[andy/viking.git] / src / thumbnails.c

/*
 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
 *
 * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

/*
 * Large (and important) sections of this file were adapted from
 * ROX-Filer source code, Copyright (C) 2003, the ROX-Filer team,
 * originally licensed under the GPL v2 or greater (as above).
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#include <string.h>
#include <glib.h>
#include <glib/gstdio.h>
#include "viking.h"
#include "thumbnails.h"
#include "icons/icons.h"

#ifdef __CYGWIN__
#ifdef __CYGWIN_USE_BIG_TYPES__
#define ST_SIZE_FMT "%lld"
#else
#define ST_SIZE_FMT "%ld"
#endif
#else
/* FIXME -- on some systems this may need to me "lld", see ROX-Filer code */
#define ST_SIZE_FMT "%ld"
#endif

#undef MIN /* quit yer whining, gcc */
#undef MAX
#include <sys/param.h> /* for realpath() */
#ifndef MAX
/* We need MAX macro and some system does not offer it */
#define MAX(a,b) (((a)>(b))?(a):(b))
#endif

#define HOME_DIR g_get_home_dir()

#ifdef WINDOWS
#define THUMB_DIR "\\THUMBNAILS\\" /* viking maps default viking\maps */
#define THUMB_SUB_DIR "normal\\"
#define realpath(X,Y) _fullpath(Y,X,MAX_PATH)

#else
#define THUMB_DIR "/.thumbnails/"
#define THUMB_SUB_DIR "normal/"
#endif

#define PIXMAP_THUMB_SIZE  128

#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif

static char *md5_hash(const char *message);
static char *pathdup(const char *path);
static GdkPixbuf *save_thumbnail(const char *pathname, GdkPixbuf *full);
static GdkPixbuf *child_create_thumbnail(const gchar *path);

gboolean a_thumbnails_exists ( const gchar *filename )
{
  GdkPixbuf *pixbuf = a_thumbnails_get(filename);
  if ( pixbuf )
  {
    g_object_unref ( G_OBJECT ( pixbuf ) );
    return TRUE;
  }
  return FALSE;
}

GdkPixbuf *a_thumbnails_get_default ()
{
  return gdk_pixbuf_from_pixdata ( &thumbnails_pixbuf, FALSE, NULL );
}

/* filename must be absolute. you could have a function to make sure it exists and absolutize it */

void a_thumbnails_create(const gchar *filename)
{
  GdkPixbuf *pixbuf = a_thumbnails_get(filename);

  if ( ! pixbuf )
    pixbuf = child_create_thumbnail(filename);
  
  if ( pixbuf )
    g_object_unref (  G_OBJECT ( pixbuf ) );
}

GdkPixbuf *a_thumbnails_scale_pixbuf(GdkPixbuf *src, int max_w, int max_h)
{
	int	w, h;

	w = gdk_pixbuf_get_width(src);
	h = gdk_pixbuf_get_height(src);

	if (w <= max_w && h <= max_h)
	{
		g_object_ref ( G_OBJECT ( src ) );
		return src;
	}
	else
	{
		float scale_x = ((float) w) / max_w;
		float scale_y = ((float) h) / max_h;
		float scale = MAX(scale_x, scale_y);
		int dest_w = w / scale;
		int dest_h = h / scale;
		
		return gdk_pixbuf_scale_simple(src,
						MAX(dest_w, 1),
						MAX(dest_h, 1),
						GDK_INTERP_BILINEAR);
	}
}

static GdkPixbuf *child_create_thumbnail(const gchar *path)
{
	GdkPixbuf *image, *tmpbuf;

	image = gdk_pixbuf_new_from_file(path, NULL);
	if (!image)
	  return NULL;

	tmpbuf = gdk_pixbuf_apply_embedded_orientation(image);
	g_object_unref(G_OBJECT(image));
	image = tmpbuf;

	if (image)
        {
		GdkPixbuf *thumb = save_thumbnail(path, image);
		g_object_unref ( G_OBJECT ( image ) );
		return thumb;
	}

