*patches)[i]->data = reinterpret_cast<char*>(fc.data);
         }
     }
 
-    return 0;
+    return true;
 
   abort:
-    for (i = 0; i < *num_patches; ++i) {
+    for (int i = 0; i < *num_patches; ++i) {
         Value* p = (*patches)[i];
         if (p != NULL) {
             free(p->data);
@@ -96,7 +95,7 @@ static int ParsePatchArgs(int argc, char** argv,
     }
     free(*sha1s);
     free(*patches);
-    return -1;
+    return false;
 }
 
 int PatchMode(int argc, char** argv) {
@@ -107,7 +106,7 @@ int PatchMode(int argc, char** argv) {
             printf("failed to load bonus file %s\n", argv[2]);
             return 1;
         }
-        bonus = malloc(sizeof(Value));
+        bonus = reinterpret_cast<Value*>(malloc(sizeof(Value)));
         bonus->type = VAL_BLOB;
         bonus->size = fc.size;
         bonus->data = (char*)fc.data;
@@ -129,7 +128,7 @@ int PatchMode(int argc, char** argv) {
     char** sha1s;
     Value** patches;
     int num_patches;
-    if (ParsePatchArgs(argc-5, argv+5, &sha1s, &patches, &num_patches) != 0) {
+    if (!ParsePatchArgs(argc-5, argv+5, &sha1s, &patches, &num_patches)) {
         printf("failed to parse patch args\n");
         return 1;
     }
diff --git a/applypatch/utils.c b/applypatch/utils.cpp
similarity index 91%
rename from applypatch/utils.c
rename to applypatch/utils.cpp
index 41ff676d..4a80be75 100644
--- a/applypatch/utils.c
+++ b/applypatch/utils.cpp
@@ -39,13 +39,13 @@ void Write8(long long value, FILE* f) {
 }
 
 int Read2(void* pv) {
-    unsigned char* p = pv;
+    unsigned char* p = reinterpret_cast<unsigned char*>(pv);
     return (int)(((unsigned int)p[1] << 8) |
                  (unsigned int)p[0]);
 }
 
 int Read4(void* pv) {
-    unsigned char* p = pv;
+    unsigned char* p = reinterpret_cast<unsigned char*>(pv);
     return (int)(((unsigned int)p[3] << 24) |
                  ((unsigned int)p[2] << 16) |
                  ((unsigned int)p[1] << 8) |
@@ -53,7 +53,7 @@ int Read4(void* pv) {
 }
 
 long long Read8(void* pv) {
-    unsigned char* p = pv;
+    unsigned char* p = reinterpret_cast<unsigned char*>(pv);
     return (long long)(((unsigned long long)p[7] << 56) |
                        ((unsigned long long)p[6] << 48) |
                        ((unsigned long long)p[5] << 40) |
diff --git a/minzip/Hash.h b/minzip/Hash.h
index 8194537f..e83eac41 100644
--- a/minzip/Hash.h
+++ b/minzip/Hash.h
@@ -15,6 +15,10 @@
 #include <stdbool.h>
 #include <assert.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* compute the hash of an item with a specific type */
 typedef unsigned int (*HashCompute)(const void* item);
 
@@ -183,4 +187,8 @@ typedef unsigned int (*HashCalcFunc)(const void* item);
 void mzHashTableProbeCount(HashTable* pHashTable, HashCalcFunc calcFunc,
     HashCompareFunc cmpFunc);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /*_MINZIP_HASH*/
diff --git a/roots.cpp b/roots.cpp
index 2bd457ef..9288177e 100644
--- a/roots.cpp
+++ b/roots.cpp
@@ -30,10 +30,8 @@
 #include "roots.h"
 #include "common.h"
 #include "make_ext4fs.h"
-extern "C" {
 #include "wipe.h"
 #include "cryptfs.h"
-}
 
 static struct fstab *fstab = NULL;
 
diff --git a/updater/Android.mk b/updater/Android.mk
index a0ea06fa..0d4179b2 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -1,11 +1,23 @@
 # Copyright 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.
 
