Merge pull request #3 from metworkbot/common_files_force

chore: sync common files from resources repository

README.md

@@ -6,6 +6,102 @@
 [![Drone CI](http://metwork-framework.org:8000/api/badges/metwork-framework/mapserverapi/status.svg)](http://metwork-framework.org:8000/metwork-framework/mapserverapi)
 [![Maintenance](https://github.com/metwork-framework/resources/blob/master/badges/maintained.svg)]()
 
+## What is it ?
+
+This is a tiny C library to invoke [mapserver](http://mapserver.org) engine
+as a library (with no daemon or CGI).
+
+## Build
+
+### Prerequisites
+
+- mapserver installed
+- standard compilation tools (gcc, make...)
+- glib2 library and corresponding headers
+
+### Building
+
+To build the library you must specify:
+
+- `MAPSERVER_LIB_DIR`: the full path of the directory containing `libmapserver.so`
+- `PREFIX`: the full path of the directory where you want to install the library
+
+For example:
+
+```
+make MAPSERVER_LIB_DIR=/opt/mapserver/lib PREFIX=/usr/local clean all install
+```
+
+### Testing
+
+You must have `valgrind` tool installed.
+
+```
+make MAPSERVER_LIB_DIR=/opt/mapserver/lib PREFIX=/usr/local test
+```
+
+## Usage
+
+### Compilation flags
+
+The library use `pkg-config` tool. So you can use the following command to
+get the compilation flags:
+
+```
+pkg-config --cflags --libs mapserverapi
+```
+
+If not found, you may have to add `PREFIX` at the end of `${PKG_CONFIG_PATH}`
+environnement variable.
+
+### In your code
+
+```C
+#include <mapserverapi.h>
+
+// [...]
+
+# Init the library (mandatory)
+mapserverapi_init();
+
+gchar *mapfile_content;
+# [...]
+# Put a mapfile content into mapfile_content string
+
+# Set a WMS query_string (for this example)
+gchar *query_string = "LAYERS=ocean&TRANSPARENT=true&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&EXCEPTIONS=application%2Fvnd.ogc.se_xml&SRS=EPSG%3A4326&BBOX=-180.0,-90.0,180.0,90.0&WIDTH=500&HEIGHT=250"
+
+# Invoke mapserver
+void *body;
+gchar *content_type = NULL;
+gsize body_length;
+gboolean b = mapserverapi_invoke(mapfile_content, query_string, &body, &content_type, &body_length);
+if (b == TRUE) {
+    # you have the full body (PNG image in this example) in body variable (this buffer is managed by the library, don't free it by yourself !)
+    # you have the body length in body_length variable.
+    # you have the content_type of the body in content_type variable (you have to free it after use).
+
+    # [...]
+
+    # free content_type when you have finished with them
+    # (but don't free body variable)
+    g_free(content_type);
+}
+
+# Another way to use the library, invoke mapserver and get the body in a file
+gchar *content_type2 = NULL;
+gboolean
+
+# Destroy the library
+mapserverapi_destroy();
+```
+
+
+### Uninstalling
+
+```
+make MAPSERVER_LIB_DIR=/opt/mapserver/lib PREFIX=/usr/local uninstall
+```
 
 
 ## Contributing guide