Revert "fastboot: create Transport object."

This broke some stuff, will look into it Monday.

This reverts commit 6f233a7799a681e65c539e9c8287db0814c8948f.

Change-Id: I155bc85d21fda3b0ba1e5e17839059797fb15509

11 files changed, 304 insertions, 357 deletions

diff --git a/fastboot/Android.mk b/fastboot/Android.mk
index 5ca88cb3e..7a7366eee 100644
--- a/fastboot/Android.mk
+++ b/fastboot/Android.mk
@@ -83,6 +83,5 @@ include $(CLEAR_VARS)
 LOCAL_SRC_FILES := usbtest.cpp usb_linux.cpp util.cpp
 LOCAL_MODULE := usbtest
 LOCAL_CFLAGS := -Werror
-LOCAL_STATIC_LIBRARIES := libbase
 include $(BUILD_HOST_EXECUTABLE)
 endif
diff --git a/fastboot/engine.cpp b/fastboot/engine.cpp
index ac5a17a06..d4be63b73 100644
--- a/fastboot/engine.cpp
+++ b/fastboot/engine.cpp
@@ -75,13 +75,13 @@ static Action *action_last = 0;
 
 
 
-bool fb_getvar(Transport* transport, const std::string& key, std::string* value) {
+bool fb_getvar(usb_handle* usb, const std::string& key, std::string* value) {
     std::string cmd = "getvar:";
     cmd += key;
 
     char buf[FB_RESPONSE_SZ + 1];
     memset(buf, 0, sizeof(buf));
-    if (fb_command_response(transport, cmd.c_str(), buf)) {
+    if (fb_command_response(usb, cmd.c_str(), buf)) {
       return false;
     }
     *value = buf;
@@ -330,7 +330,7 @@ void fb_queue_wait_for_disconnect(void)
     queue_action(OP_WAIT_FOR_DISCONNECT, "");
 }
 
-int fb_execute_queue(Transport* transport)
+int fb_execute_queue(usb_handle *usb)
 {
     Action *a;
     char resp[FB_RESPONSE_SZ+1];
@@ -350,25 +350,25 @@ int fb_execute_queue(Transport* transport)
             fprintf(stderr,"%s...\n",a->msg);
         }
         if (a->op == OP_DOWNLOAD) {
-            status = fb_download_data(transport, a->data, a->size);
+            status = fb_download_data(usb, a->data, a->size);
             status = a->func(a, status, status ? fb_get_error() : "");
             if (status) break;
         } else if (a->op == OP_COMMAND) {
-            status = fb_command(transport, a->cmd);
+            status = fb_command(usb, a->cmd);
             status = a->func(a, status, status ? fb_get_error() : "");
             if (status) break;
         } else if (a->op == OP_QUERY) {
-            status = fb_command_response(transport, a->cmd, resp);
+            status = fb_command_response(usb, a->cmd, resp);
             status = a->func(a, status, status ? fb_get_error() : resp);
             if (status) break;
         } else if (a->op == OP_NOTICE) {
             fprintf(stderr,"%s\n",(char*)a->data);
         } else if (a->op == OP_DOWNLOAD_SPARSE) {
-            status = fb_download_data_sparse(transport, reinterpret_cast<sparse_file*>(a->data));
+            status = fb_download_data_sparse(usb, reinterpret_cast<sparse_file*>(a->data));
             status = a->func(a, status, status ? fb_get_error() : "");
             if (status) break;
         } else if (a->op == OP_WAIT_FOR_DISCONNECT) {
-            transport->WaitForDisconnect();
+            usb_wait_for_disconnect(usb);
         } else {
             die("bogus action");
         }
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index e3aeb912e..3ab8f94fa 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -55,8 +55,6 @@
 #include "bootimg_utils.h"
 #include "fastboot.h"
 #include "fs.h"
-#include "transport.h"
-#include "usb.h"
 
 #ifndef O_BINARY
 #define O_BINARY 0
@@ -224,16 +222,16 @@ static int list_devices_callback(usb_ifc_info* info) {
     return -1;
 }
 
-static Transport* open_device() {
-    static Transport* transport = nullptr;
+static usb_handle* open_device() {
+    static usb_handle *usb = 0;
     int announce = 1;
 
-    if (transport) return transport;
+    if(usb) return usb;
 
-    for (;;) {
-        transport = usb_open(match_fastboot);
-        if (transport) return transport;
-        if (announce) {
+    for(;;) {
+        usb = usb_open(match_fastboot);
+        if(usb) return usb;
+        if(announce) {
             announce = 0;
             fprintf(stderr, "< waiting for %s >\n", serial ? serial : "any device");
         }
@@ -599,10 +597,9 @@ static struct sparse_file **load_sparse_files(int fd, int max_size)
     return out_s;
 }
 
-static int64_t get_target_sparse_limit(Transport* transport) {
+static int64_t get_target_sparse_limit(usb_handle* usb) {
     std::string max_download_size;
-    if (!fb_getvar(transport, "max-download-size", &max_download_size) ||
-            max_download_size.empty()) {
+    if (!fb_getvar(usb, "max-download-size", &max_download_size) || max_download_size.empty()) {
         fprintf(stderr, "target didn't report max-download-size\n");
         return 0;
     }
@@ -621,7 +618,7 @@ static int64_t get_target_sparse_limit(Transport* transport) {
     return limit;
 }
 
-static int64_t get_sparse_limit(Transport* transport, int64_t size) {
+static int64_t get_sparse_limit(usb_handle* usb, int64_t size) {
     int64_t limit;
 
     if (sparse_limit == 0) {
@@ -630,7 +627,7 @@ static int64_t get_sparse_limit(Transport* transport, int64_t size) {
         limit = sparse_limit;
     } else {
         if (target_sparse_limit == -1) {
-            target_sparse_limit = get_target_sparse_limit(transport);
+            target_sparse_limit = get_target_sparse_limit(usb);
         }
         if (target_sparse_limit > 0) {
             limit = target_sparse_limit;
@@ -649,22 +646,22 @@ static int64_t get_sparse_limit(Transport* transport, int64_t size) {
 // Until we get lazy inode table init working in make_ext4fs, we need to
 // erase partitions of type ext4 before flashing a filesystem so no stale
 // inodes are left lying around.  Otherwise, e2fsck gets very upset.
-static bool needs_erase(Transport* transport, const char* partition) {
+static bool needs_erase(usb_handle* usb, const char* partition) {
     std::string partition_type;
-    if (!fb_getvar(transport, std::string("partition-type:") + partition, &partition_type)) {
+    if (!fb_getvar(usb, std::string("partition-type:") + partition, &partition_type)) {
         return false;
     }
     return partition_type == "ext4";
 }
 
-static int load_buf_fd(Transport* transport, int fd, struct fastboot_buffer* buf) {
+static int load_buf_fd(usb_handle* usb, int fd, struct fastboot_buffer* buf) {
     int64_t sz = get_file_size(fd);
     if (sz == -1) {
         return -1;
     }
 
     lseek64(fd, 0, SEEK_SET);
-    int64_t limit = get_sparse_limit(transport, sz);
+    int64_t limit = get_sparse_limit(usb, sz);
     if (limit) {
         sparse_file** s = load_sparse_files(fd, limit);
         if (s == nullptr) {
@@ -683,7 +680,8 @@ static int load_buf_fd(Transport* transport, int fd, struct fastboot_buffer* buf
     return 0;
 }
 
-static int load_buf(Transport* transport, const char *fname, struct fastboot_buffer *buf)
+static int load_buf(usb_handle *usb, const char *fname,
+        struct fastboot_buffer *buf)
 {
     int fd;
 
@@ -692,7 +690,7 @@ static int load_buf(Transport* transport, const char *fname, struct fastboot_buf
         return -1;
     }
 
-    return load_buf_fd(transport, fd, buf);
+    return load_buf_fd(usb, fd, buf);
 }
 
 static void flash_buf(const char *pname, struct fastboot_buffer *buf)
@@ -715,20 +713,20 @@ static void flash_buf(const char *pname, struct fastboot_buffer *buf)
     }
 }
 