 LOCAL_PATH := $(call my-dir)
 
 updater_src_files := \
-	install.c \
-	blockimg.c \
-	updater.c
+	install.cpp \
+	blockimg.cpp \
+	updater.cpp
 
 #
 # Build a statically-linked binary to include in OTA packages
diff --git a/updater/blockimg.c b/updater/blockimg.cpp
similarity index 98%
rename from updater/blockimg.c
rename to updater/blockimg.cpp
index a6a38950..258d9755 100644
--- a/updater/blockimg.c
+++ b/updater/blockimg.cpp
@@ -19,6 +19,7 @@
 #include <dirent.h>
 #include <fcntl.h>
 #include <inttypes.h>
+#include <linux/fs.h>
 #include <pthread.h>
 #include <stdarg.h>
 #include <stdio.h>
@@ -44,10 +45,6 @@
 // erase to mean fill the region with zeroes.
 #define DEBUG_ERASE  0
 
-#ifndef BLKDISCARD
-#define BLKDISCARD _IO(0x12,119)
-#endif
-
 #define STASH_DIRECTORY_BASE "/cache/recovery"
 #define STASH_DIRECTORY_MODE 0700
 #define STASH_FILE_MODE 0600
@@ -66,7 +63,7 @@ typedef struct {
 static RangeSet* parse_range(char* text) {
     char* save;
     char* token;
-    int i, num;
+    int num;
     long int val;
     RangeSet* out = NULL;
     size_t bufsize;
@@ -92,7 +89,7 @@ static RangeSet* parse_range(char* text) {
     num = (int) val;
     bufsize = sizeof(RangeSet) + num * sizeof(int);
 
-    out = malloc(bufsize);
+    out = reinterpret_cast<RangeSet*>(malloc(bufsize));
 
     if (!out) {
         fprintf(stderr, "failed to allocate range of %zu bytes\n", bufsize);
@@ -102,7 +99,7 @@ static RangeSet* parse_range(char* text) {
     out->count = num / 2;
     out->size = 0;
 
-    for (i = 0; i < num; ++i) {
+    for (int i = 0; i < num; ++i) {
         token = strtok_r(NULL, ",", &save);
 
         if (!token) {
@@ -477,7 +474,7 @@ static char* GetStashFileName(const char* base, const char* id, const char* post
     }
 
     len = strlen(STASH_DIRECTORY_BASE) + 1 + strlen(base) + 1 + strlen(id) + strlen(postfix) + 1;
-    fn = malloc(len);
+    fn = reinterpret_cast<char*>(malloc(len));
 
     if (fn == NULL) {
         fprintf(stderr, "failed to malloc %d bytes for fn\n", len);
@@ -528,7 +525,7 @@ static void EnumerateStash(const char* dirname, StashCallback callback, void* da
         }
 
         len = strlen(dirname) + 1 + strlen(item->d_name) + 1;
-        fn = malloc(len);
+        fn = reinterpret_cast<char*>(malloc(len));
 
         if (fn == NULL) {
             fprintf(stderr, "failed to malloc %d bytes for fn\n", len);
@@ -648,7 +645,8 @@ static int LoadStash(const char* base, const char* id, int verify, int* blocks,
     fprintf(stderr, " loading %s\n", fn);
 
     if ((st.st_size % BLOCKSIZE) != 0) {
-        fprintf(stderr, "%s size %zd not multiple of block size %d", fn, st.st_size, BLOCKSIZE);
+        fprintf(stderr, "%s size %" PRId64 " not multiple of block size %d",
+                fn, static_cast<int64_t>(st.st_size), BLOCKSIZE);
         goto lsout;
     }
 
