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pngdefry.c
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pngdefry.c
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/* pngdefry.c v1.1 - public domain PNG reading/writing/modification, PNG writing
See "unlicense" statement at the end of this file.
[Jongware], 21-Jan-2012
Attempts to repair -iphone "optimized" PNG images by removing the invalid chunk "CgBI",
swapping pixel order from BGR(A) to RGB(A), and removing pre-multiplied alpha.
Use with care. No guarantees.
This program uses miniz.c (http://code.google.com/p/miniz/) by Rich Geldreich
(Rich Geldreich <[email protected]>, last updated May 27, 2011)
Version used is included in the original file package.
No-License Agreement
====================
This program is hereby put into the public domain, no limitations at all. Do with this code
whatever you want, I don't care. (Well, replacing my name with yours and leaving everything
else unchanged would be pretty lame.)
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include "miniz.c"
/** Global flags, set on the command line **/
int flag_Verbose = 0;
int flag_Process_Anyway = 0;
int flag_List_Chunks = 0;
int flag_Debug = 0;
int flag_UpdateAlpha = 1;
int repack_IDAT_size = 524288; /* 512K -- seems a bit much to me, axually, but have seen this used */
int flag_Rewrite = 0;
char *suffix = NULL;
char *outputPath = NULL;
unsigned char png_magic_bytes[] = "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A";
/** Chunk data comes here **/
struct chunk_t {
unsigned int length;
unsigned int id;
unsigned char *data;
unsigned int crc32;
};
int num_chunks = 0;
int max_chunks = 0;
struct chunk_t *pngChunks = NULL;
/** CRC32 generator for a block of data, thanks to Marc Autret
(he wrote this original code in Javascript for use in InDesign!) **/
unsigned int CRC_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
};
int crc32s (unsigned char *buf, int buf_length)
{
unsigned int c = 0xffffffff;
int i;
for (i=0; i < buf_length; i++ )
c = CRC_256[(c ^ buf[i]) & 0xff] ^ (c >> 8);
return (c ^ 0xffffffff);
};
int get_long (FILE *f)
{
return (fgetc(f)<<24) + (fgetc(f)<<16) + (fgetc(f)<<8) + fgetc(f);
}
int get_short (FILE *f)
{
return (fgetc(f)<<8) + fgetc(f);
}
int read_long (void *src)
{
return (((unsigned char *)src)[0]<<24) + (((unsigned char *)src)[1]<<16) + (((unsigned char *)src)[2]<<8) + ((unsigned char *)src)[3];
}
int init_chunk (FILE *f, unsigned int filelength)
{
struct chunk_t one_chunk;
unsigned char buf[8];
if (fread (buf, 1,4, f) != 4)
{
if (feof(f))
return 0;
if (flag_Debug)
printf (" informational : failed to read chunk length\n");
return -3;
}
one_chunk.length = (buf[0] << 24) + (buf[1] << 16) + (buf[2] << 8) + buf[3];
if (one_chunk.length > filelength-4)
{
if (flag_Debug)
printf (" informational : chunk length %u larger than file\n", one_chunk.length);
return -1;
}
one_chunk.data = (unsigned char *)malloc (one_chunk.length+4);
if (one_chunk.data == NULL)
{
if (flag_Debug)
printf (" informational : no memory for chunk length %u\n", one_chunk.length);
return -2;
}
if (fread (one_chunk.data, 1, one_chunk.length+4, f) != one_chunk.length+4)
{
if (flag_Debug)