-static std::vector<std::string> get_suffixes(Transport* transport) {
+static std::vector<std::string> get_suffixes(usb_handle* usb) {
     std::vector<std::string> suffixes;
     std::string suffix_list;
-    if (!fb_getvar(transport, "slot-suffixes", &suffix_list)) {
+    if (!fb_getvar(usb, "slot-suffixes", &suffix_list)) {
         die("Could not get suffixes.\n");
     }
     return android::base::Split(suffix_list, ",");
 }
 
-static std::string verify_slot(Transport* transport, const char *slot) {
+static std::string verify_slot(usb_handle* usb, const char *slot) {
     if (strcmp(slot, "all") == 0) {
         return "all";
     }
-    std::vector<std::string> suffixes = get_suffixes(transport);
+    std::vector<std::string> suffixes = get_suffixes(usb);
     for (const std::string &suffix : suffixes) {
         if (suffix == slot)
             return slot;
@@ -740,18 +738,17 @@ static std::string verify_slot(Transport* transport, const char *slot) {
     exit(1);
 }
 
-static void do_for_partition(Transport* transport, const char *part, const char *slot,
-                             std::function<void(const std::string&)> func, bool force_slot) {
+static void do_for_partition(usb_handle* usb, const char *part, const char *slot, std::function<void(const std::string&)> func, bool force_slot) {
     std::string has_slot;
     std::string current_slot;
 
-    if (!fb_getvar(transport, std::string("has-slot:")+part, &has_slot)) {
+    if (!fb_getvar(usb, std::string("has-slot:")+part, &has_slot)) {
         /* If has-slot is not supported, the answer is no. */
         has_slot = "no";
     }
     if (has_slot == "yes") {
         if (!slot || slot[0] == 0) {
-            if (!fb_getvar(transport, "current-slot", &current_slot)) {
+            if (!fb_getvar(usb, "current-slot", &current_slot)) {
                 die("Failed to identify current slot.\n");
             }
             func(std::string(part) + '-' + current_slot);
@@ -760,43 +757,40 @@ static void do_for_partition(Transport* transport, const char *part, const char
         }
     } else {
         if (force_slot && slot && slot[0]) {
-             fprintf(stderr, "Warning: %s does not support slots, and slot %s was requested.\n",
-                     part, slot);
+             fprintf(stderr, "Warning: %s does not support slots, and slot %s was requested.\n", part, slot);
         }
         func(part);
     }
 }
 
-/* This function will find the real partition name given a base name, and a slot. If slot is NULL or
- * empty, it will use the current slot. If slot is "all", it will return a list of all possible
- * partition names. If force_slot is true, it will fail if a slot is specified, and the given
- * partition does not support slots.
+/* This function will find the real partition name given a base name, and a slot. If slot is NULL or empty,
+ * it will use the current slot. If slot is "all", it will return a list of all possible partition names.
+ * If force_slot is true, it will fail if a slot is specified, and the given partition does not support slots.
  */
-static void do_for_partitions(Transport* transport, const char *part, const char *slot,
-                              std::function<void(const std::string&)> func, bool force_slot) {
+static void do_for_partitions(usb_handle* usb, const char *part, const char *slot, std::function<void(const std::string&)> func, bool force_slot) {
     std::string has_slot;
 
     if (slot && strcmp(slot, "all") == 0) {
-        if (!fb_getvar(transport, std::string("has-slot:") + part, &has_slot)) {
+        if (!fb_getvar(usb, std::string("has-slot:") + part, &has_slot)) {
             die("Could not check if partition %s has slot.", part);
         }
         if (has_slot == "yes") {
-            std::vector<std::string> suffixes = get_suffixes(transport);
+            std::vector<std::string> suffixes = get_suffixes(usb);
             for (std::string &suffix : suffixes) {
-                do_for_partition(transport, part, suffix.c_str(), func, force_slot);
+                do_for_partition(usb, part, suffix.c_str(), func, force_slot);
             }
         } else {
-            do_for_partition(transport, part, "", func, force_slot);
+            do_for_partition(usb, part, "", func, force_slot);
         }
     } else {
-        do_for_partition(transport, part, slot, func, force_slot);
+        do_for_partition(usb, part, slot, func, force_slot);
     }
 }
 
-static void do_flash(Transport* transport, const char* pname, const char* fname) {
+static void do_flash(usb_handle* usb, const char* pname, const char* fname) {
     struct fastboot_buffer buf;
 
-    if (load_buf(transport, fname, &buf)) {
+    if (load_buf(usb, fname, &buf)) {
         die("cannot load '%s'", fname);
     }
     flash_buf(pname, &buf);
@@ -810,7 +804,7 @@ static void do_update_signature(ZipArchiveHandle zip, char* fn) {
     fb_queue_command("signature", "installing signature");
 }
 
-static void do_update(Transport* transport, const char* filename, const char* slot_override, bool erase_first) {
+static void do_update(usb_handle* usb, const char* filename, const char* slot_override, bool erase_first) {
     queue_info_dump();
 
     fb_queue_query_save("product", cur_product, sizeof(cur_product));
@@ -841,12 +835,12 @@ static void do_update(Transport* transport, const char* filename, const char* sl
             exit(1); // unzip_to_file already explained why.
         }
         fastboot_buffer buf;
-        int rc = load_buf_fd(transport, fd, &buf);
+        int rc = load_buf_fd(usb, fd, &buf);
         if (rc) die("cannot load %s from flash", images[i].img_name);
 
         auto update = [&](const std::string &partition) {
             do_update_signature(zip, images[i].sig_name);
-            if (erase_first && needs_erase(transport, partition.c_str())) {
+            if (erase_first && needs_erase(usb, partition.c_str())) {
                 fb_queue_erase(partition.c_str());
             }
             flash_buf(partition.c_str(), &buf);
@@ -855,7 +849,7 @@ static void do_update(Transport* transport, const char* filename, const char* sl
              * program exits.
              */
         };
-        do_for_partitions(transport, images[i].part_name, slot_override, update, false);
+        do_for_partitions(usb, images[i].part_name, slot_override, update, false);
     }
 
     CloseArchive(zip);
@@ -877,7 +871,7 @@ static void do_send_signature(char* fn) {
     fb_queue_command("signature", "installing signature");
 }
 
-static void do_flashall(Transport* transport, const char* slot_override, int erase_first) {
+static void do_flashall(usb_handle* usb, const char *slot_override, int erase_first) {
     queue_info_dump();
 
     fb_queue_query_save("product", cur_product, sizeof(cur_product));
@@ -894,7 +888,7 @@ static void do_flashall(Transport* transport, const char* slot_override, int era
     for (size_t i = 0; i < ARRAY_SIZE(images); i++) {
         fname = find_item(images[i].part_name, product);
         fastboot_buffer buf;
-        if (load_buf(transport, fname, &buf)) {
+        if (load_buf(usb, fname, &buf)) {
             if (images[i].is_optional)
                 continue;
             die("could not load %s\n", images[i].img_name);
@@ -902,12 +896,12 @@ static void do_flashall(Transport* transport, const char* slot_override, int era
 
         auto flashall = [&](const std::string &partition) {
             do_send_signature(fname);
-            if (erase_first && needs_erase(transport, partition.c_str())) {
+            if (erase_first && needs_erase(usb, partition.c_str())) {
                 fb_queue_erase(partition.c_str());
             }
             flash_buf(partition.c_str(), &buf);
         };
-        do_for_partitions(transport, images[i].part_name, slot_override, flashall, false);
+        do_for_partitions(usb, images[i].part_name, slot_override, flashall, false);
     }
 }
 
@@ -992,7 +986,7 @@ static int64_t parse_num(const char *arg)
     return num;
 }
 
-static void fb_perform_format(Transport* transport,
+static void fb_perform_format(usb_handle* usb,
                               const char* partition, int skip_if_not_supported,
                               const char* type_override, const char* size_override) {
     std::string partition_type, partition_size;
@@ -1010,7 +1004,7 @@ static void fb_perform_format(Transport* transport,
         limit = sparse_limit;
     }
 