@@ -856,7 +854,6 @@ csout:
 static int SaveStash(const char* base, char** wordsave, uint8_t** buffer, size_t* buffer_alloc,
                       int fd, int usehash, int* isunresumable) {
     char *id = NULL;
-    int res = -1;
     int blocks = 0;
 
     if (!wordsave || !buffer || !buffer_alloc || !isunresumable) {
@@ -952,7 +949,6 @@ static int LoadSrcTgtVersion2(char** wordsave, RangeSet** tgt, int* src_blocks,
     char* word;
     char* colonsave;
     char* colon;
-    int id;
     int res;
     RangeSet* locs;
     size_t stashalloc = 0;
@@ -1068,7 +1064,6 @@ static int LoadSrcTgtVersion3(CommandParameters* params, RangeSet** tgt, int* sr
     char* srchash = NULL;
     char* tgthash = NULL;
     int stash_exists = 0;
-    int overlap_blocks = 0;
     int rc = -1;
     uint8_t* tgtbuffer = NULL;
 
@@ -1491,7 +1486,7 @@ static int PerformCommandErase(CommandParameters* params) {
     range = strtok_r(NULL, " ", &params->cpos);
 
     if (range == NULL) {
-        fprintf(stderr, "missing target blocks for zero\n");
+        fprintf(stderr, "missing target blocks for erase\n");
         goto pceout;
     }
 
@@ -1666,7 +1661,7 @@ static Value* PerformBlockImageUpdate(const char* name, State* state, int argc,
 
     // The data in transfer_list_value is not necessarily null-terminated, so we need
     // to copy it to a new buffer and add the null that strtok_r will need.
-    transfer_list = malloc(transfer_list_value->size + 1);
+    transfer_list = reinterpret_cast<char*>(malloc(transfer_list_value->size + 1));
 
     if (transfer_list == NULL) {
         fprintf(stderr, "failed to allocate %zd bytes for transfer list\n",
@@ -1944,13 +1939,15 @@ Value* RangeSha1Fn(const char* name, State* state, int argc, Expr* argv[]) {
         goto done;
     }
 
-    int fd = open(blockdev_filename->data, O_RDWR);
+    int fd;
+    fd = open(blockdev_filename->data, O_RDWR);
     if (fd < 0) {
         ErrorAbort(state, "open \"%s\" failed: %s", blockdev_filename->data, strerror(errno));
         goto done;
     }
 
-    RangeSet* rs = parse_range(ranges->data);
+    RangeSet* rs;
+    rs = parse_range(ranges->data);
     uint8_t buffer[BLOCKSIZE];
 
     SHA_CTX ctx;
diff --git a/updater/install.c b/updater/install.cpp
similarity index 92%
rename from updater/install.c
rename to updater/install.cpp
index 4a0e064c..422a1bb1 100644
--- a/updater/install.c
+++ b/updater/install.cpp
@@ -80,9 +80,9 @@ void uiPrintf(State* state, const char* format, ...) {
 
 // Take a sha-1 digest and return it as a newly-allocated hex string.
 char* PrintSha1(const uint8_t* digest) {
-    char* buffer = malloc(SHA_DIGEST_SIZE*2 + 1);
-    int i;
+    char* buffer = reinterpret_cast<char*>(malloc(SHA_DIGEST_SIZE*2 + 1));
     const char* alphabet = "0123456789abcdef";
+    size_t i;
     for (i = 0; i < SHA_DIGEST_SIZE; ++i) {
         buffer[i*2] = alphabet[(digest[i] >> 4) & 0xf];
         buffer[i*2+1] = alphabet[digest[i] & 0xf];
@@ -138,18 +138,20 @@ Value* MountFn(const char* name, State* state, int argc, Expr* argv[]) {
         goto done;
     }
 
-    char *secontext = NULL;
+    {
+        char *secontext = NULL;
 
-    if (sehandle) {
-        selabel_lookup(sehandle, &secontext, mount_point, 0755);
-        setfscreatecon(secontext);
-    }
+        if (sehandle) {
+            selabel_lookup(sehandle, &secontext, mount_point, 0755);
+            setfscreatecon(secontext);
+        }
 
-    mkdir(mount_point, 0755);
+        mkdir(mount_point, 0755);
 
