qmi-codegen: use the new TLV reader API

7 files changed, 134 insertions, 409 deletions

diff --git a/build-aux/qmi-codegen/Field.py b/build-aux/qmi-codegen/Field.py
index c4b395a..7d51b93 100644
--- a/build-aux/qmi-codegen/Field.py
+++ b/build-aux/qmi-codegen/Field.py
@@ -41,7 +41,7 @@ class Field:
         # The specific TLV ID
         self.id = dictionary['id']
         # Whether the field is to be considered mandatory in the message
-        self.mandatory = dictionary['mandatory']
+        self.mandatory = True if dictionary['mandatory'] == 'yes' else False
         # The type, which must always be "TLV"
         self.type = dictionary['type']
         # The container type, which must be either "Input" or "Output"
@@ -267,49 +267,53 @@ class Field:
     Emit the code responsible for retrieving the TLV from the QMI message
     """
     def emit_output_tlv_get(self, f, line_prefix):
+        tlv_out = utils.build_underscore_name (self.fullname) + '_out'
+        error = 'error' if self.mandatory else 'NULL'
         translations = { 'name'                 : self.name,
                          'container_underscore' : utils.build_underscore_name (self.prefix),
-                         'underscore'           : utils.build_underscore_name (self.fullname),
+                         'tlv_out'              : tlv_out,
                          'tlv_id'               : self.id_enum_name,
                          'variable_name'        : self.variable_name,
                          'lp'                   : line_prefix,
-                         'error'                : 'error' if self.mandatory == 'yes' else 'NULL'}
+                         'error'                : error }
 
         template = (
-            '${lp}const guint8 *buffer;\n'
-            '${lp}guint16 buffer_len;\n'
+            '${lp}gsize offset = 0;\n'
+            '${lp}gsize init_offset;\n'
+            '${lp}gboolean tlv_error = FALSE;\n'
             '\n'
-            '${lp}buffer = qmi_message_get_raw_tlv (message,\n'
-            '${lp}                                  ${tlv_id},\n'
-            '${lp}                                  &buffer_len);\n'
-            '${lp}if (buffer && ${underscore}_validate (buffer, buffer_len)) {\n'
-            '${lp}    self->${variable_name}_set = TRUE;\n'
-            '\n')
+            '${lp}init_offset = qmi_message_tlv_read_init (message, ${tlv_id}, NULL, ${error});\n')
+        if self.mandatory:
+            template += (
+                '\n'
+                '${lp}if (init_offset == 0) {\n'
+                '${lp}    g_prefix_error (${error}, "Couldn\'t get the mandatory ${name} TLV: ");\n'
+                '${lp}    ${container_underscore}_unref (self);\n'
+                '${lp}    return NULL;\n'
+                '${lp}}\n')
+
+
         f.write(string.Template(template).substitute(translations))
 
         # Now, read the contents of the buffer into the variable
-        self.variable.emit_buffer_read(f, line_prefix + '    ', 'self->' + self.variable_name, 'buffer', 'buffer_len')
+        self.variable.emit_buffer_read(f, line_prefix + '    ', tlv_out, error, 'self->' + self.variable_name)
 
         template = (
             '\n'
-            '${lp}    /* The remaining size of the buffer needs to be 0 if we successfully read the TLV */\n'
-            '${lp}    if (buffer_len > 0) {\n'
-            '${lp}        g_warning ("Left \'%u\' bytes unread when getting the \'${name}\' TLV", buffer_len);\n'
-            '${lp}    }\n')
-
-        if self.mandatory == 'yes':
+            '${lp}/* The remaining size of the buffer needs to be 0 if we successfully read the TLV */\n'
+            '${lp}if ((offset = __qmi_message_tlv_read_remaining_size (message, init_offset, offset)) > 0) {\n'
+            '${lp}    g_warning ("Left \'%" G_GSIZE_FORMAT "\' bytes unread when getting the \'${name}\' TLV", offset);\n'
+            '${lp}}\n'
+            '\n'
+            '${tlv_out}:\n'
+            '${lp}if (!tlv_error)\n'
+            '${lp}    self->${variable_name}_set = TRUE;\n')
+        if self.mandatory:
             template += (
-                '${lp}} else {\n'
-                '${lp}    g_set_error (error,\n'
-                '${lp}                 QMI_CORE_ERROR,\n'
-                '${lp}                 QMI_CORE_ERROR_TLV_NOT_FOUND,\n'
-                '${lp}                 \"Couldn\'t get the ${name} TLV: Not found\");\n'
+                '${lp}else {\n'
                 '${lp}    ${container_underscore}_unref (self);\n'
                 '${lp}    return NULL;\n'
                 '${lp}}\n')
-        else:
-            template += (
-                '${lp}}\n')
         f.write(string.Template(template).substitute(translations))
 
