diff --git a/addons/deviceatlas/da.c b/addons/deviceatlas/da.c
new file mode 100644
index 0000000..4189092
--- /dev/null
+++ b/addons/deviceatlas/da.c
@@ -0,0 +1,426 @@
+#include <stdio.h>
+
+#include <haproxy/api.h>
+#include <haproxy/arg.h>
+#include <haproxy/cfgparse.h>
+#include <haproxy/errors.h>
+#include <haproxy/global.h>
+#include <haproxy/http.h>
+#include <haproxy/http_ana.h>
+#include <haproxy/http_fetch.h>
+#include <haproxy/http_htx.h>
+#include <haproxy/htx.h>
+#include <haproxy/sample.h>
+#include <haproxy/tools.h>
+#include <dac.h>
+
+static struct {
+	void *atlasimgptr;
+	char *jsonpath;
+	char *cookiename;
+	size_t cookienamelen;
+	da_atlas_t atlas;
+	da_evidence_id_t useragentid;
+	da_severity_t loglevel;
+	char separator;
+	unsigned char daset:1;
+} global_deviceatlas = {
+	.loglevel = 0,
+	.jsonpath = 0,
+	.cookiename = 0,
+	.cookienamelen = 0,
+	.useragentid = 0,
+	.daset = 0,
+	.separator = '|',
+};
+
+static int da_json_file(char **args, int section_type, struct proxy *curpx,
+                        const struct proxy *defpx, const char *file, int line,
+                        char **err)
+{
+	if (*(args[1]) == 0) {
+		memprintf(err, "deviceatlas json file : expects a json path.\n");
+		return -1;
+	}
+	global_deviceatlas.jsonpath = strdup(args[1]);
+	return 0;
+}
+
+static int da_log_level(char **args, int section_type, struct proxy *curpx,
+                        const struct proxy *defpx, const char *file, int line,
+                        char **err)
+{
+	int loglevel;
+	if (*(args[1]) == 0) {
+		memprintf(err, "deviceatlas log level : expects an integer argument.\n");
+		return -1;
+	}
+
+	loglevel = atol(args[1]);
+	if (loglevel < 0 || loglevel > 3) {
+		memprintf(err, "deviceatlas log level : expects a log level between 0 and 3, %s given.\n", args[1]);
+	} else {
+		global_deviceatlas.loglevel = (da_severity_t)loglevel;
+	}
+
+	return 0;
+}
+
+static int da_property_separator(char **args, int section_type, struct proxy *curpx,
+                                 const struct proxy *defpx, const char *file, int line,
+                                 char **err)
+{
+	if (*(args[1]) == 0) {
+		memprintf(err, "deviceatlas property separator : expects a character argument.\n");
+		return -1;
+	}
+	global_deviceatlas.separator = *args[1];
+	return 0;
+}
+
+static int da_properties_cookie(char **args, int section_type, struct proxy *curpx,
+                          const struct proxy *defpx, const char *file, int line,
+                          char **err)
+{
+	if (*(args[1]) == 0) {
+		memprintf(err, "deviceatlas cookie name : expects a string argument.\n");
+		return -1;
+	} else {
+		global_deviceatlas.cookiename = strdup(args[1]);
+	}
+	global_deviceatlas.cookienamelen = strlen(global_deviceatlas.cookiename);
+	return 0;
+}
+
+static size_t da_haproxy_read(void *ctx, size_t len, char *buf)
+{
+	return fread(buf, 1, len, ctx);
+}
+
+static da_status_t da_haproxy_seek(void *ctx, off_t off)
+{
+	return fseek(ctx, off, SEEK_SET) != -1 ? DA_OK : DA_SYS;
+}
+
+static void da_haproxy_log(da_severity_t severity, da_status_t status,
+	const char *fmt, va_list args)
+{
+	if (global_deviceatlas.loglevel && severity <= global_deviceatlas.loglevel) {
+		char logbuf[256];
+		vsnprintf(logbuf, sizeof(logbuf), fmt, args);
+		ha_warning("deviceatlas : %s.\n", logbuf);
+	}
+}
+
+#define	DA_COOKIENAME_DEFAULT		"DAPROPS"
+
+/*
+ * module init / deinit functions. Returns 0 if OK, or a combination of ERR_*.
