Remove AFC to errno conversion and make afc_receive_data() return AFC errors

2 files changed, 81 insertions, 163 deletions

diff --git a/src/AFC.c b/src/AFC.c
index 95ce0a1..87ce78e 100644
--- a/src/AFC.c
+++ b/src/AFC.c
@@ -21,7 +21,6 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <errno.h>
 #include <unistd.h>
 
 #include "AFC.h"
@@ -112,91 +111,7 @@ afc_error_t afc_client_free(afc_client_t client)
                 g_mutex_free(client->mutex);
         }
         free(client);
-        return IPHONE_E_SUCCESS;
-}
-
-/**
- * Returns the AFC error code that has been sent by the device if 
- *  an error occured (set inside receive_AFC_data)
- *
- * @param client AFC client for that the error value is to be retrieved.
- *
- * @return AFC error code or -1 on error.
- */
-int afc_get_afcerror(afc_client_t client)
-{
-        int res = -1;
-        if (client) {
-                afc_lock(client);
-                res = client->afcerror;
-                afc_unlock(client);
-        }
-        return res;
-}
-
-/** 
- * Tries to convert the AFC error value into a meaningful errno value.
- * Internally used by afc_get_errno.
- *
- * @param afcerror AFC error value to convert
- *
- * @return errno value or -1 if the errno could not be determined.
- *
- * @see afc_get_errno
- */
-static int afcerror_to_errno(int afcerror)
-{
-        int res = -1;
-        switch (afcerror) {
-                case 0: // ERROR_SUCCESS, this means no error.
-                        res = 0;
-                        break;
-                case 4: // occurs if you try to open a file as directory
-                        res = ENOTDIR;
-                        break;
-                case 7: // occurs e.g. if you try to close a file handle that
-                        //  does not belong to an open file
-                        res = EINVAL;
-                        break;
-                case 8: // occurs if you try to open a non-existent file
-                        res = ENOENT;
-                        break;
-                case 9: // occurs if you try to open a directory as file
-                        res = EISDIR;
-                        break;
-                case 10: // occurs if you try to open a file without permission
-                        res = EPERM;
-                        break;
-                case 19: // occurs if you try to lock an already locked file
-                        res = EWOULDBLOCK;
-                        break;
-                default: // we'll assume it's an errno value, but report it
-                        log_debug_msg("WARNING: unknown AFC error %d, perhaps it's '%s'?\n", afcerror, strerror(afcerror));
-                        res = afcerror;
-                        break;
-        }
-
-        log_debug_msg("Mapped AFC error %d to errno %d: %s\n", afcerror, res, strerror(res));
-
-        return res;
-}
-
-/**
- * Returns the client's AFC error code converted to an errno value.
- *
- * @param client AFC client for that the errno value is to be retrieved.
- *
- * @return errno value or -1 on error.
- */
-int afc_get_errno(afc_client_t client)
-{
-        int res = -1;
-        if (client) {
-                afc_lock(client);
-                res = afcerror_to_errno(client->afcerror);
-                afc_unlock(client);
-        }
-        return res;
+        return AFC_E_SUCCESS;
 }
 
 /** Dispatches an AFC packet over a client.
@@ -294,28 +209,26 @@ static int afc_dispatch_packet(afc_client_t client, const char *data, uint64_t l
  *         received raised a non-trivial error condition (i.e. non-zero with
  *         AFC_ERROR operation)
  */
-static int receive_AFC_data(afc_client_t client, char **dump_here)
+static afc_error_t afc_receive_data(afc_client_t client, char **dump_here, int *bytes)
 {
         AFCPacket header;
-        int bytes = 0;
         uint32_t entire_len = 0;
         uint32_t this_len = 0;
         uint32_t current_count = 0;
         uint64_t param1 = -1;
 
-        // reset internal afc error value
-        client->afcerror = 0;
+        *bytes = 0;
 