 
@@ -328,73 +332,34 @@ class Field:
 
         template = (
             '\n'
-            'static gboolean\n'
-            '${underscore}_validate (\n'
-            '    const guint8 *buffer,\n'
-            '    guint16 buffer_len)\n'
-            '{\n'
-            '    guint32 expected_len = 0;\n'
-            '\n')
-        f.write(string.Template(template).substitute(translations))
-
-        # Now, read the size of the expected TLV.
-        #
-        # Note: the emit_size_read() implementation is allowed to return FALSE
-        # to indicate an error at any time.
-        self.variable.emit_size_read(f, '    ', 'expected_len', 'buffer', 'buffer_len')
-
-        template = (
-            '\n'
-            '    if (buffer_len < expected_len) {\n'
-            '        g_warning ("Cannot read the \'${name}\' TLV: expected \'%u\' bytes, but only got \'%u\' bytes",\n'
-            '                   expected_len, buffer_len);\n'
-            '        return FALSE;\n'
-            '    }\n'
-            '\n'
-            '    if (buffer_len > expected_len) {\n'
-            '        g_debug ("Reading the \'${name}\' TLV: expected \'%u\' bytes, but got \'%u\' bytes",\n'
-            '                 expected_len, buffer_len);\n'
-            '        return TRUE;\n'
-            '    }\n'
-            '\n'
-            '    return TRUE;\n'
-            '}\n'
-            '\n')
-        f.write(string.Template(template).substitute(translations))
-
-        template = (
-            '\n'
             'static gchar *\n'
             '${underscore}_get_printable (\n'
             '    QmiMessage *message,\n'
             '    const gchar *line_prefix)\n'
             '{\n'
-            '    const guint8 *buffer;\n'
-            '    guint16 buffer_len;\n'
+            '    gsize offset = 0;\n'
+            '    gsize init_offset;\n'
+            '    GString *printable;\n'
+            '    GError *error = NULL;\n'
             '\n'
-            '    buffer = qmi_message_get_raw_tlv (message,\n'
-            '                                      ${tlv_id},\n'
-            '                                      &buffer_len);\n'
-            '    if (buffer && ${underscore}_validate (buffer, buffer_len)) {\n'
-            '        GString *printable;\n'
+            '    if ((init_offset = qmi_message_tlv_read_init (message, ${tlv_id}, NULL, NULL)) == 0)\n'
+            '        return NULL;\n'
             '\n'
-            '        printable = g_string_new ("");\n')
+            '    printable = g_string_new ("");\n')
         f.write(string.Template(template).substitute(translations))
 
         # Now, read the contents of the buffer into the printable representation
-        self.variable.emit_get_printable(f, '        ', 'printable', 'buffer', 'buffer_len')
+        self.variable.emit_get_printable(f, '    ')
 
         template = (
             '\n'
-            '        /* The remaining size of the buffer needs to be 0 if we successfully read the TLV */\n'
-            '        if (buffer_len > 0) {\n'
-            '            g_warning ("Left \'%u\' bytes unread when getting the \'${name}\' TLV as printable", buffer_len);\n'
-            '        }\n'
-            '\n'
-            '        return g_string_free (printable, FALSE);\n'
-            '    }\n'
+            '    if ((offset = __qmi_message_tlv_read_remaining_size (message, init_offset, offset)) > 0)\n'
+            '        g_string_append_printf (printable, "Additional unexpected \'%" G_GSIZE_FORMAT "\' bytes", offset);\n'
             '\n'
-            '    return NULL;\n'
+            'out:\n'
+            '    if (error)\n'
+            '        g_string_append_printf (printable, " ERROR: %s", error->message);\n'
+            '    return g_string_free (printable, FALSE);\n'
             '}\n')
         f.write(string.Template(template).substitute(translations))
 
diff --git a/build-aux/qmi-codegen/Variable.py b/build-aux/qmi-codegen/Variable.py
index a364399..cc992c6 100644
--- a/build-aux/qmi-codegen/Variable.py
+++ b/build-aux/qmi-codegen/Variable.py
@@ -73,7 +73,7 @@ class Variable:
     Emits the code involved in reading the variable from the raw byte stream
     into the specific private format.
     """
-    def emit_buffer_read(self, f, line_prefix, variable_name, buffer_name, buffer_len):
+    def emit_buffer_read(self, f, line_prefix, tlv_out, error, variable_name):
         pass
 
 
@@ -86,16 +86,9 @@ class Variable:
 
 
     """
-    Emits the code involved in computing the size of the variable.
-    """
-    def emit_size_read(self, f, line_prefix, variable_name, buffer_name, buffer_len):
-        pass
-
-
-    """
     Emits the code to get the contents of the given variable as a printable string.
     """
-    def emit_get_printable(self, f, line_prefix, printable, buffer_name, buffer_len):
+    def emit_get_printable(self, f, line_prefix):
         pass
 
     """
diff --git a/build-aux/qmi-codegen/VariableArray.py b/build-aux/qmi-codegen/VariableArray.py
index 68284c8..b1c8110 100644
--- a/build-aux/qmi-codegen/VariableArray.py
+++ b/build-aux/qmi-codegen/VariableArray.py
@@ -132,16 +132,14 @@ class VariableArray(Variable):
     Reading an array from the raw byte buffer is just about providing a loop to
     read every array element one by one.
     """
-    def emit_buffer_read(self, f, line_prefix, variable_name, buffer_name, buffer_len):
+    def emit_buffer_read(self, f, line_prefix, tlv_out, error, variable_name):
         common_var_prefix = utils.build_underscore_name(self.name)
-        translations = { 'lp'             : line_prefix,
-                         'private_format' : self.private_format,
+        translations = { 'lp'                          : line_prefix,
+                         'variable_name'               : variable_name,
+                         'private_format'              : self.private_format,
                          'public_array_element_format' : self.array_element.public_format,
-                         'underscore'     : self.clear_func_name(),
-                         'variable_name'  : variable_name,
-                         'buffer_name'    : buffer_name,
-                         'buffer_len'     : buffer_len,
-                         'common_var_prefix' : common_var_prefix }
+                         'underscore'                  : self.clear_func_name(),
+                         'common_var_prefix'           : common_var_prefix }
 