-    if (!fb_getvar(transport, std::string("partition-type:") + partition, &partition_type)) {
+    if (!fb_getvar(usb, std::string("partition-type:") + partition, &partition_type)) {
         errMsg = "Can't determine partition type.\n";
         goto failed;
     }
@@ -1022,7 +1016,7 @@ static void fb_perform_format(Transport* transport,
         partition_type = type_override;
     }
 
-    if (!fb_getvar(transport, std::string("partition-size:") + partition, &partition_size)) {
+    if (!fb_getvar(usb, std::string("partition-size:") + partition, &partition_size)) {
         errMsg = "Unable to get partition size\n";
         goto failed;
     }
@@ -1064,7 +1058,7 @@ static void fb_perform_format(Transport* transport,
         return;
     }
 
-    if (load_buf_fd(transport, fd, &buf)) {
+    if (load_buf_fd(usb, fd, &buf)) {
         fprintf(stderr, "Cannot read image: %s\n", strerror(errno));
         close(fd);
         return;
@@ -1216,11 +1210,11 @@ int main(int argc, char **argv)
         return 0;
     }
 
-    Transport* transport = open_device();
+    usb_handle* usb = open_device();
     if (slot_override != "")
-        slot_override = verify_slot(transport, slot_override.c_str());
+        slot_override = verify_slot(usb, slot_override.c_str());
     if (next_active != "")
-        next_active = verify_slot(transport, next_active.c_str());
+        next_active = verify_slot(usb, next_active.c_str());
 
     if (wants_set_active) {
         if (next_active == "") {
@@ -1241,8 +1235,8 @@ int main(int argc, char **argv)
             require(2);
 
             auto erase = [&](const std::string &partition) {
-                std::string partition_type;
-                if (fb_getvar(transport, std::string("partition-type:") + argv[1], &partition_type) &&
+            std::string partition_type;
+                if (fb_getvar(usb, std::string("partition-type:") + argv[1], &partition_type) &&
                     fs_get_generator(partition_type) != nullptr) {
                     fprintf(stderr, "******** Did you mean to fastboot format this %s partition?\n",
                             partition_type.c_str());
@@ -1250,7 +1244,7 @@ int main(int argc, char **argv)
 
                 fb_queue_erase(partition.c_str());
             };
-            do_for_partitions(transport, argv[1], slot_override.c_str(), erase, true);
+            do_for_partitions(usb, argv[1], slot_override.c_str(), erase, true);
             skip(2);
         } else if(!strncmp(*argv, "format", strlen("format"))) {
             char *overrides;
@@ -1280,12 +1274,12 @@ int main(int argc, char **argv)
             if (size_override && !size_override[0]) size_override = nullptr;
 
             auto format = [&](const std::string &partition) {
-                if (erase_first && needs_erase(transport, partition.c_str())) {
+                if (erase_first && needs_erase(usb, partition.c_str())) {
                     fb_queue_erase(partition.c_str());
                 }
-                fb_perform_format(transport, partition.c_str(), 0, type_override, size_override);
+                fb_perform_format(usb, partition.c_str(), 0, type_override, size_override);
             };
-            do_for_partitions(transport, argv[1], slot_override.c_str(), format, true);
+            do_for_partitions(usb, argv[1], slot_override.c_str(), format, true);
             skip(2);
         } else if(!strcmp(*argv, "signature")) {
             require(2);
@@ -1347,12 +1341,12 @@ int main(int argc, char **argv)
             if (fname == 0) die("cannot determine image filename for '%s'", pname);
 
             auto flash = [&](const std::string &partition) {
-                if (erase_first && needs_erase(transport, partition.c_str())) {
+                if (erase_first && needs_erase(usb, partition.c_str())) {
                     fb_queue_erase(partition.c_str());
                 }
-                do_flash(transport, partition.c_str(), fname);
+                do_flash(usb, partition.c_str(), fname);
             };
-            do_for_partitions(transport, pname, slot_override.c_str(), flash, true);
+            do_for_partitions(usb, pname, slot_override.c_str(), flash, true);
         } else if(!strcmp(*argv, "flash:raw")) {
             char *kname = argv[2];
             char *rname = 0;
@@ -1372,17 +1366,17 @@ int main(int argc, char **argv)
             auto flashraw = [&](const std::string &partition) {
                 fb_queue_flash(partition.c_str(), data, sz);
             };
-            do_for_partitions(transport, argv[1], slot_override.c_str(), flashraw, true);
+            do_for_partitions(usb, argv[1], slot_override.c_str(), flashraw, true);
         } else if(!strcmp(*argv, "flashall")) {
             skip(1);
-            do_flashall(transport, slot_override.c_str(), erase_first);
+            do_flashall(usb, slot_override.c_str(), erase_first);
             wants_reboot = true;
         } else if(!strcmp(*argv, "update")) {
             if (argc > 1) {
-                do_update(transport, argv[1], slot_override.c_str(), erase_first);
+                do_update(usb, argv[1], slot_override.c_str(), erase_first);
                 skip(2);
             } else {
-                do_update(transport, "update.zip", slot_override.c_str(), erase_first);
+                do_update(usb, "update.zip", slot_override.c_str(), erase_first);
                 skip(1);
             }
             wants_reboot = true;
@@ -1413,13 +1407,13 @@ int main(int argc, char **argv)
     if (wants_wipe) {
         fprintf(stderr, "wiping userdata...\n");
         fb_queue_erase("userdata");
-        fb_perform_format(transport, "userdata", 1, nullptr, nullptr);
+        fb_perform_format(usb, "userdata", 1, nullptr, nullptr);
 
         std::string cache_type;
-        if (fb_getvar(transport, "partition-type:cache", &cache_type) && !cache_type.empty()) {
+        if (fb_getvar(usb, "partition-type:cache", &cache_type) && !cache_type.empty()) {
             fprintf(stderr, "wiping cache...\n");
             fb_queue_erase("cache");
-            fb_perform_format(transport, "cache", 1, nullptr, nullptr);
+            fb_perform_format(usb, "cache", 1, nullptr, nullptr);
         }
     }
     if (wants_set_active) {
@@ -1433,5 +1427,5 @@ int main(int argc, char **argv)
         fb_queue_wait_for_disconnect();
     }
 
-    return fb_execute_queue(transport) ? EXIT_FAILURE : EXIT_SUCCESS;
+    return fb_execute_queue(usb) ? EXIT_FAILURE : EXIT_SUCCESS;
 }
diff --git a/fastboot/fastboot.h b/fastboot/fastboot.h
index acfbc1352..784ec5c10 100644
--- a/fastboot/fastboot.h
+++ b/fastboot/fastboot.h
@@ -34,22 +34,22 @@
 
 #include <string>
 
-#include "transport.h"
+#include "usb.h"
 
 struct sparse_file;
 
 /* protocol.c - fastboot protocol */
-int fb_command(Transport* transport, const char* cmd);
-int fb_command_response(Transport* transport, const char* cmd, char* response);
-int fb_download_data(Transport* transport, const void* data, uint32_t size);
-int fb_download_data_sparse(Transport* transport, struct sparse_file* s);
+int fb_command(usb_handle *usb, const char *cmd);
+int fb_command_response(usb_handle *usb, const char *cmd, char *response);
+int fb_download_data(usb_handle *usb, const void *data, uint32_t size);
+int fb_download_data_sparse(usb_handle *usb, struct sparse_file *s);
 char *fb_get_error(void);
 
 #define FB_COMMAND_SZ 64
 #define FB_RESPONSE_SZ 64
 
 /* engine.c - high level command queue engine */
-bool fb_getvar(Transport* transport, const std::string& key, std::string* value);
+bool fb_getvar(usb_handle* usb, const std::string& key, std::string* value);
 void fb_queue_flash(const char *ptn, void *data, uint32_t sz);
 void fb_queue_flash_sparse(const char *ptn, struct sparse_file *s, uint32_t sz);
 void fb_queue_erase(const char *ptn);
@@ -63,7 +63,7 @@ void fb_queue_command(const char *cmd, const char *msg);
 void fb_queue_download(const char *name, void *data, uint32_t size);
 void fb_queue_notice(const char *notice);
 void fb_queue_wait_for_disconnect(void);
-int fb_execute_queue(Transport* transport);
+int fb_execute_queue(usb_handle *usb);
 void fb_set_active(const char *slot);
 
