Add compress option to input/vcd.

diff --git a/input/vcd.c b/input/vcd.c
index 3aad3bd89b3c655308723abcce4d993846e73277..138aa3c1526bbebee085de5d4289f8bcda865b3d 100644 (file)
--- a/input/vcd.c
+++ b/input/vcd.c
@@ -37,6 +37,10 @@
  * downsample:  Divide the samplerate by the given factor.
  *              This can speed up analyzing of long captures.
  *
+ * compress:    Compress idle periods longer than this value.
+ *              This can speed up analyzing of long captures.
+ *              Default 0 = don't compress.
+ *
  * Based on Verilog standard IEEE Std 1364-2001 Version C
  *
  * Supported features:
@@ -167,6 +171,7 @@ struct context
        int maxprobes;
        int probecount;
        int downsample;
+       unsigned compress;
        int64_t skip;
        struct probe probes[SR_MAX_NUM_PROBES];
 };
@@ -344,6 +349,11 @@ static int init(struct sr_input *in)
                        }
                }
                
+               param = g_hash_table_lookup(in->param, "compress");
+               if (param) {
+                       ctx->compress = strtoul(param, NULL, 10);
+               }
+               
                param = g_hash_table_lookup(in->param, "skip");
                if (param) {
                        ctx->skip = strtoul(param, NULL, 10) / ctx->downsample;
@@ -447,6 +457,12 @@ static void parse_contents(FILE *file, const struct sr_dev_inst *sdi, struct con
                        }
                        else
                        {
+                               if (ctx->compress != 0 && timestamp - prev_timestamp > ctx->compress)
+                               {
+                                       /* Compress long idle periods */
+                                       prev_timestamp = timestamp - ctx->compress;
+                               }
+                       
                                sr_dbg("New timestamp: %" PRIu64, timestamp);
                        
                                /* Generate samples from prev_timestamp up to timestamp - 1. */