generalize compression interface

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@67971 15284696-431f-4ddb-bdfa-cd5b030d7da7

include/defs/gis.h

@@ -164,6 +164,58 @@ int G_num_standard_colors(void);
 int G_insert_commas(char *);
 void G_remove_commas(char *);
 
+/* compress.c */
+int G_compressor_number(char *);
+char *G_compressor_name(int);
+int G_check_compressor(int);
+int G_write_compressed(int, unsigned char *, int, int);
+int G_write_unompressed(int, unsigned char *, int);
+int G_read_compressed(int, int, unsigned char *, int, int);
+int G_compress(unsigned char *, int, unsigned char *, int, int);
+int G_expand(unsigned char *, int, unsigned char *, int, int);
+
+/* compress.c : no compression */
+int
+G_no_compress(unsigned char *src, int src_sz, unsigned char *dst,
+		int dst_sz);
+int
+G_no_expand(unsigned char *src, int src_sz, unsigned char *dst,
+	      int dst_sz);
+
+/* cmprrle.c : Run Length Encoding (RLE) */
+int
+G_rle_compress(unsigned char *src, int src_sz, unsigned char *dst,
+		int dst_sz);
+int
+G_rle_expand(unsigned char *src, int src_sz, unsigned char *dst,
+	      int dst_sz);
+
+/* cmprzlib.c : ZLIB's DEFLATE */
+int
+G_zlib_compress(unsigned char *src, int src_sz, unsigned char *dst,
+		int dst_sz);
+int
+G_zlib_expand(unsigned char *src, int src_sz, unsigned char *dst,
+	      int dst_sz);
+
+/* cmprlz4.c : LZ4, extremely fast */
+int
+G_lz4_compress(unsigned char *src, int src_sz, unsigned char *dst,
+		int dst_sz);
+int
+G_lz4_expand(unsigned char *src, int src_sz, unsigned char *dst,
+	      int dst_sz);
+
+/* cmprbzip.c : BZIP2, high compression, faster than ZLIB's DEFLATE with level 9 */
+int
+G_bz2_compress(unsigned char *src, int src_sz, unsigned char *dst,
+		int dst_sz);
+int
+G_bz2_expand(unsigned char *src, int src_sz, unsigned char *dst,
+	      int dst_sz);
+
+/* add more compression methods here */
+
 /* copy_dir.c */
 int G_recursive_copy(const char *, const char *);
 
@@ -270,16 +322,6 @@ const char *G_find_raster3d(const char *, const char *);
 const char *G_find_vector(char *, const char *);
 const char *G_find_vector2(const char *, const char *);
 
-/* compress.c */
-int G_compressor_number(char *);
-char *G_compressor_name(int);
-int G_check_compressor(int);
-int G_write_compressed(int, unsigned char *, int, int);
-int G_write_unompressed(int, unsigned char *, int);
-int G_read_compressed(int, int, unsigned char *, int, int);
-int G_compress(unsigned char *, int, unsigned char *, int, int);
-int G_expand(unsigned char *, int, unsigned char *, int, int);
-
 /* geodesic.c */
 int G_begin_geodesic_equation(double, double, double, double);
 double G_geodesic_lat_from_lon(double);

lib/gis/compress.h

@@ -16,49 +16,6 @@
  * modify G_compress(), G_expand()
  */
 
-
-/* compress.c : no compression */
-int
-G_no_compress(unsigned char *src, int src_sz, unsigned char *dst,
-		int dst_sz);
-int
-G_no_expand(unsigned char *src, int src_sz, unsigned char *dst,
-	      int dst_sz);
-
-/* cmprrle.c : Run Length Encoding (RLE) */
-int
-G_rle_compress(unsigned char *src, int src_sz, unsigned char *dst,
-		int dst_sz);
-int
-G_rle_expand(unsigned char *src, int src_sz, unsigned char *dst,
-	      int dst_sz);
-
-/* cmprzlib.c : ZLIB's DEFLATE */
-int
-G_zlib_compress(unsigned char *src, int src_sz, unsigned char *dst,
-		int dst_sz);
-int
-G_zlib_expand(unsigned char *src, int src_sz, unsigned char *dst,
-	      int dst_sz);
-
-/* cmprlz4.c : LZ4, extremely fast */
-int
-G_lz4_compress(unsigned char *src, int src_sz, unsigned char *dst,
-		int dst_sz);
-int
-G_lz4_expand(unsigned char *src, int src_sz, unsigned char *dst,
-	      int dst_sz);
-
-/* cmprbzip.c : BZIP2, high compression, faster than ZLIB's DEFLATE with level 9 */
-int
-G_bz2_compress(unsigned char *src, int src_sz, unsigned char *dst,
-		int dst_sz);
-int
-G_bz2_expand(unsigned char *src, int src_sz, unsigned char *dst,
-	      int dst_sz);
-
-/* add more here */
-
 typedef int compress_fn(unsigned char *src, int src_sz, unsigned char *dst,
 		int dst_sz);
 typedef int expand_fn(unsigned char *src, int src_sz, unsigned char *dst,

lib/raster/get_row.c

@@ -844,7 +844,7 @@ static int read_null_bits_compressed(int null_fd, unsigned char *flags,
     }
 
     /* null bits file compressed with LZ4, see lib/gis/compress.h */
-    if (G_expand(compressed_buf, readamount, flags, size, 3) < 1) {
+    if (G_lz4_expand(compressed_buf, readamount, flags, size) < 1) {
 	G_fatal_error(_("Error uncompressing null data for row %d of <%s>"),
 		      row, fcb->name);
     }

lib/raster/put_row.c

@@ -506,7 +506,7 @@ static void write_null_bits_compressed(const unsigned char *flags,
     compressed_buf = G_alloca(size + 1);
 
     /* compress null bits file with LZ4, see lib/gis/compress.h */
-    nwrite = G_compress(flags, size, compressed_buf, size, 3);
+    nwrite = G_lz4_compress(flags, size, compressed_buf, size);
 
     if (nwrite > 0 && nwrite < size) {
 	if (write(fcb->null_fd, compressed_buf, nwrite) != nwrite)