auto import from //depot/cupcake/@135843
diff --git a/adb/transport.c b/adb/transport.c
new file mode 100644
index 0000000..c76f1a5
--- /dev/null
+++ b/adb/transport.c
@@ -0,0 +1,958 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include "sysdeps.h"
+
+#define TRACE_TAG TRACE_TRANSPORT
+#include "adb.h"
+
+static void transport_unref(atransport *t);
+
+static atransport transport_list = {
+ .next = &transport_list,
+ .prev = &transport_list,
+};
+
+ADB_MUTEX_DEFINE( transport_lock );
+
+#if ADB_TRACE
+static void dump_hex( const unsigned char* ptr, size_t len )
+{
+ int nn, len2 = len;
+
+ if (len2 > 16) len2 = 16;
+
+ for (nn = 0; nn < len2; nn++)
+ D("%02x", ptr[nn]);
+ D(" ");
+
+ for (nn = 0; nn < len2; nn++) {
+ int c = ptr[nn];
+ if (c < 32 || c > 127)
+ c = '.';
+ D("%c", c);
+ }
+ D("\n");
+ fflush(stdout);
+}
+#endif
+
+void
+kick_transport(atransport* t)
+{
+ if (t && !t->kicked)
+ {
+ int kicked;
+
+ adb_mutex_lock(&transport_lock);
+ kicked = t->kicked;
+ if (!kicked)
+ t->kicked = 1;
+ adb_mutex_unlock(&transport_lock);
+
+ if (!kicked)
+ t->kick(t);
+ }
+}
+
+void
+run_transport_disconnects(atransport* t)
+{
+ adisconnect* dis = t->disconnects.next;
+
+ D("run_transport_disconnects: %p (%s)\n", t, t->serial ? t->serial : "unknown" );
+ while (dis != &t->disconnects) {
+ adisconnect* next = dis->next;
+ dis->func( dis->opaque, t );
+ dis = next;
+ }
+}
+
+static int
+read_packet(int fd, apacket** ppacket)
+{
+ char *p = (char*)ppacket; /* really read a packet address */
+ int r;
+ int len = sizeof(*ppacket);
+ while(len > 0) {
+ r = adb_read(fd, p, len);
+ if(r > 0) {
+ len -= r;
+ p += r;
+ } else {
+ D("read_packet: %d error %d %d\n", fd, r, errno);
+ if((r < 0) && (errno == EINTR)) continue;
+ return -1;
+ }
+ }
+
+#if ADB_TRACE
+ if (ADB_TRACING)
+ {
+ unsigned command = (*ppacket)->msg.command;
+ int len = (*ppacket)->msg.data_length;
+ char cmd[5];
+ int n;
+
+ for (n = 0; n < 4; n++) {
+ int b = (command >> (n*8)) & 255;
+ if (b >= 32 && b < 127)
+ cmd[n] = (char)b;
+ else
+ cmd[n] = '.';
+ }
+ cmd[4] = 0;
+
+ D("read_packet: %d ok: [%08x %s] %08x %08x (%d) ",
+ fd, command, cmd, (*ppacket)->msg.arg0, (*ppacket)->msg.arg1, len);
+ dump_hex((*ppacket)->data, len);
+ }
+#endif
+ return 0;
+}
+
+static int
+write_packet(int fd, apacket** ppacket)
+{
+ char *p = (char*) ppacket; /* we really write the packet address */
+ int r, len = sizeof(ppacket);
+
+#if ADB_TRACE
+ if (ADB_TRACING)
+ {
+ unsigned command = (*ppacket)->msg.command;
+ int len = (*ppacket)->msg.data_length;
+ char cmd[5];
+ int n;
+
+ for (n = 0; n < 4; n++) {
+ int b = (command >> (n*8)) & 255;
+ if (b >= 32 && b < 127)
+ cmd[n] = (char)b;
+ else
+ cmd[n] = '.';
+ }
+ cmd[4] = 0;
+
+ D("write_packet: %d [%08x %s] %08x %08x (%d) ",
+ fd, command, cmd, (*ppacket)->msg.arg0, (*ppacket)->msg.arg1, len);
+ dump_hex((*ppacket)->data, len);
+ }
+#endif
+ len = sizeof(ppacket);
+ while(len > 0) {
+ r = adb_write(fd, p, len);
+ if(r > 0) {
+ len -= r;
+ p += r;
+ } else {
+ D("write_packet: %d error %d %d\n", fd, r, errno);
+ if((r < 0) && (errno == EINTR)) continue;
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static void transport_socket_events(int fd, unsigned events, void *_t)
+{
+ if(events & FDE_READ){
+ apacket *p = 0;
+ if(read_packet(fd, &p)){
+ D("failed to read packet from transport socket on fd %d\n", fd);
+ } else {
+ handle_packet(p, (atransport *) _t);
+ }
+ }
+}
+
+void send_packet(apacket *p, atransport *t)
+{
+ unsigned char *x;
+ unsigned sum;
+ unsigned count;
+
+ p->msg.magic = p->msg.command ^ 0xffffffff;
+
+ count = p->msg.data_length;
+ x = (unsigned char *) p->data;
+ sum = 0;
+ while(count-- > 0){
+ sum += *x++;
+ }
+ p->msg.data_check = sum;
+
+ print_packet("send", p);
+
+ if (t == NULL) {
+ fatal_errno("Transport is null");
+ D("Transport is null \n");
+ }
+
+ if(write_packet(t->transport_socket, &p)){
+ fatal_errno("cannot enqueue packet on transport socket");
+ }
+}
+
+/* The transport is opened by transport_register_func before
+** the input and output threads are started.
