Also embed proj.ini if EMBED_RESOURCE_FILES=ON

docs/source/install.rst

@@ -452,16 +452,17 @@ All cached entries can be viewed using ``cmake -LAH`` from a build directory.
 
     Default is OFF for shared library builds (BUILD_SHARED_LIBS=ON), and ON
     for static library builds (BUILD_SHARED_LIBS=OFF).
-    When ON, :file:`proj.db` will be embedded into the PROJ library.
+    When ON, :file:`proj.db` and :file:`proj.ini` will be embedded into the PROJ library.
 
 .. option:: USE_ONLY_EMBEDDED_RESOURCE_FILES=ON/OFF
 
     .. versionadded:: 9.6
 
     Even if EMBED_RESOURCE_FILES=ON, by default PROJ will still try to locate
-    :file:`proj.db` on the file system, and fallback to the embedded version if
-    not found. By setting USE_ONLY_EMBEDDED_RESOURCE_FILES=ON, no attempt
-    at locating :file:`proj.db` on the file system is made. Default is OFF.
+    :file:`proj.db` and :file:`proj.ini` on the file system, and fallback to the
+    embedded version if not found.
+    By setting USE_ONLY_EMBEDDED_RESOURCE_FILES=ON, no attempt at locating
+    those files on the file system is made. Default is OFF.
     Users will also typically want to set EMBED_PROJ_DATA_PATH=OFF if setting
     USE_ONLY_EMBEDDED_RESOURCE_FILES=OFF.
 

src/embedded_resources.c

@@ -8,10 +8,27 @@ const unsigned char *pj_get_embedded_proj_db(unsigned int *pnSize) {
     *pnSize = (unsigned int)sizeof(proj_db);
     return proj_db;
 }
+
+const char *pj_get_embedded_proj_ini(unsigned int *pnSize) {
+    static const char proj_ini[] = {
+#embed PROJ_INI
+    };
+    *pnSize = (unsigned int)sizeof(proj_ini);
+    return proj_ini;
+}
+
 #else
+
 #include "file_embed/proj_db.h"
 const unsigned char *pj_get_embedded_proj_db(unsigned int *pnSize) {
     *pnSize = proj_db_size;
     return proj_db_data;
 }
+
+#include "file_embed/proj_ini.h"
+const char *pj_get_embedded_proj_ini(unsigned int *pnSize) {
+    *pnSize = proj_ini_size;
+    return (const char *)proj_ini_data;
+}
+
 #endif

src/embedded_resources.h

@@ -6,6 +6,7 @@ extern "C" {
 #endif
 
 const unsigned char *pj_get_embedded_proj_db(unsigned int *pnSize);
+const char *pj_get_embedded_proj_ini(unsigned int *pnSize);
 
 #ifdef __cplusplus
 }

src/filemanager.cpp

@@ -69,6 +69,10 @@
 #include <unistd.h>
 #endif
 
+#ifdef EMBED_RESOURCE_FILES
+#include "embedded_resources.h"
+#endif
+
 //! @cond Doxygen_Suppress
 
 using namespace NS_PROJ::internal;
@@ -1850,21 +1854,32 @@ void pj_load_ini(PJ_CONTEXT *ctx) {
     }
 
     ctx->iniFileLoaded = true;
-    auto file = std::unique_ptr<NS_PROJ::File>(
-        reinterpret_cast<NS_PROJ::File *>(pj_open_lib_internal(
-            ctx, "proj.ini", "rb", pj_open_file_with_manager, nullptr, 0)));
-    if (!file)
-        return;
-    file->seek(0, SEEK_END);
-    const auto filesize = file->tell();
-    if (filesize == 0 || filesize > 100 * 1024U)
-        return;
-    file->seek(0, SEEK_SET);
     std::string content;
-    content.resize(static_cast<size_t>(filesize));
-    const auto nread = file->read(&content[0], content.size());
-    if (nread != content.size())
+    std::unique_ptr<NS_PROJ::File> file;
+#ifndef USE_ONLY_EMBEDDED_RESOURCE_FILES
+    file.reset(reinterpret_cast<NS_PROJ::File *>(pj_open_lib_internal(
+        ctx, "proj.ini", "rb", pj_open_file_with_manager, nullptr, 0)));
+#endif
+    if (!file) {
+#ifdef EMBED_RESOURCE_FILES
+        unsigned int content_size = 0;
+        const char *c_content = pj_get_embedded_proj_ini(&content_size);
+        content.assign(c_content, content_size);
+#else
         return;
+#endif
+    }
+    if (file) {
+        file->seek(0, SEEK_END);
+        const auto filesize = file->tell();
+        if (filesize == 0 || filesize > 100 * 1024U)
+            return;
+        file->seek(0, SEEK_SET);
+        content.resize(static_cast<size_t>(filesize));
+        const auto nread = file->read(&content[0], content.size());
+        if (nread != content.size())
+            return;
+    }
     content += '\n';
     size_t pos = 0;
     while (pos != std::string::npos) {

src/lib_proj.cmake

@@ -412,9 +412,21 @@ if (EMBED_RESOURCE_FILES AND NOT IS_SHARP_EMBED_AVAILABLE_RES)
         DEPENDS generate_proj_db "${PROJECT_BINARY_DIR}/data/proj.db"
     )
     target_sources(proj PRIVATE embedded_resources.c "${EMBEDDED_PROJ_DB}")
+
+    set(EMBEDDED_PROJ_INI "file_embed/proj_ini.c")
+    add_custom_command(
+        OUTPUT "${EMBEDDED_PROJ_INI}"
+        COMMAND ${CMAKE_COMMAND}
+        -DRUN_FILE_EMBED_GENERATE=1
+        "-DFILE_EMBED_GENERATE_PATH=${PROJECT_SOURCE_DIR}/data/proj.ini"
+        -P ${PROJECT_SOURCE_DIR}/cmake/FileEmbed.cmake
+        DEPENDS "${PROJECT_SOURCE_DIR}/data/proj.ini"
+    )
+    target_sources(proj PRIVATE embedded_resources.c "${EMBEDDED_PROJ_DB}" "${EMBEDDED_PROJ_INI}")
 elseif(EMBED_RESOURCE_FILES AND IS_SHARP_EMBED_AVAILABLE_RES)
     add_library(proj_resources OBJECT embedded_resources.c)
     target_compile_definitions(proj_resources PRIVATE "PROJ_DB=\"${PROJECT_BINARY_DIR}/data/proj.db\"")
+    target_compile_definitions(proj_resources PRIVATE "PROJ_INI=\"${PROJECT_SOURCE_DIR}/data/proj.ini\"")
     target_compile_definitions(proj_resources PRIVATE USE_SHARP_EMBED)
     add_dependencies(proj_resources generate_proj_db)
     option(PROJ_OBJECT_LIBRARIES_POSITION_INDEPENDENT_CODE "Set ON to produce -fPIC code" ${BUILD_SHARED_LIBS})

test/cli/test_cs2cs_various.yaml

@@ -1372,6 +1372,7 @@ tests:
     PROJ_DATA: $tmpdir
     PROJ_DEBUG: 2
     PROJ_SKIP_READ_USER_WRITABLE_DIRECTORY: YES
+    PROJ_ONLY_BEST_DEFAULT: ""
   args: EPSG:4326+5773 EPSG:4326+5782
   in: 39 -3 0
   grep-v: pj_open_lib