-        // first, read the AFC header
-        usbmuxd_recv(client->sfd, (char*)&header, sizeof(AFCPacket), (uint32_t*)&bytes);
-        if (bytes <= 0) {
+        /* first, read the AFC header */
+        usbmuxd_recv(client->sfd, (char*)&header, sizeof(AFCPacket), (uint32_t*)bytes);
+        if (*bytes <= 0) {
                 log_debug_msg("%s: Just didn't get enough.\n", __func__);
                 *dump_here = NULL;
-                return -1;
-        } else if ((uint32_t)bytes < sizeof(AFCPacket)) {
+                return AFC_E_MUX_ERROR;
+        } else if ((uint32_t)*bytes < sizeof(AFCPacket)) {
                 log_debug_msg("%s: Did not even get the AFCPacket header\n", __func__);
                 *dump_here = NULL;
-                return -1;
+                return AFC_E_MUX_ERROR;
         }
 
         /* check if it's a valid AFC header */
@@ -328,23 +241,23 @@ static int receive_AFC_data(afc_client_t client, char **dump_here)
                 /* otherwise print a warning but do not abort */
                 log_debug_msg("%s: ERROR: Unexpected packet number (%lld != %lld) aborting.\n", __func__, header.packet_num, client->afc_packet->packet_num);
                 *dump_here = NULL;
-                return -1;
+                return AFC_E_OP_HEADER_INVALID;
         }
 
         /* then, read the attached packet */
         if (header.this_length < sizeof(AFCPacket)) {
                 log_debug_msg("%s: Invalid AFCPacket header received!\n", __func__);
                 *dump_here = NULL;
-                return -1;
+                return AFC_E_OP_HEADER_INVALID;
         } else if ((header.this_length == header.entire_length)
                         && header.entire_length == sizeof(AFCPacket)) {
                 log_debug_msg("%s: Empty AFCPacket received!\n", __func__);
                 *dump_here = NULL;
+                *bytes = 0;
                 if (header.operation == AFC_OP_DATA) {
-                        return 0;
+                        return AFC_E_SUCCESS;
                 } else {
-                        client->afcerror = EIO;
-                        return -1;
+                        return AFC_E_IO_ERROR;
                 }
         }
 
@@ -360,17 +273,17 @@ static int receive_AFC_data(afc_client_t client, char **dump_here)
 
         *dump_here = (char*)malloc(entire_len);
         if (this_len > 0) {
-                usbmuxd_recv(client->sfd, *dump_here, this_len, (uint32_t*)&bytes);
-                if (bytes <= 0) {
+                usbmuxd_recv(client->sfd, *dump_here, this_len, (uint32_t*)bytes);
+                if (*bytes <= 0) {
                         free(*dump_here);
                         *dump_here = NULL;
                         log_debug_msg("%s: Did not get packet contents!\n", __func__);
-                        return -1;
-                } else if ((uint32_t)bytes < this_len) {
+                        return AFC_E_NOT_ENOUGH_DATA;
+                } else if ((uint32_t)*bytes < this_len) {
                         free(*dump_here);
                         *dump_here = NULL;
                         log_debug_msg("%s: Could not receive this_len=%d bytes\n", __func__, this_len);
-                        return -1;
+                        return AFC_E_NOT_ENOUGH_DATA;
                 }
         }
 
@@ -378,12 +291,12 @@ static int receive_AFC_data(afc_client_t client, char **dump_here)
 
         if (entire_len > this_len) {
                 while (current_count < entire_len) {
-                        usbmuxd_recv(client->sfd, (*dump_here)+current_count, entire_len - current_count, (uint32_t*)&bytes);
-                        if (bytes <= 0) {
-                                log_debug_msg("%s: Error receiving data (recv returned %d)\n", __func__, bytes);
+                        usbmuxd_recv(client->sfd, (*dump_here)+current_count, entire_len - current_count, (uint32_t*)bytes);
+                        if (*bytes <= 0) {
+                                log_debug_msg("%s: Error receiving data (recv returned %d)\n", __func__, *bytes);
                                 break;
                         }
-                        current_count += bytes;
+                        current_count += *bytes;
                 }
                 if (current_count < entire_len) {
                         log_debug_msg("%s: WARNING: could not receive full packet (read %s, size %d)\n", __func__, current_count, entire_len);
@@ -394,39 +307,42 @@ static int receive_AFC_data(afc_client_t client, char **dump_here)
                 param1 = *(uint64_t*)(*dump_here);
         }
 
