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JSON: use the json builder instead of memstream and fprintf

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Use the JSON builder to prepare arguments for modules and metadata
instead of custom memopen and fprintf. This makes it easier to ensure
the strings are all properly escaped.

This removes the use of spa_json_encode_string(), which could return a
truncated, non-zero terminated result, which we needed to check
everywhere.
This commit is contained in:
Wim Taymans 2026-04-30 13:23:23 +02:00
parent 4ddedc72cd
commit 96c3ada6f2
38 changed files with 661 additions and 528 deletions
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40
src/tools/pw-loopback.c
View file

@ -15,7 +15,7 @@
#include <spa/pod/builder.h>
#include <spa/param/audio/format-utils.h>
#include <spa/param/audio/raw.h>
#include <spa/utils/json.h>
#include <spa/utils/json-builder.h>
#include <spa/debug/file.h>
#include <pipewire/pipewire.h>
@ -92,10 +92,10 @@ int main(int argc, char *argv[])
struct data data = { 0 };
struct pw_loop *l;
const char *opt_remote = NULL, *remote_name;
char cname[256], value[256];
char cname[256];
struct spa_json_builder b;
char *args;
size_t size;
FILE *f;
static const struct option long_options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
@ -214,42 +214,44 @@ int main(int argc, char *argv[])
}
if ((f = open_memstream(&args, &size)) == NULL) {
if ((res = spa_json_builder_memstream(&b, &args, &size, 0)) < 0) {
fprintf(stderr, "can't open memstream: %m\n");
goto exit;
}
fprintf(f, "{");
remote_name = "[" PW_DEFAULT_REMOTE "-manager," PW_DEFAULT_REMOTE "]";
if (opt_remote)
remote_name = opt_remote;
fprintf(f, " remote.name = \"%s\"", remote_name);
spa_json_builder_array_push(&b, "{");
spa_json_builder_object_string(&b, "remote.name", remote_name);
if (data.latency != 0)
fprintf(f, " node.latency = %u/%u", data.latency, DEFAULT_RATE);
spa_json_builder_object_stringf(&b, "node.latency", "%u/%u",
data.latency, DEFAULT_RATE);
if (data.delay != 0.0f)
fprintf(f, " target.delay.sec = %s",
spa_json_format_float(value, sizeof(value), data.delay));
spa_json_builder_object_double(&b, "target.delay.sec", data.delay);
if (data.channels != 0)
fprintf(f, " audio.channels = %u", data.channels);
spa_json_builder_object_uint(&b, "audio.channels", data.channels);
if (data.opt_channel_map != NULL)
fprintf(f, " audio.position = %s", data.opt_channel_map);
spa_json_builder_object_value(&b, true, "audio.position", data.opt_channel_map);
if (data.opt_node_name != NULL)
fprintf(f, " node.name = %s", data.opt_node_name);
spa_json_builder_object_string(&b, "node.name", data.opt_node_name);
if (data.opt_group_name != NULL) {
pw_properties_set(data.capture_props, PW_KEY_NODE_GROUP, data.opt_group_name);
pw_properties_set(data.playback_props, PW_KEY_NODE_GROUP, data.opt_group_name);
}
fprintf(f, " capture.props = {");
pw_properties_serialize_dict(f, &data.capture_props->dict, 0);
fprintf(f, " } playback.props = {");
pw_properties_serialize_dict(f, &data.playback_props->dict, 0);
fprintf(f, " } }");
fclose(f);
spa_json_builder_object_push(&b, "capture.props", "{");
pw_properties_serialize_dict(b.f, &data.capture_props->dict, 0);
spa_json_builder_pop(&b, "}");
spa_json_builder_object_push(&b, "playback.props", "{");
pw_properties_serialize_dict(b.f, &data.playback_props->dict, 0);
spa_json_builder_pop(&b, "}");
spa_json_builder_pop(&b, "}");
spa_json_builder_close(&b);
pw_log_info("loading module with %s", args);