	return NULL;
}

static GdkPixbuf *save_thumbnail(const char *pathname, GdkPixbuf *full)
{
	struct stat info;
	gchar *path;
	int original_width, original_height;
	const gchar* orientation;
	GString *to;
	char *md5, *swidth, *sheight, *ssize, *smtime, *uri;
	mode_t old_mask;
	int name_len;
	GdkPixbuf *thumb;

	if (stat(pathname, &info) != 0)
		return NULL;

	thumb = a_thumbnails_scale_pixbuf(full, PIXMAP_THUMB_SIZE, PIXMAP_THUMB_SIZE);

	orientation = gdk_pixbuf_get_option (full, "orientation");

	original_width = gdk_pixbuf_get_width(full);
	original_height = gdk_pixbuf_get_height(full);


	swidth = g_strdup_printf("%d", original_width);
	sheight = g_strdup_printf("%d", original_height);
	ssize = g_strdup_printf(ST_SIZE_FMT, info.st_size);
	smtime = g_strdup_printf("%ld", (long) info.st_mtime);

	path = pathdup(pathname);
	uri = g_strconcat("file://", path, NULL);
	md5 = md5_hash(uri);
	g_free(path);
		
	to = g_string_new(HOME_DIR);
	g_string_append(to, THUMB_DIR);
	g_string_append(to, THUMB_SUB_DIR);
	g_mkdir_with_parents(to->str, 0700);
	g_string_append(to, md5);
	name_len = to->len + 4; /* Truncate to this length when renaming */
#ifdef WINDOWS
	g_string_append_printf(to, ".png.Viking");
#else
	g_string_append_printf(to, ".png.Viking-%ld", (long) getpid());
#endif

	g_free(md5);

	old_mask = umask(0077);
	gdk_pixbuf_save(thumb, to->str, "png", NULL,
			"tEXt::Thumb::Image::Width", swidth,
			"tEXt::Thumb::Image::Height", sheight,
			"tEXt::Thumb::Size", ssize,
			"tEXt::Thumb::MTime", smtime,
			"tEXt::Thumb::URI", uri,
			"tEXt::Software", PROJECT,
			"tEXt::Software::Orientation", orientation ? orientation : "0",
			NULL);
	umask(old_mask);

	/* We create the file ###.png.ROX-Filer-PID and rename it to avoid
	 * a race condition if two programs create the same thumb at
	 * once.
	 */
	{
		gchar *final;

		final = g_strndup(to->str, name_len);
		if (rename(to->str, final))
		{
			g_warning("Failed to rename '%s' to '%s': %s",
				  to->str, final, g_strerror(errno));
			g_object_unref ( G_OBJECT(thumb) );
			thumb = NULL; /* return NULL */
		}

		g_free(final);
	}

	g_string_free(to, TRUE);
	g_free(swidth);
	g_free(sheight);
	g_free(ssize);
	g_free(smtime);
	g_free(uri);

	return thumb;
}


GdkPixbuf *a_thumbnails_get(const gchar *pathname)
{
	GdkPixbuf *thumb = NULL;
	char *thumb_path, *md5, *uri, *path;
	const char *ssize, *smtime;
	struct stat info;

	path = pathdup(pathname);
	uri = g_strconcat("file://", path, NULL);
	md5 = md5_hash(uri);
	g_free(uri);
	
	thumb_path = g_strdup_printf("%s%s%s%s.png", HOME_DIR, THUMB_DIR, THUMB_SUB_DIR, md5);

	g_free(md5);

	thumb = gdk_pixbuf_new_from_file(thumb_path, NULL);
	if (!thumb)
		goto err;

	/* Note that these don't need freeing... */
	ssize = gdk_pixbuf_get_option(thumb, "tEXt::Thumb::Size");
	if (!ssize)
		goto err;

	smtime = gdk_pixbuf_get_option(thumb, "tEXt::Thumb::MTime");
	if (!smtime)
		goto err;

	if (stat(path, &info) != 0)
		goto err;

	if (info.st_mtime != atol(smtime) || info.st_size != atol(ssize))
		goto err;

	goto out;
err:
	if (thumb)
		g_object_unref ( G_OBJECT ( thumb ) );
	thumb = NULL;
out:
	g_free(path);
	g_free(thumb_path);
	return thumb;
}

