Refactor the variable I/O buffer size feature
Reduce code duplication to simplify the feature and reduce code size.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index a1a5859..4a57e76 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -260,6 +260,70 @@
return 0;
}
+
+static void handle_buffer_resizing( mbedtls_ssl_context *ssl, int downsizing,
+ uint32_t in_buf_new_len,
+ uint32_t out_buf_new_len )
+{
+ int modified = 0;
+ size_t written_in = 0, iv_offset_in = 0, len_offset_in = 0;
+ size_t written_out = 0, iv_offset_out = 0, len_offset_out = 0;
+ if( ssl->in_buf != NULL )
+ {
+ written_in = ssl->in_msg - ssl->in_buf;
+ iv_offset_in = ssl->in_iv - ssl->in_buf;
+ len_offset_in = ssl->in_len - ssl->in_buf;
+ if( downsizing ?
+ ssl->in_buf_len > in_buf_new_len && ssl->in_left < in_buf_new_len :
+ ssl->in_buf_len < in_buf_new_len )
+ {
+ if( resize_buffer( &ssl->in_buf, in_buf_new_len, &ssl->in_buf_len ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "input buffer resizing failed - out of memory" ) );
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reallocating in_buf to %d", in_buf_new_len ) );
+ modified = 1;
+ }
+ }
+ }
+
+ if( ssl->out_buf != NULL )
+ {
+ written_out = ssl->out_msg - ssl->out_buf;
+ iv_offset_out = ssl->out_iv - ssl->out_buf;
+ len_offset_out = ssl->out_len - ssl->out_buf;
+ if( downsizing ?
+ ssl->out_buf_len > out_buf_new_len && ssl->out_left < out_buf_new_len :
+ ssl->out_buf_len < out_buf_new_len )
+ {
+ if( resize_buffer( &ssl->out_buf, out_buf_new_len, &ssl->out_buf_len ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "output buffer resizing failed - out of memory" ) );
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reallocating out_buf to %d", out_buf_new_len ) );
+ modified = 1;
+ }
+ }
+ }
+ if( modified )
+ {
+ /* Update pointers here to avoid doing it twice. */
+ mbedtls_ssl_reset_in_out_pointers( ssl );
+ /* Fields below might not be properly updated with record
+ * splitting or with CID, so they are manually updated here. */
+ ssl->out_msg = ssl->out_buf + written_out;
+ ssl->out_len = ssl->out_buf + len_offset_out;
+ ssl->out_iv = ssl->out_buf + iv_offset_out;
+
+ ssl->in_msg = ssl->in_buf + written_in;
+ ssl->in_len = ssl->in_buf + len_offset_in;
+ ssl->in_iv = ssl->in_buf + iv_offset_in;
+ }
+}
#endif /* MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH */
/*
@@ -3686,64 +3750,9 @@
}
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
/* If the buffers are too small - reallocate */
- {
- int modified = 0;
- size_t written_in = 0, iv_offset_in = 0, len_offset_in = 0;
- size_t written_out = 0, iv_offset_out = 0, len_offset_out = 0;
- if( ssl->in_buf != NULL )
- {
- written_in = ssl->in_msg - ssl->in_buf;
- iv_offset_in = ssl->in_iv - ssl->in_buf;
- len_offset_in = ssl->in_len - ssl->in_buf;
- if( ssl->in_buf_len < MBEDTLS_SSL_IN_BUFFER_LEN )
- {
- if( resize_buffer( &ssl->in_buf, MBEDTLS_SSL_IN_BUFFER_LEN,
- &ssl->in_buf_len ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "input buffer resizing failed - out of memory" ) );
- }
- else
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reallocating in_buf to %d", MBEDTLS_SSL_IN_BUFFER_LEN ) );
- modified = 1;
- }
- }
- }
- if( ssl->out_buf != NULL )
- {
- written_out = ssl->out_msg - ssl->out_buf;
- iv_offset_out = ssl->out_iv - ssl->out_buf;