 /* util stuff */
diff --git a/fastboot/protocol.cpp b/fastboot/protocol.cpp
index 4850b4a0d..cbd48e873 100644
--- a/fastboot/protocol.cpp
+++ b/fastboot/protocol.cpp
@@ -39,7 +39,6 @@
 #include <sparse/sparse.h>
 
 #include "fastboot.h"
-#include "transport.h"
 
 static char ERROR[128];
 
@@ -48,21 +47,21 @@ char *fb_get_error(void)
     return ERROR;
 }
 
-static int check_response(Transport* transport, uint32_t size, char* response) {
+static int check_response(usb_handle* usb, uint32_t size, char* response) {
     char status[65];
 
     while (true) {
-        int r = transport->Read(status, 64);
+        int r = usb_read(usb, status, 64);
         if (r < 0) {
             sprintf(ERROR, "status read failed (%s)", strerror(errno));
-            transport->Close();
+            usb_close(usb);
             return -1;
         }
         status[r] = 0;
 
         if (r < 4) {
             sprintf(ERROR, "status malformed (%d bytes)", r);
-            transport->Close();
+            usb_close(usb);
             return -1;
         }
 
@@ -91,21 +90,21 @@ static int check_response(Transport* transport, uint32_t size, char* response) {
             uint32_t dsize = strtol(status + 4, 0, 16);
             if (dsize > size) {
                 strcpy(ERROR, "data size too large");
-                transport->Close();
+                usb_close(usb);
                 return -1;
             }
             return dsize;
         }
 
         strcpy(ERROR,"unknown status code");
-        transport->Close();
+        usb_close(usb);
         break;
     }
 
     return -1;
 }
 
-static int _command_start(Transport* transport, const char* cmd, uint32_t size, char* response) {
+static int _command_start(usb_handle* usb, const char* cmd, uint32_t size, char* response) {
     size_t cmdsize = strlen(cmd);
     if (cmdsize > 64) {
         sprintf(ERROR, "command too large");
@@ -116,51 +115,51 @@ static int _command_start(Transport* transport, const char* cmd, uint32_t size,
         response[0] = 0;
     }
 
-    if (transport->Write(cmd, cmdsize) != static_cast<int>(cmdsize)) {
+    if (usb_write(usb, cmd, cmdsize) != static_cast<int>(cmdsize)) {
         sprintf(ERROR, "command write failed (%s)", strerror(errno));
-        transport->Close();
+        usb_close(usb);
         return -1;
     }
 
-    return check_response(transport, size, response);
+    return check_response(usb, size, response);
 }
 
-static int _command_data(Transport* transport, const void* data, uint32_t size) {
-    int r = transport->Write(data, size);
+static int _command_data(usb_handle* usb, const void* data, uint32_t size) {
+    int r = usb_write(usb, data, size);
     if (r < 0) {
         sprintf(ERROR, "data transfer failure (%s)", strerror(errno));
-        transport->Close();
+        usb_close(usb);
         return -1;
     }
     if (r != ((int) size)) {
         sprintf(ERROR, "data transfer failure (short transfer)");
-        transport->Close();
+        usb_close(usb);
         return -1;
     }
     return r;
 }
 
-static int _command_end(Transport* transport) {
-    return check_response(transport, 0, 0) < 0 ? -1 : 0;
+static int _command_end(usb_handle* usb) {
+    return check_response(usb, 0, 0) < 0 ? -1 : 0;
 }
 
-static int _command_send(Transport* transport, const char* cmd, const void* data, uint32_t size,
+static int _command_send(usb_handle* usb, const char* cmd, const void* data, uint32_t size,
                          char* response) {
     if (size == 0) {
         return -1;
     }
 
-    int r = _command_start(transport, cmd, size, response);
+    int r = _command_start(usb, cmd, size, response);
     if (r < 0) {
         return -1;
     }
 
-    r = _command_data(transport, data, size);
+    r = _command_data(usb, data, size);
     if (r < 0) {
         return -1;
     }
 
-    r = _command_end(transport);
+    r = _command_end(usb);
     if (r < 0) {
         return -1;
     }
@@ -168,59 +167,59 @@ static int _command_send(Transport* transport, const char* cmd, const void* data
     return size;
 }
 
-static int _command_send_no_data(Transport* transport, const char* cmd, char* response) {
-    return _command_start(transport, cmd, 0, response);
+static int _command_send_no_data(usb_handle* usb, const char* cmd, char* response) {
+    return _command_start(usb, cmd, 0, response);
 }
 
-int fb_command(Transport* transport, const char* cmd) {
-    return _command_send_no_data(transport, cmd, 0);
+int fb_command(usb_handle* usb, const char* cmd) {
+    return _command_send_no_data(usb, cmd, 0);
 }
 
-int fb_command_response(Transport* transport, const char* cmd, char* response) {
-    return _command_send_no_data(transport, cmd, response);
+int fb_command_response(usb_handle* usb, const char* cmd, char* response) {
+    return _command_send_no_data(usb, cmd, response);
 }
 
-int fb_download_data(Transport* transport, const void* data, uint32_t size) {
+int fb_download_data(usb_handle* usb, const void* data, uint32_t size) {
     char cmd[64];
     sprintf(cmd, "download:%08x", size);
-    return _command_send(transport, cmd, data, size, 0) < 0 ? -1 : 0;
+    return _command_send(usb, cmd, data, size, 0) < 0 ? -1 : 0;
 }
 
-#define TRANSPORT_BUF_SIZE 1024
-static char transport_buf[TRANSPORT_BUF_SIZE];
-static int transport_buf_len;
+#define USB_BUF_SIZE 1024
+static char usb_buf[USB_BUF_SIZE];
+static int usb_buf_len;
 
 static int fb_download_data_sparse_write(void *priv, const void *data, int len)
 {
     int r;
-    Transport* transport = reinterpret_cast<Transport*>(priv);
+    usb_handle* usb = reinterpret_cast<usb_handle*>(priv);
     int to_write;
     const char* ptr = reinterpret_cast<const char*>(data);
 
-    if (transport_buf_len) {
-        to_write = std::min(TRANSPORT_BUF_SIZE - transport_buf_len, len);
+    if (usb_buf_len) {
+        to_write = std::min(USB_BUF_SIZE - usb_buf_len, len);
 
-        memcpy(transport_buf + transport_buf_len, ptr, to_write);
-        transport_buf_len += to_write;
+        memcpy(usb_buf + usb_buf_len, ptr, to_write);
+        usb_buf_len += to_write;
         ptr += to_write;
         len -= to_write;
     }
 
-    if (transport_buf_len == TRANSPORT_BUF_SIZE) {
-        r = _command_data(transport, transport_buf, TRANSPORT_BUF_SIZE);
-        if (r != TRANSPORT_BUF_SIZE) {
+    if (usb_buf_len == USB_BUF_SIZE) {
+        r = _command_data(usb, usb_buf, USB_BUF_SIZE);
+        if (r != USB_BUF_SIZE) {
             return -1;
         }
-        transport_buf_len = 0;
+        usb_buf_len = 0;
     }
 
-    if (len > TRANSPORT_BUF_SIZE) {
-        if (transport_buf_len > 0) {
-            sprintf(ERROR, "internal error: transport_buf not empty\n");
+    if (len > USB_BUF_SIZE) {
+        if (usb_buf_len > 0) {
+            sprintf(ERROR, "internal error: usb_buf not empty\n");
             return -1;
         }
-        to_write = round_down(len, TRANSPORT_BUF_SIZE);
-        r = _command_data(transport, ptr, to_write);
+        to_write = round_down(len, USB_BUF_SIZE);
+        r = _command_data(usb, ptr, to_write);
         if (r != to_write) {
             return -1;
         }
@@ -229,28 +228,28 @@ static int fb_download_data_sparse_write(void *priv, const void *data, int len)
     }
 
     if (len > 0) {
-        if (len > TRANSPORT_BUF_SIZE) {
-            sprintf(ERROR, "internal error: too much left for transport_buf\n");
+        if (len > USB_BUF_SIZE) {
+            sprintf(ERROR, "internal error: too much left for usb_buf\n");
             return -1;
         }
-        memcpy(transport_buf, ptr, len);
-        transport_buf_len = len;
+        memcpy(usb_buf, ptr, len);
+        usb_buf_len = len;
     }
 
     return 0;
 }
 
-static int fb_download_data_sparse_flush(Transport* transport) {
-    if (transport_buf_len > 0) {
-        if (_command_data(transport, transport_buf, transport_buf_len) != transport_buf_len) {
+static int fb_download_data_sparse_flush(usb_handle* usb) {
+    if (usb_buf_len > 0) {
+        if (_command_data(usb, usb_buf, usb_buf_len) != usb_buf_len) {
             return -1;
         }
-        transport_buf_len = 0;
+        usb_buf_len = 0;
     }
     return 0;
 }
 
