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make cropng compile with mingw.

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Marisa the Magician 2021-03-05 11:23:48 +01:00
commit 8d0c3e84f2
1 changed files with 16 additions and 7 deletions
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23
cropng.c
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@ -1,12 +1,21 @@
#define _DEFAULT_SOURCE
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <endian.h>
#include <png.h>
uint32_t endianswap( uint32_t n )
{
// if we're in a big endian system, we don't need this
uint16_t testme = 0x1234;
if ( *(uint8_t*)(&testme) == 0x12 ) return n;
uint32_t on;
for ( int i=0; i<4; i++ )
*(((uint8_t*)(&on))+i) = *(((uint8_t*)(&n))+(3-i));
return on;
}
const char* fmtname( int bd, int col )
{
if ( col == PNG_COLOR_TYPE_PALETTE )
@ -118,13 +127,13 @@ int loadpng( const char *fname, uint8_t **idata, uint32_t *w, uint32_t *h, int32
if ( memcmp(unk[i].name,"grAb",4) ) continue;
if ( unk[i].size != 8 )
{
fprintf(stderr," grAb chunk has invalid size '%lu' ('8' expected).\n",unk[i].size);
fprintf(stderr," grAb chunk has invalid size '%zu' ('8' expected).\n",unk[i].size);
png_destroy_read_struct(&pngp,&infp,0);
fclose(pf);
return 0;
}
*x = be32toh(*(uint32_t*)unk[i].data);
*y = be32toh(*(uint32_t*)(unk[i].data+4));
*x = endianswap(*(uint32_t*)unk[i].data);
*y = endianswap(*(uint32_t*)(unk[i].data+4));
}
if ( *x || *y ) printf(" Read %ux%u%s image with offsets %+d,%+d.\n",*w,*h,fmtname(*bd,*col),*x,*y);
else printf(" Read %ux%u%s image.\n",*w,*h,fmtname(*bd,*col));
@ -178,8 +187,8 @@ int savepng( const char *fname, uint8_t *odata, uint32_t w, uint32_t h, int32_t
if ( x || y )
{
uint32_t grabs[2];
grabs[0] = htobe32(x);
grabs[1] = htobe32(y);
grabs[0] = endianswap(x);
grabs[1] = endianswap(y);
png_unknown_chunk grab =
{
.name = "grAb",