+**
+** The output thread issues a SYNC(1, token) message to let
+** the input thread know to start things up. In the event
+** of transport IO failure, the output thread will post a
+** SYNC(0,0) message to ensure shutdown.
+**
+** The transport will not actually be closed until both
+** threads exit, but the input thread will kick the transport
+** on its way out to disconnect the underlying device.
+*/
+
+static void *output_thread(void *_t)
+{
+ atransport *t = _t;
+ apacket *p;
+
+ D("from_remote: starting thread for transport %p, on fd %d\n", t, t->fd );
+
+ D("from_remote: transport %p SYNC online (%d)\n", t, t->sync_token + 1);
+ p = get_apacket();
+ p->msg.command = A_SYNC;
+ p->msg.arg0 = 1;
+ p->msg.arg1 = ++(t->sync_token);
+ p->msg.magic = A_SYNC ^ 0xffffffff;
+ if(write_packet(t->fd, &p)) {
+ put_apacket(p);
+ D("from_remote: failed to write SYNC apacket to transport %p", t);
+ goto oops;
+ }
+
+ D("from_remote: data pump for transport %p\n", t);
+ for(;;) {
+ p = get_apacket();
+
+ if(t->read_from_remote(p, t) == 0){
+ D("from_remote: received remote packet, sending to transport %p\n",
+ t);
+ if(write_packet(t->fd, &p)){
+ put_apacket(p);
+ D("from_remote: failed to write apacket to transport %p", t);
+ goto oops;
+ }
+ } else {
+ D("from_remote: remote read failed for transport %p\n", p);
+ put_apacket(p);
+ break;
+ }
+ }
+
+ D("from_remote: SYNC offline for transport %p\n", t);
+ p = get_apacket();
+ p->msg.command = A_SYNC;
+ p->msg.arg0 = 0;
+ p->msg.arg1 = 0;
+ p->msg.magic = A_SYNC ^ 0xffffffff;
+ if(write_packet(t->fd, &p)) {
+ put_apacket(p);
+ D("from_remote: failed to write SYNC apacket to transport %p", t);
+ }
+
+oops:
+ D("from_remote: thread is exiting for transport %p\n", t);
+ kick_transport(t);
+ transport_unref(t);
+ return 0;
+}
+
+static void *input_thread(void *_t)
+{
+ atransport *t = _t;
+ apacket *p;
+ int active = 0;
+
+ D("to_remote: starting input_thread for %p, reading from fd %d\n",
+ t, t->fd);
+
+ for(;;){
+ if(read_packet(t->fd, &p)) {
+ D("to_remote: failed to read apacket from transport %p on fd %d\n",
+ t, t->fd );
+ break;
+ }
+ if(p->msg.command == A_SYNC){
+ if(p->msg.arg0 == 0) {
+ D("to_remote: transport %p SYNC offline\n", t);
+ put_apacket(p);
+ break;
+ } else {
+ if(p->msg.arg1 == t->sync_token) {
+ D("to_remote: transport %p SYNC online\n", t);
+ active = 1;
+ } else {
+ D("to_remote: trandport %p ignoring SYNC %d != %d\n",
+ t, p->msg.arg1, t->sync_token);
+ }
+ }
+ } else {
+ if(active) {
+ D("to_remote: transport %p got packet, sending to remote\n", t);
+ t->write_to_remote(p, t);
+ } else {
+ D("to_remote: transport %p ignoring packet while offline\n", t);
+ }
+ }
+
+ put_apacket(p);
+ }
+
+ // this is necessary to avoid a race condition that occured when a transport closes
+ // while a client socket is still active.
