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gnss: truncate temporary file before download
A temporary file is used to download the GNSS assistance data. It's created and truncated at initialization, but not truncated when a re-upload is necessary (when data expires). This causes to corrupt the GNSS assistance data if the new downloaded data is smaller than the previous download.
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@@ -191,6 +191,8 @@ static void fetch_assistance_data(struct EG25Manager *manager)
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/* Fetch assistance data with curl */
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tmp_file = fdopen(manager->gnss_assistance_fd, "wb+");
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lseek(manager->gnss_assistance_fd, 0, SEEK_SET);
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ftruncate(manager->gnss_assistance_fd, 0);
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url = g_strconcat(manager->gnss_assistance_url, "/",
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manager->gnss_assistance_file, NULL);
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curl = curl_easy_init();
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