         template = (
             '${lp}{\n'
@@ -169,21 +167,20 @@ class VariableArray(Variable):
                 '\n'
                 '${lp}    /* Read number of items in the array */\n')
             f.write(string.Template(template).substitute(translations))
-            self.array_size_element.emit_buffer_read(f, line_prefix + '    ', common_var_prefix + '_n_items', buffer_name, buffer_len)
+            self.array_size_element.emit_buffer_read(f, line_prefix + '    ', tlv_out, error, common_var_prefix + '_n_items')
 
             if self.array_sequence_element != '':
                 template = (
                     '\n'
                     '${lp}    /* Read sequence in the array */\n')
                 f.write(string.Template(template).substitute(translations))
-                self.array_size_element.emit_buffer_read(f, line_prefix + '    ', common_var_prefix + '_sequence', buffer_name, buffer_len)
+                self.array_size_element.emit_buffer_read(f, line_prefix + '    ', tlv_out, error, common_var_prefix + '_sequence')
 
                 template = (
                     '\n'
                     '${lp}    ${variable_name}_sequence = ${common_var_prefix}_sequence;\n')
                 f.write(string.Template(template).substitute(translations))
 
-
         template = (
             '\n'
             '${lp}    ${variable_name} = g_array_sized_new (\n'
@@ -205,7 +202,7 @@ class VariableArray(Variable):
             '\n')
         f.write(string.Template(template).substitute(translations))
 
-        self.array_element.emit_buffer_read(f, line_prefix + '        ', common_var_prefix + '_aux', buffer_name, buffer_len)
+        self.array_element.emit_buffer_read(f, line_prefix + '        ', tlv_out, error, common_var_prefix + '_aux')
 
         template = (
             '${lp}        g_array_insert_val (${variable_name}, ${common_var_prefix}_i, ${common_var_prefix}_aux);\n'
@@ -215,84 +212,6 @@ class VariableArray(Variable):
 
 
     """
-    Emits the code involved in computing the size of the variable.
-    """
-    def emit_size_read(self, f, line_prefix, variable_name, buffer_name, buffer_len):
-        common_var_prefix = utils.build_underscore_name(self.name)
-        translations = { 'lp'             : line_prefix,
-                         'variable_name'  : variable_name,
-                         'buffer_name'    : buffer_name,
-                         'buffer_len'     : buffer_len,
-                         'common_var_prefix' : common_var_prefix }
-
-        template = (
-            '${lp}{\n'
-            '${lp}    guint ${common_var_prefix}_i;\n'
-            '\n')
-        f.write(string.Template(template).substitute(translations))
-
-        if self.fixed_size:
-            translations['fixed_size'] = self.fixed_size
-
-            template = (
-                '${lp}    guint16 ${common_var_prefix}_n_items = ${fixed_size};\n')
-            f.write(string.Template(template).substitute(translations))
-        else:
-            translations['array_size_element_format'] = self.array_size_element.public_format
-            if self.array_size_element.public_format == 'guint8':
-                translations['array_size_element_size'] = '1'
-            elif self.array_size_element.public_format == 'guint16':
-                translations['array_size_element_size'] = '2'
-            elif self.array_size_element.public_format == 'guint32':
-                translations['array_size_element_size'] = '4'
-            else:
-                raise ValueError('Invalid array size element format in %s array' % (self.name))
-
-            template = (
-                '${lp}    ${array_size_element_format} ${common_var_prefix}_n_items;\n'
-                '${lp}    const guint8 *${common_var_prefix}_aux_buffer = &${buffer_name}[${variable_name}];\n'
-                '${lp}    guint16 ${common_var_prefix}_aux_buffer_len;\n'
-                '\n'
-                '${lp}    ${common_var_prefix}_aux_buffer_len = ((${buffer_len} >= ${variable_name}) ? ${buffer_len} - ${variable_name} : 0);\n'
-                '${lp}    if (${common_var_prefix}_aux_buffer_len < ${array_size_element_size}) {\n'
-                '${lp}        g_warning ("Cannot read the array size: expected \'%u\' bytes, but only got \'%u\' bytes",\n'
-                '${lp}                   ${array_size_element_size}, ${common_var_prefix}_aux_buffer_len);\n'
-                '${lp}        return FALSE;\n'
-                '${lp}    }\n'
-                '\n'
-                '${lp}    ${variable_name} += ${array_size_element_size};\n')
-
-            if self.array_sequence_element != '':
-                if self.array_sequence_element.public_format == 'guint8':
-                    translations['array_sequence_element_size'] = '1'
-                elif self.array_sequence_element.public_format == 'guint16':
-                    translations['array_sequence_element_size'] = '2'
-                elif self.array_sequence_element.public_format == 'guint32':
-                    translations['array_sequence_element_size'] = '4'
-                else:
-                    translations['array_sequence_element_size'] = '0'
-                template += (
-                    '\n'
-                    '${lp}    ${variable_name} += ${array_sequence_element_size};\n')
-
-            f.write(string.Template(template).substitute(translations))
-
-            self.array_size_element.emit_buffer_read(f, line_prefix + '    ', common_var_prefix + '_n_items', common_var_prefix + '_aux_buffer', common_var_prefix + '_aux_buffer_len')
-
-        template = (
-            '\n'
-            '${lp}    for (${common_var_prefix}_i = 0; ${common_var_prefix}_i < ${common_var_prefix}_n_items; ${common_var_prefix}_i++) {\n'
-            '\n')
-        f.write(string.Template(template).substitute(translations))
-
-        self.array_element.emit_size_read(f, line_prefix + '        ', variable_name, buffer_name, buffer_len)
-
-        template = (
-            '${lp}    }\n'
-            '${lp}}\n')
-        f.write(string.Template(template).substitute(translations))
-
-    """
     Writing an array to the raw byte buffer is just about providing a loop to
     write every array element one by one.
     """
@@ -340,12 +259,9 @@ class VariableArray(Variable):
     The array will be printed as a list of fields enclosed between curly
     brackets
     """
-    def emit_get_printable(self, f, line_prefix, printable, buffer_name, buffer_len):
+    def emit_get_printable(self, f, line_prefix):
         common_var_prefix = utils.build_underscore_name(self.name)
-        translations = { 'lp'          : line_prefix,
-                         'printable'   : printable,
-                         'buffer_name' : buffer_name,
-                         'buffer_len'  : buffer_len,
+        translations = { 'lp'                : line_prefix,
                          'common_var_prefix' : common_var_prefix }
 