+ close_all_sockets(t);
+
+ D("to_remote: thread is exiting for transport %p, fd %d\n", t, t->fd);
+ kick_transport(t);
+ transport_unref(t);
+ return 0;
+}
+
+
+static int transport_registration_send = -1;
+static int transport_registration_recv = -1;
+static fdevent transport_registration_fde;
+
+
+#if ADB_HOST
+static int list_transports_msg(char* buffer, size_t bufferlen)
+{
+ char head[5];
+ int len;
+
+ len = list_transports(buffer+4, bufferlen-4);
+ snprintf(head, sizeof(head), "%04x", len);
+ memcpy(buffer, head, 4);
+ len += 4;
+ return len;
+}
+
+/* this adds support required by the 'track-devices' service.
+ * this is used to send the content of "list_transport" to any
+ * number of client connections that want it through a single
+ * live TCP connection
+ */
+typedef struct device_tracker device_tracker;
+struct device_tracker {
+ asocket socket;
+ int update_needed;
+ device_tracker* next;
+};
+
+/* linked list of all device trackers */
+static device_tracker* device_tracker_list;
+
+static void
+device_tracker_remove( device_tracker* tracker )
+{
+ device_tracker** pnode = &device_tracker_list;
+ device_tracker* node = *pnode;
+
+ adb_mutex_lock( &transport_lock );
+ while (node) {
+ if (node == tracker) {
+ *pnode = node->next;
+ break;
+ }
+ pnode = &node->next;
+ node = *pnode;
+ }
+ adb_mutex_unlock( &transport_lock );
+}
+
+static void
+device_tracker_close( asocket* socket )
+{
+ device_tracker* tracker = (device_tracker*) socket;
+ asocket* peer = socket->peer;
+
+ D( "device tracker %p removed\n", tracker);
+ if (peer) {
+ peer->peer = NULL;
+ peer->close(peer);
+ }
+ device_tracker_remove(tracker);
+ free(tracker);
+}
+
+static int
+device_tracker_enqueue( asocket* socket, apacket* p )
+{
+ /* you can't read from a device tracker, close immediately */
+ put_apacket(p);
+ device_tracker_close(socket);
+ return -1;
+}
+
+static int
+device_tracker_send( device_tracker* tracker,
+ const char* buffer,
+ int len )
+{
+ apacket* p = get_apacket();
+ asocket* peer = tracker->socket.peer;
+
+ memcpy(p->data, buffer, len);
+ p->len = len;
+ return peer->enqueue( peer, p );
+}
+
+
+static void
+device_tracker_ready( asocket* socket )
+{
+ device_tracker* tracker = (device_tracker*) socket;
+
+ /* we want to send the device list when the tracker connects
+ * for the first time, even if no update occured */
+ if (tracker->update_needed > 0) {
+ char buffer[1024];
+ int len;
+
+ tracker->update_needed = 0;
+
+ len = list_transports_msg(buffer, sizeof(buffer));
+ device_tracker_send(tracker, buffer, len);
+ }
+}
+
+
+asocket*
+create_device_tracker(void)
+{
+ device_tracker* tracker = calloc(1,sizeof(*tracker));
+
+ if(tracker == 0) fatal("cannot allocate device tracker");
+
+ D( "device tracker %p created\n", tracker);
+
+ tracker->socket.enqueue = device_tracker_enqueue;
+ tracker->socket.ready = device_tracker_ready;
+ tracker->socket.close = device_tracker_close;
+ tracker->update_needed = 1;
+
+ tracker->next = device_tracker_list;
+ device_tracker_list = tracker;
+
+ return &tracker->socket;
+}
+
+
+/* call this function each time the transport list has changed */
+void update_transports(void)
+{
+ char buffer[1024];
+ int len;
+ device_tracker* tracker;
+
+ len = list_transports_msg(buffer, sizeof(buffer));
+
+ tracker = device_tracker_list;
+ while (tracker != NULL) {
