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annotate libs/imago2/file_ppm.c @ 33:33e9eedad390

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ah.. blunder
author John Tsiombikas <nuclear@mutantstargoat.com>
date Fri, 09 Sep 2011 00:03:37 +0300
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nuclear@26 1 /*
nuclear@26 2 libimago - a multi-format image file input/output library.
nuclear@26 3 Copyright (C) 2010 John Tsiombikas <nuclear@member.fsf.org>
nuclear@26 4
nuclear@26 5 This program is free software: you can redistribute it and/or modify
nuclear@26 6 it under the terms of the GNU Lesser General Public License as published
nuclear@26 7 by the Free Software Foundation, either version 3 of the License, or
nuclear@26 8 (at your option) any later version.
nuclear@26 9
nuclear@26 10 This program is distributed in the hope that it will be useful,
nuclear@26 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@26 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@26 13 GNU Lesser General Public License for more details.
nuclear@26 14
nuclear@26 15 You should have received a copy of the GNU Lesser General Public License
nuclear@26 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@26 17 */
nuclear@26 18
nuclear@26 19 /* -- Portable Pixmap (PPM) module -- */
nuclear@26 20
nuclear@26 21 #include <string.h>
nuclear@26 22 #include "imago2.h"
nuclear@26 23 #include "ftype_module.h"
nuclear@26 24
nuclear@26 25 static int check(struct img_io *io);
nuclear@26 26 static int read(struct img_pixmap *img, struct img_io *io);
nuclear@26 27 static int write(struct img_pixmap *img, struct img_io *io);
nuclear@26 28
nuclear@26 29 int img_register_ppm(void)
nuclear@26 30 {
nuclear@26 31 static struct ftype_module mod = {".ppm", check, read, write};
nuclear@26 32 return img_register_module(&mod);
nuclear@26 33 }
nuclear@26 34
nuclear@26 35
nuclear@26 36 static int check(struct img_io *io)
nuclear@26 37 {
nuclear@26 38 char id[2];
nuclear@26 39 int res = -1;
nuclear@26 40 long pos = io->seek(0, SEEK_CUR, io->uptr);
nuclear@26 41
nuclear@26 42 if(io->read(id, 2, io->uptr) < 2) {
nuclear@26 43 io->seek(pos, SEEK_SET, io->uptr);
nuclear@26 44 return -1;
nuclear@26 45 }
nuclear@26 46
nuclear@26 47 if(id[0] == 'P' && (id[1] == '6' || id[1] == '3')) {
nuclear@26 48 res = 0;
nuclear@26 49 }
nuclear@26 50 io->seek(pos, SEEK_SET, io->uptr);
nuclear@26 51 return res;
nuclear@26 52 }
nuclear@26 53
nuclear@26 54 static int iofgetc(struct img_io *io)
nuclear@26 55 {
nuclear@26 56 char c;
nuclear@26 57 return io->read(&c, 1, io->uptr) < 1 ? -1 : c;
nuclear@26 58 }
nuclear@26 59
nuclear@26 60 static char *iofgets(char *buf, int size, struct img_io *io)
nuclear@26 61 {
nuclear@26 62 int c;
nuclear@26 63 char *ptr = buf;
nuclear@26 64
nuclear@26 65 while(--size > 0 && (c = iofgetc(io)) != -1) {
nuclear@26 66 *ptr++ = c;
nuclear@26 67 if(c == '\n') break;
nuclear@26 68 }
nuclear@26 69 *ptr = 0;
nuclear@26 70
nuclear@26 71 return ptr == buf ? 0 : buf;
nuclear@26 72 }
nuclear@26 73
nuclear@26 74 /* TODO: implement P3 reading */
nuclear@26 75 static int read(struct img_pixmap *img, struct img_io *io)
nuclear@26 76 {
nuclear@26 77 char buf[256];
nuclear@26 78 int xsz, ysz, maxval, got_hdrlines = 1;
nuclear@26 79
nuclear@26 80 if(!iofgets(buf, sizeof buf, io)) {
nuclear@26 81 return -1;
nuclear@26 82 }
nuclear@26 83 if(!(buf[0] == 'P' && (buf[1] == '6' || buf[1] == '3'))) {
nuclear@26 84 return -1;
nuclear@26 85 }
nuclear@26 86
nuclear@26 87 while(got_hdrlines < 3 && iofgets(buf, sizeof buf, io)) {
nuclear@26 88 if(buf[0] == '#') continue;
nuclear@26 89
nuclear@26 90 switch(got_hdrlines) {
nuclear@26 91 case 1:
nuclear@26 92 if(sscanf(buf, "%d %d\n", &xsz, &ysz) < 2) {
nuclear@26 93 return -1;
nuclear@26 94 }
nuclear@26 95 break;
nuclear@26 96
nuclear@26 97 case 2:
nuclear@26 98 if(sscanf(buf, "%d\n", &maxval) < 1) {
nuclear@26 99 return -1;
nuclear@26 100 }
nuclear@26 101 default:
nuclear@26 102 break;
nuclear@26 103 }
nuclear@26 104 got_hdrlines++;
nuclear@26 105 }
nuclear@26 106
nuclear@26 107 if(xsz < 1 || ysz < 1 || maxval != 255) {
nuclear@26 108 return -1;
nuclear@26 109 }
nuclear@26 110
nuclear@26 111 if(img_set_pixels(img, xsz, ysz, IMG_FMT_RGB24, 0) == -1) {
nuclear@26 112 return -1;
nuclear@26 113 }
nuclear@26 114
nuclear@26 115 if(io->read(img->pixels, xsz * ysz * 3, io->uptr) < xsz * ysz * 3) {
nuclear@26 116 return -1;
nuclear@26 117 }
nuclear@26 118 return 0;
nuclear@26 119 }
nuclear@26 120
nuclear@26 121 static int write(struct img_pixmap *img, struct img_io *io)
nuclear@26 122 {
nuclear@26 123 int sz;
nuclear@26 124 char buf[256];
nuclear@26 125 struct img_pixmap tmpimg;
nuclear@26 126
nuclear@26 127 img_init(&tmpimg);
nuclear@26 128
nuclear@26 129 if(img->fmt != IMG_FMT_RGB24) {
nuclear@26 130 if(img_copy(&tmpimg, img) == -1) {
nuclear@26 131 return -1;
nuclear@26 132 }
nuclear@26 133 if(img_convert(&tmpimg, IMG_FMT_RGB24) == -1) {
nuclear@26 134 return -1;
nuclear@26 135 }
nuclear@26 136 img = &tmpimg;
nuclear@26 137 }
nuclear@26 138
nuclear@26 139 sprintf(buf, "P6\n#written by libimago2\n%d %d\n255\n", img->width, img->height);
nuclear@26 140 if(io->write(buf, strlen(buf), io->uptr) < strlen(buf)) {
nuclear@26 141 img_destroy(&tmpimg);
nuclear@26 142 return -1;
nuclear@26 143 }
nuclear@26 144
nuclear@26 145 sz = img->width * img->height * 3;
nuclear@26 146 if(io->write(img->pixels, sz, io->uptr) < sz) {
nuclear@26 147 img_destroy(&tmpimg);
nuclear@26 148 return -1;
nuclear@26 149 }
nuclear@26 150
nuclear@26 151 img_destroy(&tmpimg);
nuclear@26 152 return 0;
nuclear@26 153 }