printf (" informational : failed to read chunk length %u\n", one_chunk.length);
return -3;
}
one_chunk.id = (one_chunk.data[0] << 24) + (one_chunk.data[1] << 16) + (one_chunk.data[2] << 8) + one_chunk.data[3];
if (fread (buf, 1,4, f) != 4)
{
if (flag_Debug)
printf (" informational : failed to read chunk crc32\n");
return -3;
}
one_chunk.crc32 = (buf[0] << 24) + (buf[1] << 16) + (buf[2] << 8) + buf[3];
if (num_chunks >= max_chunks)
{
max_chunks += 8;
if (pngChunks == NULL)
pngChunks = (struct chunk_t *)malloc (max_chunks * sizeof(struct chunk_t));
else
pngChunks = (struct chunk_t *)realloc (pngChunks, max_chunks * sizeof(struct chunk_t));
}
pngChunks[num_chunks].id = one_chunk.id;
pngChunks[num_chunks].length = one_chunk.length;
pngChunks[num_chunks].data = one_chunk.data;
pngChunks[num_chunks].crc32 = one_chunk.crc32;
num_chunks++;
return 0;
}
void reset_chunks (void)
{
int i;
for (i=0; i<num_chunks; i++)
{
if (pngChunks[i].length && pngChunks[i].data)
{
free (pngChunks[i].data);
pngChunks[i].data = NULL;
}
}
num_chunks = 0;
}
void demultiplyAlpha (int wide, int high, unsigned char *data)
{
int x,y;
unsigned char *srcPtr;
srcPtr = data;
for (y=0; y<high; y++)
{
/* skip rowfilter -- it's assumed to be 0 here anyway! */
srcPtr++;
for (x=0; x<4*wide; x+=4)
{
if (srcPtr[x+3])
{
srcPtr[x] = (srcPtr[x]*255+(srcPtr[x+3]>>1))/srcPtr[x+3];
srcPtr[x+1] = (srcPtr[x+1]*255+(srcPtr[x+3]>>1))/srcPtr[x+3];
srcPtr[x+2] = (srcPtr[x+2]*255+(srcPtr[x+3]>>1))/srcPtr[x+3];
}
}
srcPtr += 4*wide;
}
}
void removeRowFilters (int wide, int high, unsigned char *data)
{
int x,y, rowfilter;
unsigned char *srcPtr, *upPtr;
srcPtr = data;
for (y=0; y<high; y++)
{
rowfilter = *srcPtr;
/* Need to save original filter for re-applying! */
/* *srcPtr = 0; */
srcPtr++;
switch (rowfilter)
{
case 0: // None
break;
case 1: // Sub
for (x=4; x<4*wide; x++)
{
srcPtr[x] += srcPtr[x-4];
}
break;
case 2: // Up
upPtr = srcPtr - 4*wide - 1;
if (y > 0)
{
for (x=0; x<4*wide; x++)
{
srcPtr[x] += upPtr[x];
}
}
break;
case 3: // Average
upPtr = srcPtr - 4*wide - 1;
if (y == 0)
{
for (x=4; x<4*wide; x++)
{
srcPtr[x] += (srcPtr[x-4]>>1);
}
} else
{
srcPtr[0] += (upPtr[x]>>1);
for (x=4; x<4*wide; x++)
{
srcPtr[x] += ((upPtr[x] + srcPtr[x-4])>>1);
}
}
break;
case 4: // Paeth
upPtr = srcPtr - 4*wide - 1;
{
int p,pa,pb,pc,value;
int leftpix,toppix,topleftpix;
for (x=0; x<4*wide; x++)
{
leftpix = 0;
toppix = 0;
topleftpix = 0;
if (x > 0)
leftpix = srcPtr[x-4];
if (y > 0)
{
toppix = upPtr[x];
if (x >= 4)
topleftpix = upPtr[x-4];
}
p = leftpix + toppix - topleftpix;
pa = p - leftpix; if (pa < 0) pa = -pa;
pb = p - toppix; if (pb < 0) pb = -pb;
pc = p - topleftpix; if (pc < 0) pc = -pc;
if (pa <= pb && pa <= pc)
value = leftpix;
else if (pb <= pc)
value = toppix;
else
value = topleftpix;
srcPtr[x] += value;
}
}
break;
default:
printf ("removerowfilter() : Unknown row filter %d\n", rowfilter);
}
srcPtr += 4*wide;
}
}
void applyRowFilters (int wide, int high, unsigned char *data)
{
int x,y, rowfilter;
unsigned char *srcPtr, *upPtr;
srcPtr = data;
for (y=0; y<high; y++)
{
rowfilter = *srcPtr;
srcPtr++;
switch (rowfilter)
{
case 0: // None
break;
case 1: // Sub
for (x=4*wide-1; x>=4; x--)
{
srcPtr[x] -= srcPtr[x-4];
}