/* pathdup() stuff */

static char *pathdup(const char *path)
{
	char real[MAXPATHLEN];

	g_return_val_if_fail(path != NULL, NULL);

	if (realpath(path, real))
		return g_strdup(real);

	return g_strdup(path);
}

/*
 * This code implements the MD5 message-digest algorithm.
 * The algorithm is due to Ron Rivest. The original code was
 * written by Colin Plumb in 1993, and put in the public domain.
 * 
 * Modified to use glib datatypes. Put under GPL to simplify
 * licensing for ROX-Filer. Taken from Debian's dpkg package.
 *
 */

#define md5byte unsigned char

typedef struct _MD5Context MD5Context;

struct _MD5Context {
	guint32 buf[4];
	guint32 bytes[2];
	guint32 in[16];
};

static void MD5Init(MD5Context *ctx);
static void MD5Update(MD5Context *ctx, md5byte const *buf, unsigned len);
static char *MD5Final(MD5Context *ctx);
static void MD5Transform(guint32 buf[4], guint32 const in[16]);

#if G_BYTE_ORDER == G_BIG_ENDIAN
static void byteSwap(guint32 *buf, unsigned words)
{
	md5byte *p = (md5byte *)buf;

	do {
		*buf++ = (guint32)((unsigned)p[3] << 8 | p[2]) << 16 |
			((unsigned)p[1] << 8 | p[0]);
		p += 4;
	} while (--words);
}
#else
#define byteSwap(buf,words)
#endif

/*
 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
 * initialization constants.
 */
static void MD5Init(MD5Context *ctx)
{
	ctx->buf[0] = 0x67452301;
	ctx->buf[1] = 0xefcdab89;
	ctx->buf[2] = 0x98badcfe;
	ctx->buf[3] = 0x10325476;

	ctx->bytes[0] = 0;
	ctx->bytes[1] = 0;
}

/*
 * Update context to reflect the concatenation of another buffer full
 * of bytes.
 */
static void MD5Update(MD5Context *ctx, md5byte const *buf, unsigned len)
{
	guint32 t;

	/* Update byte count */

	t = ctx->bytes[0];
	if ((ctx->bytes[0] = t + len) < t)
		ctx->bytes[1]++;	/* Carry from low to high */

	t = 64 - (t & 0x3f);	/* Space available in ctx->in (at least 1) */
	if (t > len) {
		memcpy((md5byte *)ctx->in + 64 - t, buf, len);
		return;
	}
	/* First chunk is an odd size */
	memcpy((md5byte *)ctx->in + 64 - t, buf, t);
	byteSwap(ctx->in, 16);
	MD5Transform(ctx->buf, ctx->in);
	buf += t;
	len -= t;

	/* Process data in 64-byte chunks */
	while (len >= 64) {
		memcpy(ctx->in, buf, 64);
		byteSwap(ctx->in, 16);
		MD5Transform(ctx->buf, ctx->in);
		buf += 64;
		len -= 64;
	}

	/* Handle any remaining bytes of data. */
	memcpy(ctx->in, buf, len);
}

/*
 * Final wrapup - pad to 64-byte boundary with the bit pattern 
 * 1 0* (64-bit count of bits processed, MSB-first)
 * Returns the newly allocated string of the hash.
 */
static char *MD5Final(MD5Context *ctx)
{
	char *retval;
	int i;
	int count = ctx->bytes[0] & 0x3f;	/* Number of bytes in ctx->in */
	md5byte *p = (md5byte *)ctx->in + count;
	guint8	*bytes;

	/* Set the first char of padding to 0x80.  There is always room. */
	*p++ = 0x80;

	/* Bytes of padding needed to make 56 bytes (-8..55) */
	count = 56 - 1 - count;

	if (count < 0) {	/* Padding forces an extra block */
		memset(p, 0, count + 8);
		byteSwap(ctx->in, 16);
		MD5Transform(ctx->buf, ctx->in);
		p = (md5byte *)ctx->in;
		count = 56;
	}
	memset(p, 0, count);
	byteSwap(ctx->in, 14);

