Renamed minilibx

1 files changed, 418 insertions, 0 deletions

diff --git a/minilibx/mlx_png.c b/minilibx/mlx_png.c
new file mode 100644
index 0000000..ca8024d
--- /dev/null
+++ b/minilibx/mlx_png.c
@@ -0,0 +1,418 @@
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <err.h>
+#include <string.h>
+#include <arpa/inet.h>
+
+#include "zlib.h"
+
+#include <OpenGL/gl3.h>
+#include	"mlx_int.h"
+
+
+#define	PNG_MAGIC_SIZE	8
+unsigned char magic[PNG_MAGIC_SIZE] = {137, 80, 78, 71, 13, 10, 26, 10};
+#define PNG_HDR_SIZE	13
+
+#define	Z_CHUNK	32768
+
+#define	ERR_MAGIC_SIZE	1
+#define	ERR_MAGIC_WRONG	2
+#define	ERR_STRUCT_INCOMPLETE	3
+#define	ERR_STRUCT_HDR	4
+#define	ERR_STRUCT_END	5
+#define	ERR_STRUCT_CRC	6
+#define	ERR_STRUCT_INCIMPL 7
+#define	ERR_STRUCT_DAT	8
+#define	ERR_STRUCT_MISSCHK	9
+#define	ERR_ZLIB	10
+#define	ERR_DATA_MISMATCH	11
+#define	ERR_DATA_FILTER	12
+char *(mipng_err[]) =
+{
+  "No error",
+  "Not enough size for magic",
+  "Wrong magic",
+  "Incomplete chunk structure",
+  "Duplicate or incorrect header",
+  "Duplicate or incorrect end",
+  "Invalid CRC in chunk",
+  "Incorrect header or configuration not implemented",
+  "Non consecutive dat chunks",
+  "Missing header/dat/end chunk(s)",
+  "Zlib inflate error",
+  "Inflated data size mismatch",
+  "Unknown scanline filter"
+};
+
+typedef struct png_info_s
+{
+  unsigned int	width;
+  unsigned int	height;
+  int		depth;
+  int		color;
+  int		interlace;
+  int		bpp;
+} png_info_t;
+
+
+int	mipng_is_type(unsigned char *ptr, char *type)
+{
+  if (ptr[4] == type[0] && ptr[5] == type[1] && ptr[6] == type[2] && ptr[7] == type[3])
+    return (1);
+  return (0);
+}
+
+
+unsigned char mipng_defilter_none(unsigned char *buff, int pos, int a, int b, int c)
+{ return (buff[pos]); }
+unsigned char mipng_defilter_sub(unsigned char *buff, int pos, int a, int b, int c)
+{ return (buff[pos]+(unsigned int)a); }
+unsigned char mipng_defilter_up(unsigned char *buff, int pos, int a, int b, int c)
+{ return (buff[pos]+(unsigned int)b); }
+unsigned char mipng_defilter_average(unsigned char *buff, int pos, int a, int b, int c)
+{ return (buff[pos]+((unsigned int)a+(unsigned int)b)/2); }
+unsigned char mipng_defilter_paeth(unsigned char *buff, int pos, int a, int b, int c)
+{
+  int	p;
+  int	result;
+
+  p = a + b - c;
+  if (abs(b - c) <= abs(a - c) && abs(b - c) <= abs(a + b - c - c))
+    result = a;
+  else
+    if (abs(a - c) <= abs(a + b - c - c))
+      result = b;
+    else
+      result = c;
+ return (buff[pos]+result);
+}
+
+
+
+unsigned char (*(mipng_defilter[]))(unsigned char *buff, int pos, int a, int b, int c) =
+{
+  mipng_defilter_none,
+  mipng_defilter_sub,
+  mipng_defilter_up,
+  mipng_defilter_average,
+  mipng_defilter_paeth
+};
+
+// only work for mlx mac or img 32bpp
+int	mipng_fill_img(mlx_img_list_t *img, unsigned char *buf, png_info_t *pi)
+{