         template = (
@@ -374,34 +290,34 @@ class VariableArray(Variable):
                 '\n'
                 '${lp}    /* Read number of items in the array */\n')
             f.write(string.Template(template).substitute(translations))
-            self.array_size_element.emit_buffer_read(f, line_prefix + '    ', common_var_prefix + '_n_items', buffer_name, buffer_len)
+            self.array_size_element.emit_buffer_read(f, line_prefix + '    ', 'out', '&error', common_var_prefix + '_n_items')
 
             if self.array_sequence_element != '':
                 template = (
                     '\n'
                     '${lp}    /* Read sequence */\n')
                 f.write(string.Template(template).substitute(translations))
-                self.array_sequence_element.emit_buffer_read(f, line_prefix + '    ', common_var_prefix + '_sequence', buffer_name, buffer_len)
+                self.array_sequence_element.emit_buffer_read(f, line_prefix + '    ', 'out', '&error', common_var_prefix + '_sequence')
                 template = (
                     '\n'
-                    '${lp}    g_string_append_printf (${printable}, "[[Seq:%u]] ", ${common_var_prefix}_sequence);\n')
+                    '${lp}    g_string_append_printf (printable, "[[Seq:%u]] ", ${common_var_prefix}_sequence);\n')
                 f.write(string.Template(template).substitute(translations))
 
         template = (
             '\n'
-            '${lp}    g_string_append (${printable}, "{");\n'
+            '${lp}    g_string_append (printable, "{");\n'
             '\n'
             '${lp}    for (${common_var_prefix}_i = 0; ${common_var_prefix}_i < ${common_var_prefix}_n_items; ${common_var_prefix}_i++) {\n'
-            '${lp}        g_string_append_printf (${printable}, " [%u] = \'", ${common_var_prefix}_i);\n')
+            '${lp}        g_string_append_printf (printable, " [%u] = \'", ${common_var_prefix}_i);\n')
         f.write(string.Template(template).substitute(translations))
 
-        self.array_element.emit_get_printable(f, line_prefix + '        ', printable, buffer_name, buffer_len);
+        self.array_element.emit_get_printable(f, line_prefix + '        ');
 
         template = (
-            '${lp}        g_string_append (${printable}, " \'");\n'
+            '${lp}        g_string_append (printable, " \'");\n'
             '${lp}    }\n'
             '\n'
-            '${lp}    g_string_append (${printable}, "}");\n'
+            '${lp}    g_string_append (printable, "}");\n'
             '${lp}}')
         f.write(string.Template(template).substitute(translations))
 
diff --git a/build-aux/qmi-codegen/VariableInteger.py b/build-aux/qmi-codegen/VariableInteger.py
index 02d5b80..44a0761 100644
--- a/build-aux/qmi-codegen/VariableInteger.py
+++ b/build-aux/qmi-codegen/VariableInteger.py
@@ -56,81 +56,41 @@ class VariableInteger(Variable):
     """
     Read a single integer from the raw byte buffer
     """
-    def emit_buffer_read(self, f, line_prefix, variable_name, buffer_name, buffer_len):
+    def emit_buffer_read(self, f, line_prefix, tlv_out, error, variable_name):
         translations = { 'lp'             : line_prefix,
+                         'tlv_out'        : tlv_out,
+                         'variable_name'  : variable_name,
+                         'error'          : error,
                          'public_format'  : self.public_format,
                          'private_format' : self.private_format,
-                         'len'            : self.guint_sized_size,
-                         'variable_name'  : variable_name,
-                         'buffer_name'    : buffer_name,
-                         'buffer_len'     : buffer_len,
-                         'endian'         : self.endian }
+                         'len'            : self.guint_sized_size }
+
+        if self.private_format != 'guint8' and self.private_format != 'gint8' and self.private_format != 'gfloat':
+            translations['endian'] = ' ' + self.endian + ','
+        else:
+            translations['endian'] = ''
 