	/* Append length in bits and transform */
	ctx->in[14] = ctx->bytes[0] << 3;
	ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29;
	MD5Transform(ctx->buf, ctx->in);

	byteSwap(ctx->buf, 4);

	retval = g_malloc(33);
	bytes = (guint8 *) ctx->buf;
	for (i = 0; i < 16; i++)
		sprintf(retval + (i * 2), "%02x", bytes[i]);
	retval[32] = '\0';
	
	return retval;
}

# ifndef ASM_MD5

/* The four core functions - F1 is optimized somewhat */

/* #define F1(x, y, z) (x & y | ~x & z) */
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))

/* This is the central step in the MD5 algorithm. */
#define MD5STEP(f,w,x,y,z,in,s) \
	 (w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x)

/*
 * The core of the MD5 algorithm, this alters an existing MD5 hash to
 * reflect the addition of 16 longwords of new data.  MD5Update blocks
 * the data and converts bytes into longwords for this routine.
 */
static void MD5Transform(guint32 buf[4], guint32 const in[16])
{
	register guint32 a, b, c, d;

	a = buf[0];
	b = buf[1];
	c = buf[2];
	d = buf[3];

	MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
	MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
	MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
	MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
	MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
	MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
	MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
	MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
	MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
	MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
	MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
	MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
	MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
	MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
	MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
	MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);

	MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
	MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
	MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
	MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
	MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
	MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
	MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
	MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
	MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
	MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
	MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
	MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
	MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
	MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
	MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
	MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);

	MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
	MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
	MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
	MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
	MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
	MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
	MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
	MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
	MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
	MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
	MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
	MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
	MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
	MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
	MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
	MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);

	MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
	MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
	MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
	MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
	MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
	MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
	MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
	MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
	MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
	MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
	MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
	MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
	MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
	MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
	MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
	MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);

	buf[0] += a;
	buf[1] += b;
	buf[2] += c;
	buf[3] += d;
}

# endif /* ASM_MD5 */

static char *md5_hash(const char *message)
{
	MD5Context ctx;

