Commit 5564ba70 authored by Matt Colyer's avatar Matt Colyer

Massive AFC cleanup, started with Zach's documentation.

parent 818fcb03
......@@ -19,122 +19,182 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include "AFC.h"
#include "plist.h"
// This is the maximum size an AFC data packet can be
const int MAXIMUM_PACKET_SIZE = (2 << 15) - 32;
extern int debug;
/* Locking, for thread-safety (well... kind of, hehe) */
/** Locks an AFC client, done for thread safety stuff
*
* @param client The AFC client connection to lock
*/
static void afc_lock(AFClient *client) {
if (debug) printf("In the midst of a lock...\n");
if (debug) fprintf(stderr, "Locked\n");
while (client->lock) {
usleep(500); // they say it's obsolete, but whatever
}
client->lock = 1;
}
/** Unlocks an AFC client, done for thread safety stuff.
*
* @param client The AFC
*/
static void afc_unlock(AFClient *client) { // just to be pretty
if (debug) printf("Unlock!\n");
if (debug) fprintf(stderr, "Unlocked\n");
client->lock = 0;
}
/* main AFC functions */
/** Makes a connection to the AFC service on the phone.
*
* @param phone The iPhone to connect on.
* @param s_port The source port.
* @param d_port The destination port.
*
* @return A handle to the newly-connected client or NULL upon error.
*/
AFClient *afc_connect(iPhone *phone, int s_port, int d_port) {
if (!phone) return NULL;
AFClient *client = (AFClient*)malloc(sizeof(AFClient));
if (!phone) return NULL;
// Attempt connection
client->connection = mux_connect(phone, s_port, d_port);
if (!client->connection) { free(client); return NULL; }
else {
client->afc_packet = (AFCPacket*)malloc(sizeof(AFCPacket));
if (client->afc_packet) {
client->afc_packet->packet_num = 0;
client->afc_packet->unknown1 = client->afc_packet->unknown2 = client->afc_packet->unknown3 = client->afc_packet->unknown4 = client->afc_packet->entire_length = client->afc_packet->this_length = 0;
client->afc_packet->header1 = 0x36414643;
client->afc_packet->header2 = 0x4141504C;
client->file_handle = 0;
client->lock = 0;
return client;
} else {
mux_close_connection(client->connection);
free(client);
return NULL;
}
if (!client->connection) {
free(client);
return NULL;
}
return NULL; // should never get to this point
// Allocate a packet
client->afc_packet = (AFCPacket*)malloc(sizeof(AFCPacket));
if (!client->afc_packet) {
mux_close_connection(client->connection);
free(client);
return NULL;
}
client->afc_packet->packet_num = 0;
client->afc_packet->unknown1 = 0;
client->afc_packet->unknown2 = 0;
client->afc_packet->unknown3 = 0;
client->afc_packet->unknown4 = 0;
client->afc_packet->entire_length = 0;
client->afc_packet->this_length = 0;
client->afc_packet->header1 = 0x36414643;
client->afc_packet->header2 = 0x4141504C;
client->file_handle = 0;
client->lock = 0;
return client;
}
/** Disconnects an AFC client from the phone.
*
* @param client The client to disconnect.
*/
void afc_disconnect(AFClient *client) {
// client and its members should never be NULL is assumed here.
if (!client || !client->connection || !client->afc_packet) return;
mux_close_connection(client->connection);
free(client->afc_packet);
free(client);
}
static int count_nullspaces(char *string, int number) {
int i = 0, nulls = 0;
for (i = 0; i < number; i++) {
if (string[i] == '\0') nulls++;
}
return nulls;
}
/** Dispatches an AFC packet over a client.
*
* @param client The client to send data through.
* @param data The data to send.
* @param length The length to send.
*
* @return The number of bytes actually sent, or -1 on error.
*
* @warning set client->afc_packet->this_length and
* client->afc_packet->entire_length to 0 before calling this. The
* reason is that if you set them to different values, it indicates
* you want to send the data as two packets.