-    if (secontext) {
-        freecon(secontext);
-        setfscreatecon(NULL);
+        if (secontext) {
+            freecon(secontext);
+            setfscreatecon(NULL);
+        }
     }
 
     if (strcmp(partition_type, "MTD") == 0) {
@@ -207,11 +209,13 @@ Value* IsMountedFn(const char* name, State* state, int argc, Expr* argv[]) {
     }
 
     scan_mounted_volumes();
-    const MountedVolume* vol = find_mounted_volume_by_mount_point(mount_point);
-    if (vol == NULL) {
-        result = strdup("");
-    } else {
-        result = mount_point;
+    {
+        const MountedVolume* vol = find_mounted_volume_by_mount_point(mount_point);
+        if (vol == NULL) {
+            result = strdup("");
+        } else {
+            result = mount_point;
+        }
     }
 
 done:
@@ -235,17 +239,19 @@ Value* UnmountFn(const char* name, State* state, int argc, Expr* argv[]) {
     }
 
     scan_mounted_volumes();
-    const MountedVolume* vol = find_mounted_volume_by_mount_point(mount_point);
-    if (vol == NULL) {
-        uiPrintf(state, "unmount of %s failed; no such volume\n", mount_point);
-        result = strdup("");
-    } else {
-        int ret = unmount_mounted_volume(vol);
-        if (ret != 0) {
-           uiPrintf(state, "unmount of %s failed (%d): %s\n",
-                    mount_point, ret, strerror(errno));
+    {
+        const MountedVolume* vol = find_mounted_volume_by_mount_point(mount_point);
+        if (vol == NULL) {
+            uiPrintf(state, "unmount of %s failed; no such volume\n", mount_point);
+            result = strdup("");
+        } else {
+            int ret = unmount_mounted_volume(vol);
+            if (ret != 0) {
+                uiPrintf(state, "unmount of %s failed (%d): %s\n",
+                         mount_point, ret, strerror(errno));
+            }
+            result = mount_point;
         }
-        result = mount_point;
     }
 
 done:
@@ -418,9 +424,8 @@ done:
 }
 
 Value* DeleteFn(const char* name, State* state, int argc, Expr* argv[]) {
-    char** paths = malloc(argc * sizeof(char*));
-    int i;
-    for (i = 0; i < argc; ++i) {
+    char** paths = reinterpret_cast<char**>(malloc(argc * sizeof(char*)));
+    for (int i = 0; i < argc; ++i) {
         paths[i] = Evaluate(state, argv[i]);
         if (paths[i] == NULL) {
             int j;
@@ -435,7 +440,7 @@ Value* DeleteFn(const char* name, State* state, int argc, Expr* argv[]) {
     bool recursive = (strcmp(name, "delete_recursive") == 0);
 
     int success = 0;
-    for (i = 0; i < argc; ++i) {
+    for (int i = 0; i < argc; ++i) {
         if ((recursive ? dirUnlinkHierarchy(paths[i]) : unlink(paths[i])) == 0)
             ++success;
         free(paths[i]);
@@ -522,8 +527,6 @@ Value* PackageExtractFileFn(const char* name, State* state,
     }
     bool success = false;
 
-    UpdaterInfo* ui = (UpdaterInfo*)(state->cookie);
-
     if (argc == 2) {
         // The two-argument version extracts to a file.
 
@@ -539,14 +542,16 @@ Value* PackageExtractFileFn(const char* name, State* state,
             goto done2;
         }
 
-        FILE* f = fopen(dest_path, "wb");
-        if (f == NULL) {
-            printf("%s: can't open %s for write: %s\n",
-                    name, dest_path, strerror(errno));
-            goto done2;
+        {
+            FILE* f = fopen(dest_path, "wb");
+            if (f == NULL) {
+                printf("%s: can't open %s for write: %s\n",
+                        name, dest_path, strerror(errno));
+                goto done2;
+            }
+            success = mzExtractZipEntryToFile(za, entry, fileno(f));
+            fclose(f);
         }
-        success = mzExtractZipEntryToFile(za, entry, fileno(f));
-        fclose(f);
 
       done2:
         free(zip_path);
@@ -557,7 +562,7 @@ Value* PackageExtractFileFn(const char* name, State* state,
         // as the result.
 