+ */
+static int init_deviceatlas(void)
+{
+	int err_code = ERR_NONE;
+
+	if (global_deviceatlas.jsonpath != 0) {
+		FILE *jsonp;
+		da_property_decl_t extraprops[] = {{0, 0}};
+		size_t atlasimglen;
+		da_status_t status;
+
+		jsonp = fopen(global_deviceatlas.jsonpath, "r");
+		if (jsonp == 0) {
+			ha_alert("deviceatlas : '%s' json file has invalid path or is not readable.\n",
+				 global_deviceatlas.jsonpath);
+			err_code |= ERR_ALERT | ERR_FATAL;
+			goto out;
+		}
+
+		da_init();
+		da_seterrorfunc(da_haproxy_log);
+		status = da_atlas_compile(jsonp, da_haproxy_read, da_haproxy_seek,
+			&global_deviceatlas.atlasimgptr, &atlasimglen);
+		fclose(jsonp);
+		if (status != DA_OK) {
+			ha_alert("deviceatlas : '%s' json file is invalid.\n",
+				 global_deviceatlas.jsonpath);
+			err_code |= ERR_ALERT | ERR_FATAL;
+			goto out;
+		}
+
+		status = da_atlas_open(&global_deviceatlas.atlas, extraprops,
+			global_deviceatlas.atlasimgptr, atlasimglen);
+
+		if (status != DA_OK) {
+			ha_alert("deviceatlas : data could not be compiled.\n");
+			err_code |= ERR_ALERT | ERR_FATAL;
+			goto out;
+		}
+
+		if (global_deviceatlas.cookiename == 0) {
+			global_deviceatlas.cookiename = strdup(DA_COOKIENAME_DEFAULT);
+			global_deviceatlas.cookienamelen = strlen(global_deviceatlas.cookiename);
+		}
+
+		global_deviceatlas.useragentid = da_atlas_header_evidence_id(&global_deviceatlas.atlas,
+			"user-agent");
+		global_deviceatlas.daset = 1;
+
+		fprintf(stdout, "Deviceatlas module loaded.\n");
+	}
+
+out:
+	return err_code;
+}
+
+static void deinit_deviceatlas(void)
+{
+	if (global_deviceatlas.jsonpath != 0) {
+		free(global_deviceatlas.jsonpath);
+	}
+
+	if (global_deviceatlas.daset == 1) {
+		free(global_deviceatlas.cookiename);
+		da_atlas_close(&global_deviceatlas.atlas);
+		free(global_deviceatlas.atlasimgptr);
+	}
+
+	da_fini();
+}
+
+static int da_haproxy(const struct arg *args, struct sample *smp, da_deviceinfo_t *devinfo)
+{
+	struct buffer *tmp;
+	da_propid_t prop, *pprop;
+	da_status_t status;
+	da_type_t proptype;
+	const char *propname;
+	int i;
+
+	tmp = get_trash_chunk();
+	chunk_reset(tmp);
+
+	propname = (const char *) args[0].data.str.area;
+	i = 0;
+
+	for (; propname != 0; i ++,
+	     propname = (const char *) args[i].data.str.area) {
+		status = da_atlas_getpropid(&global_deviceatlas.atlas,
+			propname, &prop);
+		if (status != DA_OK) {
+			chunk_appendf(tmp, "%c", global_deviceatlas.separator);
+			continue;
+		}
+		pprop = &prop;
+		da_atlas_getproptype(&global_deviceatlas.atlas, *pprop, &proptype);
+
+		switch (proptype) {
+			case DA_TYPE_BOOLEAN: {
+				bool val;
+				status = da_getpropboolean(devinfo, *pprop, &val);
+				if (status == DA_OK) {
+					chunk_appendf(tmp, "%d", val);
+				}
+				break;
+			}
+			case DA_TYPE_INTEGER:
+			case DA_TYPE_NUMBER: {
+				long val;
+				status = da_getpropinteger(devinfo, *pprop, &val);
+				if (status == DA_OK) {
+					chunk_appendf(tmp, "%ld", val);
+				}
+				break;
+			}
+			case DA_TYPE_STRING: {
+				const char *val;
+				status = da_getpropstring(devinfo, *pprop, &val);
+				if (status == DA_OK) {
+					chunk_appendf(tmp, "%s", val);
+				}
+				break;
+		        }
+		    default:
+			break;
+		}
+
+		chunk_appendf(tmp, "%c", global_deviceatlas.separator);
+	}
+
+	da_close(devinfo);
+
+	if (tmp->data) {
+		--tmp->data;
+		tmp->area[tmp->data] = 0;
+	}
+
+	smp->data.u.str.area = tmp->area;
+	smp->data.u.str.data = tmp->data;
+	smp->data.type = SMP_T_STR;
+
+	return 1;
+}
+
+static int da_haproxy_conv(const struct arg *args, struct sample *smp, void *private)
+{
+	da_deviceinfo_t devinfo;
+	da_status_t status;
+	const char *useragent;
+	char useragentbuf[1024] = { 0 };
+	int i;
+
+	if (global_deviceatlas.daset == 0 || smp->data.u.str.data == 0) {
+		return 1;
+	}
+
+	i = smp->data.u.str.data > sizeof(useragentbuf) ? sizeof(useragentbuf) : smp->data.u.str.data;
+	memcpy(useragentbuf, smp->data.u.str.area, i - 1);
+	useragentbuf[i - 1] = 0;
+
+	useragent = (const char *)useragentbuf;
+
+	status = da_search(&global_deviceatlas.atlas, &devinfo,
+		global_deviceatlas.useragentid, useragent, 0);
+
+	return status != DA_OK ? 0 : da_haproxy(args, smp, &devinfo);
+}
+
+#define DA_MAX_HEADERS       24
+
+static int da_haproxy_fetch(const struct arg *args, struct sample *smp, const char *kw, void *private)
+{
+	da_evidence_t ev[DA_MAX_HEADERS];
+	da_deviceinfo_t devinfo;
+	da_status_t status;
+	struct channel *chn;
+	struct htx *htx;
+	struct htx_blk *blk;
+	char vbuf[DA_MAX_HEADERS][1024] = {{ 0 }};
+	int i, nbh = 0;
+
+	if (global_deviceatlas.daset == 0) {
+		return 0;
+	}
+
+	chn = (smp->strm ? &smp->strm->req : NULL);