break;
case 2: // Up
if (y > 0)
{
upPtr = srcPtr - 1;
for (x=4*wide-1; x>=0; x--)
{
srcPtr[x] -= upPtr[x];
}
}
break;
case 3: // Average
upPtr = srcPtr - 4*wide - 1;
if (y == 0)
{
for (x=4*wide-1; x>=4; x--)
{
srcPtr[x] -= (srcPtr[x-4]>>1);
}
} else
{
srcPtr[0] -= (upPtr[x]>>1);
for (x=4*wide-1; x>=4; x--)
{
srcPtr[x] -= ((upPtr[x] + srcPtr[x-4])>>1);
}
}
break;
case 4: // Paeth
upPtr = srcPtr - 1;
{
int p,pa,pb,pc,value;
int leftpix,toppix,topleftpix;
for (x=4*wide-1; x>=0; x--)
{
leftpix = 0;
toppix = 0;
topleftpix = 0;
if (x > 0)
leftpix = srcPtr[x-4];
if (y > 0)
{
toppix = upPtr[x];
if (x >= 4)
topleftpix = upPtr[x-4];
}
p = leftpix + toppix - topleftpix;
pa = p - leftpix; if (pa < 0) pa = -pa;
pb = p - toppix; if (pb < 0) pb = -pb;
pc = p - topleftpix; if (pc < 0) pc = -pc;
if (pa <= pb && pa <= pc)
value = leftpix;
else if (pb <= pc)
value = toppix;
else
value = topleftpix;
srcPtr[x] -= value;
}
}
break;
default:
printf ("applyrowfilter : Unknown row filter %d\n", rowfilter);
}
srcPtr += 4*wide;
}
}
int process (char *filename)
{
FILE *f;
unsigned int length;
int i;
unsigned char buf[16];
/* This is what we're looking for */
int isPhoney = 0;
/* Standard IHDR items: */
unsigned int imgwidth, imgheight, bitdepth,colortype, compression, filter, interlace;
/* Derived IHRD items: */
unsigned int bitspp;
unsigned int bytespp;
unsigned int bytespline;
struct chunk_t *ihdr_chunk = NULL;
int idat_first_index = 0;
unsigned char *all_idat = NULL;
unsigned int total_idat_size = 0;
/* Adam7 interlacing information */
int Starting_Row [] = { 0, 0, 4, 0, 2, 0, 1 };
int Starting_Col [] = { 0, 4, 0, 2, 0, 1, 0 };
int Row_Increment [] = { 8, 8, 8, 4, 4, 2, 2 };
int Col_Increment [] = { 8, 8, 4, 4, 2, 2, 1 };
int row_filter_bytes = 0;
/* Needed for unpacking/repacking */
unsigned char *data_out;
int out_length;
unsigned char *data_repack = NULL;
int repack_size, repack_length;
/* New file name comes here */
char *write_file_name = NULL;
FILE *write_file;
int write_block_size;
/* int i,j,b;
int blocklength, blockid;
unsigned int filterbytes;
int isInterlaced = 0; */
int didShowName = 0;
int crc, result;
f = fopen (filename, "rb");
if (!f)
{
printf ("%s : not found or could not be opened\n", filename);
return 0;
}
fseek (f, 0, SEEK_END);
length = ftell (f);
fseek (f, 0, SEEK_SET);
i = 0;
fread (buf,1,8, f); i += 8;
if (memcmp (buf, png_magic_bytes, 8))
{
printf ("%s : not a PNG file\n", filename);
fclose (f);
return 0;
}
result = init_chunk (f, length);
if (result < 0)
{
fclose (f);
switch (result)
{
case -1: printf ("%s : invalid chunk size\n", filename); break;
case -2: printf ("%s : out of memory\n", filename); break;
case -3: printf ("%s : premature end of file\n", filename); break;
}
reset_chunks ();
return 0;
}
isPhoney = 1;
if (pngChunks[0].id != 0x43674249) /* "CgBI" */
{
isPhoney = 0;
printf ("%s : not an -iphone crushed PNG file\n", filename);
if (!flag_Process_Anyway)
{
fclose (f);
reset_chunks ();
return 0;
}
didShowName = 1;
}
do
{
result = init_chunk (f, length);
if (result < 0)
{
fclose (f);
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
switch (result)
{
case -1: printf ("invalid chunk size\n"); break;
case -2: printf ("out of memory\n"); break;
