PNM: Added pnm-ascii special property

FORMATS.md

@@ -245,7 +245,10 @@
         <b>Indexed:</b> 1-bit, 8-bit.
         <b>RGB:</b> 24-bit, 48-bit.
         <br/><br/>
-        <b>Content:</b> Static.
+        <b>Content:</b> Static, Meta data.
+        <br/><br/>
+        <b>Special properties:</b> Key: <i>"pnm-ascii"</i>. Description: True if the image pixels are encoded in ASCII mode.
+        Possible values: bool.
     </td>
     <td>-</td>
     <td>Unsupported</td>

src/sail-codecs/pnm/helpers.c

@@ -167,3 +167,26 @@ enum SailPixelFormat pnm_private_rgb_sail_pixel_format(enum SailPnmVersion pnm_v
     }
 }
 
+sail_status_t pnm_private_store_ascii(enum SailPnmVersion pnm_version, struct sail_hash_map *special_properties) {
+
+    struct sail_variant *variant;
+    SAIL_TRY(sail_alloc_variant(&variant));
+
+    switch (pnm_version) {
+        case SAIL_PNM_VERSION_P1:
+        case SAIL_PNM_VERSION_P2:
+        case SAIL_PNM_VERSION_P3: {
+            sail_set_variant_bool(variant, true);
+        }
+
+        default: {
+            sail_set_variant_bool(variant, false);
+        }
+    }
+
+    sail_put_hash_map(special_properties, "pnm-ascii", variant);
+
+    sail_destroy_variant(variant);
+
+    return SAIL_OK;
+}

src/sail-codecs/pnm/helpers.h

@@ -56,4 +56,6 @@ SAIL_HIDDEN sail_status_t pnm_private_read_pixels(struct sail_io *io, struct sai
 
 SAIL_HIDDEN enum SailPixelFormat pnm_private_rgb_sail_pixel_format(enum SailPnmVersion pnm_version, unsigned bpc);
 
+SAIL_HIDDEN sail_status_t pnm_private_store_ascii(enum SailPnmVersion pnm_version, struct sail_hash_map *special_properties);
+
 #endif

src/sail-codecs/pnm/pnm.c

@@ -207,6 +207,14 @@ SAIL_EXPORT sail_status_t sail_codec_load_seek_next_frame_v8_pnm(void *state, st
 
         image_local->source_image->pixel_format = pixel_format;
         image_local->source_image->compression  = SAIL_COMPRESSION_NONE;
+
+        if (pnm_state->load_options->options & SAIL_OPTION_META_DATA) {
+            SAIL_TRY_OR_CLEANUP(sail_alloc_hash_map(&image_local->source_image->special_properties),
+                                /* cleanup */ sail_destroy_image(image_local));
+            SAIL_TRY_OR_CLEANUP(pnm_private_store_ascii(pnm_state->version,
+                                                        image_local->source_image->special_properties),
+                                /* cleanup */ sail_destroy_image(image_local));
+        }
     }
 
     image_local->width          = w;

src/sail-codecs/pnm/pnm.codec.info.in

@@ -11,7 +11,7 @@ extensions=pbm;pgm;ppm;pnm
 mime-types=image/x-portable-bitmap;image/x-portable-graymap;image/x-portable-pixmap;image/x-portable-anymap
 
 [load-features]
-features=STATIC;SOURCE-IMAGE
+features=STATIC;META-DATA;SOURCE-IMAGE
 tuning=
 
 [save-features]