+	htx = smp_prefetch_htx(smp, chn, NULL, 1);
+	if (!htx)
+		return 0;
+
+	i = 0;
+	for (blk = htx_get_first_blk(htx); nbh < DA_MAX_HEADERS && blk; blk = htx_get_next_blk(htx, blk)) {
+		size_t vlen;
+		char *pval;
+		da_evidence_id_t evid;
+		enum htx_blk_type type;
+		struct ist n, v;
+		char hbuf[24] = { 0 };
+		char tval[1024] = { 0 };
+
+		type = htx_get_blk_type(blk);
+
+		if (type == HTX_BLK_HDR) {
+			n = htx_get_blk_name(htx, blk);
+			v = htx_get_blk_value(htx, blk);
+		} else if (type == HTX_BLK_EOH) {
+			break;
+		} else {
+			continue;
+		}
+
+		/* The HTTP headers used by the DeviceAtlas API are not longer */
+		if (n.len >= sizeof(hbuf)) {
+			continue;
+		}
+
+		memcpy(hbuf, n.ptr, n.len);
+		hbuf[n.len] = 0;
+		pval = v.ptr;
+		vlen = v.len;
+		evid = -1;
+		i = v.len > sizeof(tval) - 1 ? sizeof(tval) - 1 : v.len;
+		memcpy(tval, v.ptr, i);
+		tval[i] = 0;
+		pval = tval;
+
+		if (strcasecmp(hbuf, "Accept-Language") == 0) {
+			evid = da_atlas_accept_language_evidence_id(&global_deviceatlas.atlas);
+		} else if (strcasecmp(hbuf, "Cookie") == 0) {
+			char *p, *eval;
+			size_t pl;
+
+			eval = pval + vlen;
+			/**
+			 * The cookie value, if it exists, is located between the current header's
+			 * value position and the next one
+			 */
+			if (http_extract_cookie_value(pval, eval, global_deviceatlas.cookiename,
+						      global_deviceatlas.cookienamelen, 1, &p, &pl) == NULL) {
+				continue;
+			}
+
+			vlen -= global_deviceatlas.cookienamelen - 1;
+			pval = p;
+			evid = da_atlas_clientprop_evidence_id(&global_deviceatlas.atlas);
+		} else {
+			evid = da_atlas_header_evidence_id(&global_deviceatlas.atlas, hbuf);
+		}
+
+		if (evid == -1) {
+			continue;
+		}
+
+		i = vlen > sizeof(vbuf[nbh]) - 1 ? sizeof(vbuf[nbh]) - 1 : vlen;
+		memcpy(vbuf[nbh], pval, i);
+		vbuf[nbh][i] = 0;
+		ev[nbh].key = evid;
+		ev[nbh].value = vbuf[nbh];
+		++ nbh;
+	}
+
+	status = da_searchv(&global_deviceatlas.atlas, &devinfo,
+			ev, nbh);
+
+	return status != DA_OK ? 0 : da_haproxy(args, smp, &devinfo);
+}
+
+static struct cfg_kw_list dacfg_kws = {{ }, {
+	{ CFG_GLOBAL, "deviceatlas-json-file",	  da_json_file },
+		{ CFG_GLOBAL, "deviceatlas-log-level",	  da_log_level },
+		{ CFG_GLOBAL, "deviceatlas-property-separator", da_property_separator },
+		{ CFG_GLOBAL, "deviceatlas-properties-cookie", da_properties_cookie },
+		{ 0, NULL, NULL },
+}};
+
+INITCALL1(STG_REGISTER, cfg_register_keywords, &dacfg_kws);
+
+/* Note: must not be declared <const> as its list will be overwritten */
+static struct sample_fetch_kw_list fetch_kws = {ILH, {
+	{ "da-csv-fetch", da_haproxy_fetch, ARG12(1,STR,STR,STR,STR,STR,STR,STR,STR,STR,STR,STR,STR), NULL, SMP_T_STR, SMP_USE_HRQHV },
+		{ NULL, NULL, 0, 0, 0 },
+}};
+
+INITCALL1(STG_REGISTER, sample_register_fetches, &fetch_kws);
+
+/* Note: must not be declared <const> as its list will be overwritten */
+static struct sample_conv_kw_list conv_kws = {ILH, {
+	{ "da-csv-conv", da_haproxy_conv, ARG12(1,STR,STR,STR,STR,STR,STR,STR,STR,STR,STR,STR,STR), NULL, SMP_T_STR, SMP_T_STR },
+		{ NULL, NULL, 0, 0, 0 },
+}};
+
+static void da_haproxy_register_build_options()
+{
+	char *ptr = NULL;
+
+#ifdef MOBI_DA_DUMMY_LIBRARY
+	memprintf(&ptr, "Built with DeviceAtlas support (dummy library only).");
+#else
+	memprintf(&ptr, "Built with DeviceAtlas support (library version %u.%u).", MOBI_DA_MAJOR, MOBI_DA_MINOR);
+#endif
+	hap_register_build_opts(ptr, 1);
+}
+
+INITCALL1(STG_REGISTER, sample_register_convs, &conv_kws);
+
+REGISTER_POST_CHECK(init_deviceatlas);
+REGISTER_POST_DEINIT(deinit_deviceatlas);
+INITCALL0(STG_REGISTER, da_haproxy_register_build_options);
diff --git a/addons/deviceatlas/dummy/Makefile b/addons/deviceatlas/dummy/Makefile
new file mode 100644
index 0000000..8bba840
--- /dev/null
+++ b/addons/deviceatlas/dummy/Makefile
@@ -0,0 +1,12 @@
+# makefile for dummy DeviceAtlas library
+#
+# To enable the DeviceAtlas module support, the following are needed
+# make TARGET=<target> DEVICEATLAS_SRC=addons/deviceatlas/dummy USE_PCRE=1 USE_DEVICEATLAS=1
+
+build: libda.a
+
+libda.a: dac.o
+	ar rv $@ $<
+
+clean:
+	rm -rf *.a *.o
diff --git a/addons/deviceatlas/dummy/dac.c b/addons/deviceatlas/dummy/dac.c
new file mode 100644
index 0000000..720dc6a
--- /dev/null
+++ b/addons/deviceatlas/dummy/dac.c
@@ -0,0 +1,222 @@
+#include "dac.h"
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+static char const __attribute__((unused)) rcsid[] = "$Id: dac.c, v dummy 1970/01/01 00:00:01 dcarlier Exp $";
+
+struct da_bitset {
+    unsigned long bits[8];
+    size_t bit_count;
+};
+
+/*
+ * Constructor/Destructor for possible globals.