case -3: printf ("premature end of file\n"); break;
default: printf ("error code %d\n", result);
}
reset_chunks ();
return 0;
}
if (num_chunks > 0 && pngChunks[num_chunks-1].id == 0x49454E44) /* "IEND" */
break;
} while (!feof(f));
if (pngChunks[num_chunks-1].id != 0x49454E44) /* "IEND" */
{
fclose (f);
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("missing IEND chunk\n");
reset_chunks ();
return 0;
}
if (fgetc (f) != EOF)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("Extra data after IEND, very suspicious! Excluded from conversion\n");
}
fclose (f);
if (flag_List_Chunks)
{
for (i=0; i<num_chunks; i++)
{
if (!didShowName)
{
didShowName = 1;
printf ("%s :\n", filename);
}
printf (" chunk : %c%c%c%c length %6u CRC32 %08X", (pngChunks[i].id >> 24) & 0xff,(pngChunks[i].id >> 16) & 0xff, (pngChunks[i].id >> 8) & 0xff,pngChunks[i].id & 0xff, pngChunks[i].length, pngChunks[i].crc32);
crc = crc32s (pngChunks[i].data, pngChunks[i].length+4);
if (pngChunks[i].crc32 != crc)
printf (" --> CRC32 check invalid! Should be %08X", crc);
printf ("\n");
}
} else
{
for (i=0; i<num_chunks; i++)
{
crc = crc32s (pngChunks[i].data, pngChunks[i].length+4);
if (pngChunks[i].crc32 != crc)
{
if (!didShowName)
{
didShowName = 1;
printf ("%s :\n", filename);
}
printf (" chunk : %c%c%c%c length %6u CRC32 %08X", (pngChunks[i].id >> 24) & 0xff,(pngChunks[i].id >> 16) & 0xff, (pngChunks[i].id >> 8) & 0xff,pngChunks[i].id & 0xff, pngChunks[i].length, pngChunks[i].crc32);
printf (" -> invalid, changed to %08X\n", crc);
pngChunks[i].crc32 = crc;
}
}
}
if (pngChunks[0].id == 0x43674249) /* "CgBI" */
{
if (num_chunks > 0 && pngChunks[1].id == 0x49484452) /* "IHDR" */
ihdr_chunk = &pngChunks[1];
} else
{
if (pngChunks[0].id == 0x49484452) /* "IHDR" */
ihdr_chunk = &pngChunks[0];
}
if (ihdr_chunk == NULL)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("no IHDR chunk found\n");
reset_chunks ();
return 0;
}
if (ihdr_chunk->length != 13)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("IHDR chunk length incorrect\n");
reset_chunks ();
return 0;
}
imgwidth = read_long (&ihdr_chunk->data[4]);
imgheight = read_long (&ihdr_chunk->data[8]);
bitdepth = ihdr_chunk->data[12];
colortype = ihdr_chunk->data[13];
compression = ihdr_chunk->data[14];
filter = ihdr_chunk->data[15];
interlace = ihdr_chunk->data[16];
if (imgwidth == 0 || imgheight == 0 || imgwidth > 2147483647 || imgheight > 2147483647)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("image dimensions invalid\n");
reset_chunks ();
return 0;
}
if (compression != 0)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("unknown compression type %d\n", compression);
reset_chunks ();
return 0;
}
if (filter != 0)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("unknown filter type %d\n", filter);
reset_chunks ();
return 0;
}
if (interlace != 0 && interlace != 1)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("unknown interlace type %d\n", interlace);
reset_chunks ();
return 0;
}
/*** From PNG Specs, http://www.w3.org/TR/PNG-Chunks.html
Color Allowed Interpretation
Type Bit Depths
------ ---------- ----------------------------------
0 1,2,4,8,16 Each pixel is a grayscale sample.