+ device_tracker* next = tracker->next;
+ /* note: this may destroy the tracker if the connection is closed */
+ device_tracker_send(tracker, buffer, len);
+ tracker = next;
+ }
+}
+#else
+void update_transports(void)
+{
+ // nothing to do on the device side
+}
+#endif // ADB_HOST
+
+typedef struct tmsg tmsg;
+struct tmsg
+{
+ atransport *transport;
+ int action;
+};
+
+static int
+transport_read_action(int fd, struct tmsg* m)
+{
+ char *p = (char*)m;
+ int len = sizeof(*m);
+ int r;
+
+ while(len > 0) {
+ r = adb_read(fd, p, len);
+ if(r > 0) {
+ len -= r;
+ p += r;
+ } else {
+ if((r < 0) && (errno == EINTR)) continue;
+ D("transport_read_action: on fd %d, error %d: %s\n",
+ fd, errno, strerror(errno));
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static int
+transport_write_action(int fd, struct tmsg* m)
+{
+ char *p = (char*)m;
+ int len = sizeof(*m);
+ int r;
+
+ while(len > 0) {
+ r = adb_write(fd, p, len);
+ if(r > 0) {
+ len -= r;
+ p += r;
+ } else {
+ if((r < 0) && (errno == EINTR)) continue;
+ D("transport_write_action: on fd %d, error %d: %s\n",
+ fd, errno, strerror(errno));
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static void transport_registration_func(int _fd, unsigned ev, void *data)
+{
+ tmsg m;
+ adb_thread_t output_thread_ptr;
+ adb_thread_t input_thread_ptr;
+ int s[2];
+ atransport *t;
+
+ if(!(ev & FDE_READ)) {
+ return;
+ }
+
+ if(transport_read_action(_fd, &m)) {
+ fatal_errno("cannot read transport registration socket");
+ }
+
+ t = m.transport;
+
+ if(m.action == 0){
+ D("transport: %p removing and free'ing %d\n", t, t->transport_socket);
+
+ /* IMPORTANT: the remove closes one half of the
+ ** socket pair. The close closes the other half.
+ */
+ fdevent_remove(&(t->transport_fde));
+ adb_close(t->fd);
+
+ adb_mutex_lock(&transport_lock);
+ t->next->prev = t->prev;
+ t->prev->next = t->next;
+ adb_mutex_unlock(&transport_lock);
+
+ run_transport_disconnects(t);
+
+ if (t->product)
+ free(t->product);
+ if (t->serial)
+ free(t->serial);
+
+ memset(t,0xee,sizeof(atransport));
+ free(t);
+
+ update_transports();
+ return;
+ }
+
+ /* initial references are the two threads */
+ t->ref_count = 2;
+
+ if(adb_socketpair(s)) {
+ fatal_errno("cannot open transport socketpair");
+ }
+
+ D("transport: %p (%d,%d) starting\n", t, s[0], s[1]);
+
+ t->transport_socket = s[0];
+ t->fd = s[1];
+
+ /* put us on the master device list */
+ adb_mutex_lock(&transport_lock);
+ t->next = &transport_list;
+ t->prev = transport_list.prev;
+ t->next->prev = t;
+ t->prev->next = t;
+ adb_mutex_unlock(&transport_lock);
+
+ D("transport: %p install %d\n", t, t->transport_socket );
+ fdevent_install(&(t->transport_fde),
+ t->transport_socket,
+ transport_socket_events,
+ t);
+
+ fdevent_set(&(t->transport_fde), FDE_READ);
+
+ if(adb_thread_create(&input_thread_ptr, input_thread, t)){
+ fatal_errno("cannot create input thread");
+ }
+
+ if(adb_thread_create(&output_thread_ptr, output_thread, t)){
+ fatal_errno("cannot create output thread");
+ }
+
+ t->disconnects.next = t->disconnects.prev = &t->disconnects;
+
+ update_transports();
+}
+
+void init_transport_registration(void)
+{
+ int s[2];
+
+ if(adb_socketpair(s)){
+ fatal_errno("cannot open transport registration socketpair");
+ }
+
+ transport_registration_send = s[0];
+ transport_registration_recv = s[1];