         if self.format == 'guint-sized':
             template = (
-                '${lp}/* Read the ${len}-byte long variable from the buffer */\n'
-                '${lp}qmi_utils_read_sized_guint_from_buffer (\n'
-                '${lp}    &${buffer_name},\n'
-                '${lp}    &${buffer_len},\n'
-                '${lp}    ${len},\n'
-                '${lp}    ${endian},\n'
-                '${lp}    &(${variable_name}));\n')
+                '${lp}if (!qmi_message_tlv_read_sized_guint (message, init_offset, &offset, ${len},${endian} &(${variable_name}), ${error}))\n'
+                '${lp}    goto ${tlv_out};\n')
         elif self.private_format == self.public_format:
             template = (
-                '${lp}/* Read the ${private_format} variable from the buffer */\n'
-                '${lp}qmi_utils_read_${private_format}_from_buffer (\n'
-                '${lp}    &${buffer_name},\n'
-                '${lp}    &${buffer_len},\n')
-            if self.private_format != 'guint8' and self.private_format != 'gint8' and self.private_format != 'gfloat':
-                template += (
-                    '${lp}    ${endian},\n')
-            template += (
-                '${lp}    &(${variable_name}));\n')
+                '${lp}if (!qmi_message_tlv_read_${private_format} (message, init_offset, &offset,${endian} &(${variable_name}), ${error}))\n'
+                '${lp}    goto ${tlv_out};\n')
         else:
             template = (
                 '${lp}{\n'
                 '${lp}    ${private_format} tmp;\n'
                 '\n'
-                '${lp}    /* Read the ${private_format} variable from the buffer */\n'
-                '${lp}    qmi_utils_read_${private_format}_from_buffer (\n'
-                '${lp}        &${buffer_name},\n'
-                '${lp}        &${buffer_len},\n')
-            if self.private_format != 'guint8' and self.private_format != 'gint8':
-                template += (
-                    '${lp}        ${endian},\n')
-            template += (
-                '${lp}        &tmp);\n'
+                '${lp}    if (!qmi_message_tlv_read_${private_format} (message, init_offset, &offset,${endian} &tmp, ${error}))\n'
+                '${lp}        goto ${tlv_out};\n'
                 '${lp}    ${variable_name} = (${public_format})tmp;\n'
                 '${lp}}\n')
         f.write(string.Template(template).substitute(translations))
 
 
     """
-    Emits the code involved in computing the size of the variable.
-    """
-    def emit_size_read(self, f, line_prefix, variable_name, buffer_name, buffer_len):
-        translations = { 'lp'            : line_prefix,
-                         'len'           : self.guint_sized_size,
-                         'variable_name' : variable_name }
-        template = ''
-        if self.format == 'guint-sized':
-            template += (
-                '${lp}${variable_name} += ${len};\n')
-        elif self.private_format == 'guint8' or self.private_format == 'gint8':
-            template += (
-                '${lp}${variable_name} += 1;\n')
-        elif self.private_format == 'guint16' or self.private_format == 'gint16':
-            template += (
-                '${lp}${variable_name} += 2;\n')
-        elif self.private_format == 'guint32' or self.private_format == 'gint32' or self.private_format == 'gfloat':
-            template += (
-                '${lp}${variable_name} += 4;\n')
-        elif self.private_format == 'guint64' or self.private_format == 'gint64':
-            template += (
-                '${lp}${variable_name} += 8;\n')
-        f.write(string.Template(template).substitute(translations))
-
-    """
     Return the data type size of fixed c-types
     """
     @staticmethod
@@ -229,12 +189,14 @@ class VariableInteger(Variable):
                          'private_format' : self.private_format,
                          'public_format'  : self.public_format,
                          'len'            : self.guint_sized_size,
-                         'printable'      : printable,
-                         'buffer_name'    : buffer_name,
-                         'buffer_len'     : buffer_len,
                          'common_format'  : common_format,
-                         'common_cast'    : common_cast,
-                         'endian'         : self.endian }
+                         'common_cast'    : common_cast }
+
+        if self.private_format != 'guint8' and self.private_format != 'gint8' and self.private_format != 'gfloat':
+            translations['endian'] = ' ' + self.endian + ','
+        else:
+            translations['endian'] = ''
+
         template = (
             '\n'
             '${lp}{\n'
@@ -243,42 +205,28 @@ class VariableInteger(Variable):
 
         if self.format == 'guint-sized':
             template += (
-                '${lp}    /* Read the ${len}-byte long variable from the buffer */\n'
-                '${lp}    qmi_utils_read_sized_guint_from_buffer (\n'
-                '${lp}        &${buffer_name},\n'
-                '${lp}        &${buffer_len},\n'
-                '${lp}        ${len},\n'
-                '${lp}        ${endian},\n'
-                '${lp}        &tmp);\n'
-                '\n')
+                '${lp}    if (!qmi_message_tlv_read_sized_guint (message, init_offset, &offset, ${len},${endian} &tmp, &error))\n'
+                '${lp}        goto out;\n')
         else:
             template += (
-                '${lp}    /* Read the ${private_format} variable from the buffer */\n'
-                '${lp}    qmi_utils_read_${private_format}_from_buffer (\n'
-                '${lp}        &${buffer_name},\n'
-                '${lp}        &${buffer_len},\n')
-            if self.private_format != 'guint8' and self.private_format != 'gint8' and self.private_format != 'gfloat':
-                template += (
-                    '${lp}        ${endian},\n')
-            template += (
-                '${lp}        &tmp);\n'
-                '\n')
+                '${lp}    if (!qmi_message_tlv_read_${private_format} (message, init_offset, &offset,${endian} &tmp, &error))\n'
+                '${lp}        goto out;\n')
 
