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FF loader: Use mmap() for loading

This commit is contained in:
Kim Woelders 2021-09-14 18:13:22 +02:00
parent c4e4741cc8
commit a40971035e
1 changed files with 19 additions and 14 deletions
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33
src/modules/loaders/loader_ff.c
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@ -1,7 +1,11 @@
/* Farbfeld (http://tools.suckless.org/farbfeld) */
#include "loader_common.h"
#include <stdint.h>
#include <arpa/inet.h>
#include <sys/mman.h>
#define mm_check(p) ((const char *)(p) <= (const char *)fdata + im->fsize)
typedef struct {
unsigned char magic[8];
@ -12,20 +16,23 @@ int
load2(ImlibImage * im, int load_data)
{
int rc;
void *fdata;
int rowlen, i, j;
ff_hdr_t hdr_;
const ff_hdr_t *hdr;
uint16_t *row;
const uint16_t *row;
uint8_t *dat;
rc = LOAD_FAIL;
row = NULL;
if (im->fsize < (long)sizeof(ff_hdr_t))
return rc;
fdata = mmap(NULL, im->fsize, PROT_READ, MAP_SHARED, fileno(im->fp), 0);
if (fdata == MAP_FAILED)
return rc;
/* read and check the header */
hdr = &hdr_;
if (fread(&hdr_, 1, sizeof(ff_hdr_t), im->fp) != sizeof(ff_hdr_t))
goto quit;
hdr = fdata;
if (memcmp("farbfeld", hdr->magic, sizeof(hdr->magic)))
goto quit;
@ -49,14 +56,11 @@ load2(ImlibImage * im, int load_data)
rowlen = 4 * im->w; /* RGBA */
row = malloc(rowlen * sizeof(uint16_t));
if (!row)
goto quit;
dat = (uint8_t *) im->data;
for (i = 0; i < im->h; i++, dat += rowlen)
row = (uint16_t *) (hdr + 1);
for (i = 0; i < im->h; i++, dat += rowlen, row += rowlen)
{
if (fread(row, sizeof(uint16_t), rowlen, im->fp) != (size_t)rowlen)
if (!mm_check(row + rowlen))
goto quit;
for (j = 0; j < rowlen; j += 4)
@ -81,9 +85,10 @@ load2(ImlibImage * im, int load_data)
rc = LOAD_SUCCESS;
quit:
free(row);
if (rc <= 0)
__imlib_FreeData(im);
if (fdata != MAP_FAILED)
munmap(fdata, im->fsize);
return rc;
}