[PATCH v7 10/20] trace-cmd library: Decompress the options section, if it is compressed

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

In trace file version 7, options section can be compressed. Extended
the options handling decompression if needed .

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 lib/trace-cmd/trace-input.c | 45 ++++++++++++++++++++++++++-----------
 1 file changed, 32 insertions(+), 13 deletions(-)

diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index a81112f0..d5295c98 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -3045,6 +3045,7 @@ static int handle_options(struct tracecmd_input *handle)
 	unsigned short id, flags;
 	char *cpustats = NULL;
 	struct hook_list *hook;
+	bool compress = false;
 	char *buf;
 	int cpus;
 	int ret;
@@ -3056,23 +3057,32 @@ static int handle_options(struct tracecmd_input *handle)
 			return -1;
 		if (id != TRACECMD_OPTION_DONE)
 			return -1;
+		if (flags & TRACECMD_SEC_FL_COMPRESS)
+			compress = true;
 	}
 
+	if (compress && in_uncompress_block(handle))
+		return -1;
 	for (;;) {
-		if (read2(handle, &option))
-			return -1;
+		ret = read2(handle, &option);
+		if (ret)
+			goto out;
 
 		if (!HAS_SECTIONS(handle) && option == TRACECMD_OPTION_DONE)
 			break;
 
 		/* next 4 bytes is the size of the option */
-		if (read4(handle, &size))
-			return -1;
+		ret = read4(handle, &size);
+		if (ret)
+			goto out;
 		buf = malloc(size);
-		if (!buf)
-			return -ENOMEM;
-		if (do_read_check(handle, buf, size))
-			return -1;
+		if (!buf) {
+			ret = -ENOMEM;
+			goto out;
+		}
+		ret = do_read_check(handle, buf, size);
+		if (ret)
+			goto out;
 
 		switch (option) {
 		case TRACECMD_OPTION_DATE:
@@ -3126,15 +3136,17 @@ static int handle_options(struct tracecmd_input *handle)
 							     buf + 8, 4);
 			ret = tsync_cpu_offsets_load(handle, buf + 12, size - 12);
 			if (ret < 0)
-				return ret;
+				goto out;
 			tracecmd_enable_tsync(handle, true);
 			break;
 		case TRACECMD_OPTION_CPUSTAT:
 			buf[size-1] = '\n';
 			cpustats = realloc(handle->cpustats,
 					   handle->cpustats_size + size + 1);
-			if (!cpustats)
-				return -ENOMEM;
+			if (!cpustats) {
+				ret = -ENOMEM;
+				goto out;
+			}
 			memcpy(cpustats + handle->cpustats_size, buf, size);
 			handle->cpustats_size += size;
 			cpustats[handle->cpustats_size] = 0;
@@ -3144,7 +3156,7 @@ static int handle_options(struct tracecmd_input *handle)
 		case TRACECMD_OPTION_BUFFER_TEXT:
 			ret = handle_buffer_option(handle, option, buf, size);
 			if (ret < 0)
-				return ret;
+				goto out;
 			break;
 		case TRACECMD_OPTION_TRACECLOCK:
 			if (!handle->ts2secs)
@@ -3203,6 +3215,8 @@ static int handle_options(struct tracecmd_input *handle)
 					      tep_read_number(handle->pevent, buf, 8), 0);
 			break;
 		case TRACECMD_OPTION_DONE:
+			if (compress)
+				in_uncompress_reset(handle);
 			ret = handle_option_done(handle, buf, size);
 			free(buf);
 			return ret;
@@ -3216,7 +3230,12 @@ static int handle_options(struct tracecmd_input *handle)
 
 	}
 
-	return 0;
+	ret = 0;
+
+out:
+	if (compress)
+		in_uncompress_reset(handle);
+	return ret;
 }
 
 static int read_options_type(struct tracecmd_input *handle)
-- 
2.34.1