	MD5Init(&ctx);
	MD5Update(&ctx, (md5byte *) message, strlen(message));
	return MD5Final(&ctx);
}
Commit	Line	Data
50a14534 EB	1	/*
	2	* viking -- GPS Data and Topo Analyzer, Explorer, and Manager
	3	*
	4	* Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	*/
	21
	22	/*
	23	* Large (and important) sections of this file were adapted from
	24	* ROX-Filer source code, Copyright (C) 2003, the ROX-Filer team,
	25	* originally licensed under the GPL v2 or greater (as above).
	26	*
	27	*/
	28
45acf79e MA	29	#ifdef HAVE_CONFIG_H
	30	#include "config.h"
	31	#endif
	32
50a14534	33	#include <stdlib.h>
45acf79e MA	34	#ifdef HAVE_UNISTD_H
	35	#include <unistd.h>
	36	#endif
50a14534 EB	37	#include <errno.h>
50a14534 EB	38	#include <string.h>
f83131b9 MA	39	#include <glib.h>
f83131b9 MA	40	#include <glib/gstdio.h>
50a14534 EB	41	#include "viking.h"
50a14534 EB	42	#include "thumbnails.h"
5bfafde9	43	#include "icons/icons.h"
50a14534 EB	44
	45	#ifdef __CYGWIN__
	46	#ifdef __CYGWIN_USE_BIG_TYPES__
	47	#define ST_SIZE_FMT "%lld"
	48	#else
	49	#define ST_SIZE_FMT "%ld"
	50	#endif
	51	#else
	52	/* FIXME -- on some systems this may need to me "lld", see ROX-Filer code */
	53	#define ST_SIZE_FMT "%ld"
	54	#endif
	55
	56	#undef MIN /* quit yer whining, gcc */
	57	#undef MAX
	58	#include <sys/param.h> /* for realpath() */
90e25247 GB	59	#ifndef MAX
	60	/* We need MAX macro and some system does not offer it */
	61	#define MAX(a,b) (((a)>(b))?(a):(b))
	62	#endif
50a14534	63
118b901b MA	64	#define HOME_DIR g_get_home_dir()
118b901b MA	65
50a14534	66	#ifdef WINDOWS
50a14534 EB	67	#define THUMB_DIR "\\THUMBNAILS\\" /* viking maps default viking\maps */
50a14534 EB	68	#define THUMB_SUB_DIR "normal\\"
50a14534 EB	69	#define realpath(X,Y) _fullpath(Y,X,MAX_PATH)
	70
	71	#else
50a14534 EB	72	#define THUMB_DIR "/.thumbnails/"
	73	#define THUMB_SUB_DIR "normal/"
	74	#endif
	75
	76	#define PIXMAP_THUMB_SIZE 128
	77
adc67de1 GB	78	#ifndef MAXPATHLEN
	79	#define MAXPATHLEN 1024
	80	#endif
	81
50a14534 EB	82	static char md5_hash(const char message);
	83	static char pathdup(const char path);
	84	static GdkPixbuf save_thumbnail(const char pathname, GdkPixbuf *full);
	85	static GdkPixbuf child_create_thumbnail(const gchar path);
	86
	87	gboolean a_thumbnails_exists ( const gchar *filename )
	88	{
	89	GdkPixbuf *pixbuf = a_thumbnails_get(filename);
	90	if ( pixbuf )
	91	{
	92	g_object_unref ( G_OBJECT ( pixbuf ) );
	93	return TRUE;
	94	}
	95	return FALSE;
	96	}
	97
	98	GdkPixbuf *a_thumbnails_get_default ()
	99	{
5bfafde9	100	return gdk_pixbuf_from_pixdata ( &thumbnails_pixbuf, FALSE, NULL );
50a14534 EB	101	}
	102
	103	/* filename must be absolute. you could have a function to make sure it exists and absolutize it */
	104
	105	void a_thumbnails_create(const gchar *filename)
	106	{
	107	GdkPixbuf *pixbuf = a_thumbnails_get(filename);
	108
	109	if ( ! pixbuf )
	110	pixbuf = child_create_thumbnail(filename);
	111
	112	if ( pixbuf )
	113	g_object_unref ( G_OBJECT ( pixbuf ) );
	114	}
	115
	116	GdkPixbuf a_thumbnails_scale_pixbuf(GdkPixbuf src, int max_w, int max_h)
	117	{
	118	int w, h;
	119
	120	w = gdk_pixbuf_get_width(src);
	121	h = gdk_pixbuf_get_height(src);
	122
	123	if (w <= max_w && h <= max_h)
	124	{
f2fcc2d2	125	g_object_ref ( G_OBJECT ( src ) );
50a14534 EB	126	return src;
	127	}
	128	else
	129	{
	130	float scale_x = ((float) w) / max_w;
	131	float scale_y = ((float) h) / max_h;
	132	float scale = MAX(scale_x, scale_y);
	133	int dest_w = w / scale;
	134	int dest_h = h / scale;
	135
	136	return gdk_pixbuf_scale_simple(src,
	137	MAX(dest_w, 1),
	138	MAX(dest_h, 1),
	139	GDK_INTERP_BILINEAR);
	140	}
	141	}
	142
	143	static GdkPixbuf child_create_thumbnail(const gchar path)
	144	{
6d0927b1	145	GdkPixbuf image, tmpbuf;
50a14534 EB	146
50a14534 EB	147	image = gdk_pixbuf_new_from_file(path, NULL);
778e43b4 RN	148	if (!image)
	149	return NULL;
	150
6d0927b1 GK	151	tmpbuf = gdk_pixbuf_apply_embedded_orientation(image);
	152	g_object_unref(G_OBJECT(image));
	153	image = tmpbuf;
50a14534 EB	154
	155	if (image)
	156	{
	157	GdkPixbuf *thumb = save_thumbnail(path, image);
f2fcc2d2	158	g_object_unref ( G_OBJECT ( image ) );
50a14534 EB	159	return thumb;
	160	}
	161
	162	return NULL;
	163	}
	164