2 8,16 Each pixel is an R,G,B triple.
3 1,2,4,8 Each pixel is a palette index;
a PLTE chunk must appear.
4 8,16 Each pixel is a grayscale sample,
followed by an alpha sample.
6 8,16 Each pixel is an R,G,B triple,
followed by an alpha sample.
***/
i = 0;
switch (colortype)
{
case 0:
if (bitdepth == 1 ||
bitdepth == 2 ||
bitdepth == 4 ||
bitdepth == 8 ||
bitdepth == 16)
i = 1;
bitspp = bitdepth;
break;
case 2:
if (bitdepth == 8 ||
bitdepth == 16)
i = 1;
bitspp = 3*bitdepth;
break;
case 3:
if (bitdepth == 1 ||
bitdepth == 2 ||
bitdepth == 4 ||
bitdepth == 8)
i = 1;
bitspp = bitdepth;
break;
case 4:
if (bitdepth == 8 ||
bitdepth == 16)
i = 1;
bitspp = 2*bitdepth;
break;
case 6:
if (bitdepth == 8 ||
bitdepth == 16)
i = 1;
bitspp = 4*bitdepth;
break;
default:
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("unknown color type %d\n", colortype);
reset_chunks ();
return 0;
}
if (!i)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("invalid bit depth %d for color type %d\n", bitdepth, colortype);
reset_chunks ();
return 0;
}
bytespline = (imgwidth*bitspp+7)/8;
/* Warning!
This value is only valid for 8/16 bit images! */
bytespp = (bitspp+7)/8;
if (flag_Verbose)
{
if (!didShowName)
{
didShowName = 1;
printf ("%s :\n", filename);
}
printf (" image width : %u\n", imgwidth);
printf (" image height : %u\n", imgheight);
printf (" bit depth : %u\n", bitdepth);
printf (" color type : %u\n", colortype);
printf (" compression : %u\n", compression);
printf (" filter : %u\n", filter);
printf (" interlace : %u\n", interlace);
printf (" bits per pixel : %d\n", bitspp);
printf (" bytes per line : %d\n", bytespline);
}
row_filter_bytes = imgheight;
if (interlace == 1)
{
int w,h,pass;
if (flag_Verbose)
printf (" Adam7 interlacing:\n");
row_filter_bytes = 0;
for (pass=0; pass<7; pass++)
{
/* Formula taken from pngcheck ! */
w = (imgwidth - Starting_Col[pass] + Col_Increment[pass] - 1)/Col_Increment[pass];
h = (imgheight - Starting_Row[pass] + Row_Increment[pass] - 1)/Row_Increment[pass];
if (flag_Verbose)
printf (" pass %d: %d x %d\n", pass, w, h);
row_filter_bytes += h;
}
}
if (flag_Verbose)
{
printf (" row filter bytes : %u\n", row_filter_bytes);
printf (" expected data size : %u bytes\n", bytespline * imgheight + row_filter_bytes);
}
for (i=0; i<num_chunks; i++)
{
if (pngChunks[i].id == 0x49444154) /* "IDAT" */
{
idat_first_index = i;
break;
}
}
if (i == num_chunks)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("no IDAT chunks found\n");
reset_chunks ();
return 0;
}
/** Test for consecutive IDAT chunks */
/* continue where we left off */
while (i < num_chunks)
{
if (pngChunks[i].id != 0x49444154) /* "IDAT" */
break;
total_idat_size += pngChunks[i].length;
i++;
}
/* test the remaining chunks */
while (i < num_chunks)
{
if (pngChunks[i].id == 0x49444154) /* "IDAT" */
break;
i++;
}
if (i != num_chunks)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("IDAT chunks are not consecutive\n");
reset_chunks ();
return 0;
}