-int fb_download_data_sparse(Transport* transport, struct sparse_file* s) {
+int fb_download_data_sparse(usb_handle* usb, struct sparse_file* s) {
     int size = sparse_file_len(s, true, false);
     if (size <= 0) {
         return -1;
@@ -258,20 +257,20 @@ int fb_download_data_sparse(Transport* transport, struct sparse_file* s) {
 
     char cmd[64];
     sprintf(cmd, "download:%08x", size);
-    int r = _command_start(transport, cmd, size, 0);
+    int r = _command_start(usb, cmd, size, 0);
     if (r < 0) {
         return -1;
     }
 
-    r = sparse_file_callback(s, true, false, fb_download_data_sparse_write, transport);
+    r = sparse_file_callback(s, true, false, fb_download_data_sparse_write, usb);
     if (r < 0) {
         return -1;
     }
 
-    r = fb_download_data_sparse_flush(transport);
+    r = fb_download_data_sparse_flush(usb);
     if (r < 0) {
         return -1;
     }
 
-    return _command_end(transport);
+    return _command_end(usb);
 }
diff --git a/fastboot/transport.h b/fastboot/transport.h
deleted file mode 100644
index 55a5abbc0..000000000
--- a/fastboot/transport.h
+++ /dev/null
@@ -1,48 +0,0 @@
-/*
- * Copyright (C) 2015 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.
- */
-
-#ifndef TRANSPORT_H_
-#define TRANSPORT_H_
-
-#include <base/macros.h>
-
-// General interface to allow the fastboot protocol to be used over different
-// types of transports.
-class Transport {
-  public:
-    Transport() = default;
-    virtual ~Transport() = default;
-
-    // Reads |len| bytes into |data|. Returns the number of bytes actually
-    // read or -1 on error.
-    virtual ssize_t Read(void* data, size_t len) = 0;
-
-    // Writes |len| bytes from |data|. Returns the number of bytes actually
-    // written or -1 on error.
-    virtual ssize_t Write(const void* data, size_t len) = 0;
-
-    // Closes the underlying transport. Returns 0 on success.
-    virtual int Close() = 0;
-
-    // Blocks until the transport disconnects. Transports that don't support
-    // this will return immediately. Returns 0 on success.
-    virtual int WaitForDisconnect() { return 0; }
-
-  private:
-    DISALLOW_COPY_AND_ASSIGN(Transport);
-};
-
-#endif  // TRANSPORT_H_
diff --git a/fastboot/usb.h b/fastboot/usb.h
index 4acf12d57..0fda41aae 100644
--- a/fastboot/usb.h
+++ b/fastboot/usb.h
@@ -29,7 +29,7 @@
 #ifndef _USB_H_
 #define _USB_H_
 
-#include "transport.h"
+struct usb_handle;
 
 struct usb_ifc_info {
         /* from device descriptor */
@@ -55,6 +55,10 @@ struct usb_ifc_info {
 
 typedef int (*ifc_match_func)(usb_ifc_info *ifc);
 
-Transport* usb_open(ifc_match_func callback);
+usb_handle *usb_open(ifc_match_func callback);
+int usb_close(usb_handle *h);
+int usb_read(usb_handle *h, void *_data, int len);
+int usb_write(usb_handle *h, const void *_data, int len);
+int usb_wait_for_disconnect(usb_handle *h);
 
 #endif
diff --git a/fastboot/usb_linux.cpp b/fastboot/usb_linux.cpp
index 02ffcd978..7b879073d 100644
--- a/fastboot/usb_linux.cpp
+++ b/fastboot/usb_linux.cpp
@@ -43,8 +43,6 @@
 #include <linux/version.h>
 #include <linux/usb/ch9.h>
 
-#include <memory>
-
 #include "fastboot.h"
 #include "usb.h"
 
@@ -87,22 +85,6 @@ struct usb_handle
     unsigned char ep_out;
 };
 
-class LinuxUsbTransport : public Transport {
-  public:
-    LinuxUsbTransport(std::unique_ptr<usb_handle> handle) : handle_(std::move(handle)) {}
-    ~LinuxUsbTransport() override = default;
-
-    ssize_t Read(void* data, size_t len) override;
-    ssize_t Write(const void* data, size_t len) override;
-    int Close() override;
-    int WaitForDisconnect() override;
-
-  private:
-    std::unique_ptr<usb_handle> handle_;
-
-    DISALLOW_COPY_AND_ASSIGN(LinuxUsbTransport);
-};
-
 /* True if name isn't a valid name for a USB device in /sys/bus/usb/devices.
  * Device names are made up of numbers, dots, and dashes, e.g., '7-1.5'.
  * We reject interfaces (e.g., '7-1.5:1.0') and host controllers (e.g. 'usb1').
@@ -326,9 +308,9 @@ static int convert_to_devfs_name(const char* sysfs_name,
     return 0;
 }
 
-static std::unique_ptr<usb_handle> find_usb_device(const char* base, ifc_match_func callback)
+static usb_handle *find_usb_device(const char *base, ifc_match_func callback)
 {
-    std::unique_ptr<usb_handle> usb;
+    usb_handle *usb = 0;
     char devname[64];
     char desc[1024];
     int n, in, out, ifc;
@@ -339,37 +321,39 @@ static std::unique_ptr<usb_handle> find_usb_device(const char* base, ifc_match_f
     int writable;
 
     busdir = opendir(base);
-    if (busdir == 0) return 0;
+    if(busdir == 0) return 0;
 
-    while ((de = readdir(busdir)) && (usb == nullptr)) {
-        if (badname(de->d_name)) continue;
+    while((de = readdir(busdir)) && (usb == 0)) {
+        if(badname(de->d_name)) continue;
 
-        if (!convert_to_devfs_name(de->d_name, devname, sizeof(devname))) {
+        if(!convert_to_devfs_name(de->d_name, devname, sizeof(devname))) {
 
 //            DBG("[ scanning %s ]\n", devname);
             writable = 1;
-            if ((fd = open(devname, O_RDWR)) < 0) {
+            if((fd = open(devname, O_RDWR)) < 0) {
                 // Check if we have read-only access, so we can give a helpful
                 // diagnostic like "adb devices" does.
                 writable = 0;
-                if ((fd = open(devname, O_RDONLY)) < 0) {
+                if((fd = open(devname, O_RDONLY)) < 0) {
                     continue;
                 }
             }
 
             n = read(fd, desc, sizeof(desc));
 
-            if (filter_usb_device(de->d_name, desc, n, writable, callback, &in, &out, &ifc) == 0) {
-                usb.reset(new usb_handle());
+            if(filter_usb_device(de->d_name, desc, n, writable, callback,
+                                 &in, &out, &ifc) == 0) {
+                usb = reinterpret_cast<usb_handle*>(calloc(1, sizeof(usb_handle)));
                 strcpy(usb->fname, devname);
                 usb->ep_in = in;
                 usb->ep_out = out;
                 usb->desc = fd;
 
                 n = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &ifc);
-                if (n != 0) {
+                if(n != 0) {
                     close(fd);
-                    usb.reset();
+                    free(usb);
+                    usb = 0;
                     continue;
                 }
             } else {
@@ -382,14 +366,14 @@ static std::unique_ptr<usb_handle> find_usb_device(const char* base, ifc_match_f
     return usb;
 }
 