	165	static GdkPixbuf save_thumbnail(const char pathname, GdkPixbuf *full)
	166	{
	167	struct stat info;
	168	gchar *path;
	169	int original_width, original_height;
6d0927b1	170	const gchar* orientation;
50a14534 EB	171	GString *to;
	172	char md5, swidth, sheight, ssize, smtime, uri;
	173	mode_t old_mask;
	174	int name_len;
	175	GdkPixbuf *thumb;
	176
	177	if (stat(pathname, &info) != 0)
	178	return NULL;
	179
	180	thumb = a_thumbnails_scale_pixbuf(full, PIXMAP_THUMB_SIZE, PIXMAP_THUMB_SIZE);
	181
6d0927b1 GK	182	orientation = gdk_pixbuf_get_option (full, "orientation");
6d0927b1 GK	183
50a14534 EB	184	original_width = gdk_pixbuf_get_width(full);
	185	original_height = gdk_pixbuf_get_height(full);
	186
	187
	188	swidth = g_strdup_printf("%d", original_width);
	189	sheight = g_strdup_printf("%d", original_height);
	190	ssize = g_strdup_printf(ST_SIZE_FMT, info.st_size);
	191	smtime = g_strdup_printf("%ld", (long) info.st_mtime);
	192
	193	path = pathdup(pathname);
	194	uri = g_strconcat("file://", path, NULL);
	195	md5 = md5_hash(uri);
	196	g_free(path);
	197
	198	to = g_string_new(HOME_DIR);
50a14534	199	g_string_append(to, THUMB_DIR);
50a14534	200	g_string_append(to, THUMB_SUB_DIR);
ab7f5df1	201	g_mkdir_with_parents(to->str, 0700);
50a14534 EB	202	g_string_append(to, md5);
	203	name_len = to->len + 4; /* Truncate to this length when renaming */
	204	#ifdef WINDOWS
	205	g_string_append_printf(to, ".png.Viking");
	206	#else
	207	g_string_append_printf(to, ".png.Viking-%ld", (long) getpid());
	208	#endif
	209
	210	g_free(md5);
	211
	212	old_mask = umask(0077);
	213	gdk_pixbuf_save(thumb, to->str, "png", NULL,
	214	"tEXt::Thumb::Image::Width", swidth,
	215	"tEXt::Thumb::Image::Height", sheight,
	216	"tEXt::Thumb::Size", ssize,
	217	"tEXt::Thumb::MTime", smtime,
	218	"tEXt::Thumb::URI", uri,
	219	"tEXt::Software", PROJECT,
6d0927b1	220	"tEXt::Software::Orientation", orientation ? orientation : "0",
50a14534 EB	221	NULL);
	222	umask(old_mask);
	223
	224	/* We create the file ###.png.ROX-Filer-PID and rename it to avoid
	225	* a race condition if two programs create the same thumb at
	226	* once.
	227	*/
	228	{
	229	gchar *final;
	230
	231	final = g_strndup(to->str, name_len);
	232	if (rename(to->str, final))
	233	{
	234	g_warning("Failed to rename '%s' to '%s': %s",
	235	to->str, final, g_strerror(errno));
	236	g_object_unref ( G_OBJECT(thumb) );
	237	thumb = NULL; /* return NULL */
	238	}
	239
	240	g_free(final);
	241	}
	242
	243	g_string_free(to, TRUE);
	244	g_free(swidth);
	245	g_free(sheight);
	246	g_free(ssize);
	247	g_free(smtime);
	248	g_free(uri);
	249
	250	return thumb;
	251	}
	252
	253
	254	GdkPixbuf a_thumbnails_get(const gchar pathname)
	255	{
	256	GdkPixbuf *thumb = NULL;
	257	char thumb_path, md5, uri, path;
	258	const char ssize, smtime;
	259	struct stat info;
	260
	261	path = pathdup(pathname);
	262	uri = g_strconcat("file://", path, NULL);
	263	md5 = md5_hash(uri);
	264	g_free(uri);
	265
	266	thumb_path = g_strdup_printf("%s%s%s%s.png", HOME_DIR, THUMB_DIR, THUMB_SUB_DIR, md5);
	267
	268	g_free(md5);
	269
	270	thumb = gdk_pixbuf_new_from_file(thumb_path, NULL);
	271	if (!thumb)
	272	goto err;
	273
	274	/* Note that these don't need freeing... */
	275	ssize = gdk_pixbuf_get_option(thumb, "tEXt::Thumb::Size");
	276	if (!ssize)
	277	goto err;
	278
	279	smtime = gdk_pixbuf_get_option(thumb, "tEXt::Thumb::MTime");
	280	if (!smtime)
	281	goto err;
	282
	283	if (stat(path, &info) != 0)
	284	goto err;
285
286	if (info.st_mtime != atol(smtime) \|\| info.st_size != atol(ssize))
287	goto err;
288
289	goto out;
290	err:
291	if (thumb)
f2fcc2d2	292	g_object_unref ( G_OBJECT ( thumb ) );
50a14534 EB	293	thumb = NULL;
	294	out:
	295	g_free(path);
	296	g_free(thumb_path);
	297	return thumb;
	298	}
	299
	300	/* pathdup() stuff */
	301
	302	static char pathdup(const char path)
	303	{
	304	char real[MAXPATHLEN];
	305
	306	g_return_val_if_fail(path != NULL, NULL);
	307
	308	if (realpath(path, real))
	309	return g_strdup(real);
	310
	311	return g_strdup(path);
	312	}
	313
	314	/*
	315	* This code implements the MD5 message-digest algorithm.
	316	* The algorithm is due to Ron Rivest. The original code was
	317	* written by Colin Plumb in 1993, and put in the public domain.
	318	*