-        // check for errors
-        if (header.operation == AFC_OP_DATA) {
-                // we got a positive response!
-                log_debug_msg("%s: got a success response\n", __func__);
-        } else if (header.operation == AFC_OP_FILE_OPEN_RES) {
-                // we got a file handle response
-                log_debug_msg("%s: got a file handle response, handle=%lld\n", __func__, param1);
-        } else if (header.operation == AFC_OP_STATUS) {
-                // error message received
-                if (param1 == 0) {
-                        // ERROR_SUCCESS, this is not an error!
-                        log_debug_msg("%s: ERROR_SUCCESS\n", __func__);
-                } else {
-                        // but this is an error!
-                        log_debug_msg("%s: ERROR %lld\n", __func__, param1);
+        log_debug_msg("%s: packet data size = %i\n", __func__, current_count);
+        log_debug_msg("%s: packet data follows\n", __func__);
+        log_debug_buffer(*dump_here, current_count);
+
+        /* check operation types */
+        if (header.operation == AFC_OP_STATUS) {
+                /* status response */
+                log_debug_msg("%s: got a status response, code=%lld\n", __func__, param1);
+
+                if (param1 != AFC_E_SUCCESS) {
+                        /* error status */
+                        /* free buffer */
                         free(*dump_here);
                         *dump_here = NULL;
-                        // store error value
-                        client->afcerror = (int)param1;
-                        afcerror_to_errno(client->afcerror);
-                        return -1;
+                        return (afc_error_t)param1;
                 }
+        } else if (header.operation == AFC_OP_DATA) {
+                /* data response */
+                log_debug_msg("%s: got a data response\n", __func__);
+        } else if (header.operation == AFC_OP_FILE_OPEN_RES) {
+                /* file handle response */
+                log_debug_msg("%s: got a file handle response, handle=%lld\n", __func__, param1);
         } else {
                 /* unknown operation code received */
                 free(*dump_here);
                 *dump_here = NULL;
+                *bytes = 0;
 
                 log_debug_msg("%s: WARNING: Unknown operation code received 0x%llx param1=%lld\n", __func__, header.operation, param1);
                 fprintf(stderr, "%s: WARNING: Unknown operation code received 0x%llx param1=%lld\n", __func__, header.operation, param1);
 
-                return -1;
+                return AFC_E_OP_NOT_SUPPORTED;
         }
-        return current_count;
+
+        *bytes = current_count;
+        return AFC_E_SUCCESS;
 }
 
 static int count_nullspaces(char *string, int number)
@@ -489,15 +405,13 @@ afc_error_t afc_read_directory(afc_client_t client, const char *dir, char ***lis
                 return AFC_E_NOT_ENOUGH_DATA;
         }
         // Receive the data
-        bytes = receive_AFC_data(client, &data);
-        if (bytes < 0) {
+        ret = afc_receive_data(client, &data, &bytes);
+        if (ret != AFC_E_SUCCESS) {
                 afc_unlock(client);
-                return IPHONE_E_AFC_ERROR;
+                return ret;
         }
         // Parse the data
         list_loc = make_strings_list(data, bytes);
-        if (list_loc)
-                ret = IPHONE_E_SUCCESS;
         if (data)
                 free(data);
 
