sr: adjust copyright year

[libsigrok.git] / filter.c

diff --git a/filter.c b/filter.c
index 5698d333f0eea57de70aa97c5ca5277a1c2f4312..9c025710656dfa1fb064ced4d364c8acfee219b9 100644 (file)
--- a/filter.c
+++ b/filter.c
@@ -1,7 +1,7 @@
 /*
  * This file is part of the sigrok project.
  *
- * Copyright (C) 2010 Bert Vermeulen <bert@biot.com>
+ * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -20,7 +20,7 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
-#include <sigrok.h>
+#include "sigrok.h"
 #include "sigrok-internal.h"
 
 /**
@@ -53,6 +53,9 @@
  *
  * @param in_unitsize The unit size (>= 1) of the input (data_in).
  * @param out_unitsize The unit size (>= 1) the output shall have (data_out).
+ *                     The requested unit size must be big enough to hold as
+ *                     much data as is specified by the number of enabled
+ *                     probes in 'probelist'.
  * @param probelist Pointer to a list of integers (probe numbers). The probe
  *                  numbers in this list are 1-based, i.e. the first probe
  *                  is expected to be numbered 1 (not 0!). Must not be NULL.
@@ -70,9 +73,10 @@
  *         If something other than SR_OK is returned, the values of
  *         out_unitsize, data_out, and length_out are undefined.
  */
-int sr_filter_probes(int in_unitsize, int out_unitsize, const int *probelist,
-                    const unsigned char *data_in, uint64_t length_in,
-                    char **data_out, uint64_t *length_out)
+SR_API int sr_filter_probes(int in_unitsize, int out_unitsize,
+                           const int *probelist, const unsigned char *data_in,
+                           uint64_t length_in, char **data_out,
+                           uint64_t *length_out)
 {
        unsigned int in_offset, out_offset;
        int num_enabled_probes, out_bit, i;
@@ -98,15 +102,22 @@ int sr_filter_probes(int in_unitsize, int out_unitsize, const int *probelist,
                return SR_ERR_ARG;
        }
 
+       num_enabled_probes = 0;
+       for (i = 0; probelist[i]; i++)
+               num_enabled_probes++;
+
+       /* Are there more probes than the target unit size supports? */
+       if (num_enabled_probes > out_unitsize * 8) {
+               sr_err("filter: %s: too many probes (%d) for the target unit "
+                      "size (%d)", num_enabled_probes, out_unitsize, __func__);
+               return SR_ERR_ARG;
+       }
+
        if (!(*data_out = g_try_malloc(length_in))) {
                sr_err("filter: %s: data_out malloc failed", __func__);
                return SR_ERR_MALLOC;
        }
 
-       num_enabled_probes = 0;
-       for (i = 0; probelist[i]; i++)
-               num_enabled_probes++;
-
        if (num_enabled_probes == in_unitsize * 8) {
                /* All probes are used -- no need to compress anything. */
                memcpy(*data_out, data_in, length_in);