	319	* Modified to use glib datatypes. Put under GPL to simplify
	320	* licensing for ROX-Filer. Taken from Debian's dpkg package.
	321	*
	322	*/
	323
	324	#define md5byte unsigned char
	325
	326	typedef struct _MD5Context MD5Context;
	327
	328	struct _MD5Context {
	329	guint32 buf[4];
	330	guint32 bytes[2];
	331	guint32 in[16];
	332	};
	333
	334	static void MD5Init(MD5Context *ctx);
	335	static void MD5Update(MD5Context ctx, md5byte const buf, unsigned len);
	336	static char MD5Final(MD5Context ctx);
	337	static void MD5Transform(guint32 buf[4], guint32 const in[16]);
	338
	339	#if G_BYTE_ORDER == G_BIG_ENDIAN
	340	static void byteSwap(guint32 *buf, unsigned words)
	341	{
	342	md5byte p = (md5byte )buf;
	343
	344	do {
	345	*buf++ = (guint32)((unsigned)p[3] << 8 \| p[2]) << 16 \|
	346	((unsigned)p[1] << 8 \| p[0]);
	347	p += 4;
	348	} while (--words);
	349	}
	350	#else
	351	#define byteSwap(buf,words)
	352	#endif
	353
	354	/*
	355	* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
	356	* initialization constants.
357	*/
358	static void MD5Init(MD5Context *ctx)
359	{
360	ctx->buf[0] = 0x67452301;
361	ctx->buf[1] = 0xefcdab89;
362	ctx->buf[2] = 0x98badcfe;
363	ctx->buf[3] = 0x10325476;
364
365	ctx->bytes[0] = 0;
366	ctx->bytes[1] = 0;
367	}
368
369	/*
370	* Update context to reflect the concatenation of another buffer full
371	* of bytes.
372	*/
373	static void MD5Update(MD5Context ctx, md5byte const buf, unsigned len)
374	{
375	guint32 t;
376
377	/* Update byte count */
378
379	t = ctx->bytes[0];
380	if ((ctx->bytes[0] = t + len) < t)
381	ctx->bytes[1]++; /* Carry from low to high */
382
383	t = 64 - (t & 0x3f); /* Space available in ctx->in (at least 1) */
384	if (t > len) {
385	memcpy((md5byte *)ctx->in + 64 - t, buf, len);
386	return;
387	}
388	/* First chunk is an odd size */
389	memcpy((md5byte *)ctx->in + 64 - t, buf, t);
390	byteSwap(ctx->in, 16);
391	MD5Transform(ctx->buf, ctx->in);
392	buf += t;
393	len -= t;
394
395	/* Process data in 64-byte chunks */
396	while (len >= 64) {
397	memcpy(ctx->in, buf, 64);
398	byteSwap(ctx->in, 16);
399	MD5Transform(ctx->buf, ctx->in);
400	buf += 64;
401	len -= 64;
402	}
403
404	/* Handle any remaining bytes of data. */
405	memcpy(ctx->in, buf, len);
406	}
407
408	/*
409	* Final wrapup - pad to 64-byte boundary with the bit pattern
410	* 1 0* (64-bit count of bits processed, MSB-first)
411	* Returns the newly allocated string of the hash.
412	*/
413	static char MD5Final(MD5Context ctx)
414	{
415	char *retval;
416	int i;
417	int count = ctx->bytes[0] & 0x3f; /* Number of bytes in ctx->in */
418	md5byte p = (md5byte )ctx->in + count;
419	guint8 *bytes;
420
421	/* Set the first char of padding to 0x80. There is always room. */
422	*p++ = 0x80;
423
424	/* Bytes of padding needed to make 56 bytes (-8..55) */
425	count = 56 - 1 - count;
426
427	if (count < 0) { /* Padding forces an extra block */
428	memset(p, 0, count + 8);
429	byteSwap(ctx->in, 16);
430	MD5Transform(ctx->buf, ctx->in);
431	p = (md5byte *)ctx->in;
432	count = 56;
433	}
434	memset(p, 0, count);
435	byteSwap(ctx->in, 14);
436
437	/* Append length in bits and transform */
438	ctx->in[14] = ctx->bytes[0] << 3;
439	ctx->in[15] = ctx->bytes[1] << 3 \| ctx->bytes[0] >> 29;
440	MD5Transform(ctx->buf, ctx->in);
441
442	byteSwap(ctx->buf, 4);
443
444	retval = g_malloc(33);
445	bytes = (guint8 *) ctx->buf;
446	for (i = 0; i < 16; i++)
447	sprintf(retval + (i * 2), "%02x", bytes[i]);
448	retval[32] = '\0';
449
450	return retval;
451	}
452
453	# ifndef ASM_MD5
454
455	/* The four core functions - F1 is optimized somewhat */
456
457	/* #define F1(x, y, z) (x & y \| ~x & z) */
458	#define F1(x, y, z) (z ^ (x & (y ^ z)))
459	#define F2(x, y, z) F1(z, x, y)
460	#define F3(x, y, z) (x ^ y ^ z)
461	#define F4(x, y, z) (y ^ (x \| ~z))
462
463	/* This is the central step in the MD5 algorithm. */
464	#define MD5STEP(f,w,x,y,z,in,s) \
465	(w += f(x,y,z) + in, w = (w<<s \| w>>(32-s)) + x)
466
467	/*
468	* The core of the MD5 algorithm, this alters an existing MD5 hash to
469	* reflect the addition of 16 longwords of new data. MD5Update blocks
470	* the data and converts bytes into longwords for this routine.
471	*/
472	static void MD5Transform(guint32 buf[4], guint32 const in[16])