         if self.public_format == 'gboolean':
             template += (
-                '${lp}    g_string_append_printf (${printable}, "%s", tmp ? "yes" : "no");\n')
+                '${lp}    g_string_append_printf (printable, "%s", tmp ? "yes" : "no");\n')
         elif self.public_format != self.private_format:
             translations['public_type_underscore'] = utils.build_underscore_name_from_camelcase(self.public_format)
             translations['public_type_underscore_upper'] = utils.build_underscore_name_from_camelcase(self.public_format).upper()
             template += (
                 '#if defined  __${public_type_underscore_upper}_IS_ENUM__\n'
-                '${lp}    g_string_append_printf (${printable}, "%s", ${public_type_underscore}_get_string ((${public_format})tmp));\n'
+                '${lp}    g_string_append_printf (printable, "%s", ${public_type_underscore}_get_string ((${public_format})tmp));\n'
                 '#elif defined  __${public_type_underscore_upper}_IS_FLAGS__\n'
                 '${lp}    {\n'
                 '${lp}        gchar *flags_str;\n'
                 '\n'
                 '${lp}        flags_str = ${public_type_underscore}_build_string_from_mask ((${public_format})tmp);\n'
-                '${lp}        g_string_append_printf (${printable}, "%s", flags_str);\n'
+                '${lp}        g_string_append_printf (printable, "%s", flags_str);\n'
                 '${lp}        g_free (flags_str);\n'
                 '${lp}    }\n'
                 '#else\n'
@@ -286,7 +234,7 @@ class VariableInteger(Variable):
                 '#endif\n')
         else:
             template += (
-                '${lp}    g_string_append_printf (${printable}, "${common_format}", ${common_cast}tmp);\n')
+                '${lp}    g_string_append_printf (printable, "${common_format}", ${common_cast}tmp);\n')
 
         template += (
             '${lp}}\n')
diff --git a/build-aux/qmi-codegen/VariableSequence.py b/build-aux/qmi-codegen/VariableSequence.py
index 03dd2d7..c69a0e6 100644
--- a/build-aux/qmi-codegen/VariableSequence.py
+++ b/build-aux/qmi-codegen/VariableSequence.py
@@ -75,17 +75,9 @@ class VariableSequence(Variable):
     Reading the contents of a sequence is just about reading each of the sequence
     fields one by one.
     """
-    def emit_buffer_read(self, f, line_prefix, variable_name, buffer_name, buffer_len):
+    def emit_buffer_read(self, f, line_prefix, tlv_out, error, variable_name):
         for member in self.members:
-            member['object'].emit_buffer_read(f, line_prefix, variable_name + '_' +  member['name'], buffer_name, buffer_len)
-
-
-    """
-    Emits the code involved in computing the size of the variable.
-    """
-    def emit_size_read(self, f, line_prefix, variable_name, buffer_name, buffer_len):
-        for member in self.members:
-            member['object'].emit_size_read(f, line_prefix, variable_name, buffer_name, buffer_len)
+            member['object'].emit_buffer_read(f, line_prefix, tlv_out, error, variable_name + '_' +  member['name'])
 
 
     """
@@ -101,28 +93,27 @@ class VariableSequence(Variable):
     The sequence will be printed as a list of fields enclosed between square
     brackets
     """
-    def emit_get_printable(self, f, line_prefix, printable, buffer_name, buffer_len):
-        translations = { 'lp'        : line_prefix,
-                         'printable' : printable }
+    def emit_get_printable(self, f, line_prefix):
+        translations = { 'lp' : line_prefix }
 
         template = (
-            '${lp}g_string_append (${printable}, "[");\n')
+            '${lp}g_string_append (printable, "[");\n')
         f.write(string.Template(template).substitute(translations))
 
         for member in self.members:
             translations['variable_name'] = member['name']
             template = (
-                '${lp}g_string_append (${printable}, " ${variable_name} = \'");\n')
+                '${lp}g_string_append (printable, " ${variable_name} = \'");\n')
             f.write(string.Template(template).substitute(translations))
 
-            member['object'].emit_get_printable(f, line_prefix, printable, buffer_name, buffer_len)
+            member['object'].emit_get_printable(f, line_prefix)
 
             template = (
-                '${lp}g_string_append (${printable}, "\'");\n')
+                '${lp}g_string_append (printable, "\'");\n')
             f.write(string.Template(template).substitute(translations))
 
         template = (
-            '${lp}g_string_append (${printable}, " ]");\n')
+            '${lp}g_string_append (printable, " ]");\n')
         f.write(string.Template(template).substitute(translations))
 