-ssize_t LinuxUsbTransport::Write(const void* _data, size_t len)
+int usb_write(usb_handle *h, const void *_data, int len)
 {
     unsigned char *data = (unsigned char*) _data;
     unsigned count = 0;
     struct usbdevfs_bulktransfer bulk;
     int n;
 
-    if (handle_->ep_out == 0 || handle_->desc == -1) {
+    if(h->ep_out == 0 || h->desc == -1) {
         return -1;
     }
 
@@ -397,12 +381,12 @@ ssize_t LinuxUsbTransport::Write(const void* _data, size_t len)
         int xfer;
         xfer = (len > MAX_USBFS_BULK_SIZE) ? MAX_USBFS_BULK_SIZE : len;
 
-        bulk.ep = handle_->ep_out;
+        bulk.ep = h->ep_out;
         bulk.len = xfer;
         bulk.data = data;
         bulk.timeout = 0;
 
-        n = ioctl(handle_->desc, USBDEVFS_BULK, &bulk);
+        n = ioctl(h->desc, USBDEVFS_BULK, &bulk);
         if(n != xfer) {
             DBG("ERROR: n = %d, errno = %d (%s)\n",
                 n, errno, strerror(errno));
@@ -417,30 +401,30 @@ ssize_t LinuxUsbTransport::Write(const void* _data, size_t len)
     return count;
 }
 
-ssize_t LinuxUsbTransport::Read(void* _data, size_t len)
+int usb_read(usb_handle *h, void *_data, int len)
 {
     unsigned char *data = (unsigned char*) _data;
     unsigned count = 0;
     struct usbdevfs_bulktransfer bulk;
     int n, retry;
 
-    if (handle_->ep_in == 0 || handle_->desc == -1) {
+    if(h->ep_in == 0 || h->desc == -1) {
         return -1;
     }
 
     while(len > 0) {
         int xfer = (len > MAX_USBFS_BULK_SIZE) ? MAX_USBFS_BULK_SIZE : len;
 
-        bulk.ep = handle_->ep_in;
+        bulk.ep = h->ep_in;
         bulk.len = xfer;
         bulk.data = data;
         bulk.timeout = 0;
         retry = 0;
 
         do{
-           DBG("[ usb read %d fd = %d], fname=%s\n", xfer, handle_->desc, handle_->fname);
-           n = ioctl(handle_->desc, USBDEVFS_BULK, &bulk);
-           DBG("[ usb read %d ] = %d, fname=%s, Retry %d \n", xfer, n, handle_->fname, retry);
+           DBG("[ usb read %d fd = %d], fname=%s\n", xfer, h->desc, h->fname);
+           n = ioctl(h->desc, USBDEVFS_BULK, &bulk);
+           DBG("[ usb read %d ] = %d, fname=%s, Retry %d \n", xfer, n, h->fname, retry);
 
            if( n < 0 ) {
             DBG1("ERROR: n = %d, errno = %d (%s)\n",n, errno, strerror(errno));
@@ -462,12 +446,24 @@ ssize_t LinuxUsbTransport::Read(void* _data, size_t len)
     return count;
 }
 
-int LinuxUsbTransport::Close()
+void usb_kick(usb_handle *h)
+{
+    int fd;
+
+    fd = h->desc;
+    h->desc = -1;
+    if(fd >= 0) {
+        close(fd);
+        DBG("[ usb closed %d ]\n", fd);
+    }
+}
+
+int usb_close(usb_handle *h)
 {
     int fd;
 
-    fd = handle_->desc;
-    handle_->desc = -1;
+    fd = h->desc;
+    h->desc = -1;
     if(fd >= 0) {
         close(fd);
         DBG("[ usb closed %d ]\n", fd);
@@ -476,21 +472,20 @@ int LinuxUsbTransport::Close()
     return 0;
 }
 
-Transport* usb_open(ifc_match_func callback)
+usb_handle *usb_open(ifc_match_func callback)
 {
-    std::unique_ptr<usb_handle> handle = find_usb_device("/sys/bus/usb/devices", callback);
-    return handle ? new LinuxUsbTransport(std::move(handle)) : nullptr;
+    return find_usb_device("/sys/bus/usb/devices", callback);
 }
 
 /* Wait for the system to notice the device is gone, so that a subsequent
  * fastboot command won't try to access the device before it's rebooted.
  * Returns 0 for success, -1 for timeout.
  */
-int LinuxUsbTransport::WaitForDisconnect()
+int usb_wait_for_disconnect(usb_handle *usb)
 {
   double deadline = now() + WAIT_FOR_DISCONNECT_TIMEOUT;
   while (now() < deadline) {
-    if (access(handle_->fname, F_OK))
+    if (access(usb->fname, F_OK))
       return 0;
     usleep(50000);
   }
diff --git a/fastboot/usb_osx.cpp b/fastboot/usb_osx.cpp
index ee5d57530..45ae833e5 100644
--- a/fastboot/usb_osx.cpp
+++ b/fastboot/usb_osx.cpp
@@ -35,8 +35,6 @@
 #include <IOKit/IOMessage.h>
 #include <mach/mach_port.h>
 
-#include <memory>
-
 #include "usb.h"
 
 
@@ -65,21 +63,6 @@ struct usb_handle
     unsigned int zero_mask;
 };
 
-class OsxUsbTransport : public Transport {
-  public:
-    OsxUsbTransport(std::unique_ptr<usb_handle> handle) : handle_(std::move(handle)) {}
-    ~OsxUsbTransport() override = default;
-
-    ssize_t Read(void* data, size_t len) override;
-    ssize_t Write(const void* data, size_t len) override;
-    int Close() override;
-
-  private:
-    std::unique_ptr<usb_handle> handle_;
-
-    DISALLOW_COPY_AND_ASSIGN(OsxUsbTransport);
-};
-
 /** Try out all the interfaces and see if there's a match. Returns 0 on
  * success, -1 on failure. */
 static int try_interfaces(IOUSBDeviceInterface182 **dev, usb_handle *handle) {
@@ -407,7 +390,7 @@ static int try_device(io_service_t device, usb_handle *handle) {
 
 
 /** Initializes the USB system. Returns 0 on success, -1 on error. */
-static int init_usb(ifc_match_func callback, std::unique_ptr<usb_handle>* handle) {
+static int init_usb(ifc_match_func callback, usb_handle **handle) {
     int ret = -1;
     CFMutableDictionaryRef matchingDict;
     kern_return_t result;
@@ -460,8 +443,8 @@ static int init_usb(ifc_match_func callback, std::unique_ptr<usb_handle>* handle
         }
 
         if (h.success) {
-            handle->reset(new usb_handle);
-            memcpy(handle->get(), &h, sizeof(usb_handle));
+            *handle = reinterpret_cast<usb_handle*>(calloc(1, sizeof(usb_handle)));
+            memcpy(*handle, &h, sizeof(usb_handle));
             ret = 0;
             break;
         }
@@ -480,23 +463,28 @@ static int init_usb(ifc_match_func callback, std::unique_ptr<usb_handle>* handle
  * Definitions of this file's public functions.
  */
 
-Transport* usb_open(ifc_match_func callback) {
-    std::unique_ptr<usb_handle> handle;
+usb_handle *usb_open(ifc_match_func callback) {
+    usb_handle *handle = NULL;
 
     if (init_usb(callback, &handle) < 0) {
         /* Something went wrong initializing USB. */
-        return nullptr;
+        return NULL;
     }
 
-    return new OsxUsbTransport(std::move(handle));
+    return handle;
 }
 
-int OsxUsbTransport::Close() {
+int usb_close(usb_handle *h) {
     /* TODO: Something better here? */
     return 0;
 }
 
-ssize_t OsxUsbTransport::Read(void* data, size_t len) {
+int usb_wait_for_disconnect(usb_handle *usb) {
+    /* TODO: Punt for now */
+    return 0;
+}
+
+int usb_read(usb_handle *h, void *data, int len) {
     IOReturn result;
     UInt32 numBytes = len;
 
@@ -504,21 +492,22 @@ ssize_t OsxUsbTransport::Read(void* data, size_t len) {
         return 0;
     }
 
