AuroraMiddleware/harfbuzz
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Minor touches on hb_blob_create_from_file (#1079)

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* Handle EINTR on fallback reader
* Increase fallback reader limitation size limitation to 2 << 28
* Ensure _O_BINARY does exist if MMAP is used on Windows
  (maybe superfluous but makes me more confident)
This commit is contained in:
Ebrahim Byagowi 2018-06-27 14:13:26 +04:30 committed by GitHub
parent 01dff1ea1a
commit fa090ed4d4
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 9 deletions
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22
src/hb-blob.cc
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@ -489,10 +489,10 @@ hb_blob_t::try_make_writable (void)
#if defined(_WIN32) || defined(__CYGWIN__)
# include <windows.h>
#endif
#ifndef _O_BINARY
# define _O_BINARY 0
#else
# ifndef _O_BINARY
# define _O_BINARY 0
# endif
#endif
#ifndef MAP_NORESERVE
@ -594,8 +594,7 @@ fail_without_close:
// The following tries to read a file without knowing its size beforehand
// It's used for systems without mmap concept or to read from pipes
int len = 0;
int allocated = BUFSIZ * 16;
unsigned long len = 0, allocated = BUFSIZ * 16;
char *blob = (char *) malloc (allocated);
if (unlikely (blob == nullptr)) return hb_blob_get_empty ();
@ -607,16 +606,21 @@ fail_without_close:
if (allocated - len < BUFSIZ)
{
allocated *= 2;
// Don't allocate more than 200MB, our mmap reader still
// Don't allocate and go more than ~536MB, our mmap reader still
// can cover files like that but lets limit our fallback reader
if (unlikely (allocated > 200000000)) goto fread_fail;
if (unlikely (allocated > (2 << 28))) goto fread_fail;
char *new_blob = (char *) realloc (blob, allocated);
if (unlikely (new_blob == nullptr)) goto fread_fail;
blob = new_blob;
}
len += fread (blob + len, 1, allocated - len, fp);
unsigned long addition = fread (blob + len, 1, allocated - len, fp);
int err = ferror (fp);
if (unlikely (err == EINTR)) continue;
if (unlikely (ferror (fp))) goto fread_fail;
len += addition;
}
return hb_blob_create (blob, len, HB_MEMORY_MODE_WRITABLE, blob,