Revision control
++ /*
++ * 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, 2024, 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 */
++
++
++ /*
++ * 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 */
++ }