+ */
+
+void
+da_init()
+{
+}
+
+void
+da_fini()
+{
+}
+
+
+void
+da_seterrorfunc(da_errorfunc_t callback)
+{
+}
+
+const char *
+da_typename(da_type_t fieldtype)
+{
+   return "none";
+}
+
+char *
+da_getdataversion(da_atlas_t *atlas)
+{
+    return "dummy library version 1.0";
+}
+
+time_t
+da_getdatacreation(da_atlas_t *atlas)
+{
+    return time(NULL);
+}
+
+int
+da_getdatarevision(da_atlas_t *atlas)
+{
+    return 1;
+}
+
+da_status_t
+da_atlas_compile(void *ctx, da_read_fn readfn, da_setpos_fn rewind, void **ptr, size_t *size)
+{
+    return DA_OK;
+}
+
+da_status_t
+da_atlas_open(da_atlas_t *atlas, da_property_decl_t *extraprops, const void *ptr, size_t len)
+{
+    void *ptr2 = malloc(len);
+    free(ptr2);
+    return ptr2 ? DA_OK : DA_NOMEM;
+}
+
+void
+da_atlas_close(da_atlas_t *atlas)
+{
+}
+
+da_evidence_id_t
+da_atlas_clientprop_evidence_id(const da_atlas_t *atlas)
+{
+    return (da_evidence_id_t)2;
+}
+
+da_evidence_id_t
+da_atlas_accept_language_evidence_id(const da_atlas_t *atlas)
+{
+    return (da_evidence_id_t)3;
+}
+
+da_evidence_id_t
+da_atlas_header_evidence_id(const da_atlas_t *atlas, const char *evidence_name)
+{
+    return (da_evidence_id_t)1;
+}
+
+da_status_t
+da_atlas_getproptype(const da_atlas_t *atlas, da_propid_t propid, da_type_t *type)
+{
+    *type = DA_TYPE_BOOLEAN;
+    return DA_OK;
+}
+
+da_status_t
+da_atlas_getpropname(const da_atlas_t *atlas, da_propid_t propid, const char **name)
+{
+    *name = "isRobot";
+    return DA_OK;
+}
+
+da_status_t
+da_atlas_getpropid(const da_atlas_t *atlas, const char *propname, da_propid_t *property)
+{
+    *property = (da_propid_t)1;
+    return DA_OK;
+}
+
+size_t
+da_atlas_getpropcount(const da_atlas_t *atlas)
+{
+    return 1;
+}
+
+void
+da_atlas_setconfig(da_atlas_t *atlas, da_config_t *config)
+{
+}
+
+da_status_t
+da_searchv(const da_atlas_t *atlas, da_deviceinfo_t *result, da_evidence_t *evidence, size_t count)
+{
+    memset(result, 0, sizeof(*result));
+    result->propcount = count;
+    return DA_OK;
+}
+
+da_status_t
+da_search(const da_atlas_t *atlas, da_deviceinfo_t *result, ...)
+{
+    da_evidence_t vec[4]; /* XXX: this will have to grow if more evidence is supported. */
+    size_t i;
+    va_list args;
+    va_start(args, result);
+    for (i = 0; i < sizeof vec / sizeof vec[0];) {
+        vec[i].key = va_arg(args, da_evidence_id_t);
+        if (vec[i].key == 0)
+            break;
+        vec[i++].value = va_arg(args, char *);
+    }
+    va_end(args);
+    return da_searchv(atlas, result, vec, i);
+}
+
+/*
+ * Search-result centric functions.