         char* zip_path;
-        Value* v = malloc(sizeof(Value));
+        Value* v = reinterpret_cast<Value*>(malloc(sizeof(Value)));
         v->type = VAL_BLOB;
         v->size = -1;
         v->data = NULL;
@@ -572,7 +577,7 @@ Value* PackageExtractFileFn(const char* name, State* state,
         }
 
         v->size = mzGetZipEntryUncompLen(entry);
-        v->data = malloc(v->size);
+        v->data = reinterpret_cast<char*>(malloc(v->size));
         if (v->data == NULL) {
             printf("%s: failed to allocate %ld bytes for %s\n",
                     name, (long)v->size, zip_path);
@@ -871,17 +876,14 @@ static int do_SetMetadataRecursive(const char* filename, const struct stat *stat
 }
 
 static Value* SetMetadataFn(const char* name, State* state, int argc, Expr* argv[]) {
-    int i;
     int bad = 0;
-    static int nwarnings = 0;
     struct stat sb;
     Value* result = NULL;
 
     bool recursive = (strcmp(name, "set_metadata_recursive") == 0);
 
     if ((argc % 2) != 1) {
-        return ErrorAbort(state, "%s() expects an odd number of arguments, got %d",
-                          name, argc);
+        return ErrorAbort(state, "%s() expects an odd number of arguments, got %d", name, argc);
     }
 
     char** args = ReadVarArgs(state, argc, argv);
@@ -892,20 +894,22 @@ static Value* SetMetadataFn(const char* name, State* state, int argc, Expr* argv
         goto done;
     }
 
-    struct perm_parsed_args parsed = ParsePermArgs(state, argc, args);
+    {
+        struct perm_parsed_args parsed = ParsePermArgs(state, argc, args);
 
-    if (recursive) {
-        recursive_parsed_args = parsed;
-        recursive_state = state;
-        bad += nftw(args[0], do_SetMetadataRecursive, 30, FTW_CHDIR | FTW_DEPTH | FTW_PHYS);
-        memset(&recursive_parsed_args, 0, sizeof(recursive_parsed_args));
-        recursive_state = NULL;
-    } else {
-        bad += ApplyParsedPerms(state, args[0], &sb, parsed);
+        if (recursive) {
+            recursive_parsed_args = parsed;
+            recursive_state = state;
+            bad += nftw(args[0], do_SetMetadataRecursive, 30, FTW_CHDIR | FTW_DEPTH | FTW_PHYS);
+            memset(&recursive_parsed_args, 0, sizeof(recursive_parsed_args));
+            recursive_state = NULL;
+        } else {
+            bad += ApplyParsedPerms(state, args[0], &sb, parsed);
+        }
     }
 
 done:
-    for (i = 0; i < argc; ++i) {
+    for (int i = 0; i < argc; ++i) {
         free(args[i]);
     }
     free(args);
@@ -925,8 +929,7 @@ Value* GetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
     if (argc != 1) {
         return ErrorAbort(state, "%s() expects 1 arg, got %d", name, argc);
     }
-    char* key;
-    key = Evaluate(state, argv[0]);
+    char* key = Evaluate(state, argv[0]);
     if (key == NULL) return NULL;
 
     char value[PROPERTY_VALUE_MAX];
@@ -953,29 +956,27 @@ Value* FileGetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
 
     struct stat st;
     if (stat(filename, &st) < 0) {
-        ErrorAbort(state, "%s: failed to stat \"%s\": %s",
-                   name, filename, strerror(errno));
+        ErrorAbort(state, "%s: failed to stat \"%s\": %s", name, filename, strerror(errno));
         goto done;
     }
 