*/
static int dispatch_AFC_packet(AFClient *client, const char *data, int length) {
int bytes = 0, offset = 0;
char *buffer;
if (!client || !client->connection || !client->afc_packet) return 0;
if (!data || !length) length = 0;
client->afc_packet->packet_num++;
if (!client->afc_packet->entire_length) client->afc_packet->entire_length = client->afc_packet->this_length = (length) ? sizeof(AFCPacket) + length + 1 : sizeof(AFCPacket);
if (!client->afc_packet->this_length) client->afc_packet->this_length = sizeof(AFCPacket);
if (!client->afc_packet->entire_length) {
client->afc_packet->entire_length = (length) ? sizeof(AFCPacket) + length + 1 : sizeof(AFCPacket);
client->afc_packet->this_length = client->afc_packet->entire_length;
}
if (!client->afc_packet->this_length){
client->afc_packet->this_length = sizeof(AFCPacket);
}
// We want to send two segments; buffer+sizeof(AFCPacket) to this_length is the parameters
// And everything beyond that is the next packet. (for writing)
if (client->afc_packet->this_length != client->afc_packet->entire_length) {
// We want to send two segments; buffer+sizeof(AFCPacket) to this_length is the parameters
// And everything beyond that is the next packet. (for writing)
char *buffer = (char*)malloc(client->afc_packet->this_length);
buffer = (char*)malloc(client->afc_packet->this_length);
memcpy(buffer, (char*)client->afc_packet, sizeof(AFCPacket));
offset = client->afc_packet->this_length - sizeof(AFCPacket);
if (debug) printf("dispatch_AFC_packet: Offset: %i\n", offset);
if (debug) fprintf(stderr, "dispatch_AFC_packet: Offset: %i\n", offset);
if ((length) < (client->afc_packet->entire_length - client->afc_packet->this_length)) {
if (debug) printf("dispatch_AFC_packet: Length did not resemble what it was supposed to based on the packet.\nlength minus offset: %i\nrest of packet: %i\n", length-offset, client->afc_packet->entire_length - client->afc_packet->this_length);
if (debug){
fprintf(stderr, "dispatch_AFC_packet: Length did not resemble what it was supposed");
fprintf(stderr, "to based on the packet.\n");
fprintf(stderr, "length minus offset: %i\n", length-offset);
fprintf(stderr, "rest of packet: %i\n", client->afc_packet->entire_length - client->afc_packet->this_length);
}
free(buffer);
return -1;
}
if (debug) printf("dispatch_AFC_packet: fucked-up packet method (probably a write)\n");
memcpy(buffer+sizeof(AFCPacket), data, offset);
bytes = mux_send(client->connection, buffer, client->afc_packet->this_length);
free(buffer);
if (bytes <= 0) { return bytes; }
if (bytes <= 0) {
return bytes;
}
if (debug) {
printf("dispatch_AFC_packet: sent the first now go with the second\n");
printf("Length: %i\n", length-offset);
printf("Buffer: \n");
fprintf(stderr, "dispatch_AFC_packet: sent the first now go with the second\n");
fprintf(stderr, "Length: %i\n", length-offset);
fprintf(stderr, "Buffer: \n");
fwrite(data+offset, 1, length-offset, stdout);
}
bytes = mux_send(client->connection, data+offset, length-offset);
return bytes;
} else {
if (debug) printf("dispatch_AFC_packet doin things the old way\n");
if (debug) fprintf(stderr, "dispatch_AFC_packet doin things the old way\n");
char *buffer = (char*)malloc(sizeof(char) * client->afc_packet->this_length);
if (debug) printf("dispatch_AFC_packet packet length = %i\n", client->afc_packet->this_length);
if (debug) fprintf(stderr, "dispatch_AFC_packet packet length = %i\n", client->afc_packet->this_length);
memcpy(buffer, (char*)client->afc_packet, sizeof(AFCPacket));
if (debug) printf("dispatch_AFC_packet packet data follows\n");
if (debug) fprintf(stderr, "dispatch_AFC_packet packet data follows\n");
if (length > 0) { memcpy(buffer+sizeof(AFCPacket), data, length); buffer[sizeof(AFCPacket)+length] = '\0'; }
if (debug) fwrite(buffer, 1, client->afc_packet->this_length, stdout);
if (debug) printf("\n");
if (debug) fprintf(stderr, "\n");
bytes = mux_send(client->connection, buffer, client->afc_packet->this_length);
return bytes;
}
return -1;
}
/** Receives data through an AFC client and sets a variable to the received data.
*
* @param client The client to receive data on.
* @param dump_here The char* to point to the newly-received data.
