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harfbuzz/src/hb-blob.cc

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/*
* Copyright © 2009 Red Hat, Inc.
* Copyright © 2018 Ebrahim Byagowi
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
*/
#include "hb.hh"
#include "hb-blob.hh"
#ifdef HAVE_SYS_MMAN_H
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <sys/mman.h>
#endif /* HAVE_SYS_MMAN_H */
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
/**
* SECTION: hb-blob
* @title: hb-blob
* @short_description: Binary data containers
* @include: hb.h
*
* Blobs wrap a chunk of binary data to handle lifecycle management of data
* while it is passed between client and HarfBuzz. Blobs are primarily used
* to create font faces, but also to access font face tables, as well as
* pass around other binary data.
**/
DEFINE_NULL_INSTANCE (hb_blob_t) =
{
HB_OBJECT_HEADER_STATIC,
true, /* immutable */
nullptr, /* data */
0, /* length */
HB_MEMORY_MODE_READONLY, /* mode */
nullptr, /* user_data */
nullptr /* destroy */
};
/**
* hb_blob_create: (skip)
* @data: Pointer to blob data.
* @length: Length of @data in bytes.
* @mode: Memory mode for @data.
* @user_data: Data parameter to pass to @destroy.
* @destroy: Callback to call when @data is not needed anymore.
*
* Creates a new "blob" object wrapping @data. The @mode parameter is used
* to negotiate ownership and lifecycle of @data.
*
* Return value: New blob, or the empty blob if something failed or if @length is
* zero. Destroy with hb_blob_destroy().
*
* Since: 0.9.2
**/
hb_blob_t *
hb_blob_create (const char *data,
unsigned int length,
hb_memory_mode_t mode,
void *user_data,
hb_destroy_func_t destroy)
{
hb_blob_t *blob;
if (!length ||
length >= 1u << 31 ||
!(blob = hb_object_create<hb_blob_t> ())) {
if (destroy)
destroy (user_data);
return hb_blob_get_empty ();
}
blob->data = data;
blob->length = length;
blob->mode = mode;
blob->user_data = user_data;
blob->destroy = destroy;
if (blob->mode == HB_MEMORY_MODE_DUPLICATE) {
blob->mode = HB_MEMORY_MODE_READONLY;
if (!blob->try_make_writable ()) {
hb_blob_destroy (blob);
return hb_blob_get_empty ();
}
}
return blob;
}
static void
_hb_blob_destroy (void *data)
{
hb_blob_destroy ((hb_blob_t *) data);
}
/**
* hb_blob_create_sub_blob:
* @parent: Parent blob.
* @offset: Start offset of sub-blob within @parent, in bytes.
* @length: Length of sub-blob.
*
* Returns a blob that represents a range of bytes in @parent. The new
* blob is always created with %HB_MEMORY_MODE_READONLY, meaning that it
* will never modify data in the parent blob. The parent data is not
* expected to be modified, and will result in undefined behavior if it
* is.
*
* Makes @parent immutable.
*
* Return value: New blob, or the empty blob if something failed or if
* @length is zero or @offset is beyond the end of @parent's data. Destroy
* with hb_blob_destroy().
*
* Since: 0.9.2
**/
hb_blob_t *
hb_blob_create_sub_blob (hb_blob_t *parent,
unsigned int offset,
unsigned int length)
{
hb_blob_t *blob;
if (!length || offset >= parent->length)
return hb_blob_get_empty ();
hb_blob_make_immutable (parent);
blob = hb_blob_create (parent->data + offset,
MIN (length, parent->length - offset),
HB_MEMORY_MODE_READONLY,
hb_blob_reference (parent),
_hb_blob_destroy);
return blob;
}
/**
* hb_blob_copy_writable_or_fail:
* @blob: A blob.
*
* Makes a writable copy of @blob.
*
* Return value: New blob, or nullptr if allocation failed.
*
* Since: 1.8.0
**/
hb_blob_t *
hb_blob_copy_writable_or_fail (hb_blob_t *blob)
{
blob = hb_blob_create (blob->data,
blob->length,
HB_MEMORY_MODE_DUPLICATE,
nullptr,
nullptr);
if (unlikely (blob == hb_blob_get_empty ()))
blob = nullptr;
return blob;
}
/**
* hb_blob_get_empty:
*
* Returns the singleton empty blob.
*
* See TODO:link object types for more information.
*
* Return value: (transfer full): the empty blob.