 
diff --git a/build-aux/qmi-codegen/VariableString.py b/build-aux/qmi-codegen/VariableString.py
index 44fe50e..355fe4a 100644
--- a/build-aux/qmi-codegen/VariableString.py
+++ b/build-aux/qmi-codegen/VariableString.py
@@ -75,87 +75,24 @@ class VariableString(Variable):
     """
     Read a string from the raw byte buffer.
     """
-    def emit_buffer_read(self, f, line_prefix, variable_name, buffer_name, buffer_len):
-        translations = { 'lp'             : line_prefix,
-                         'variable_name'  : variable_name,
-                         'buffer_name'    : buffer_name,
-                         'buffer_len'     : buffer_len }
+    def emit_buffer_read(self, f, line_prefix, tlv_out, error, variable_name):
+        translations = { 'lp'            : line_prefix,
+                         'tlv_out'       : tlv_out,
+                         'variable_name' : variable_name,
+                         'error'         : error }
 
         if self.is_fixed_size:
             translations['fixed_size'] = self.fixed_size
             template = (
-                '${lp}/* Read the fixed-size string variable from the buffer */\n'
-                '${lp}qmi_utils_read_fixed_size_string_from_buffer (\n'
-                '${lp}    &${buffer_name},\n'
-                '${lp}    &${buffer_len},\n'
-                '${lp}    ${fixed_size},\n'
-                '${lp}    &${variable_name}[0]);\n'
+                '${lp}if (!qmi_message_tlv_read_fixed_size_string (message, init_offset, &offset, ${fixed_size}, &${variable_name}[0], ${error}))\n'
+                '${lp}    goto ${tlv_out};\n'
                 '${lp}${variable_name}[${fixed_size}] = \'\\0\';\n')
         else:
-            translations['length_prefix_size'] = self.length_prefix_size
+            translations['n_size_prefix_bytes'] = self.n_size_prefix_bytes
             translations['max_size'] = self.max_size if self.max_size != '' else '0'
             template = (
-                '${lp}/* Read the string variable from the buffer */\n'
-                '${lp}qmi_utils_read_string_from_buffer (\n'
-                '${lp}    &${buffer_name},\n'
-                '${lp}    &${buffer_len},\n'
-                '${lp}    ${length_prefix_size},\n'
-                '${lp}    ${max_size},\n'
-                '${lp}    &(${variable_name}));\n')
-
-        f.write(string.Template(template).substitute(translations))
-
-
-    """
-    Emits the code involved in computing the size of the variable.
-    """
-    def emit_size_read(self, f, line_prefix, variable_name, buffer_name, buffer_len):
-        translations = { 'lp'            : line_prefix,
-                         'variable_name' : variable_name,
-                         'buffer_name'   : buffer_name,
-                         'buffer_len'    : buffer_len }
-
-        if self.is_fixed_size:
-            translations['fixed_size'] = self.fixed_size
-            template = (
-                '${lp}${variable_name} += ${fixed_size};\n')
-        elif self.length_prefix_size == 0:
-            template = (
-                '${lp}${variable_name} += ${buffer_len};\n')
-        elif self.length_prefix_size == 8:
-            template = (
-                '${lp}{\n'
-                '${lp}    guint8 size8;\n'
-                '${lp}    const guint8 *aux_buffer = &${buffer_name}[${variable_name}];\n'
-                '${lp}    guint16 aux_buffer_len;\n'
-                '\n'
-                '${lp}    aux_buffer_len = ((${buffer_len} >= ${variable_name}) ? ${buffer_len} - ${variable_name} : 0);\n'
-                '${lp}    if (aux_buffer_len < 1) {\n'
-                '${lp}        g_warning ("Cannot read the string size: expected \'1\' bytes, but only got \'%u\' bytes",\n'
-                '${lp}                   aux_buffer_len);\n'
-                '${lp}        return FALSE;\n'
-                '${lp}    }\n'
-                '\n'
-                '${lp}    qmi_utils_read_guint8_from_buffer (&aux_buffer, &aux_buffer_len, &size8);\n'
-                '${lp}    ${variable_name} += (1 + size8);\n'
-                '${lp}}\n')
-        elif self.length_prefix_size == 16:
-            template = (
-                '${lp}{\n'
-                '${lp}    guint16 size16;\n'
-                '${lp}    const guint8 *aux_buffer = &${buffer_name}[${variable_name}];\n'
-                '${lp}    guint16 aux_buffer_len;\n'
-                '\n'
-                '${lp}    aux_buffer_len = ((${buffer_len} >= ${variable_name}) ? ${buffer_len} - ${variable_name} : 0);\n'
-                '${lp}    if (aux_buffer_len < 2) {\n'
-                '${lp}        g_warning ("Cannot read the string size: expected \'2\' bytes, but only got \'%u\' bytes",\n'
-                '${lp}                   aux_buffer_len);\n'
-                '${lp}        return FALSE;\n'
-                '${lp}    }\n'
-                '\n'
-                '${lp}    qmi_utils_read_guint16_from_buffer (&aux_buffer, &aux_buffer_len, QMI_ENDIAN_LITTLE, &size16);\n'
-                '${lp}    ${variable_name} += (2 + size16);\n'
-                '${lp}}\n')
+                '${lp}if (!qmi_message_tlv_read_string (message, init_offset, &offset, ${n_size_prefix_bytes}, ${max_size}, &(${variable_name}), ${error}))\n'
+                '${lp}    goto ${tlv_out};\n')
         f.write(string.Template(template).substitute(translations))
 
