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[blob] Try to support resource fork fonts on macOS 

If the size of opened file is zero, try opening resource fork by
appending "/..namedfork/rsrc" to the file name. This is guarded with
__APPLE__ ifdef and uses _PATH_RSRCFORKSPEC macro from sys/paths.h.

Defining HB_NO_RESOURCE_FORK will disable this fallback.

Fixes https://github.com/harfbuzz/harfbuzz/issues/2383
This commit is contained in:
Khaled Hosny 2020-04-30 18:51:46 +02:00 committed by Ebrahim Byagowi
parent d6ddb232fc
commit 09b9d63e56
1 changed files with 50 additions and 0 deletions
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50
src/hb-blob.cc
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@ -35,6 +35,10 @@
#include <sys/mman.h>
#endif /* HAVE_SYS_MMAN_H */
#if !defined(HB_NO_RESOURCE_FORK) && defined(__APPLE__)
#include <sys/paths.h>
#endif
#include <stdio.h>
#include <stdlib.h>
@ -520,6 +524,39 @@ _hb_mapped_file_destroy (void *file_)
}
#endif
#ifdef _PATH_RSRCFORKSPEC
static int
_open_resource_fork(const char *file_name, hb_mapped_file_t *file)
{
size_t name_len = strlen (file_name);
size_t len = name_len + sizeof (_PATH_RSRCFORKSPEC);
char *rsrc_name = (char *) malloc (len);
if (unlikely (!rsrc_name)) return -1;
strncpy (rsrc_name, file_name, name_len);
strncpy (rsrc_name + name_len, _PATH_RSRCFORKSPEC,
sizeof (_PATH_RSRCFORKSPEC) - 1);
int fd = open (rsrc_name, O_RDONLY | O_BINARY, 0);
free (rsrc_name);
if (fd != -1)
{
struct stat st;
if (fstat (fd, &st) != -1)
file->length = (unsigned long) st.st_size;
else
{
close (fd);
fd = -1;
}
}
return fd;
}
#endif
/**
* hb_blob_create_from_file:
* @file_name: font filename.
@ -544,6 +581,19 @@ hb_blob_create_from_file (const char *file_name)
if (unlikely (fstat (fd, &st) == -1)) goto fail;
file->length = (unsigned long) st.st_size;
#ifdef _PATH_RSRCFORKSPEC
if (unlikely (file->length == 0))
{
int rfd = _open_resource_fork (file_name, file);
if (rfd != -1)
{
close (fd);
fd = rfd;
}
}
#endif
file->contents = (char *) mmap (nullptr, file->length, PROT_READ,
MAP_PRIVATE | MAP_NORESERVE, fd, 0);