+
+ fdevent_install(&transport_registration_fde,
+ transport_registration_recv,
+ transport_registration_func,
+ 0);
+
+ fdevent_set(&transport_registration_fde, FDE_READ);
+}
+
+/* the fdevent select pump is single threaded */
+static void register_transport(atransport *transport)
+{
+ tmsg m;
+ m.transport = transport;
+ m.action = 1;
+ D("transport: %p registered\n", transport);
+ if(transport_write_action(transport_registration_send, &m)) {
+ fatal_errno("cannot write transport registration socket\n");
+ }
+}
+
+static void remove_transport(atransport *transport)
+{
+ tmsg m;
+ m.transport = transport;
+ m.action = 0;
+ D("transport: %p removed\n", transport);
+ if(transport_write_action(transport_registration_send, &m)) {
+ fatal_errno("cannot write transport registration socket\n");
+ }
+}
+
+
+static void transport_unref(atransport *t)
+{
+ if (t) {
+ adb_mutex_lock(&transport_lock);
+ t->ref_count--;
+ D("transport: %p R- (ref=%d)\n", t, t->ref_count);
+ if (t->ref_count == 0) {
+ D("transport: %p kicking and closing\n", t);
+ if (!t->kicked) {
+ t->kicked = 1;
+ t->kick(t);
+ }
+ t->close(t);
+ remove_transport(t);
+ }
+ adb_mutex_unlock(&transport_lock);
+ }
+}
+
+void add_transport_disconnect(atransport* t, adisconnect* dis)
+{
+ adb_mutex_lock(&transport_lock);
+ dis->next = &t->disconnects;
+ dis->prev = dis->next->prev;
+ dis->prev->next = dis;
+ dis->next->prev = dis;
+ adb_mutex_unlock(&transport_lock);
+}
+
+void remove_transport_disconnect(atransport* t, adisconnect* dis)
+{
+ dis->prev->next = dis->next;
+ dis->next->prev = dis->prev;
+ dis->next = dis->prev = dis;
+}
+
+
+atransport *acquire_one_transport(int state, transport_type ttype, const char* serial, char** error_out)
+{
+ atransport *t;
+ atransport *result = NULL;
+ int ambiguous = 0;
+
+retry:
+ if (error_out)
+ *error_out = "device not found";
+
+ adb_mutex_lock(&transport_lock);
+ for (t = transport_list.next; t != &transport_list; t = t->next) {
+ /* check for matching serial number */
+ if (serial) {
+ if (t->serial && !strcmp(serial, t->serial)) {
+ result = t;
+ break;
+ }
+ } else {
+ if (ttype == kTransportUsb && t->type == kTransportUsb) {
+ if (result) {
+ if (error_out)
+ *error_out = "more than one device";
+ ambiguous = 1;
+ result = NULL;
+ break;
+ }
+ result = t;
+ } else if (ttype == kTransportLocal && t->type == kTransportLocal) {
+ if (result) {
+ if (error_out)
+ *error_out = "more than one emulator";
+ ambiguous = 1;
+ result = NULL;
+ break;
+ }
+ result = t;
+ } else if (ttype == kTransportAny) {
+ if (result) {
+ if (error_out)
+ *error_out = "more than one device and emulator";
+ ambiguous = 1;
+ result = NULL;
+ break;
+ }
+ result = t;
+ }
+ }
+ }
+ adb_mutex_unlock(&transport_lock);
+
+ if (result) {
+ /* offline devices are ignored -- they are either being born or dying */
+ if (result && result->connection_state == CS_OFFLINE) {
+ if (error_out)
+ *error_out = "device offline";
+ result = NULL;
+ }
+
+ /* check for required connection state */
+ if (result && state != CS_ANY && result->connection_state != state) {
+ if (error_out)
+ *error_out = "invalid device state";
+ result = NULL;
+ }
+ }
+
+ if (result) {
+ /* found one that we can take */
+ if (error_out)
+ *error_out = NULL;
+ } else if (state != CS_ANY && (serial || !ambiguous)) {
+ adb_sleep_ms(1000);
+ goto retry;