+ */
+size_t
+da_getpropcount(const da_deviceinfo_t *info)
+{
+    return info->propcount;
+}
+
+da_status_t
+da_getfirstprop(const da_deviceinfo_t *info, da_propid_t **propid)
+{
+    if (info->propcount == 0)
+        return DA_NOMORE;
+    *propid = &info->proplist[0];
+    return DA_OK;
+}
+
+da_status_t
+da_getnextprop(const da_deviceinfo_t *info, da_propid_t **propid)
+{
+    if (*propid - info->proplist >= info->propcount - 1)
+        return DA_NOMORE;
+    ++*propid;
+    return DA_OK;
+}
+
+void
+da_close(da_deviceinfo_t *sr)
+{
+}
+
+da_status_t
+da_getpropname(const da_deviceinfo_t *info, da_propid_t propid, const char **name)
+{
+    *name = "isRobot";
+    return DA_OK;
+}
+
+da_status_t
+da_getproptype(const da_deviceinfo_t *info, da_propid_t propid, da_type_t *type)
+{
+    *type = DA_TYPE_BOOLEAN;
+    return DA_OK;
+}
+
+da_status_t
+da_getpropinteger(const da_deviceinfo_t *info, da_propid_t property, long *vp)
+{
+     *vp = -1;
+    return DA_OK;
+}
+
+da_status_t
+da_getpropstring(const da_deviceinfo_t *info, da_propid_t property, const char **vp)
+{
+    *vp = NULL;
+    return DA_OK;
+}
+
+da_status_t
+da_getpropboolean(const da_deviceinfo_t *info, da_propid_t property, bool *vp)
+{
+    *vp = true;
+    return DA_OK;
+}
+
+const char *
+da_get_property_name(const da_atlas_t *atlas, da_propid_t property)
+{
+    return "isRobot";
+}
diff --git a/addons/deviceatlas/dummy/dac.h b/addons/deviceatlas/dummy/dac.h
new file mode 100644
index 0000000..92a9396
--- /dev/null
+++ b/addons/deviceatlas/dummy/dac.h
@@ -0,0 +1,589 @@
+#ifndef MOBI_DA_DAC_H
+#define MOBI_DA_DAC_H
+
+/**
+ * @file dac.h
+ * @author Afilias Technologies
+ *
+ * @brief API main header file
+ */
+
+#include <sys/types.h>
+#include <limits.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+#ifndef __cplusplus
+#ifndef true
+#ifdef HAVE_NO_BUILTIN__BOOL
+typedef int _Bool;
+#endif
+#define bool _Bool
+
+#define true   1
+#define false  0
+#endif
+#endif
+
+#define MOBI_DA_MAJOR 2
+#define MOBI_DA_MINOR 1
+#define MOBI_DA_DUMMY_LIBRARY 1
+
+
+/**
+ * @brief All values returned by the API have one of these types.
+ * da_getprop*() return data in the appropriate C type for the given da_type.
+ */
+enum da_type {
+    DA_TYPE_NONE,
+    DA_TYPE_BOOLEAN,
+    DA_TYPE_INTEGER,
+    DA_TYPE_NUMBER,
+    DA_TYPE_STRING,
+    DA_TYPE_ARRAY,
+    DA_TYPE_OBJECT,
+    DA_TYPE_NULL
+};
+
+/**
+ * Any method that returns a da_status may potentially fail for one of these reasons.
+ * XXX: Error reporting needs to be improved.
+ */
+enum da_status {
+    DA_OK,              /* Success. */
+    DA_INVALID_JSON,    /* The JSON format is invalid, or the content is unexpected in a given context. */
+    DA_OVERFLOW,        /* Overflow occurred. Note this is used to indicate an unfinished string parse in JSON */
+    DA_FORMAT_ERROR,    /* The data supplied is formatted incorrectly. */
+    DA_NOMEM,           /* There was not enough space to complete the operation */
+    DA_SYS,             /* A system error occurred - consult the OS for more details (eg, check errno) */
+    DA_NOTIMPL,         /* This method is not implemented */
+    DA_NOTFOUND,        /* The requested item was not found. */
+    DA_REGEXBAD,        /* An invalid regex was provided. */
+    DA_NOMORE,          /* Used to indicate the end of an iterator. */
+    DA_INVALID_COOKIE,  /* Cookie value supplied was invalid */
+    DA_INVALID_TYPE,    /* A value of an unexpected type was found. */
+    DA_INTERNAL_ERROR,
+    DA_STATUS_LAST      /* Placeholder to indicate highest possible error value. (value will change as API matures) */
+};
+
+enum da_severity {
+    DA_SEV_FATAL, /* The operation will not continue, and the operation will return an error. */
+    DA_SEV_ERROR, /* An error occurred, but the API call will return at least some valid information */
+    DA_SEV_WARN,  /* An unexpected event occurred, but the system dealt with it */
+    DA_SEV_INFO   /* An informational message. */
+};
+/* Forward references to tagged types */
+struct atlas_image;
+struct da_atlas;
+struct da_deviceinfo;
+struct da_jsonparser;
+struct da_node;
+struct da_propset;
+union da_value;
+struct da_evidence;
+struct da_bitset;
+struct da_allocator;
+struct da_config;
+
+/**
+ * @brief Primary types of the interface.
+ * Primary types used by API client.
+ * Non-typedef structures and unions are considered private to the API.
+ *
+ */
+typedef enum da_severity da_severity_t; /* A severity for the error callback. */
+typedef enum da_status da_status_t; /* An error code - returned from most API calls. */
+typedef da_status_t (*da_setpos_fn)(void *ctx, off_t off); /* callback provided to API to rewind input stream */
+typedef enum da_type da_type_t; /* A value type (integer, string, etc) */
+
+/**
+ * @brief An operation on an atlas involves converting a set of evidence strings into a set of property/value pairs.
+ * The ID for a particular type of evidence is extract from the atlas (eg, for a specific HTTP header, use:
+ *
+ * da_evidence_id_t evidence = da_atlas_header_evidence_id(atlas, "User-Agent");
+ *
+ */
+typedef int da_evidence_id_t;
+
+/**
+ * @brief The search result encompasses a key/value set. Keys are handles retrieved via
+ * _either_ da_atlas_getpropid() or da_getpropid().
+ * Some search results may have keys not available when the atlas is opened (eg,
+ * when the name of the property itself is contained within the evidence)
+ * Such properties by necessity are given a "local" da_propid_t
+ *
+ * You can ensure any properties you are interested in get a global propid by
+ * passing a list of interesting named properties to da_atlas_open()
+ */
+typedef int da_propid_t;
+typedef size_t (*da_read_fn)(void *ctx, size_t maxlen, char *ptr);
+typedef struct da_atlas da_atlas_t;
+typedef struct da_deviceinfo da_deviceinfo_t;
+typedef struct da_evidence da_evidence_t;
+typedef struct da_jsonparser da_jsonparser_t;
+typedef struct da_node da_node_t;
+typedef struct da_property_decl da_property_decl_t;
+typedef struct da_propset da_propset_t;
+typedef struct da_config da_config_t;
+typedef void *(*da_alloc_fn)(void *ctx, size_t);
+typedef void (*da_free_fn)(void *ctx, void *);
+typedef void *(*da_realloc_fn)(void *ctx, void *, size_t);
+typedef void (*da_errorfunc_t)(da_severity_t severity, da_status_t status, const char *msg, va_list args);
+
+
+/* Manifest constants. */
+enum {
+    /*
+     * used as the initial guess for the compiled size of an atlas.