-    if (handle_ == nullptr) {
+    if (h == NULL) {
         return -1;
     }
 
-    if (handle_->interface == nullptr) {
+    if (h->interface == NULL) {
         ERR("usb_read interface was null\n");
         return -1;
     }
 
-    if (handle_->bulkIn == 0) {
+    if (h->bulkIn == 0) {
         ERR("bulkIn endpoint not assigned\n");
         return -1;
     }
 
-    result = (*handle_->interface)->ReadPipe(handle_->interface, handle_->bulkIn, data, &numBytes);
+    result = (*h->interface)->ReadPipe(
+            h->interface, h->bulkIn, data, &numBytes);
 
     if (result == 0) {
         return (int) numBytes;
@@ -529,30 +518,30 @@ ssize_t OsxUsbTransport::Read(void* data, size_t len) {
     return -1;
 }
 
-ssize_t OsxUsbTransport::Write(const void* data, size_t len) {
+int usb_write(usb_handle *h, const void *data, int len) {
     IOReturn result;
 
     if (len == 0) {
         return 0;
     }
 
-    if (handle_ == NULL) {
+    if (h == NULL) {
         return -1;
     }
 
-    if (handle_->interface == NULL) {
+    if (h->interface == NULL) {
         ERR("usb_write interface was null\n");
         return -1;
     }
 
-    if (handle_->bulkOut == 0) {
+    if (h->bulkOut == 0) {
         ERR("bulkOut endpoint not assigned\n");
         return -1;
     }
 
 #if 0
-    result = (*handle_->interface)->WritePipe(
-            handle_->interface, handle_->bulkOut, (void *)data, len);
+    result = (*h->interface)->WritePipe(
+            h->interface, h->bulkOut, (void *)data, len);
 #else
     /* Attempt to work around crashes in the USB driver that may be caused
      * by trying to write too much data at once.  The kernel IOCopyMapper
@@ -565,8 +554,8 @@ ssize_t OsxUsbTransport::Write(const void* data, size_t len) {
         int lenToSend = lenRemaining > maxLenToSend
             ? maxLenToSend : lenRemaining;
 
-        result = (*handle_->interface)->WritePipe(
-                handle_->interface, handle_->bulkOut, (void *)data, lenToSend);
+        result = (*h->interface)->WritePipe(
+                h->interface, h->bulkOut, (void *)data, lenToSend);
         if (result != 0) break;
 
         lenRemaining -= lenToSend;
@@ -575,11 +564,11 @@ ssize_t OsxUsbTransport::Write(const void* data, size_t len) {
 #endif
 
     #if 0
-    if ((result == 0) && (handle_->zero_mask)) {
+    if ((result == 0) && (h->zero_mask)) {
         /* we need 0-markers and our transfer */
-        if(!(len & handle_->zero_mask)) {
-            result = (*handle_->interface)->WritePipe(
-                    handle_->interface, handle_->bulkOut, (void *)data, 0);
+        if(!(len & h->zero_mask)) {
+            result = (*h->interface)->WritePipe(
+                    h->interface, h->bulkOut, (void *)data, 0);
         }
     }
     #endif
diff --git a/fastboot/usb_windows.cpp b/fastboot/usb_windows.cpp
index 443382d9a..a09610f5c 100644
--- a/fastboot/usb_windows.cpp
+++ b/fastboot/usb_windows.cpp
@@ -34,9 +34,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-#include <memory>
-#include <string>
-
 #include "usb.h"
 
 //#define TRACE_USB 1
@@ -63,32 +60,24 @@ struct usb_handle {
     ADBAPIHANDLE  adb_write_pipe;
 
     /// Interface name
-    std::string interface_name;
-};
-
-class WindowsUsbTransport : public Transport {
-  public:
-    WindowsUsbTransport(std::unique_ptr<usb_handle> handle) : handle_(std::move(handle)) {}
-    ~WindowsUsbTransport() override = default;
-
-    ssize_t Read(void* data, size_t len) override;
-    ssize_t Write(const void* data, size_t len) override;
-    int Close() override;
-
-  private:
-    std::unique_ptr<usb_handle> handle_;
-
-    DISALLOW_COPY_AND_ASSIGN(WindowsUsbTransport);
+    char*         interface_name;
 };
 
 /// Class ID assigned to the device by androidusb.sys
 static const GUID usb_class_id = ANDROID_USB_CLASS_ID;
 
+
 /// Checks if interface (device) matches certain criteria
 int recognized_device(usb_handle* handle, ifc_match_func callback);
 
 /// Opens usb interface (device) by interface (device) name.
-std::unique_ptr<usb_handle> do_usb_open(const wchar_t* interface_name);
+usb_handle* do_usb_open(const wchar_t* interface_name);
+
+/// Writes data to the opened usb handle
+int usb_write(usb_handle* handle, const void* data, int len);
+
+/// Reads data using the opened usb handle
+int usb_read(usb_handle *handle, void* data, int len);
 
 /// Cleans up opened usb handle
 void usb_cleanup_handle(usb_handle* handle);
@@ -96,17 +85,23 @@ void usb_cleanup_handle(usb_handle* handle);
 /// Cleans up (but don't close) opened usb handle
 void usb_kick(usb_handle* handle);
 
+/// Closes opened usb handle
+int usb_close(usb_handle* handle);
+
 
-std::unique_ptr<usb_handle> do_usb_open(const wchar_t* interface_name) {
+usb_handle* do_usb_open(const wchar_t* interface_name) {
     // Allocate our handle
-    std::unique_ptr<usb_handle> ret = new usb_handle;
+    usb_handle* ret = (usb_handle*)malloc(sizeof(usb_handle));
+    if (NULL == ret)
+        return NULL;
 
     // Create interface.
     ret->adb_interface = AdbCreateInterfaceByName(interface_name);
 
-    if (nullptr == ret->adb_interface) {
+    if (NULL == ret->adb_interface) {
+        free(ret);
         errno = GetLastError();
-        return nullptr;
+        return NULL;
     }
 
     // Open read pipe (endpoint)
@@ -114,30 +109,35 @@ std::unique_ptr<usb_handle> do_usb_open(const wchar_t* interface_name) {
         AdbOpenDefaultBulkReadEndpoint(ret->adb_interface,
                                    AdbOpenAccessTypeReadWrite,
                                    AdbOpenSharingModeReadWrite);
-    if (nullptr != ret->adb_read_pipe) {
+    if (NULL != ret->adb_read_pipe) {
         // Open write pipe (endpoint)
         ret->adb_write_pipe =
             AdbOpenDefaultBulkWriteEndpoint(ret->adb_interface,
                                       AdbOpenAccessTypeReadWrite,
                                       AdbOpenSharingModeReadWrite);
-        if (nullptr != ret->adb_write_pipe) {
+        if (NULL != ret->adb_write_pipe) {
             // Save interface name
             unsigned long name_len = 0;
 
             // First get expected name length
             AdbGetInterfaceName(ret->adb_interface,
-                          nullptr,
+                          NULL,
                           &name_len,
                           true);
             if (0 != name_len) {
-                // Now save the name
-                ret->interface_name.resize(name_len);
-                if (AdbGetInterfaceName(ret->adb_interface,
-                              &ret->interface_name[0],
-                              &name_len,
-                              true)) {
-                    // We're done at this point
-                    return ret;
+                ret->interface_name = (char*)malloc(name_len);
+
+                if (NULL != ret->interface_name) {
+                    // Now save the name
+                    if (AdbGetInterfaceName(ret->adb_interface,
+                                  ret->interface_name,
+                                  &name_len,
+                                  true)) {
+                        // We're done at this point
+                        return ret;
+                    }
+                } else {
+                    SetLastError(ERROR_OUTOFMEMORY);
                 }
             }
         }
@@ -145,31 +145,35 @@ std::unique_ptr<usb_handle> do_usb_open(const wchar_t* interface_name) {
 
     // Something went wrong.
     errno = GetLastError();
-    usb_cleanup_handle(ret.get());
+    usb_cleanup_handle(ret);
+    free(ret);
     SetLastError(errno);
 