+  unsigned int	current_filter;
+  int	ipos;
+  int	bpos;
+  int	ilen;
+  int	iline;
+  int	blen;
+  unsigned char tmp;
+  unsigned char *ibuf;
+
+  ibuf = (unsigned char *)img->buffer;
+  iline = img->width * UNIQ_BPP;
+  ilen = img->width * img->height * UNIQ_BPP;
+  blen = img->width * img->height * pi->bpp + img->height;
+  ipos = 0;
+  bpos = 0;
+  while (ipos < ilen && bpos < blen)
+    {
+      if ((ipos % iline) == 0)
+	{
+	  if ((current_filter = buf[bpos++]) > 4)
+	    return (ERR_DATA_FILTER);
+	}
+      ibuf[ipos] = mipng_defilter[current_filter](buf, bpos,
+				 ipos%iline>3?ibuf[ipos-UNIQ_BPP]:0,
+				 (ipos>=iline)?ibuf[ipos-iline]:0,
+				 (ipos>=iline && ipos%iline>3)?ibuf[ipos-iline-UNIQ_BPP]:0);
+      ipos ++;
+      bpos ++;
+      if (pi->depth == 16)
+	bpos ++;
+      if (ipos % 4 == 3 && pi->color == 2)  // no alpha
+	img->buffer[ipos++] = 0xFF;
+    }
+  if (ipos != ilen || bpos != blen)
+    {
+      //      printf("fill err ipos %d vs %d, bpos %d vs %d\n", ipos, ilen, bpos, blen);
+      return (ERR_DATA_MISMATCH);
+    }
+  ipos = 0;
+  while (ipos < ilen)
+    {
+      tmp = ibuf[ipos];
+      ibuf[ipos] = ibuf[ipos+2];
+      ibuf[ipos+2] = tmp;
+      ibuf[ipos+3] = 0xFF - ibuf[ipos+3];
+      ipos += UNIQ_BPP;
+    }
+  return (0);
+}
+
+
+int	mipng_data(mlx_img_list_t *img, unsigned char *dat, png_info_t *pi)
+{
+  unsigned int	len;
+  int		b_pos;
+  unsigned char *buffer;
+  int		ret;
+  int z_ret;
+  unsigned z_have;
+  z_stream z_strm;
+  unsigned char z_out[Z_CHUNK];
+
+  b_pos = 0;
+  if (!(buffer = malloc((long long)img->width*(long long)img->height*(long long)pi->bpp + img->height)))
+    err(1, "Can't malloc");
+  z_strm.zalloc = Z_NULL;
+  z_strm.zfree = Z_NULL;
+  z_strm.opaque = Z_NULL;
+  z_strm.avail_in = 0;
+  z_strm.next_in = Z_NULL;
+  z_ret = inflateInit(&z_strm);
+  if (z_ret != Z_OK)
+    return (ERR_ZLIB);
+
+  while (mipng_is_type(dat, "IDAT"))
+    {
+      len = *((unsigned int *)dat);
+      len = ntohl(len);
+      z_strm.avail_in = len;
+      z_strm.next_in = dat + 8;
+      z_strm.avail_out = 0;
+      while (z_strm.avail_out == 0)
+	{
+	  z_strm.avail_out = Z_CHUNK;
+	  z_strm.next_out = z_out;
+	  z_ret = inflate(&z_strm, Z_NO_FLUSH);
+	  //	  printf("inflate ret %d avail_out %d\n", z_ret, z_strm.avail_out);
+	  if (z_ret != Z_OK && z_ret != Z_STREAM_END)
+	    {
+	      inflateEnd(&z_strm);
+	      return (ERR_ZLIB);
+	    }
+	  if (b_pos + Z_CHUNK - z_strm.avail_out > img->width*img->height*pi->bpp+img->height)
+	    {
+	      inflateEnd(&z_strm);
+	      return (ERR_DATA_MISMATCH);
+	    }
+	  bcopy(z_out, buffer+b_pos, Z_CHUNK - z_strm.avail_out);
+	  b_pos += Z_CHUNK - z_strm.avail_out;
+	}
+      dat += len + 4 + 4 + 4;
+    } 
+  inflateEnd(&z_strm);
+  if (b_pos != img->width*img->height*pi->bpp+img->height)
+    {
+      //      printf("pb : bpos %d vs expected %d\n", b_pos, img->width*img->height*pi->bpp+img->height);