473	{
474	register guint32 a, b, c, d;
475
476	a = buf[0];
477	b = buf[1];
478	c = buf[2];
479	d = buf[3];
480
481	MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
482	MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
483	MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
484	MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
485	MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
486	MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
487	MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
488	MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
489	MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
490	MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
491	MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
492	MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
493	MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
494	MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
495	MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
496	MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
497
498	MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
499	MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
500	MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
501	MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
502	MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
503	MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
504	MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
505	MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
506	MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
507	MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
508	MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
509	MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
510	MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
511	MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
512	MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
513	MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
514
515	MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
516	MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
517	MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
518	MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
519	MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
520	MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
521	MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
522	MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
523	MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
524	MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
525	MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
526	MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
527	MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
528	MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
529	MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
530	MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
531
532	MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
533	MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
534	MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
535	MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
536	MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
537	MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
538	MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
539	MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
540	MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
541	MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
542	MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
543	MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
544	MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
545	MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
546	MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
547	MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
548
549	buf[0] += a;
550	buf[1] += b;
551	buf[2] += c;
552	buf[3] += d;
553	}
554
555	# endif /* ASM_MD5 */
556
557	static char md5_hash(const char message)
558	{
559	MD5Context ctx;
560
561	MD5Init(&ctx);
4243132f	562	MD5Update(&ctx, (md5byte *) message, strlen(message));
50a14534 EB	563	return MD5Final(&ctx);
50a14534 EB	564	}