 #define MAX_FILE_GETPROP_SIZE    65536
 
     if (st.st_size > MAX_FILE_GETPROP_SIZE) {
-        ErrorAbort(state, "%s too large for %s (max %d)",
-                   filename, name, MAX_FILE_GETPROP_SIZE);
+        ErrorAbort(state, "%s too large for %s (max %d)", filename, name, MAX_FILE_GETPROP_SIZE);
         goto done;
     }
 
-    buffer = malloc(st.st_size+1);
+    buffer = reinterpret_cast<char*>(malloc(st.st_size+1));
     if (buffer == NULL) {
         ErrorAbort(state, "%s: failed to alloc %lld bytes", name, (long long)st.st_size+1);
         goto done;
     }
 
-    FILE* f = fopen(filename, "rb");
+    FILE* f;
+    f = fopen(filename, "rb");
     if (f == NULL) {
-        ErrorAbort(state, "%s: failed to open %s: %s",
-                   name, filename, strerror(errno));
+        ErrorAbort(state, "%s: failed to open %s: %s", name, filename, strerror(errno));
         goto done;
     }
 
@@ -989,7 +990,8 @@ Value* FileGetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
 
     fclose(f);
 
-    char* line = strtok(buffer, "\n");
+    char* line;
+    line = strtok(buffer, "\n");
     do {
         // skip whitespace at start of line
         while (*line && isspace(*line)) ++line;
@@ -1033,15 +1035,6 @@ Value* FileGetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
     return StringValue(result);
 }
 
-
-static bool write_raw_image_cb(const unsigned char* data,
-                               int data_len, void* ctx) {
-    int r = mtd_write_data((MtdWriteContext*)ctx, (const char *)data, data_len);
-    if (r == data_len) return true;
-    printf("%s\n", strerror(errno));
-    return false;
-}
-
 // write_raw_image(filename_or_blob, partition)
 Value* WriteRawImageFn(const char* name, State* state, int argc, Expr* argv[]) {
     char* result = NULL;
@@ -1068,14 +1061,16 @@ Value* WriteRawImageFn(const char* name, State* state, int argc, Expr* argv[]) {
     }
 
     mtd_scan_partitions();
-    const MtdPartition* mtd = mtd_find_partition_by_name(partition);
+    const MtdPartition* mtd;
+    mtd = mtd_find_partition_by_name(partition);
     if (mtd == NULL) {
         printf("%s: no mtd partition named \"%s\"\n", name, partition);
         result = strdup("");
         goto done;
     }
 
-    MtdWriteContext* ctx = mtd_write_partition(mtd);
+    MtdWriteContext* ctx;
+    ctx = mtd_write_partition(mtd);
     if (ctx == NULL) {
         printf("%s: can't write mtd partition \"%s\"\n",
                 name, partition);
@@ -1090,14 +1085,13 @@ Value* WriteRawImageFn(const char* name, State* state, int argc, Expr* argv[]) {
         char* filename = contents->data;
         FILE* f = fopen(filename, "rb");
         if (f == NULL) {
-            printf("%s: can't open %s: %s\n",
-                    name, filename, strerror(errno));
+            printf("%s: can't open %s: %s\n", name, filename, strerror(errno));
             result = strdup("");
             goto done;
         }
 
         success = true;
-        char* buffer = malloc(BUFSIZ);
+        char* buffer = reinterpret_cast<char*>(malloc(BUFSIZ));
         int read;
         while (success && (read = fread(buffer, 1, BUFSIZ, f)) > 0) {
             int wrote = mtd_write_data(ctx, buffer, read);
@@ -1144,8 +1138,7 @@ Value* ApplyPatchSpaceFn(const char* name, State* state,
     char* endptr;
     size_t bytes = strtol(bytes_str, &endptr, 10);
     if (bytes == 0 && endptr == bytes_str) {
-        ErrorAbort(state, "%s(): can't parse \"%s\" as byte count\n\n",
-                   name, bytes_str);
+        ErrorAbort(state, "%s(): can't parse \"%s\" as byte count\n\n", name, bytes_str);
         free(bytes_str);
         return NULL;
     }
@@ -1205,7 +1198,7 @@ Value* ApplyPatchFn(const char* name, State* state, int argc, Expr* argv[]) {
         return NULL;
     }
 
