diff --git a/applypatch/Android.mk b/applypatch/Android.mk
index eb3e458..1f73fd8 100644
--- a/applypatch/Android.mk
+++ b/applypatch/Android.mk
@@ -17,7 +17,7 @@
 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 $(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 $(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 $(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 88%
rename from applypatch/applypatch.c
rename to applypatch/applypatch.cpp
index 2358d42..96bd88e 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 @@
     }
 
     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 @@
         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 @@
 // 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 @@
     } 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 @@
     }
 
     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 @@
     FILE* dev = NULL;
 
     switch (type) {
-        case MTD:
+        case MTD: {
             if (!mtd_partitions_scanned) {
                 mtd_scan_partitions();
                 mtd_partitions_scanned = 1;
@@ -195,6 +192,7 @@
                 return -1;
             }
             break;
+        }
 
         case EMMC:
             dev = fopen(partition, "rb");
@@ -210,7 +208,7 @@
     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 @@
         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 @@
     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 @@
 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 @@
 // 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 @@
     }
 
     switch (type) {
-        case MTD:
+        case MTD: {
             if (!mtd_partitions_scanned) {
                 mtd_scan_partitions();
                 mtd_partitions_scanned = 1;
@@ -378,22 +371,19 @@
 
             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 @@
                 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 @@
                     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 @@
                 }
                 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 @@
                                    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 @@
 // 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 @@
 // 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 @@
 // 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 @@
 }
 
 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 @@
 } 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 @@
 }
 
 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 @@
                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 @@
     }
 
     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 @@
             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 @@
                     (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 @@
                     // 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 @@
                 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 @@
         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 @@
             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 @@
             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 86%
rename from applypatch/bsdiff.c
rename to applypatch/bsdiff.cpp
index b6d342b..55dbe5c 100644
--- a/applypatch/bsdiff.c
+++ b/applypatch/bsdiff.cpp
@@ -156,24 +156,24 @@
 	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 @@
 	};
 
 	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 @@
 
 // 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 @@
 //      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 @@
 
         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 @@
 		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 @@
 			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 @@
 				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 @@
 			};
 
 			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 97%
rename from applypatch/bspatch.c
rename to applypatch/bspatch.cpp
index b57760e..9d201b4 100644
--- a/applypatch/bspatch.c
+++ b/applypatch/bspatch.cpp
@@ -182,10 +182,9 @@
         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 79%
rename from applypatch/freecache.c
rename to applypatch/freecache.cpp
index 9827fda..2eb2f55 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 @@
   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 @@
   // 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 @@
       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 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 @@
     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 91%
rename from applypatch/imgdiff.c
rename to applypatch/imgdiff.cpp
index 3bac8be..4d83ffb 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 @@
 }
 
 // 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 @@
     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 @@
   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 @@
     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 @@
 #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 @@
       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 @@
     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 @@
   // 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 @@
       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 @@
 
       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 @@
       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 @@
         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 @@
       // 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 @@
       // 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 @@
       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 @@
   }
 
   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 @@
     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 @@
     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 @@
 }
 
 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 @@
       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 @@
   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 @@
       }
     } 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 @@
 
     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 @@
         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 @@
         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 09b0a73..26888f8 100644
--- a/applypatch/imgpatch.c
+++ b/applypatch/imgpatch.cpp
@@ -132,7 +132,7 @@
             // 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 @@
                 // ... 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 8e9fe80..63ff5c2 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 @@
 
 // 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 @@
 
         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 @@
             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 @@
     }
     free(*sha1s);
     free(*patches);
-    return -1;
+    return false;
 }
 
 int PatchMode(int argc, char** argv) {
@@ -107,7 +106,7 @@
             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 @@
     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 41ff676..4a80be7 100644
--- a/applypatch/utils.c
+++ b/applypatch/utils.cpp
@@ -39,13 +39,13 @@
 }
 
 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 @@
 }
 
 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) |