+     * If atlas sizes grow more beyond this, it can be expanded to avoid multiple scans of the data.
+     */
+    DA_INITIAL_MEMORY_ESTIMATE = 1024 * 1024 * 14
+};
+
+struct da_config {
+    unsigned int ua_props;
+    unsigned int lang_props;
+    unsigned int __reserved[14]; /* enough reserved keywords for future use */
+};
+
+/**
+ * Functional interface.
+ */
+
+/**
+ * @brief Initialize process to use the DA API.
+ */
+void da_init(void);
+
+
+/**
+ * @brief Release all resources used by the API
+ */
+void da_fini(void);
+
+/**
+ * @brief User-supplied callback to be invoked with information about an error.
+ * Note this may use thread-local storage etc to store the info on return from the current call
+ * It is guaranteed that an error-reporting function returning an error-code will have called
+ * this function at least once.
+ * @param callback function
+ */
+void da_seterrorfunc(da_errorfunc_t callback);
+
+/**
+ * @brief Given a specific HTTP header, return the associated ID for that header.
+ * When passing evidence to the API, its type is identified using its da_evidince_id_t.
+ * @param atlas atlas instance
+ * @param header_name Header's name
+ * @return evidence id
+ */
+da_evidence_id_t da_atlas_header_evidence_id(const da_atlas_t *atlas, const char *header_name);
+/**
+ * @brief Return the associated ID of the client side properties evidence
+ * @param atlas Atlas instance
+ * @return evidence id
+ */
+da_evidence_id_t da_atlas_clientprop_evidence_id(const da_atlas_t *atlas);
+/**
+ * @brief Return the associated ID of the accept language header evidence
+ * @param atlas Atlas instance
+ * @return evidence id
+ */
+da_evidence_id_t da_atlas_accept_language_evidence_id(const da_atlas_t *atlas);
+
+/**
+ * @brief readfn should present JSON content from ctx.
+ * atlasp points to an uninitialized da_atlas structure.
+ * Result is a compiled atlas at atlasp.
+ * Result is allocated via normal memory-allocation methods, malloc/calloc/realloc, so should be
+ * Free'd with free()
+ * XXX TODO: Change this to take a da_allocator
+ * @param ctx pointer given to read the json file
+ * @param readfn function pointer, set accordingly to the attended given pointer
+ * @param setposfn function pointer
+ * @param ptr Pointer dynamically allocated if the json parsing happened normally
+ * @param len size of the atlas image
+ * @return status of atlas compilation
+ */
+da_status_t da_atlas_compile(void *ctx, da_read_fn readfn, da_setpos_fn setposfn, void **ptr, size_t *len);
+
+/**
+ * @brief opens a previously compiled atlas for operations. extra_props will be available in calls to
+ * da_getpropid on the atlas, and if generated by the search, the ID will be consistent across
+ * different calls to search.
+ * Properties added by a search that are neither in the compiled atlas, nor in the extra_props list
+ * Are assigned an ID within the context that is not transferrable through different search results
+ * within the same atlas.
+ * @param atlas Atlas instance
+ * @param extra_props properties
+ * @param ptr given pointer from previously compiled atlas
+ * @param pos atlas image size
+ * @return status of atlas data opening
+ */
+da_status_t da_atlas_open(da_atlas_t *atlas, da_property_decl_t *extra_props, const void *ptr, size_t pos);
+
+/**
+ * @brief Release any resources associated with the atlas structure atlas, which was previously generated from
+ * da_read_atlas or da_compile_atlas.
+ * @param atlas instance
+ */
+void da_atlas_close(da_atlas_t *atlas);
+
+/**
+ * @brief Find device properties given a set of evidence.
+ * Search results are returned in da_deviceinfo_t, and must be cleaned using da_close
+ * "Evidence" is an array of length count, of string data tagged with an evidence ID.
+ * @param atlas Atlas instance
+ * @param info Device info
+ * @param ev Array of evidences
+ * @param count Number of evidence given
+ * @return status of the search
+ */
+da_status_t da_searchv(const da_atlas_t *atlas, da_deviceinfo_t *info, da_evidence_t *ev, size_t count);
+
+/**
+ * @brief As da_search, but unrolls the evidence array into variable arguments for simpler calling
+ * convention with known evidence types.
+ * varargs are pairs of (da_evidence_id, string), terminated with da_evidence_id DA_END
+ * @code da_search(&myAtlas, &deviceInfo, da_get_header_evidence_id("User-Agent"),
+ * "Mozilla/5.0 (Linux...", DA_END);
+ * @endcode
+ * @param atlas Atlas instance
+ * @param info given device info which holds on device properties
+ * @param pairs of evidence id / evidence value
+ * @return status of the search
+ */
+da_status_t da_search(const da_atlas_t *atlas, da_deviceinfo_t *info, ...);
+
+/**
+ * @brief After finishing with a search result, release resources associated with it.