-    char** patch_sha_str = malloc(patchcount * sizeof(char*));
+    char** patch_sha_str = reinterpret_cast<char**>(malloc(patchcount * sizeof(char*)));
     for (i = 0; i < patchcount; ++i) {
         patch_sha_str[i] = patches[i*2]->data;
         patches[i*2]->data = NULL;
@@ -1264,7 +1257,7 @@ Value* UIPrintFn(const char* name, State* state, int argc, Expr* argv[]) {
     for (i = 0; i < argc; ++i) {
         size += strlen(args[i]);
     }
-    char* buffer = malloc(size+1);
+    char* buffer = reinterpret_cast<char*>(malloc(size+1));
     size = 0;
     for (i = 0; i < argc; ++i) {
         strcpy(buffer+size, args[i]);
@@ -1294,7 +1287,7 @@ Value* RunProgramFn(const char* name, State* state, int argc, Expr* argv[]) {
         return NULL;
     }
 
-    char** args2 = malloc(sizeof(char*) * (argc+1));
+    char** args2 = reinterpret_cast<char**>(malloc(sizeof(char*) * (argc+1)));
     memcpy(args2, args, sizeof(char*) * argc);
     args2[argc] = NULL;
 
@@ -1361,7 +1354,7 @@ Value* Sha1CheckFn(const char* name, State* state, int argc, Expr* argv[]) {
     }
 
     int i;
-    uint8_t* arg_digest = malloc(SHA_DIGEST_SIZE);
+    uint8_t* arg_digest = reinterpret_cast<uint8_t*>(malloc(SHA_DIGEST_SIZE));
     for (i = 1; i < argc; ++i) {
         if (args[i]->type != VAL_STRING) {
             printf("%s(): arg %d is not a string; skipping",
@@ -1397,7 +1390,7 @@ Value* ReadFileFn(const char* name, State* state, int argc, Expr* argv[]) {
     char* filename;
     if (ReadArgs(state, argv, 1, &filename) < 0) return NULL;
 
-    Value* v = malloc(sizeof(Value));
+    Value* v = reinterpret_cast<Value*>(malloc(sizeof(Value)));
     v->type = VAL_BLOB;
 
     FileContents fc;
@@ -1555,15 +1548,14 @@ Value* Tune2FsFn(const char* name, State* state, int argc, Expr* argv[]) {
         return ErrorAbort(state, "%s() could not read args", name);
     }
 
-    int i;
-    char** args2 = malloc(sizeof(char*) * (argc+1));
+    char** args2 = reinterpret_cast<char**>(malloc(sizeof(char*) * (argc+1)));
     // Tune2fs expects the program name as its args[0]
     args2[0] = strdup(name);
-    for (i = 0; i < argc; ++i) {
+    for (int i = 0; i < argc; ++i) {
        args2[i + 1] = args[i];
     }
     int result = tune2fs_main(argc + 1, args2);
-    for (i = 0; i < argc; ++i) {
+    for (int i = 0; i < argc; ++i) {
         free(args[i]);
     }
     free(args);
diff --git a/updater/updater.c b/updater/updater.cpp
similarity index 98%
rename from updater/updater.c
rename to updater/updater.cpp
index 661f6958..0f22e6d0 100644
--- a/updater/updater.c
+++ b/updater/updater.cpp
@@ -89,7 +89,7 @@ int main(int argc, char** argv) {
         return 4;
     }
 
-    char* script = malloc(script_entry->uncompLen+1);
+    char* script = reinterpret_cast<char*>(malloc(script_entry->uncompLen+1));
     if (!mzReadZipEntry(&za, script_entry, script, script_entry->uncompLen)) {
         printf("failed to read script from package\n");
         return 5;