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/* See LICENSE file for copyright and license details. */
#include "common.h"
int
libskrift_open_font_fd(LIBSKRIFT_FONT **fontp, int fd)
{
int saved_errno;
struct stat st;
char *mem = NULL, *new;
size_t size = 0, off = 0;
int mmapped = 0;
ssize_t r;
saved_errno = errno;
if (fstat(fd, &st) < 0 || !st.st_size || !S_ISREG(st.st_mode)) {
fallback:
for (;;) {
if (off + 2048 > size) {
size += 8192;
new = realloc(mem, size);
if (!new) {
free(mem);
return -1;
}
mem = new;
}
r = read(fd, &mem[off], size - off);
if (r <= 0) {
if (!r)
break;
free(mem);
return -1;
}
off += (size_t)r;
}
size = off;
new = realloc(mem, size);
if (new)
mem = new;
errno = saved_errno;
} else {
mem = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (mem == MAP_FAILED || !mem)
goto fallback;
size = (size_t)st.st_size;
mmapped = 1;
}
if (libskrift_open_font_mem(fontp, mem, size)) {
if (mmapped)
munmap(mem, size);
else
free(mem);
return -1;
}
(*fontp)->memory_free = mmapped ? NULL : mem;
(*fontp)->memory_unmap = mmapped ? mem : NULL;
(*fontp)->memory_size = size;
return 0;
}
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