 
@@ -181,47 +118,31 @@ class VariableString(Variable):
     """
     Get the string as printable
     """
-    def emit_get_printable(self, f, line_prefix, printable, buffer_name, buffer_len):
-        translations = { 'lp'             : line_prefix,
-                         'printable'      : printable,
-                         'buffer_name'    : buffer_name,
-                         'buffer_len'     : buffer_len }
+    def emit_get_printable(self, f, line_prefix):
+        translations = { 'lp' : line_prefix }
 
         if self.is_fixed_size:
             translations['fixed_size'] = self.fixed_size
-            translations['fixed_size_plus_one'] = int(self.fixed_size) + 1
             template = (
                 '\n'
                 '${lp}{\n'
-                '${lp}    gchar tmp[${fixed_size_plus_one}];\n'
-                '\n'
-                '${lp}    /* Read the fixed-size string variable from the buffer */\n'
-                '${lp}    qmi_utils_read_fixed_size_string_from_buffer (\n'
-                '${lp}        &${buffer_name},\n'
-                '${lp}        &${buffer_len},\n'
-                '${lp}        ${fixed_size},\n'
-                '${lp}        &tmp[0]);\n'
-                '${lp}    tmp[${fixed_size}] = \'\\0\';\n'
+                '${lp}    gchar tmp[${fixed_size}];\n'
                 '\n'
-                '${lp}    g_string_append_printf (${printable}, "%s", tmp);\n'
+                '${lp}    if (!qmi_message_tlv_read_fixed_size_string (message, init_offset, &offset, ${fixed_size}, &tmp[0], &error))\n'
+                '${lp}        goto out;\n'
+                '${lp}    g_string_append_len (printable, tmp, ${fixed_size});\n'
                 '${lp}}\n')
         else:
-            translations['length_prefix_size'] = self.length_prefix_size
+            translations['n_size_prefix_bytes'] = self.n_size_prefix_bytes
             translations['max_size'] = self.max_size if self.max_size != '' else '0'
             template = (
                 '\n'
                 '${lp}{\n'
                 '${lp}    gchar *tmp;\n'
                 '\n'
-                '${lp}    /* Read the string variable from the buffer */\n'
-                '${lp}    qmi_utils_read_string_from_buffer (\n'
-                '${lp}        &${buffer_name},\n'
-                '${lp}        &${buffer_len},\n'
-                '${lp}        ${length_prefix_size},\n'
-                '${lp}        ${max_size},\n'
-                '${lp}        &tmp);\n'
-                '\n'
-                '${lp}    g_string_append_printf (${printable}, "%s", tmp);\n'
+                '${lp}    if (!qmi_message_tlv_read_string (message, init_offset, &offset, ${n_size_prefix_bytes}, ${max_size}, &tmp, &error))\n'
+                '${lp}        goto out;\n'
+                '${lp}    g_string_append (printable, tmp);\n'
                 '${lp}    g_free (tmp);\n'
                 '${lp}}\n')
 
diff --git a/build-aux/qmi-codegen/VariableStruct.py b/build-aux/qmi-codegen/VariableStruct.py
index 1e96e5d..b19b4c6 100644
--- a/build-aux/qmi-codegen/VariableStruct.py
+++ b/build-aux/qmi-codegen/VariableStruct.py
@@ -104,17 +104,9 @@ class VariableStruct(Variable):
     Reading the contents of a struct is just about reading each of the struct
     fields one by one.
     """
-    def emit_buffer_read(self, f, line_prefix, variable_name, buffer_name, buffer_len):
+    def emit_buffer_read(self, f, line_prefix, tlv_out, error, variable_name):
         for member in self.members:
-            member['object'].emit_buffer_read(f, line_prefix, variable_name + '.' +  member['name'], buffer_name, buffer_len)
-
-
-    """
-    Emits the code involved in computing the size of the variable.
-    """
-    def emit_size_read(self, f, line_prefix, variable_name, buffer_name, buffer_len):
-        for member in self.members:
-            member['object'].emit_size_read(f, line_prefix, variable_name, buffer_name, buffer_len)
+            member['object'].emit_buffer_read(f, line_prefix, tlv_out, error, variable_name + '.' +  member['name'])
 
 
     """
@@ -130,28 +122,27 @@ class VariableStruct(Variable):
     The struct will be printed as a list of fields enclosed between square
     brackets
     """
-    def emit_get_printable(self, f, line_prefix, printable, buffer_name, buffer_len):
-        translations = { 'lp'        : line_prefix,
-                         'printable' : printable }
+    def emit_get_printable(self, f, line_prefix):
+        translations = { 'lp' : line_prefix }
 
         template = (
-            '${lp}g_string_append (${printable}, "[");\n')
+            '${lp}g_string_append (printable, "[");\n')
         f.write(string.Template(template).substitute(translations))
 
         for member in self.members:
             translations['variable_name'] = member['name']
             template = (
-                '${lp}g_string_append (${printable}, " ${variable_name} = \'");\n')
+                '${lp}g_string_append (printable, " ${variable_name} = \'");\n')
             f.write(string.Template(template).substitute(translations))
 
-            member['object'].emit_get_printable(f, line_prefix, printable, buffer_name, buffer_len)
+            member['object'].emit_get_printable(f, line_prefix)
 
             template = (
-                '${lp}g_string_append (${printable}, "\'");\n')
+                '${lp}g_string_append (printable, "\'");\n')
             f.write(string.Template(template).substitute(translations))
 
         template = (
-            '${lp}g_string_append (${printable}, " ]");\n')
+            '${lp}g_string_append (printable, " ]");\n')
         f.write(string.Template(template).substitute(translations))