@@ -534,10 +448,10 @@ afc_error_t afc_get_device_info(afc_client_t client, char ***infos)
                 return AFC_E_NOT_ENOUGH_DATA;
         }
         // Receive the data
-        bytes = receive_AFC_data(client, &data);
-        if (bytes < 0) {
+        ret = afc_receive_data(client, &data, &bytes);
+        if (ret != AFC_E_SUCCESS) {
                 afc_unlock(client);
-                return IPHONE_E_AFC_ERROR;
+                return ret;
         }
         // Parse the data
         list = make_strings_list(data, bytes);
@@ -579,7 +493,7 @@ afc_error_t afc_remove_path(afc_client_t client, const char *path)
                 return AFC_E_NOT_ENOUGH_DATA;
         }
         // Receive response
-        bytes = receive_AFC_data(client, &response);
+        ret = afc_receive_data(client, &response, &bytes);
         if (response)
                 free(response);
 
@@ -621,7 +535,7 @@ afc_error_t afc_rename_path(afc_client_t client, const char *from, const char *t
                 return AFC_E_NOT_ENOUGH_DATA;
         }
         // Receive response
-        bytes = receive_AFC_data(client, &response);
+        ret = afc_receive_data(client, &response, &bytes);
         if (response)
                 free(response);
 
@@ -659,7 +573,7 @@ afc_error_t afc_make_directory(afc_client_t client, const char *dir)
                 return AFC_E_NOT_ENOUGH_DATA;
         }
         // Receive response
-        bytes = receive_AFC_data(client, &response);
+        ret = afc_receive_data(client, &response, &bytes);
         if (response)
                 free(response);
 
@@ -696,14 +610,12 @@ afc_error_t afc_get_file_info(afc_client_t client, const char *path, char ***inf
         afc_dispatch_packet(client, path, strlen(path)+1);
 
         // Receive data
-        length = receive_AFC_data(client, &received);
+        ret = afc_receive_data(client, &received, &bytes);
         if (received) {
                 *infolist = make_strings_list(received, bytes);
                 free(received);
         }
 
-        log_debug_msg("%s: Didn't get any further data\n", __func__);
-
         afc_unlock(client);
 
         return ret;
@@ -754,8 +666,8 @@ afc_file_open(afc_client_t client, const char *filename,
                 return AFC_E_NOT_ENOUGH_DATA;
         }
         // Receive the data
-        length = receive_AFC_data(client, &data);
-        if (length > 0 && data) {
+        ret = afc_receive_data(client, &data, &bytes);
+        if ((ret == AFC_E_SUCCESS) && (bytes > 0) && data) {
                 afc_unlock(client);
 
                 // Get the file handle
@@ -764,6 +676,8 @@ afc_file_open(afc_client_t client, const char *filename,
                 return ret;
         }
 
+        log_debug_msg("%s: Didn't get any further data\n", __func__);
+
         afc_unlock(client);
 
         return ret;
@@ -811,9 +725,10 @@ afc_file_read(afc_client_t client, uint64_t handle, char *data, int length, uint
                         return AFC_E_NOT_ENOUGH_DATA;
                 }
                 // Receive the data
-                bytes_loc = receive_AFC_data(client, &input);
-               log_debug_msg("%s: bytes returned: %i\n", __func__, bytes_loc);
-                if (bytes_loc < 0) {
+                ret = afc_receive_data(client, &input, &bytes_loc);
+                log_debug_msg("%s: afc_receive_data returned error: %d\n", __func__, ret);
+                log_debug_msg("%s: bytes returned: %i\n", __func__, bytes_loc);
+                if (ret != AFC_E_SUCCESS) {
                         afc_unlock(client);
                         return ret;
                 } else if (bytes_loc == 0) {
@@ -887,8 +802,8 @@ afc_file_write(afc_client_t client, uint64_t handle,
                 out_buffer = NULL;
 
                 current_count += bytes_loc;
-                bytes_loc = receive_AFC_data(client, &acknowledgement);
-                if (bytes_loc < 0) {
+                ret = afc_receive_data(client, &acknowledgement, &bytes_loc);
+                if (ret != AFC_E_SUCCESS) {
                         afc_unlock(client);
                         return ret;
                 } else {
@@ -925,9 +840,9 @@ afc_file_write(afc_client_t client, uint64_t handle,
         }
 