+      return (ERR_DATA_MISMATCH);
+    }
+  if ((ret = mipng_fill_img(img, buffer, pi)))
+    return (ret);
+  return (0);
+}
+
+
+
+int	mipng_magic(unsigned char *ptr, int size)
+{
+  int	i;
+
+  if (size < PNG_MAGIC_SIZE)
+    return (ERR_MAGIC_SIZE);
+  i = 0;
+  while (i < PNG_MAGIC_SIZE)
+    if (*(ptr++) != magic[i++])
+      return (ERR_MAGIC_WRONG);
+  return (0);
+}
+
+
+unsigned long crc_table[256] = { 0, 0x77073096, 0xee0e612c, 0x990951ba, 0x76dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0xedb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x9b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x1db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x6b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0xf00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x86d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x3b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x4db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0xd6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0xa00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x26d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x5005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0xcb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0xbdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d };
+
+// From http://www.w3.org/TR/PNG/#D-CRCAppendix
+int	mipng_crc(unsigned char *ptr, int len)
+{
+  unsigned int	file_crc;
+  unsigned long crc;
+  int		i;
+
+  file_crc = *((unsigned int *)(ptr+4+4+len));
+  file_crc = ntohl(file_crc);
+  
+  crc = 0xffffffffL;
+  i = 0;
+  while (i < len+4)
+    crc = crc_table[(crc ^ ptr[(i++)+4]) & 0xff] ^ (crc >> 8);
+  crc ^= 0xffffffffL;
+
+  if (file_crc != crc)
+    return (1);
+  return (0);
+}
+
+
+int	mipng_structure(unsigned char *ptr, int size, unsigned char **hdr, unsigned char **dat)
+{
+  unsigned int	len;
+  int		dat_state;
+  int		end;
+
+  dat_state = 0;
+  *hdr = NULL;
+  *dat = NULL;
+  end = 0;
+  while (size)
+    {
+      if (size >= 4) // length present
+	{
+	  len = *((unsigned int *)ptr);
+	  len = ntohl(len);
+	  if (size < 4 + 4 + 4 + len)
+	    return (ERR_STRUCT_INCOMPLETE);
+	  if (mipng_crc(ptr, len))
+	    return (ERR_STRUCT_CRC);
+	  //	  printf("found chunk len %d type %c%c%c%c\n", len, *(ptr+4), *(ptr+5), *(ptr+6), *(ptr+7));
+	  if (mipng_is_type(ptr, "IHDR"))
+	    {
+	      if (*hdr || len != PNG_HDR_SIZE)
+		return (ERR_STRUCT_HDR);
+	      *hdr = ptr;
+	    }
+	  if (mipng_is_type(ptr, "IEND"))
+	    {
+	      if (len != 0 || size != 4+4+4)
+		return (ERR_STRUCT_END);
+	      end = 1;
+	    }
+	  if (mipng_is_type(ptr, "IDAT"))
+	    {
+	      if (dat_state == 0)
+		{
+		  dat_state = 1;
+		  *dat = ptr;
+		}
+	      if (dat_state == 2)
+		return (ERR_STRUCT_DAT);
+	    }
+	  else
+	    if (dat_state == 1)
+	      dat_state = 2;
