/* * 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 */ /* http://www.oracle.com/technetwork/articles/servers-storage-dev/standardheaderfiles-453865.html */ #ifndef _POSIX_C_SOURCE #define _POSIX_C_SOURCE 200809L #endif #include "hb-private.hh" #include "hb-debug.hh" #include "hb-blob-private.hh" #ifdef HAVE_SYS_MMAN_H #ifdef HAVE_UNISTD_H #include #endif /* HAVE_UNISTD_H */ #include #endif /* HAVE_SYS_MMAN_H */ #include #include #include /** * 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 ())) { 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) { static const hb_blob_t _hb_blob_nil = { HB_OBJECT_HEADER_STATIC, true, /* immutable */ nullptr, /* data */ 0, /* length */ HB_MEMORY_MODE_READONLY, /* mode */ nullptr, /* user_data */ nullptr /* destroy */ }; return const_cast (&_hb_blob_nil); } /** * 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; 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 (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 # include # include #endif #if defined(_WIN32) || defined(__CYGWIN__) # include #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 }; static void _hb_mapped_file_destroy (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); } /** * 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(NOMMAPFILEREADER) 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(NOMMAPFILEREADER) 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 = CreateFile (file_name, GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED, nullptr); if (unlikely (fd == INVALID_HANDLE_VALUE)) goto fail_without_close; file->length = (unsigned long) GetFileSize (fd, nullptr); file->mapping = CreateFileMapping (fd, nullptr, PAGE_READONLY, 0, 0, nullptr); if (unlikely (file->mapping == nullptr)) goto fail; file->contents = (char *) MapViewOfFile (file->mapping, FILE_MAP_READ, 0, 0, 0); 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); if (unlikely (err == EINTR)) continue; 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 (); }