*
* @return How much data was received, 0 on successful receive with no errors,
* -1 if there was an error involved with receiving or if the packet
* received raised a non-trivial error condition (i.e. non-zero with
* AFC_ERROR operation)
*/
static int receive_AFC_data(AFClient *client, char **dump_here) {
AFCPacket *r_packet;
char *buffer = (char*)malloc(sizeof(AFCPacket) * 4);
......@@ -145,7 +205,7 @@ static int receive_AFC_data(AFClient *client, char **dump_here) {
bytes = mux_recv(client->connection, buffer, sizeof(AFCPacket) * 4);
if (bytes <= 0) {
free(buffer);
printf("Just didn't get enough.\n");
fprintf(stderr, "Just didn't get enough.\n");
*dump_here = NULL;
return -1;
}
......@@ -165,25 +225,22 @@ static int receive_AFC_data(AFClient *client, char **dump_here) {
uint32 param1 = buffer[sizeof(AFCPacket)];
free(buffer);
if (r_packet->operation == AFC_ERROR
&& !(client->afc_packet->operation == AFC_DELETE && param1 == 7)
)
{
if (debug) printf("Oops? Bad operation code received: 0x%X, operation=0x%X, param1=%d\n",
if (r_packet->operation == AFC_ERROR && !(client->afc_packet->operation == AFC_DELETE && param1 == 7)) {
if (debug) fprintf(stderr, "Oops? Bad operation code received: 0x%X, operation=0x%X, param1=%d\n",
r_packet->operation, client->afc_packet->operation, param1);
recv_len = r_packet->entire_length - r_packet->this_length;
if (debug) printf("recv_len=%d\n", recv_len);
if (debug) fprintf(stderr, "recv_len=%d\n", recv_len);
if(param1 == 0) {
if (debug) printf("... false alarm, but still\n");
if (debug) fprintf(stderr, "... false alarm, but still\n");
*dump_here = NULL;
return 0;
}
else { if (debug) printf("Errno %i\n", param1); }
else { if (debug) fprintf(stderr, "Errno %i\n", param1); }
free(r_packet);
*dump_here = NULL;
return -1;
} else {
if (debug) printf("Operation code %x\nFull length %i and this length %i\n", r_packet->operation, r_packet->entire_length, r_packet->this_length);
if (debug) fprintf(stderr, "Operation code %x\nFull length %i and this length %i\n", r_packet->operation, r_packet->entire_length, r_packet->this_length);
}
recv_len = r_packet->entire_length - r_packet->this_length;
......@@ -199,21 +256,20 @@ static int receive_AFC_data(AFClient *client, char **dump_here) {
final_buffer = (char*)malloc(sizeof(char) * recv_len);
while(current_count < recv_len){
bytes = mux_recv(client->connection, buffer, recv_len-current_count);
if (debug) printf("receive_AFC_data: still collecting packets\n");
if (debug) fprintf(stderr, "receive_AFC_data: still collecting packets\n");
if (bytes < 0)
{
if(debug) printf("receive_AFC_data: mux_recv failed: %d\n", bytes);
if(debug) fprintf(stderr, "receive_AFC_data: mux_recv failed: %d\n", bytes);
break;
}
if (bytes > recv_len-current_count)
{
if(debug) printf("receive_AFC_data: mux_recv delivered too much data\n");
if(debug) fprintf(stderr, "receive_AFC_data: mux_recv delivered too much data\n");
break;
}
if (strstr(buffer, "CFA6LPAA")) {
if (debug) printf("receive_AFC_data: WARNING: there is AFC data in this packet at %ti\n", strstr(buffer, "CFA6LPAA") - buffer);
if (debug) printf("receive_AFC_data: the total packet length is %i\n", bytes);
//continue; // but we do need to continue because packets/headers != data
if (debug) fprintf(stderr, "receive_AFC_data: WARNING: there is AFC data in this packet at %ti\n", strstr(buffer, "CFA6LPAA") - buffer);
if (debug) fprintf(stderr, "receive_AFC_data: the total packet length is %i\n", bytes);
}
memcpy(final_buffer+current_count, buffer, bytes);
......@@ -221,22 +277,26 @@ static int receive_AFC_data(AFClient *client, char **dump_here) {
}
free(buffer);
/*if (bytes <= 0) {
free(final_buffer);
printf("Didn't get it at the second pass.\n");
*dump_here = NULL;
return 0;
}*/
*dump_here = final_buffer; // what they do beyond this point = not my problem
*dump_here = final_buffer;
return current_count;
}
static int count_nullspaces(char *string, int number) {
int i = 0, nulls = 0;
for (i = 0; i < number; i++) {
if (string[i] == '\0') nulls++;
}
return nulls;
}
static char **make_strings_list(char *tokens, int true_length) {
if (!tokens || !true_length) return NULL;
int nulls = 0, i = 0, j = 0;
char **list = NULL;
if (!tokens || !true_length) return NULL;
nulls = count_nullspaces(tokens, true_length);
list = (char**)malloc(sizeof(char*) * (nulls + 1));
for (i = 0; i < nulls; i++) {
......@@ -244,118 +304,242 @@ static char **make_strings_list(char *tokens, int true_length) {
j += strlen(list[i]) + 1;
}
list[i] = strdup("");
return list;
}
/** Gets a directory listing of the directory requested.