*
* Since: 0.9.2
**/
hb_blob_t *
hb_blob_get_empty (void)
{
return const_cast<hb_blob_t *> (&Null(hb_blob_t));
}
/**
* hb_blob_reference: (skip)
* @blob: a blob.
*
* Increases the reference count on @blob.
*
* See TODO:link object types for more information.
*
* Return value: @blob.
*
* Since: 0.9.2
**/
hb_blob_t *
hb_blob_reference (hb_blob_t *blob)
{
return hb_object_reference (blob);
}
/**
* hb_blob_destroy: (skip)
* @blob: a blob.
*
* Decreases the reference count on @blob, and if it reaches zero, destroys
* @blob, freeing all memory, possibly calling the destroy-callback the blob
* was created for if it has not been called already.
*
* See TODO:link object types for more information.
*
* Since: 0.9.2
**/
void
hb_blob_destroy (hb_blob_t *blob)
{
if (!hb_object_destroy (blob)) return;
blob->fini_shallow ();
free (blob);
}
/**
* hb_blob_set_user_data: (skip)
* @blob: a blob.
* @key: key for data to set.
* @data: data to set.
* @destroy: callback to call when @data is not needed anymore.
* @replace: whether to replace an existing data with the same key.
*
* Return value:
*
* Since: 0.9.2
**/
hb_bool_t
hb_blob_set_user_data (hb_blob_t *blob,
hb_user_data_key_t *key,
void * data,
hb_destroy_func_t destroy,
hb_bool_t replace)
{
return hb_object_set_user_data (blob, key, data, destroy, replace);
}
/**
* hb_blob_get_user_data: (skip)
* @blob: a blob.
* @key: key for data to get.
*
*
*
* Return value: (transfer none):
*
* Since: 0.9.2
**/
void *
hb_blob_get_user_data (hb_blob_t *blob,
hb_user_data_key_t *key)
{
return hb_object_get_user_data (blob, key);
}
/**
* hb_blob_make_immutable:
* @blob: a blob.
*
*
*
* Since: 0.9.2
**/
void
hb_blob_make_immutable (hb_blob_t *blob)
{
if (hb_object_is_inert (blob))
return;
if (blob->immutable)
return;
blob->immutable = true;
}
/**
* hb_blob_is_immutable:
* @blob: a blob.
*
*
*
* Return value: TODO
*
* Since: 0.9.2
**/
hb_bool_t
hb_blob_is_immutable (hb_blob_t *blob)
{
return blob->immutable;
}
/**
* hb_blob_get_length:
* @blob: a blob.
*
*
*
* Return value: the length of blob data in bytes.
*
* Since: 0.9.2
**/
unsigned int
hb_blob_get_length (hb_blob_t *blob)
{
return blob->length;
}
/**
* hb_blob_get_data:
* @blob: a blob.
* @length: (out):
*
*
*
* Returns: (transfer none) (array length=length):
*
* Since: 0.9.2
**/
const char *
hb_blob_get_data (hb_blob_t *blob, unsigned int *length)
{
if (length)
*length = blob->length;
return blob->data;
}
/**
* hb_blob_get_data_writable:
* @blob: a blob.
* @length: (out): output length of the writable data.
*
* Tries to make blob data writable (possibly copying it) and
* return pointer to data.
*
* Fails if blob has been made immutable, or if memory allocation
* fails.
*
* Returns: (transfer none) (array length=length): Writable blob data,
* or %NULL if failed.
