| /* |
| * jmemnobs.c |
| * |
| * This file was part of the Independent JPEG Group's software: |
| * Copyright (C) 1992-1996, Thomas G. Lane. |
| * libjpeg-turbo Modifications: |
| * Copyright (C) 2017-2018, D. R. Commander. |
| * For conditions of distribution and use, see the accompanying README.ijg |
| * file. |
| * |
| * This file provides a really simple implementation of the system- |
| * dependent portion of the JPEG memory manager. This implementation |
| * assumes that no backing-store files are needed: all required space |
| * can be obtained from malloc(). |
| * This is very portable in the sense that it'll compile on almost anything, |
| * but you'd better have lots of main memory (or virtual memory) if you want |
| * to process big images. |
| */ |
| |
| #define JPEG_INTERNALS |
| #include "jinclude.h" |
| #include "jpeglib.h" |
| #include "jmemsys.h" /* import the system-dependent declarations */ |
| |
| #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */ |
| extern void *malloc(size_t size); |
| extern void free(void *ptr); |
| #endif |
| |
| |
| /* |
| * Memory allocation and freeing are controlled by the regular library |
| * routines malloc() and free(). |
| */ |
| |
| GLOBAL(void *) |
| jpeg_get_small(j_common_ptr cinfo, size_t sizeofobject) |
| { |
| return (void *)malloc(sizeofobject); |
| } |
| |
| GLOBAL(void) |
| jpeg_free_small(j_common_ptr cinfo, void *object, size_t sizeofobject) |
| { |
| free(object); |
| } |
| |
| |
| /* |
| * "Large" objects are treated the same as "small" ones. |
| */ |
| |
| GLOBAL(void *) |
| jpeg_get_large(j_common_ptr cinfo, size_t sizeofobject) |
| { |
| return (void *)malloc(sizeofobject); |
| } |
| |
| GLOBAL(void) |
| jpeg_free_large(j_common_ptr cinfo, void *object, size_t sizeofobject) |
| { |
| free(object); |
| } |
| |
| |
| /* |
| * This routine computes the total memory space available for allocation. |
| */ |
| |
| GLOBAL(size_t) |
| jpeg_mem_available(j_common_ptr cinfo, size_t min_bytes_needed, |
| size_t max_bytes_needed, size_t already_allocated) |
| { |
| if (cinfo->mem->max_memory_to_use) { |
| if ((size_t)cinfo->mem->max_memory_to_use > already_allocated) |
| return cinfo->mem->max_memory_to_use - already_allocated; |
| else |
| return 0; |
| } else { |
| /* Here we always say, "we got all you want bud!" */ |
| return max_bytes_needed; |
| } |
| } |
| |
| |
| /* |
| * Backing store (temporary file) management. |
| * Since jpeg_mem_available always promised the moon, |
| * this should never be called and we can just error out. |
| */ |
| |
| GLOBAL(void) |
| jpeg_open_backing_store(j_common_ptr cinfo, backing_store_ptr info, |
| long total_bytes_needed) |
| { |
| ERREXIT(cinfo, JERR_NO_BACKING_STORE); |
| } |
| |
| |
| /* |
| * These routines take care of any system-dependent initialization and |
| * cleanup required. Here, there isn't any. |
| */ |
| |
| GLOBAL(long) |
| jpeg_mem_init(j_common_ptr cinfo) |
| { |
| return 0; /* just set max_memory_to_use to 0 */ |
| } |
| |
| GLOBAL(void) |
| jpeg_mem_term(j_common_ptr cinfo) |
| { |
| /* no work */ |
| } |