*
* @param client The client to get a directory listing from.
* @param dir The directory to list. (must be a fully-qualified path)
*
* @return A char ** list of files in that directory, terminated by an empty
* string for now or NULL if there was an error.
*/
char **afc_get_dir_list(AFClient *client, const char *dir) {
int bytes = 0;
char *data = NULL, **list = NULL;
if (!client || !dir) return NULL;
afc_lock(client);
// Send the command
client->afc_packet->operation = AFC_LIST_DIR;
int bytes = 0;
char *blah = NULL, **list = NULL;
client->afc_packet->entire_length = client->afc_packet->this_length = 0;
client->afc_packet->entire_length = 0;
client->afc_packet->this_length = 0;
bytes = dispatch_AFC_packet(client, dir, strlen(dir));
if (bytes <= 0) { afc_unlock(client); return NULL; }
if (bytes <= 0) {
afc_unlock(client);
return NULL;
}
bytes = receive_AFC_data(client, &blah);
if (bytes < 0 && !blah) { afc_unlock(client); return NULL; }
// Receive the data
bytes = receive_AFC_data(client, &data);
if (bytes < 0 && !data) {
afc_unlock(client);
return NULL;
}
list = make_strings_list(blah, bytes);
free(blah);
// Parse the data
list = make_strings_list(data, bytes);
if (data) free(data);
afc_unlock(client);
return list;
}
/** Get device info for a client connection to phone. (free space on disk, etc.)
*
* @param client The client to get device info for.
*
* @return A char ** list of parameters as given by AFC or NULL if there was an
* error.
*/
char **afc_get_devinfo(AFClient *client) {
int bytes = 0;
char *data = NULL, **list = NULL;
if (!client) return NULL;
afc_lock(client);
// Send the command
client->afc_packet->operation = AFC_GET_DEVINFO;
int bytes = 0;
char *blah = NULL, **list = NULL;
client->afc_packet->entire_length = client->afc_packet->this_length = 0;
bytes = dispatch_AFC_packet(client, NULL, 0);
if (bytes < 0) { afc_unlock(client); return NULL; }
if (bytes < 0) {
afc_unlock(client);
return NULL;
}
bytes = receive_AFC_data(client, &blah);
if (bytes < 0 && !blah) { afc_unlock(client); return NULL; }
// Receive the data
bytes = receive_AFC_data(client, &data);
if (bytes < 0 && !data) {
afc_unlock(client);
return NULL;
}
// Parse the data
list = make_strings_list(data, bytes);
if (data) free(data);
list = make_strings_list(blah, bytes);
free(blah);
afc_unlock(client);
return list;
}
/** Deletes a file.
*
* @param client The client to have delete the file.
* @param path The file to delete. (must be a fully-qualified path)
*
* @return 1 on success, 0 on failure.
*/
int afc_delete_file(AFClient *client, const char *path) {
char *response = NULL;
int bytes;
if (!client || !path || !client->afc_packet || !client->connection) return 0;
afc_lock(client);
char *receive = NULL;
// Send command
client->afc_packet->this_length = client->afc_packet->entire_length = 0;
client->afc_packet->operation = AFC_DELETE;
int bytes;
bytes = dispatch_AFC_packet(client, path, strlen(path));
if (bytes <= 0) { afc_unlock(client); return 0; }
if (bytes <= 0) {
afc_unlock(client);
return 0;
}
// Receive response
bytes = receive_AFC_data(client, &response);
if (response) free(response);
bytes = receive_AFC_data(client, &receive);
free(receive);
afc_unlock(client);
if (bytes < 0) { return 0; }
else return 1;
if (bytes < 0) {
return 0;
} else {
return 1;
}
}
/** Renames a file on the phone.
*
* @param client The client to have rename the file.
* @param from The file to rename. (must be a fully-qualified path)
* @param to The new name of the file. (must also be a fully-qualified path)
*
* @return 1 on success, 0 on failure.