*
* Since: 0.9.2
**/
char *
hb_blob_get_data_writable (hb_blob_t *blob, unsigned int *length)
{
if (!blob->try_make_writable ()) {
if (length)
*length = 0;
return nullptr;
}
if (length)
*length = blob->length;
return const_cast<char *> (blob->data);
}
bool
hb_blob_t::try_make_writable_inplace_unix (void)
{
#if defined(HAVE_SYS_MMAN_H) && defined(HAVE_MPROTECT)
uintptr_t pagesize = -1, mask, length;
const char *addr;
#if defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
pagesize = (uintptr_t) sysconf (_SC_PAGE_SIZE);
#elif defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
pagesize = (uintptr_t) sysconf (_SC_PAGESIZE);
#elif defined(HAVE_GETPAGESIZE)
pagesize = (uintptr_t) getpagesize ();
#endif
if ((uintptr_t) -1L == pagesize) {
DEBUG_MSG_FUNC (BLOB, this, "failed to get pagesize: %s", strerror (errno));
return false;
}
DEBUG_MSG_FUNC (BLOB, this, "pagesize is %lu", (unsigned long) pagesize);
mask = ~(pagesize-1);
addr = (const char *) (((uintptr_t) this->data) & mask);
length = (const char *) (((uintptr_t) this->data + this->length + pagesize-1) & mask) - addr;
DEBUG_MSG_FUNC (BLOB, this,
"calling mprotect on [%p..%p] (%lu bytes)",
addr, addr+length, (unsigned long) length);
if (-1 == mprotect ((void *) addr, length, PROT_READ | PROT_WRITE)) {
DEBUG_MSG_FUNC (BLOB, this, "mprotect failed: %s", strerror (errno));
return false;
}
this->mode = HB_MEMORY_MODE_WRITABLE;
DEBUG_MSG_FUNC (BLOB, this,
"successfully made [%p..%p] (%lu bytes) writable\n",
addr, addr+length, (unsigned long) length);
return true;
#else
return false;
#endif
}
bool
hb_blob_t::try_make_writable_inplace (void)
{
DEBUG_MSG_FUNC (BLOB, this, "making writable inplace\n");
if (this->try_make_writable_inplace_unix ())
return true;
DEBUG_MSG_FUNC (BLOB, this, "making writable -> FAILED\n");
/* Failed to make writable inplace, mark that */
this->mode = HB_MEMORY_MODE_READONLY;
return false;
}
bool
hb_blob_t::try_make_writable (void)
{
if (this->immutable)
return false;
if (this->mode == HB_MEMORY_MODE_WRITABLE)
return true;
if (this->mode == HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE && this->try_make_writable_inplace ())
return true;
if (this->mode == HB_MEMORY_MODE_WRITABLE)
return true;
DEBUG_MSG_FUNC (BLOB, this, "current data is -> %p\n", this->data);
char *new_data;
new_data = (char *) malloc (this->length);
if (unlikely (!new_data))
return false;
DEBUG_MSG_FUNC (BLOB, this, "dupped successfully -> %p\n", this->data);
memcpy (new_data, this->data, this->length);
this->destroy_user_data ();
this->mode = HB_MEMORY_MODE_WRITABLE;
this->data = new_data;
this->user_data = new_data;
this->destroy = free;
return true;
}
/*
* Mmap
*/
#ifdef HAVE_MMAP
# include <sys/types.h>
# include <sys/stat.h>
# include <fcntl.h>
#endif
#if defined(_WIN32) || defined(__CYGWIN__)
# include <windows.h>
#else
# ifndef O_BINARY
# define O_BINARY 0
# endif
#endif
#ifndef MAP_NORESERVE
# define MAP_NORESERVE 0
#endif
struct hb_mapped_file_t
{
char *contents;
unsigned long length;
#if defined(_WIN32) || defined(__CYGWIN__)
HANDLE mapping;
#endif
};
#if (defined(HAVE_MMAP) || defined(_WIN32) || defined(__CYGWIN__)) && !defined(HB_NO_MMAP)
static void
_hb_mapped_file_destroy (void *file_)
{
hb_mapped_file_t *file = (hb_mapped_file_t *) file_;
#ifdef HAVE_MMAP
munmap (file->contents, file->length);
#elif defined(_WIN32) || defined(__CYGWIN__)
UnmapViewOfFile (file->contents);
CloseHandle (file->mapping);
#else
assert (0); // If we don't have mmap we shouldn't reach here
#endif
free (file);
}
#endif
/**
* hb_blob_create_from_file:
* @file_name: font filename.