-    return nullptr;
+    return NULL;
 }
 
-ssize_t WindowsUsbTransport::Write(const void* data, size_t len) {
+int usb_write(usb_handle* handle, const void* data, int len) {
     unsigned long time_out = 5000;
     unsigned long written = 0;
     unsigned count = 0;
     int ret;
 
     DBG("usb_write %d\n", len);
-    if (nullptr != handle_) {
+    if (NULL != handle) {
         // Perform write
         while(len > 0) {
             int xfer = (len > MAX_USBFS_BULK_SIZE) ? MAX_USBFS_BULK_SIZE : len;
-            ret = AdbWriteEndpointSync(handle_->adb_write_pipe, const_cast<void*>(data), xfer,
-                                       &written, time_out);
+            ret = AdbWriteEndpointSync(handle->adb_write_pipe,
+                                   (void*)data,
+                                   (unsigned long)xfer,
+                                   &written,
+                                   time_out);
             errno = GetLastError();
             DBG("AdbWriteEndpointSync returned %d, errno: %d\n", ret, errno);
             if (ret == 0) {
                 // assume ERROR_INVALID_HANDLE indicates we are disconnected
                 if (errno == ERROR_INVALID_HANDLE)
-                usb_kick(handle_.get());
+                usb_kick(handle);
                 return -1;
             }
 
@@ -190,17 +194,21 @@ ssize_t WindowsUsbTransport::Write(const void* data, size_t len) {
     return -1;
 }
 
-ssize_t WindowsUsbTransport::Read(void* data, size_t len) {
+int usb_read(usb_handle *handle, void* data, int len) {
     unsigned long time_out = 0;
     unsigned long read = 0;
     int ret;
 
     DBG("usb_read %d\n", len);
-    if (nullptr != handle_) {
+    if (NULL != handle) {
         while (1) {
             int xfer = (len > MAX_USBFS_BULK_SIZE) ? MAX_USBFS_BULK_SIZE : len;
 
-            ret = AdbReadEndpointSync(handle_->adb_read_pipe, data, xfer, &read, time_out);
+	        ret = AdbReadEndpointSync(handle->adb_read_pipe,
+	                              (void*)data,
+	                              (unsigned long)xfer,
+	                              &read,
+	                              time_out);
             errno = GetLastError();
             DBG("usb_read got: %ld, expected: %d, errno: %d\n", read, xfer, errno);
             if (ret) {
@@ -208,7 +216,7 @@ ssize_t WindowsUsbTransport::Read(void* data, size_t len) {
             } else {
                 // assume ERROR_INVALID_HANDLE indicates we are disconnected
                 if (errno == ERROR_INVALID_HANDLE)
-                    usb_kick(handle_.get());
+                    usb_kick(handle);
                 break;
             }
             // else we timed out - try again
@@ -225,6 +233,8 @@ ssize_t WindowsUsbTransport::Read(void* data, size_t len) {
 
 void usb_cleanup_handle(usb_handle* handle) {
     if (NULL != handle) {
+        if (NULL != handle->interface_name)
+            free(handle->interface_name);
         if (NULL != handle->adb_write_pipe)
             AdbCloseHandle(handle->adb_write_pipe);
         if (NULL != handle->adb_read_pipe)
@@ -232,7 +242,7 @@ void usb_cleanup_handle(usb_handle* handle) {
         if (NULL != handle->adb_interface)
             AdbCloseHandle(handle->adb_interface);
 
-        handle->interface_name.clear();
+        handle->interface_name = NULL;
         handle->adb_write_pipe = NULL;
         handle->adb_read_pipe = NULL;
         handle->adb_interface = NULL;
@@ -248,18 +258,23 @@ void usb_kick(usb_handle* handle) {
     }
 }
 
-int WindowsUsbTransport::Close() {
+int usb_close(usb_handle* handle) {
     DBG("usb_close\n");
 
-    if (nullptr != handle_) {
+    if (NULL != handle) {
         // Cleanup handle
-        usb_cleanup_handle(handle_.get());
-        handle_.reset();
+        usb_cleanup_handle(handle);
+        free(handle);
     }
 
     return 0;
 }
 
+int usb_wait_for_disconnect(usb_handle *usb) {
+    /* TODO: Punt for now */
+    return 0;
+}
+
 int recognized_device(usb_handle* handle, ifc_match_func callback) {
     struct usb_ifc_info info;
     USB_DEVICE_DESCRIPTOR device_desc;
@@ -311,8 +326,8 @@ int recognized_device(usb_handle* handle, ifc_match_func callback) {
     return 0;
 }
 
-static std::unique_ptr<usb_handle> find_usb_device(ifc_match_func callback) {
-    std::unique_ptr<usb_handle> handle;
+static usb_handle *find_usb_device(ifc_match_func callback) {
+	usb_handle* handle = NULL;
     char entry_buffer[2048];
     char interf_name[2048];
     AdbInterfaceInfo* next_interface = (AdbInterfaceInfo*)(&entry_buffer[0]);
@@ -341,12 +356,13 @@ static std::unique_ptr<usb_handle> find_usb_device(ifc_match_func callback) {
         handle = do_usb_open(next_interface->device_name);
         if (NULL != handle) {
             // Lets see if this interface (device) belongs to us
-            if (recognized_device(handle.get(), callback)) {
+            if (recognized_device(handle, callback)) {
                 // found it!
                 break;
             } else {
-                usb_cleanup_handle(handle.get());
-                handle.reset();
+                usb_cleanup_handle(handle);
+                free(handle);
+                handle = NULL;
             }
         }
 
@@ -357,10 +373,9 @@ static std::unique_ptr<usb_handle> find_usb_device(ifc_match_func callback) {
     return handle;
 }
 
-Transport* usb_open(ifc_match_func callback)
+usb_handle *usb_open(ifc_match_func callback)
 {
-    std::unique_ptr<usb_handle> handle = find_usb_device(callback);
-    return handle ? new WindowsUsbTransport(std::move(handle)) : nullptr;
+    return find_usb_device(callback);
 }
 
 // called from fastboot.c
diff --git a/fastboot/usbtest.cpp b/fastboot/usbtest.cpp
index 9423c6d96..e6e2b37e0 100644
--- a/fastboot/usbtest.cpp
+++ b/fastboot/usbtest.cpp
@@ -86,7 +86,7 @@ int match_loop(usb_ifc_info *info)
     return 0;
 }
 
-int test_null(Transport* usb)
+int test_null(usb_handle *usb)
 {
     unsigned i;
     unsigned char buf[4096];
@@ -94,8 +94,8 @@ int test_null(Transport* usb)
     long long t0, t1;
 
     t0 = NOW();
-    for (i = 0; i < arg_count; i++) {
-        if (usb->Write(buf, arg_size) != static_cast<int>(arg_size)) {
+    for(i = 0; i < arg_count; i++) {
+        if(usb_write(usb, buf, arg_size) != (int)arg_size) {
             fprintf(stderr,"write failed (%s)\n", strerror(errno));
             return -1;
         }
@@ -105,15 +105,15 @@ int test_null(Transport* usb)
     return 0;
 }
 
-int test_zero(Transport* usb)
+int test_zero(usb_handle *usb)
 {
     unsigned i;
     unsigned char buf[4096];
     long long t0, t1;
 
     t0 = NOW();
-    for (i = 0; i < arg_count; i++) {
-        if (usb->Read(buf, arg_size) != static_cast<int>(arg_size)) {
+    for(i = 0; i < arg_count; i++) {
+        if(usb_read(usb, buf, arg_size) != (int)arg_size) {
             fprintf(stderr,"read failed (%s)\n", strerror(errno));
             return -1;
         }
@@ -127,7 +127,7 @@ struct
 {
     const char *cmd;
     ifc_match_func match;
-    int (*test)(Transport* usb);
+    int (*test)(usb_handle *usb);
     const char *help;
 } tests[] = {
     { "list", printifc,   NULL,      "list interfaces" },
@@ -177,7 +177,7 @@ int process_args(int argc, char **argv)
 
 int main(int argc, char **argv)
 {
-    Transport* usb;
+    usb_handle *usb;
     int i;
 
     if(argc < 2)