*/
int afc_rename_file(AFClient *client, const char *from, const char *to) {
if (!client || !from || !to || !client->afc_packet || !client->connection) return 0;
afc_lock(client);
char *receive = NULL;
char *response = NULL;
char *send = (char*)malloc(sizeof(char) * (strlen(from) + strlen(to) + 1 + sizeof(uint32)));
int bytes = 0;
if (!client || !from || !to || !client->afc_packet || !client->connection) return 0;
afc_lock(client);
// Send command
memcpy(send, from, strlen(from)+1);
memcpy(send+strlen(from)+1, to, strlen(to));
fwrite(send, 1, strlen(from)+1+strlen(to), stdout);
printf("\n");
client->afc_packet->entire_length = client->afc_packet->this_length = 0;
client->afc_packet->operation = AFC_RENAME;
bytes = dispatch_AFC_packet(client, send, strlen(to) + strlen(from) + 2);
if (bytes <= 0) { afc_unlock(client); return 0; }
if (bytes <= 0) {
afc_unlock(client);
return 0;
}
bytes = receive_AFC_data(client, &receive);
free(receive);
// Receive response
bytes = receive_AFC_data(client, &response);
if (response) free(response);
afc_unlock(client);
if (bytes < 0) return 0;
else return 1;
if (bytes < 0) {
return 0;
} else {
return 1;
}
}
/** Creates a directory on the phone.
*
* @param client The client to use to make a directory.
* @param dir The directory's path. (must be a fully-qualified path, I assume
* all other mkdir restrictions apply as well)
*
* @return 1 on success, 0 on failure.
*/
int afc_mkdir(AFClient *client, const char *dir) {
int bytes = 0;
char *response = NULL;
if (!client) return 0;
afc_lock(client);
int bytes = 0;
char *recvd = NULL;
// Send command
client->afc_packet->operation = AFC_MAKE_DIR;
client->afc_packet->this_length = client->afc_packet->entire_length = 0;
bytes = dispatch_AFC_packet(client, dir, strlen(dir));
if (bytes <= 0) { afc_unlock(client); return 0; }
if (bytes <= 0) {
afc_unlock(client);
return 0;
}
bytes = receive_AFC_data(client, &recvd);
// Receive response
bytes = receive_AFC_data(client, &response);
if (response) free(response);
afc_unlock(client);
if (recvd) { free(recvd); recvd = NULL; }
if (bytes == 0) return 1;
else return 0;
if (bytes == 0) {
return 1;
} else {
return 0;
}
}
/** Gets information about a specific file.
*
* @param client The client to use to get the information of the file.
* @param path The fully-qualified path to the file.
*
* @return A pointer to an AFCFile struct containing the information received,
* or NULL on failure.
*/
AFCFile *afc_get_file_info(AFClient *client, const char *path) {
client->afc_packet->operation = AFC_GET_INFO;
client->afc_packet->entire_length = client->afc_packet->this_length = 0;
afc_lock(client);
dispatch_AFC_packet(client, path, strlen(path));
char *received, **list;
AFCFile *my_file;
int length, i = 0;
afc_lock(client);
// Send command
client->afc_packet->operation = AFC_GET_INFO;
client->afc_packet->entire_length = client->afc_packet->this_length = 0;
dispatch_AFC_packet(client, path, strlen(path));
// Receive data
length = receive_AFC_data(client, &received);
list = make_strings_list(received, length);
free(received);
afc_unlock(client); // the rest is just interpretation anyway
if (received) {
list = make_strings_list(received, length);
free(received);
} else {
afc_unlock(client);
return NULL;
}
afc_unlock(client);
// Parse the data
if (list) {
my_file = (AFCFile *)malloc(sizeof(AFCFile));
for (i = 0; strcmp(list[i], ""); i++) {
......@@ -383,42 +567,62 @@ AFCFile *afc_get_file_info(AFClient *client, const char *path) {
}
}
/** Opens a file on the phone.
*
* @param client The client to use to open the file.
* @param filename The file to open. (must be a fully-qualified path)
* @param file_mode The mode to use to open the file. Can be AFC_FILE_READ or
* AFC_FILE_WRITE; the former lets you read and write,
* however, and the second one will *create* the file,
* destroying anything previously there.
*
* @return A pointer to an AFCFile struct containing the file information (as
* received by afc_get_file_info) as well as the handle to the file or
* NULL in the case of failure.