if (total_idat_size == 0)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("all IDAT chunks are empty\n");
reset_chunks ();
return 0;
}
/* Only need to re-write the image data for -phone 8 bit RGB and RGBA images */
/* Note To Self: Is that true? What about 16 bit images? What about palette images? */
/* Okay -- checked the above, it appears these two do NOT get fried. */
/* Swap BGR to RGB, BGRA to RGBA */
if (bitdepth == 8 &&
(colortype == 2 || /* Each pixel is an R,G,B triple (8 or 16 bits) */
colortype == 6)) /* Each pixel is an R,G,B triple, followed by an alpha sample (8 or 16 bits) */
{
if (isPhoney && flag_Verbose)
printf (" swapping BGR(A) to RGB(A)\n");
/*** Gather all IDATs into one ***/
if (flag_Debug)
printf (" informational : total idat size: %u\n", total_idat_size);
all_idat = (unsigned char *)malloc (total_idat_size);
if (all_idat == NULL)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("out of memory\n");
reset_chunks ();
return 0;
}
i = idat_first_index;
total_idat_size = 0;
while (i < num_chunks && pngChunks[i].id == 0x49444154) /* "IDAT" */
{
memcpy (all_idat+total_idat_size, pngChunks[i].data+4, pngChunks[i].length);
total_idat_size += pngChunks[i].length;
i++;
}
/*** So far everything appears to check out. Let's try uncompressing the IDAT chunks. ***/
data_out = (unsigned char *)malloc (bytespline * imgheight + row_filter_bytes);
if (data_out == NULL)
{
free (all_idat);
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("out of memory\n");
reset_chunks ();
return 0;
}
if (isPhoney)
out_length = tinfl_decompress_mem_to_mem(data_out, bytespline * imgheight + row_filter_bytes, all_idat, total_idat_size, 0);
else
out_length = tinfl_decompress_mem_to_mem(data_out, bytespline * imgheight + row_filter_bytes, all_idat, total_idat_size, TINFL_FLAG_PARSE_ZLIB_HEADER);
free (all_idat);
all_idat = NULL;
if (out_length <= 0)
{
free (data_out);
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("unspecified decompression error\n");
reset_chunks ();
return 0;
}
if (out_length != imgheight*bytespline + row_filter_bytes)
{
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("decompression error, expected %u but got %u bytes\n", imgheight*bytespline + row_filter_bytes, out_length);
free (data_out);
reset_chunks ();
return 0;
}
if (flag_Verbose)
printf (" uncompressed size : %u bytes\n", bytespline * imgheight + row_filter_bytes);
if (isPhoney || flag_Process_Anyway)
{
if (interlace == 1) /* needs Adam7 unpacking! */
{
int x,y, b, row;
int pass, w,h;
int startat;
/* check if all row filters are okay */
y = 0;
for (pass=0; pass<7; pass++)
{
w = (imgwidth - Starting_Col[pass] + Col_Increment[pass] - 1)/Col_Increment[pass];
h = (imgheight - Starting_Row[pass] + Row_Increment[pass] - 1)/Row_Increment[pass];
row=0;
while (row < h)
{
if (data_out[y] > 4)
{
free (data_out);
if (didShowName)
printf (" ");
else
{
didShowName = 1;
printf ("%s : ", filename);
}
printf ("unknown row filter type (%d)\n", data_out[y]);
reset_chunks ();
return 0;
}
/* skip row filter byte */
y++;
/* skip rest of row */