         zero = bytes_loc;
-        bytes_loc = receive_AFC_data(client, &acknowledgement);
+        ret = afc_receive_data(client, &acknowledgement, &bytes_loc);
         afc_unlock(client);
-        if (bytes_loc < 0) {
+        if (ret != AFC_E_SUCCESS) {
                 log_debug_msg("%s: uh oh?\n", __func__);
         } else {
                 free(acknowledgement);
@@ -968,7 +883,7 @@ afc_error_t afc_file_close(afc_client_t client, uint64_t handle)
         }
 
         // Receive the response
-        bytes = receive_AFC_data(client, &buffer);
+        ret = afc_receive_data(client, &buffer, &bytes);
         if (buffer)
                 free(buffer);
 
@@ -1018,7 +933,7 @@ afc_error_t afc_file_lock(afc_client_t client, uint64_t handle, afc_lock_op_t op
                 return AFC_E_UNKNOWN_ERROR;
         }
         // Receive the response
-        bytes = receive_AFC_data(client, &buffer);
+        ret = afc_receive_data(client, &buffer, &bytes);
         if (buffer) {
                 log_debug_buffer(buffer, bytes);
                 free(buffer);
@@ -1065,7 +980,7 @@ afc_error_t afc_file_seek(afc_client_t client, uint64_t handle, int64_t offset,
                 return AFC_E_NOT_ENOUGH_DATA;
         }
         // Receive response
-        bytes = receive_AFC_data(client, &buffer);
+        ret = afc_receive_data(client, &buffer, &bytes);
         if (buffer)
                 free(buffer);
 
@@ -1074,7 +989,12 @@ afc_error_t afc_file_seek(afc_client_t client, uint64_t handle, int64_t offset,
         if (bytes < 0) {
                 return IPHONE_E_AFC_ERROR;
         }
-        return IPHONE_E_SUCCESS;
+        if (buffer)
+                free(buffer);
+
+        afc_unlock(client);
+
+        return ret;
 }
 
 /** Sets the size of a file on the phone.
@@ -1113,7 +1033,7 @@ afc_error_t afc_file_truncate(afc_client_t client, uint64_t handle, uint64_t new
                 return AFC_E_NOT_ENOUGH_DATA;
         }
         // Receive response
-        bytes = receive_AFC_data(client, &buffer);
+        ret = afc_receive_data(client, &buffer, &bytes);
         if (buffer)
                 free(buffer);
 
@@ -1156,7 +1076,7 @@ afc_error_t afc_truncate(afc_client_t client, const char *path, off_t newsize)
                 return AFC_E_NOT_ENOUGH_DATA;
         }
         // Receive response
-        bytes = receive_AFC_data(client, &response);
+        ret = afc_receive_data(client, &response, &bytes);
         if (response)
                 free(response);
 
@@ -1205,7 +1125,7 @@ afc_error_t afc_make_link(afc_client_t client, afc_link_type_t linktype, const c
                 return AFC_E_NOT_ENOUGH_DATA;
         }
         // Receive response
-        bytes = receive_AFC_data(client, &response);
+        ret = afc_receive_data(client, &response, &bytes);
         if (response)
                 free(response);
 
diff --git a/src/AFC.h b/src/AFC.h
index 909e8c3..7ed6bd8 100644
--- a/src/AFC.h
+++ b/src/AFC.h
@@ -50,7 +50,6 @@ struct afc_client_int {
         AFCPacket *afc_packet;
         int file_handle;
         int lock;
-        int afcerror;
         GMutex *mutex;
 };
 
@@ -86,4 +85,3 @@ enum {
         AFC_OP_MAKE_LINK       = 0x0000001C     // MakeLink
 };
 
-static int afcerror_to_errno(int afcerror);