*
* Returns: A hb_blob_t pointer with the content of the file
*
* Since: 1.7.7
**/
hb_blob_t *
hb_blob_create_from_file (const char *file_name)
{
/* Adopted from glib's gmappedfile.c with Matthias Clasen and
Allison Lortie permission but changed a lot to suit our need. */
#if defined(HAVE_MMAP) && !defined(HB_NO_MMAP)
hb_mapped_file_t *file = (hb_mapped_file_t *) calloc (1, sizeof (hb_mapped_file_t));
if (unlikely (!file)) return hb_blob_get_empty ();
int fd = open (file_name, O_RDONLY | O_BINARY, 0);
if (unlikely (fd == -1)) goto fail_without_close;
struct stat st;
if (unlikely (fstat (fd, &st) == -1)) goto fail;
file->length = (unsigned long) st.st_size;
file->contents = (char *) mmap (nullptr, file->length, PROT_READ,
MAP_PRIVATE | MAP_NORESERVE, fd, 0);
if (unlikely (file->contents == MAP_FAILED)) goto fail;
close (fd);
return hb_blob_create (file->contents, file->length,
HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE, (void *) file,
(hb_destroy_func_t) _hb_mapped_file_destroy);
fail:
close (fd);
fail_without_close:
free (file);
#elif (defined(_WIN32) || defined(__CYGWIN__)) && !defined(HB_NO_MMAP)
hb_mapped_file_t *file = (hb_mapped_file_t *) calloc (1, sizeof (hb_mapped_file_t));
if (unlikely (!file)) return hb_blob_get_empty ();
HANDLE fd;
unsigned int size = strlen (file_name) + 1;
wchar_t * wchar_file_name = (wchar_t *) malloc (sizeof (wchar_t) * size);
if (unlikely (wchar_file_name == nullptr)) goto fail_without_close;
mbstowcs (wchar_file_name, file_name, size);
#if defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP)
{
CREATEFILE2_EXTENDED_PARAMETERS ceparams = { 0 };
ceparams.dwSize = sizeof(CREATEFILE2_EXTENDED_PARAMETERS);
ceparams.dwFileAttributes = FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED & 0xFFFF;
ceparams.dwFileFlags = FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED & 0xFFF00000;
ceparams.dwSecurityQosFlags = FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED & 0x000F0000;
ceparams.lpSecurityAttributes = nullptr;
ceparams.hTemplateFile = nullptr;
fd = CreateFile2 (wchar_file_name, GENERIC_READ, FILE_SHARE_READ,
OPEN_EXISTING, &ceparams);
}
#else
fd = CreateFileW (wchar_file_name, GENERIC_READ, FILE_SHARE_READ, nullptr,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED,
nullptr);
#endif
free (wchar_file_name);
if (unlikely (fd == INVALID_HANDLE_VALUE)) goto fail_without_close;
#if defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP)
{
LARGE_INTEGER length;
GetFileSizeEx (fd, &length);
file->length = length.LowPart;
file->mapping = CreateFileMappingFromApp (fd, nullptr, PAGE_READONLY, length.QuadPart, nullptr);
}
#else
file->length = (unsigned long) GetFileSize (fd, nullptr);
file->mapping = CreateFileMapping (fd, nullptr, PAGE_READONLY, 0, 0, nullptr);
#endif
if (unlikely (file->mapping == nullptr)) goto fail;
#if defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP)
file->contents = (char *) MapViewOfFileFromApp (file->mapping, FILE_MAP_READ, 0, 0);
#else
file->contents = (char *) MapViewOfFile (file->mapping, FILE_MAP_READ, 0, 0, 0);
#endif
if (unlikely (file->contents == nullptr)) goto fail;
CloseHandle (fd);
return hb_blob_create (file->contents, file->length,
HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE, (void *) file,
(hb_destroy_func_t) _hb_mapped_file_destroy);
fail:
CloseHandle (fd);
fail_without_close:
free (file);
#endif
/* The following tries to read a file without knowing its size beforehand
It's used as a fallback for systems without mmap or to read from pipes */
unsigned long len = 0, allocated = BUFSIZ * 16;
char *data = (char *) malloc (allocated);
if (unlikely (data == nullptr)) return hb_blob_get_empty ();
FILE *fp = fopen (file_name, "rb");
if (unlikely (fp == nullptr)) goto fread_fail_without_close;
while (!feof (fp))
{
if (allocated - len < BUFSIZ)
{
allocated *= 2;
/* 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 > (2 << 28))) goto fread_fail;
char *new_data = (char *) realloc (data, allocated);
if (unlikely (new_data == nullptr)) goto fread_fail;
data = new_data;
}
unsigned long addition = fread (data + len, 1, allocated - len, fp);
int err = ferror (fp);
#ifdef EINTR // armcc doesn't have it
if (unlikely (err == EINTR)) continue;
#endif
if (unlikely (err)) goto fread_fail;
len += addition;
}
return hb_blob_create (data, len, HB_MEMORY_MODE_WRITABLE, data,
(hb_destroy_func_t) free);
fread_fail:
fclose (fp);
fread_fail_without_close:
free (data);
return hb_blob_get_empty ();
}
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