+ * @param info Device info previously allocated by search functions
+ */
+void da_close(da_deviceinfo_t *info);
+
+/**
+ * @brief Given a property name (Eg, "displayWidth"), return the property ID associated with it for the
+ * specified atlas.
+ * @param atlas Atlas instance
+ * @param propname Property name
+ * @param propid Property id
+ * @return status of the property id search
+ */
+da_status_t da_atlas_getpropid(const da_atlas_t *atlas, const char *propname, da_propid_t *propid);
+
+/**
+ * @brief Given a property ID, return the type of that property.
+ * @code
+ *   da_getproptype(&myAtlas, da_getpropid(&myAtlas, "displayWidth"), &propertyType);
+ *   assert(propertyType == DA_TYPE_INT);
+ * @endcode
+ * @param atlas Atlas instance
+ * @param propid Property id
+ * @param type Type id of the property
+ * @return status of the type id search
+ */
+da_status_t da_atlas_getproptype(const da_atlas_t *atlas, da_propid_t propid, da_type_t *type);
+
+/**
+ * @brief Given a property ID, return the name of that property.
+ * @code
+ *   da_atlas_getpropname(&myAtlas, da_getpropid(&myAtlas, "displayWidth"), &propertyName);
+ *   assert(strcmp("displayWidth", propertyName) == 0);
+ * @endcode
+ * @param atlas Atlas instance
+ * @param propid property id
+ * @param propname property name returned
+ * @return status of the property name search
+ */
+da_status_t da_atlas_getpropname(const da_atlas_t *atlas, da_propid_t propid, const char **propname);
+
+
+/**
+ * @brief Given an atlas instance, return its counters + the builtins
+ * @code
+ *   da_atlas_getpropcount(&myAtlas);
+ * @endcode
+ * @param atlas Atlas instance
+ * @return counters
+ */
+size_t da_atlas_getpropcount(const da_atlas_t *atlas);
+
+/**
+ * @brief Given an atlas instance, set the detection config
+ * @param atlas Atlas instance
+ * @param config instance
+ */
+void da_atlas_setconfig(da_atlas_t *atlas, da_config_t *config);
+
+/**
+ * @brief Given a search result, find the value of a specific property.
+ * @code
+ *   long displayWidth; // width of display in pixels.
+ *   da_getpropinteger(&deviceInfo, da_getpropid(&myAtlas, "displayWidth"), &displayWidth);
+ * @endcode
+ * String contents are owned by the search result, and are valid until the search is closed.
+ */
+/**
+ * @brief returns a property value as a string from a given string typed property id
+ * @param info Device info
+ * @param propid Property id
+ * @param value Value of the property
+ * @return status of property value search
+ */
+da_status_t da_getpropstring(const da_deviceinfo_t *info, da_propid_t propid, const char **value);
+/**
+ * @brief returns a property value as a long from a given long typed property id
+ * @param info Device info
+ * @param propid Property id
+ * @param value Value of the property
+ * @return status of property value search
+ */
+da_status_t da_getpropinteger(const da_deviceinfo_t *info, da_propid_t propid, long *value);
+/**
+ * @brief returns a property value as a boolean from a given boolean typed property id
+ * @param info Device info
+ * @param propid Property id
+ * @param value Value of the property
+ * @return status of property value search
+ */
+da_status_t da_getpropboolean(const da_deviceinfo_t *info, da_propid_t propid, bool *value);
+/**
+ * @brief returns a property value as a float from a given float typed property id
+ * @param info Device info
+ * @param propid Property id
+ * @param value Value of the property
+ * @return status of property value search
+ */
+da_status_t da_getpropfloat(const da_deviceinfo_t *info, da_propid_t propid, double *value);
+
+/**
+ * @brief Some properties may not be not known to the atlas before the search commences.
+ * Such properties cannot have a da_propid_t assigned to them on the atlas, but will
+ * have a local property assigned during search. The name and type of such properties
+ * can be discovered here.
+ *
+ * Properties that are used in the atlas source and properties specifically registered
+ * with da_atlas_open() will always be assigned to a property discovered during search.
+ * Therefore, if there are specific properties that you want to use, and are unsure
+ * if they are in your device atlas source, registering them with da_atlas_open will
+ * make access to them easier and more efficient
+ */
+/**
+ * @brief returns the type of a given device property from the search functions
+ * @param info Device info
+ * @param propid Property id
+ * @param type Type id
+ * @return status of property type search
+ */
+da_status_t da_getproptype(const da_deviceinfo_t *info, da_propid_t propid, da_type_t *type);
+/**
+ * @brief returns the name of a given device property from the search functions
+ * @param info Device info
+ * @param propid Property id
+ * @param propname Property name
+ * @return status of property type search
+ */
+da_status_t da_getpropname(const da_deviceinfo_t *info, da_propid_t propid, const char **propname);
+
+/**
+ * @brief da_getfirstprop/da_getnextprop provide iteration over all properties
+ * in a search result.
+ * Both will return DA_OK if there is a result available, and DA_NOMORE
+ * if the search is complete.
+ * @code
+ *
+ * da_propid_t *propidp;
+ * for (da_status_t status = da_getfirstprop(&result, &propidp);
+ *          status == DA_OK;
+ *          status = da_getnextprop(&result, &propidp)) {
+ *     const char *propname;
+ *     if (da_getpropname(&result, *propidp, &propname) == DA_OK)
+ *         fprintf("found property %s\n", propname);
+ * }
+ * @endcode
+ */
+
+/**
+ * @brief returns the first property from device info
+ * @param info Device info
+ * @param propid Property
+ * @return status
+ */
+da_status_t da_getfirstprop(const da_deviceinfo_t *info, da_propid_t **propid);
+/**
+ * @brief device info properties iterator
+ * @param info Device info
+ * @param propid Property
+ * @return status
+ */
+da_status_t da_getnextprop(const da_deviceinfo_t *info, da_propid_t **propid);
+
+/**
+ * @brief Report an error, as per a report from the API to the user-callback.