*/
AFCFile *afc_open_file(AFClient *client, const char *filename, uint32 file_mode) {
//if (file_mode != AFC_FILE_READ && file_mode != AFC_FILE_WRITE) return NULL;
if (!client ||!client->connection || !client->afc_packet) return NULL;
afc_lock(client);
char *further_data = (char*)malloc(sizeof(char) * (8 + strlen(filename) + 1));
AFCFile *file_infos = NULL;
memcpy(further_data, &file_mode, 4);
uint32 ag = 0;
memcpy(further_data+4, &ag, 4);
memcpy(further_data+8, filename, strlen(filename));
further_data[8+strlen(filename)] = '\0';
int bytes = 0, length_thing = 0;
client->afc_packet->operation = AFC_FILE_OPEN;
int bytes = 0, length = 0;
char *data = (char*)malloc(sizeof(char) * (8 + strlen(filename) + 1));
if (!client ||!client->connection || !client->afc_packet) return NULL;
afc_lock(client);
// Send command
memcpy(data, &file_mode, 4);
memcpy(data+4, &ag, 4);
memcpy(data+8, filename, strlen(filename));
data[8+strlen(filename)] = '\0';
client->afc_packet->operation = AFC_FILE_OPEN;
client->afc_packet->entire_length = client->afc_packet->this_length = 0;
bytes = dispatch_AFC_packet(client, further_data, 8+strlen(filename));
free(further_data);
bytes = dispatch_AFC_packet(client, data, 8+strlen(filename));
free(data);
if (bytes <= 0) {
if (debug) printf("didn't read enough\n");
if (debug) fprintf(stderr, "afc_open_file: Didn't receive a response to the command\n");
afc_unlock(client);
return NULL;
}
// Receive the data
length = receive_AFC_data(client, &data);
if (length > 0 && data) {
afc_unlock(client);
// Get the file info and return it
file_infos = afc_get_file_info(client, filename);
memcpy(&file_infos->filehandle, data, 4);
return file_infos;
} else {
length_thing = receive_AFC_data(client, &further_data);
if (length_thing > 0 && further_data) {
afc_unlock(client); // don't want to hang on the next call... and besides, it'll re-lock, do its thing, and unlock again anyway.
file_infos = afc_get_file_info(client, filename);
memcpy(&file_infos->filehandle, further_data, 4);
return file_infos;
} else {
if (debug) printf("didn't get further data or something\n");
afc_unlock(client);
return NULL;
}
if (debug) fprintf(stderr, "afc_open_file: Didn't get any further data\n");
afc_unlock(client);
return NULL;
}
if (debug) printf("what the fuck\n");
afc_unlock(client);
return NULL;
}
......@@ -429,22 +633,21 @@ AFCFile *afc_open_file(AFClient *client, const char *filename, uint32 file_mode)
* @param data The pointer to the memory region to store the read data
* @param length The number of bytes to read
*
* @return The number of bytes read if successful. If there was an error
* @return The number of bytes read if successful. If there was an error -1.
*/
int afc_read_file(AFClient *client, AFCFile *file, char *data, int length) {
if (!client || !client->afc_packet || !client->connection || !file) return -1;
if (debug) printf("afc_read_file called for length %i\n", length);
char *input = NULL;
int current_count = 0, bytes = 0;
const int MAXIMUM_READ_SIZE = 1 << 16;
afc_lock(client);
if (!client || !client->afc_packet || !client->connection || !file) return -1;
if (debug) fprintf(stderr, "afc_read_file called for length %i\n", length);
afc_lock(client);
// Looping here to get around the maximum amount of data that recieve_AFC_data can handle
while (current_count < length){
if (debug) printf("afc_read_file: current count is %i but length is %i\n", current_count, length);
if (debug) fprintf(stderr, "afc_read_file: current count is %i but length is %i\n", current_count, length);
// Send the read command
AFCFilePacket *packet = (AFCFilePacket*)malloc(sizeof(AFCFilePacket));
......@@ -455,120 +658,182 @@ int afc_read_file(AFClient *client, AFCFile *file, char *data, int length) {
client->afc_packet->entire_length = client->afc_packet->this_length = 0;
bytes = dispatch_AFC_packet(client, (char*)packet, sizeof(AFCFilePacket));
// If we get a positive reponse to the command gather the data
if (bytes > 0) {
bytes = receive_AFC_data(client, &input);
if (debug) printf("afc_read_file: bytes returned: %i\n", bytes);
if (bytes < 0) {
if (input) free(input);
afc_unlock(client);
return -1;
} else if (bytes == 0) {
if (input) free(input);
afc_unlock(client);
return current_count;
} else {
if (input) {
if (debug) printf("afc_read_file: %d\n", bytes);
memcpy(data+current_count, input, (bytes > length) ? length : bytes);
free(input);
input = NULL;
current_count += (bytes > length) ? length : bytes;
}
}
} else {
if (bytes <= 0) {
afc_unlock(client);
return -1;
}
// Receive the data
bytes = receive_AFC_data(client, &input);
if (debug) fprintf(stderr, "afc_read_file: bytes returned: %i\n", bytes);
if (bytes < 0) {
if (input) free(input);
afc_unlock(client);
return -1;
} else if (bytes == 0) {
if (input) free(input);
afc_unlock(client);
return current_count;
} else {
if (input) {
if (debug) fprintf(stderr, "afc_read_file: %d\n", bytes);
memcpy(data+current_count, input, (bytes > length) ? length : bytes);
free(input);
input = NULL;
current_count += (bytes > length) ? length : bytes;
}
}
}
if (debug) fprintf(stderr, "afc_read_file: returning current_count as %i\n", current_count);
afc_unlock(client);
if (debug) printf("afc_read_file: returning current_count as %i\n", current_count);
return current_count;
}
/** Writes a given number of bytes to a file.
