[hackers] [farbfeld] Convert depth-check to switch and remove unused variables || FRIGN

[git]

commit 06c4b47d0102d2e2205c983c2158b4121c7293ab
Author:     FRIGN <d...@frign.de>
AuthorDate: Mon Jan 4 18:33:42 2016 +0100
Commit:     FRIGN <d...@frign.de>
CommitDate: Mon Jan 4 18:33:42 2016 +0100

    Convert depth-check to switch and remove unused variables

diff --git a/png2ff.c b/png2ff.c
index 5b75dfa..101036d 100644
--- a/png2ff.c
+++ b/png2ff.c
@@ -13,7 +13,7 @@ main(int argc, char *argv[])
        png_structp png_struct_p;
        png_infop png_info_p;
        png_bytepp png_row_p;
-       int depth, color, interlace;
+       int depth;
        uint32_t width, height, png_row_len, tmp32, r, i;
        uint16_t tmp16;
 
@@ -43,7 +43,7 @@ main(int argc, char *argv[])
        png_read_png(png_struct_p, png_info_p, PNG_TRANSFORM_PACKING |
                     PNG_TRANSFORM_EXPAND, NULL);
        png_get_IHDR(png_struct_p, png_info_p, &width, &height, &depth,
-                    &color, &interlace, NULL, NULL);
+                    NULL, NULL, NULL, NULL);
        png_row_len = png_get_rowbytes(png_struct_p, png_info_p);
        png_row_p = png_get_rows(png_struct_p, png_info_p);
 
@@ -55,7 +55,8 @@ main(int argc, char *argv[])
        fwrite(&tmp32, sizeof(uint32_t), 1, stdout);
 
        /* write data */
-       if (depth == 8) {
+       switch(depth) {
+       case 8:
                for (r = 0; r < height; ++r) {
                        for (i = 0; i < png_row_len; i++) {
                                /* ((2^16-1) / 255) == 257 */
@@ -63,7 +64,8 @@ main(int argc, char *argv[])
                                fwrite(&tmp16, sizeof(uint16_t), 1, stdout);
                        }
                }
-       } else if (depth == 16) {
+               break;
+       case 16:
                for (r = 0; r < height; ++r) {
                        for (i = 0; i < png_row_len / 2; i++) {
                                tmp16 = *((uint16_t *)
@@ -71,7 +73,8 @@ main(int argc, char *argv[])
                                fwrite(&tmp16, sizeof(uint16_t), 1, stdout);
                        }
                }
-       } else {
+               break;
+       default:
                fprintf(stderr, "format error\n");
                return 1;
        }