+ }
+
+ return result;
+}
+
+#if ADB_HOST
+static const char *statename(atransport *t)
+{
+ switch(t->connection_state){
+ case CS_OFFLINE: return "offline";
+ case CS_BOOTLOADER: return "bootloader";
+ case CS_DEVICE: return "device";
+ case CS_HOST: return "host";
+ case CS_RECOVERY: return "recovery";
+ default: return "unknown";
+ }
+}
+
+int list_transports(char *buf, size_t bufsize)
+{
+ char* p = buf;
+ char* end = buf + bufsize;
+ int len;
+ atransport *t;
+
+ /* XXX OVERRUN PROBLEMS XXX */
+ adb_mutex_lock(&transport_lock);
+ for(t = transport_list.next; t != &transport_list; t = t->next) {
+ len = snprintf(p, end - p, "%s\t%s\n",
+ t->serial ? t->serial : "",
+ statename(t));
+
+ if (p + len >= end) {
+ /* discard last line if buffer is too short */
+ break;
+ }
+ p += len;
+ }
+ p[0] = 0;
+ adb_mutex_unlock(&transport_lock);
+ return p - buf;
+}
+
+
+/* hack for osx */
+void close_usb_devices()
+{
+ atransport *t;
+
+ adb_mutex_lock(&transport_lock);
+ for(t = transport_list.next; t != &transport_list; t = t->next) {
+ if ( !t->kicked ) {
+ t->kicked = 1;
+ t->kick(t);
+ }
+ }
+ adb_mutex_unlock(&transport_lock);
+}
+#endif // ADB_HOST
+
+void register_socket_transport(int s, const char *serial, int port)
+{
+ atransport *t = calloc(1, sizeof(atransport));
+ D("transport: %p init'ing for socket %d, on port %d\n", t, s, port);
+ if ( init_socket_transport(t, s, port) < 0 ) {
+ adb_close(s);
+ free(t);
+ return;
+ }
+ if(serial) {
+ t->serial = strdup(serial);
+ }
+ register_transport(t);
+}
+
+void register_usb_transport(usb_handle *usb, const char *serial)
+{
+ atransport *t = calloc(1, sizeof(atransport));
+ D("transport: %p init'ing for usb_handle %p (sn='%s')\n", t, usb,
+ serial ? serial : "");
+ init_usb_transport(t, usb);
+ if(serial) {
+ t->serial = strdup(serial);
+ }
+ register_transport(t);
+}
+
+
+#undef TRACE_TAG
+#define TRACE_TAG TRACE_RWX
+
+int readx(int fd, void *ptr, size_t len)
+{
+ char *p = ptr;
+ int r;
+#if ADB_TRACE
+ int len0 = len;
+#endif
+ D("readx: %d %p %d\n", fd, ptr, (int)len);
+ while(len > 0) {
+ r = adb_read(fd, p, len);
+ if(r > 0) {
+ len -= r;
+ p += r;
+ } else {
+ D("readx: %d %d %s\n", fd, r, strerror(errno));
+ if((r < 0) && (errno == EINTR)) continue;
+ return -1;
+ }
+ }
+
+#if ADB_TRACE
+ D("readx: %d ok: ", fd);
+ dump_hex( ptr, len0 );
+#endif
+ return 0;
+}
+
+int writex(int fd, const void *ptr, size_t len)
+{
+ char *p = (char*) ptr;
+ int r;
+
+#if ADB_TRACE
+ D("writex: %d %p %d: ", fd, ptr, (int)len);
+ dump_hex( ptr, len );
+#endif
+ while(len > 0) {
+ r = adb_write(fd, p, len);
+ if(r > 0) {
+ len -= r;
+ p += r;
+ } else {
+ D("writex: %d %d %s\n", fd, r, strerror(errno));
+ if((r < 0) && (errno == EINTR)) continue;
+ return -1;
+ }
+ }
+
+ D("writex: %d ok\n", fd);
+ return 0;
+}
+
+int check_header(apacket *p)
+{
+ if(p->msg.magic != (p->msg.command ^ 0xffffffff)) {
+ D("check_header(): invalid magic\n");
+ return -1;
+ }
+
+ if(p->msg.data_length > MAX_PAYLOAD) {
+ D("check_header(): %d > MAX_PAYLOAD\n", p->msg.data_length);
+ return -1;
+ }
+
+ return 0;
+}
+
+int check_data(apacket *p)
+{
+ unsigned count, sum;
+ unsigned char *x;
+
+ count = p->msg.data_length;
+ x = p->data;
+ sum = 0;
+ while(count-- > 0) {
+ sum += *x++;
+ }
+
+ if(sum != p->msg.data_check) {
+ return -1;
+ } else {
+ return 0;
+ }
+}
+