*
* @param client The client to use to write to the file.
* @param file A pointer to an AFCFile struct; serves as the file handle.
* @param data The data to write to the file.
* @param length How much data to write.
*
* @return The number of bytes written to the file, or a value less than 0 if
* none were written...
*/
int afc_write_file(AFClient *client, AFCFile *file, const char *data, int length) {
char *acknowledgement = NULL;
if (!client ||!client->afc_packet || !client->connection || !file) return -1;
afc_lock(client);
if (debug) printf("afc_write_file: Write length: %i\n", length);
const int MAXIMUM_WRITE_SIZE = 1 << 16;
uint32 zero = 0, bytes = 0, segments = (length / MAXIMUM_WRITE_SIZE), current_count = 0, i = 0;
char *out_buffer = NULL;
if (!client ||!client->afc_packet || !client->connection || !file) return -1;
afc_lock(client);
if (debug) fprintf(stderr, "afc_write_file: Write length: %i\n", length);
for (i = 0; i < segments; i++) { // Essentially, yeah, divide it into segments.
// Divide the file into segments.
for (i = 0; i < segments; i++) {
// Send the segment
client->afc_packet->this_length = sizeof(AFCPacket) + 8;
//client->afc_packet->entire_length = client->afc_packet->this_length + length;
client->afc_packet->entire_length = client->afc_packet->this_length + MAXIMUM_WRITE_SIZE;
client->afc_packet->operation = AFC_WRITE;
out_buffer = (char*)malloc(sizeof(char) * client->afc_packet->entire_length - sizeof(AFCPacket));
memcpy(out_buffer, (char*)&file->filehandle, sizeof(uint32));
memcpy(out_buffer+4, (char*)&zero, sizeof(uint32));
memcpy(out_buffer+8, data+current_count, MAXIMUM_WRITE_SIZE);
bytes = dispatch_AFC_packet(client, out_buffer, MAXIMUM_WRITE_SIZE + 8);
if (bytes < 0) { afc_unlock(client); return bytes; }
free(out_buffer); out_buffer = NULL; // cleanup and hope it works
if (bytes < 0) {
afc_unlock(client);
return bytes;
}
free(out_buffer);
out_buffer = NULL;
current_count += bytes;
bytes = receive_AFC_data(client, &acknowledgement);
if (bytes < 0) { afc_unlock(client); return current_count; }
if (bytes < 0) {
afc_unlock(client);
return current_count;
}
}
// By this point, we should be at the end. i.e. the last segment that didn't get sent in the for loop
// this length is fine because it's always sizeof(AFCPacket) + 8, but to be sure we do it again
if (current_count == length) { afc_unlock(client); return current_count; }
if (current_count == length) {
afc_unlock(client);
return current_count;
}
client->afc_packet->this_length = sizeof(AFCPacket) + 8;
client->afc_packet->entire_length = client->afc_packet->this_length + (length - current_count);
// operation is already AFC_WRITE, but set again to be sure
client->afc_packet->operation = AFC_WRITE;
out_buffer = (char*)malloc(sizeof(char) * client->afc_packet->entire_length - sizeof(AFCPacket));
memcpy(out_buffer, (char*)&file->filehandle, sizeof(uint32));
memcpy(out_buffer+4, (char*)&zero, sizeof(uint32));
memcpy(out_buffer+8, data+current_count, (length - current_count));
bytes = dispatch_AFC_packet(client, out_buffer, (length - current_count) + 8);
free(out_buffer); out_buffer = NULL;
free(out_buffer);
out_buffer = NULL;
current_count += bytes;
if (bytes <= 0) { afc_unlock(client); return current_count; }
if (bytes <= 0) {
afc_unlock(client);
return current_count;
}
zero = bytes;
bytes = receive_AFC_data(client, &acknowledgement);
afc_unlock(client);
if (bytes < 0) {
if (debug) printf("afc_write_file: uh oh?\n");
if (debug) fprintf(stderr, "afc_write_file: uh oh?\n");
}
return current_count;
}
/** Closes a file on the phone.
*
* @param client The client to close the file with.
* @param file A pointer to an AFCFile struct containing the file handle of the
* file to close.