+	  size -= 4+4+4+len;
+	  ptr += 4+4+4+len;
+	}
+      else
+	return (ERR_STRUCT_INCOMPLETE);
+    }
+  if (*hdr == 0 || *dat == 0 || end == 0)
+    return (ERR_STRUCT_MISSCHK);
+  return (0);
+}
+
+
+int	mipng_verif_hdr(unsigned char *hdr, png_info_t *pi)
+{
+  unsigned int	compress;
+  unsigned int	filter;
+
+  hdr += 8;
+  pi->width = ntohl(*((unsigned long *)hdr));
+  pi->height = ntohl(*((unsigned long *)(hdr+4)));
+  pi->depth = *(hdr+8);
+  pi->color = *(hdr+9);
+  compress = *(hdr+10);
+  filter = *(hdr+11);
+  pi->interlace = *(hdr+12);
+  if (pi->width <= 0 || pi->height <= 0 || (pi->depth != 8 && pi->depth != 16)
+      || (pi->color != 2 && pi->color != 6) || compress != 0 || filter != 0 || pi->interlace != 0)
+    return (ERR_STRUCT_INCIMPL);
+  pi->bpp = pi->depth / 8;
+  if (pi->color == 2)
+    pi->bpp *= 3;
+  if (pi->color == 6)
+    pi->bpp *= 4;
+  //  printf("hdr info : %d x %d, depth %d, col type %d, comp %d, filter %d, interlace %d\nbpp is %d\n",
+  //	 pi->width, pi->height, pi->depth, pi->color, compress, filter, pi->interlace, pi->bpp);
+  return (0);
+}
+
+
+mlx_img_list_t	*mlx_int_parse_png(mlx_ptr_t *xvar, unsigned char *fptr, int size)
+{
+  int		err;
+  unsigned char *hdr;
+  unsigned char *dat;
+  png_info_t	pi;
+  mlx_img_list_t *img;
+
+  if ((err = mipng_magic(fptr, size)))
+    {
+      warnx("mlx PNG error : %s", mipng_err[err]);
+      return ((mlx_img_list_t *)0);
+    }
+  fptr += PNG_MAGIC_SIZE;
+  size -= PNG_MAGIC_SIZE;
+  if ((err = mipng_structure(fptr, size, &hdr, &dat)))
+    {
+      warnx("mlx PNG error : %s", mipng_err[err]);
+      return ((mlx_img_list_t *)0);
+    }
+  if ((err = mipng_verif_hdr(hdr, &pi)))
+    {
+      warnx("mlx PNG error : %s", mipng_err[err]);
+      return ((mlx_img_list_t *)0);
+    }
+  if (!(img = mlx_new_image(xvar, pi.width, pi.height)))
+    {
+      warnx("mlx PNG error : Can't create mlx image");
+      return ((mlx_img_list_t *)0);
+    }
+  if ((err = mipng_data(img, dat, &pi)))
+    {
+      mlx_destroy_image(xvar, img);
+      warnx("mlx PNG error : %s", mipng_err[err]);
+      return ((mlx_img_list_t *)0);
+    }
+  return (img);
+}
+
+
+
+
+void	*mlx_png_file_to_image(mlx_ptr_t *xvar, char *file, int *width, int *height)
+{
+  int			fd;
+  int			size;
+  unsigned char		*ptr;
+  mlx_img_list_t        *img;
+
+  if ((fd = open(file, O_RDONLY)) == -1 || (size = lseek(fd, 0, SEEK_END)) == -1 ||
+      (ptr = mmap(0, size, PROT_READ, MAP_PRIVATE, fd, 0)) == (void *)MAP_FAILED)
+    {
+      if (fd >= 0)
+        close(fd);
+      warnx("Can't map png file '%s'", file);
+      return ((void *)0);
+    }
+  if ((img = mlx_int_parse_png(xvar, ptr, size)))
+    {
+      *width = img->width;
+      *height = img->height;
+    }
+  else
+    {
+      *width = 0;
+      *height = 0;
+    }
+  munmap(ptr,size);
+  close(fd);
+  return (img);
+}