- len_offset_out = ssl->out_len - ssl->out_buf;
- if( ssl->out_buf_len < MBEDTLS_SSL_OUT_BUFFER_LEN )
- {
- if( resize_buffer( &ssl->out_buf, MBEDTLS_SSL_OUT_BUFFER_LEN,
- &ssl->out_buf_len ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "output buffer resizing failed - out of memory" ) );
- }
- else
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reallocating out_buf to %d", MBEDTLS_SSL_OUT_BUFFER_LEN ) );
- modified = 1;
- }
- }
- }
- if( modified )
- {
- /* Update pointers here to avoid doing it twice. */
- mbedtls_ssl_reset_in_out_pointers( ssl );
- /* Fields below might not be properly updated with record
- * splitting or with CID, so they are manually updated here. */
- ssl->out_msg = ssl->out_buf + written_out;
- ssl->out_len = ssl->out_buf + len_offset_out;
- ssl->out_iv = ssl->out_buf + iv_offset_out;
-
- ssl->in_msg = ssl->in_buf + written_in;
- ssl->in_len = ssl->in_buf + len_offset_in;
- ssl->in_iv = ssl->in_buf + iv_offset_in;
- }
- }
+ handle_buffer_resizing( ssl, 0, MBEDTLS_SSL_IN_BUFFER_LEN,
+ MBEDTLS_SSL_OUT_BUFFER_LEN );
#endif
/* All pointers should exist and can be directly freed without issue */
@@ -6068,66 +6077,8 @@
* processes datagrams and the fact that a datagram is allowed to have
* several records in it, it is possible that the I/O buffers are not
* empty at this stage */
- {
- int modified = 0;
- uint32_t buf_len = mbedtls_ssl_get_input_buflen( ssl );
- size_t written_in = 0, iv_offset_in = 0, len_offset_in = 0;
- size_t written_out = 0, iv_offset_out = 0, len_offset_out = 0;
- if( ssl->in_buf != NULL )
- {
- written_in = ssl->in_msg - ssl->in_buf;
- iv_offset_in = ssl->in_iv - ssl->in_buf;
- len_offset_in = ssl->in_len - ssl->in_buf;
- if( ssl->in_buf_len > buf_len && ssl->in_left < buf_len )
- {
- if( resize_buffer( &ssl->in_buf, buf_len, &ssl->in_buf_len ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "input buffer resizing failed - out of memory" ) );
- }
- else
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reallocating in_buf to %d", buf_len ) );
- modified = 1;
- }
- }
- }
-
-
- buf_len = mbedtls_ssl_get_output_buflen( ssl );
- if(ssl->out_buf != NULL )
- {
- written_out = ssl->out_msg - ssl->out_buf;
- iv_offset_out = ssl->out_iv - ssl->out_buf;
- len_offset_out = ssl->out_len - ssl->out_buf;
- if( ssl->out_buf_len > mbedtls_ssl_get_output_buflen( ssl ) &&
- ssl->out_left < buf_len )
- {
- if( resize_buffer( &ssl->out_buf, buf_len, &ssl->out_buf_len ) != 0 )
- {
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "output buffer resizing failed - out of memory" ) );
- }
- else
- {
- MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reallocating out_buf to %d", buf_len ) );
- modified = 1;
- }
- }
- }
- if( modified )
- {
- /* Update pointers here to avoid doing it twice. */
- mbedtls_ssl_reset_in_out_pointers( ssl );
- /* Fields below might not be properly updated with record
- * splitting or with CID, so they are manually updated here. */
- ssl->out_msg = ssl->out_buf + written_out;
- ssl->out_len = ssl->out_buf + len_offset_out;
- ssl->out_iv = ssl->out_buf + iv_offset_out;
-
- ssl->in_msg = ssl->in_buf + written_in;
- ssl->in_len = ssl->in_buf + len_offset_in;
- ssl->in_iv = ssl->in_buf + iv_offset_in;
- }
- }
+ handle_buffer_resizing( ssl, 1, mbedtls_ssl_get_input_buflen( ssl ),
+ mbedtls_ssl_get_output_buflen( ssl ) );
#endif
}