*/
void afc_close_file(AFClient *client, AFCFile *file) {
char *buffer = malloc(sizeof(char) * 8);
uint32 zero = 0;
if (debug) printf("File handle %i\n", file->filehandle);
int bytes = 0;
afc_lock(client);
if (debug) fprintf(stderr, "afc_close_file: File handle %i\n", file->filehandle);
// Send command
memcpy(buffer, &file->filehandle, sizeof(uint32));
memcpy(buffer+sizeof(uint32), &zero, sizeof(zero));
client->afc_packet->operation = AFC_FILE_CLOSE;
int bytes = 0;
client->afc_packet->entire_length = client->afc_packet->this_length = 0;
bytes = dispatch_AFC_packet(client, buffer, sizeof(char) * 8);
free(buffer);
client->afc_packet->entire_length = client->afc_packet->this_length = 0;
if (bytes <= 0) { afc_unlock(client); return; }
buffer = NULL;
// FIXME: Is this necesary?
//client->afc_packet->entire_length = client->afc_packet->this_length = 0;
if (bytes <= 0) {
afc_unlock(client);
return;
}
// Receive the response
bytes = receive_AFC_data(client, &buffer);
if (buffer) free(buffer);
afc_unlock(client);
if (buffer) { free(buffer); }
return;
}
/** Seeks to a given position of a pre-opened file on the phone.
*
* @param client The client to use to seek to the position.
* @param file The file to seek to a position on.
* @param seekpos Where to seek to. If passed a negative value, this will seek
* from the end of the file.
*
* @return 0 on success, -1 on failure.
*/
int afc_seek_file(AFClient *client, AFCFile *file, int seekpos) {
afc_lock(client);
char *buffer = (char*)malloc(sizeof(char) * 24);
uint32 seekto = 0, bytes = 0, zero = 0;
if (seekpos < 0) seekpos = file->size - abs(seekpos);
seekto = seekpos;
afc_lock(client);
// Send the command
seekto = seekpos;
memcpy(buffer, &file->filehandle, sizeof(uint32)); // handle
memcpy(buffer+4, &zero, sizeof(uint32)); // pad
memcpy(buffer+8, &zero, sizeof(uint32)); // fromwhere
......@@ -578,22 +843,45 @@ int afc_seek_file(AFClient *client, AFCFile *file, int seekpos) {
client->afc_packet->operation = AFC_FILE_SEEK;
client->afc_packet->this_length = client->afc_packet->entire_length = 0;
bytes = dispatch_AFC_packet(client, buffer, 23);
free(buffer); buffer = NULL;
if (bytes <= 0) { afc_unlock(client); return -1; }
free(buffer);
buffer = NULL;
if (bytes <= 0) {
afc_unlock(client);
return -1;
}
// Receive response
bytes = receive_AFC_data(client, &buffer);
if (buffer) free(buffer);
afc_unlock(client);
if (bytes >= 0) return 0;
else return -1;
if (bytes >= 0) {
return 0;
} else {
return -1;
}
}
/** Sets the size of a file on the phone.
*
* @param client The client to use to set the file size.
* @param file The (pre-opened) file to set the size on.
* @param newsize The size to set the file to.
*
* @return 0 on success, -1 on failure.
*
* @note This function is more akin to ftruncate than truncate, and truncate
* calls would have to open the file before calling this, sadly.
*/
int afc_truncate_file(AFClient *client, AFCFile *file, uint32 newsize) {
afc_lock(client);
char *buffer = (char*)malloc(sizeof(char) * 16);
uint32 bytes = 0, zero = 0;
afc_lock(client);
// Send command
memcpy(buffer, &file->filehandle, sizeof(uint32)); // handle
memcpy(buffer+4, &zero, sizeof(uint32)); // pad
memcpy(buffer+8, &newsize, sizeof(uint32)); // newsize
......@@ -601,13 +889,23 @@ int afc_truncate_file(AFClient *client, AFCFile *file, uint32 newsize) {
client->afc_packet->operation = AFC_FILE_TRUNCATE;
client->afc_packet->this_length = client->afc_packet->entire_length = 0;
bytes = dispatch_AFC_packet(client, buffer, 15);
free(buffer); buffer = NULL;
if (bytes <= 0) { afc_unlock(client); return -1; }
free(buffer);
buffer = NULL;
if (bytes <= 0) {
afc_unlock(client);
return -1;
}
// Receive response
bytes = receive_AFC_data(client, &buffer);
if (buffer) free(buffer);
afc_unlock(client);
if (bytes >= 0) return 0;
else return -1;
if (bytes >= 0) {
return 0;
} else {
return -1;
}
}
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