+ * @param severity Severity level of the error
+ * @param fmt format error message
+ * @param va_list
+ * @return status
+ */
+da_status_t da_reporterror(da_status_t severity, const char *fmt, ...);
+
+/**
+ * @brief returns a textual description of the type "type".
+ * @param type Type id
+ * @return type name
+ */
+const char *da_typename(da_type_t type);
+
+/**
+ * @brief returns the version from the JSON in memory
+ * @param atlas
+ * @return version
+ */
+char *da_getdataversion(da_atlas_t *atlas);
+
+/**
+ * @brief returns the date creation's timestamp from the JSON in memory
+ * @param atlas
+ * @return version
+ */
+time_t da_getdatacreation(da_atlas_t *atlas);
+
+/**
+ * @brief returns the revision's number from the JSON in memory
+ * @param atlas
+ * @return version
+ */
+int da_getdatarevision(da_atlas_t *atlas);
+
+/**
+ * @brief returns the name of a global property
+ * @param atlas Atlas instance
+ * @param propid Property id
+ * @return property name
+ */
+const char *da_get_property_name(const da_atlas_t *atlas, da_propid_t propid);
+
+/**
+ * @brief returns the number of properties in a result.
+ * @param info Device info
+ * @return properties count
+ */
+size_t da_getpropcount(const da_deviceinfo_t *info);
+
+/*
+ * Details below should not be required for usage of the API
+ */
+
+/**
+ * @brief Represents a usable device atlas interface.
+ *
+ * No user servicable parts inside: access should
+ * be via the functional API.
+ */
+struct da_atlas {
+    const struct atlas_image *image;
+    struct header_evidence_entry *header_priorities;
+    size_t header_evidence_count;
+
+    struct pcre_regex_info *uar_regexes;
+    size_t uar_regex_count;
+
+    struct pcre_regex_info *replacement_regexes;
+    size_t replacement_regex_count;
+
+    da_evidence_id_t user_agent_evidence;
+    da_evidence_id_t clientprops_evidence;
+    da_evidence_id_t accept_language_evidence;
+    da_evidence_id_t next_evidence;
+
+    da_propset_t *properties;
+    da_propid_t id_propid;
+    da_propid_t id_proplang;
+    da_propid_t id_proplang_locale;
+
+    da_config_t config;
+
+    da_deviceinfo_t **cpr_props;
+    size_t cpr_count;
+};
+
+/* fixed constants. */
+enum {
+    DA_BUFSIZE = 16000
+};
+
+/**
+ * Represents a chunk of memory. See comments on da_deviceinfo.
+ * This is presented here to allow aggregation in da_deviceinfo:
+ * Not for public consumption.
+ */
+struct da_buf {
+    struct da_buf *next;
+    char *cur;
+    char *limit;
+    char buf[DA_BUFSIZE];
+};
+
+/**
+ * A callback interface for allocating memory from some source
+ * Not for public consumption.
+ */
+struct da_allocator {
+    da_alloc_fn alloc;
+    da_free_fn free;
+    da_realloc_fn realloc;
+    void *context;
+};
+
+
+/**
+ * Represents a search result
+ * Can be used to retrieve values of known properties discovered from the evidence,
+ * iterate over the properties with known values, and query property types that are
+ * local to this result.
+ *
+ * The atlas the search is carried out on must survive any da_deviceinfo results
+ * it provides.
+ */
+struct da_deviceinfo {
+    struct da_allocator allocator;
+    const da_atlas_t *atlas;   /* reference to the atlas the search was carried out on. */
+    struct da_bitset *present; /* property received from tree */
+    struct da_bitset *localprop; /* property was received from UAR rule or CPR */
+    struct da_bitset *cprprop;  /* property was received from CPR */
+    union da_value *properties; /* properties - indexed by property id. */
+    da_propid_t *proplist; /* list of properties present in this result. */
+    size_t propcount; /* size of proplist */
+    da_propset_t *local_types; /* property descriptors local to this search result. */
+
+    /**
+     * The per-deviceinfo heap is stored here. Allocations for data in the result
+     * come from the raw data in these buffers. The size of the fixed-size buffer
+     * built in to da_buf is sized such that all known search results will not
+     * require memory allocation via malloc()
+     */
+    struct da_buf *heap;
+    struct da_buf initial_heap;
+};
+
+/**
+ * Used to pass evidence to da_searchv()
+ */
+struct da_evidence {
+    da_evidence_id_t key;
+    char *value;
+};
+
+/**
+ * Used to pass properties the API intends to query to the da_atlas_open function
+ * This can be used to improve performance of lookup on properties well-known
+ * to the API user, but not present in the JSON database.
+ */
+struct da_property_decl {
+    const char *name;
+    da_type_t type;
+};
+
+
+#endif /* DEVATLAS_DAC_H */
diff --git a/addons/deviceatlas/dummy/json.c b/addons/deviceatlas/dummy/json.c
new file mode 100644
index 0000000..53c5fdf
--- /dev/null
+++ b/addons/deviceatlas/dummy/json.c
@@ -0,0 +1 @@
+#include <stdio.h>