+++ /dev/null
-/*
- * jmemsys.h
- *
- * Copyright (C) 1992-1994, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This include file defines the interface between the system-independent
- * and system-dependent portions of the JPEG memory manager. No other
- * modules need include it. (The system-independent portion is jmemmgr.c;
- * there are several different versions of the system-dependent portion.)
- *
- * This file works as-is for the system-dependent memory managers supplied
- * in the IJG distribution. You may need to modify it if you write a
- * custom memory manager. If system-dependent changes are needed in
- * this file, the best method is to #ifdef them based on a configuration
- * symbol supplied in jconfig.h, as we have done with USE_MSDOS_MEMMGR.
- */
-
-
-/* Short forms of external names for systems with brain-damaged linkers. */
-
-#ifdef NEED_SHORT_EXTERNAL_NAMES
-#define jpeg_get_small jGetSmall
-#define jpeg_free_small jFreeSmall
-#define jpeg_get_large jGetLarge
-#define jpeg_free_large jFreeLarge
-#define jpeg_mem_available jMemAvail
-#define jpeg_open_backing_store jOpenBackStore
-#define jpeg_mem_init jMemInit
-#define jpeg_mem_term jMemTerm
-#endif /* NEED_SHORT_EXTERNAL_NAMES */
-
-
-/*
- * These two functions are used to allocate and release small chunks of
- * memory. (Typically the total amount requested through jpeg_get_small is
- * no more than 20K or so; this will be requested in chunks of a few K each.)
- * Behavior should be the same as for the standard library functions malloc
- * and free; in particular, jpeg_get_small must return NULL on failure.
- * On most systems, these ARE malloc and free. jpeg_free_small is passed the
- * size of the object being freed, just in case it's needed.
- * On an 80x86 machine using small-data memory model, these manage near heap.
- */
-
-EXTERN void * jpeg_get_small JPP((j_common_ptr cinfo, size_t sizeofobject));
-EXTERN void jpeg_free_small JPP((j_common_ptr cinfo, void * object,
- size_t sizeofobject));
-
-/*
- * These two functions are used to allocate and release large chunks of
- * memory (up to the total free space designated by jpeg_mem_available).
- * The interface is the same as above, except that on an 80x86 machine,
- * far pointers are used. On most other machines these are identical to
- * the jpeg_get/free_small routines; but we keep them separate anyway,
- * in case a different allocation strategy is desirable for large chunks.
- */
-
-EXTERN void FAR * jpeg_get_large JPP((j_common_ptr cinfo,size_t sizeofobject));
-EXTERN void jpeg_free_large JPP((j_common_ptr cinfo, void FAR * object,
- size_t sizeofobject));
-
-/*
- * The macro MAX_ALLOC_CHUNK designates the maximum number of bytes that may
- * be requested in a single call to jpeg_get_large (and jpeg_get_small for that
- * matter, but that case should never come into play). This macro is needed
- * to model the 64Kb-segment-size limit of far addressing on 80x86 machines.
- * On those machines, we expect that jconfig.h will provide a proper value.
- * On machines with 32-bit flat address spaces, any large constant may be used.
- *
- * NB: jmemmgr.c expects that MAX_ALLOC_CHUNK will be representable as type
- * size_t and will be a multiple of sizeof(align_type).
- */
-
-#ifndef MAX_ALLOC_CHUNK /* may be overridden in jconfig.h */
-#define MAX_ALLOC_CHUNK 1000000000L
-#endif
-
-/*
- * This routine computes the total space still available for allocation by
- * jpeg_get_large. If more space than this is needed, backing store will be
- * used. NOTE: any memory already allocated must not be counted.
- *
- * There is a minimum space requirement, corresponding to the minimum
- * feasible buffer sizes; jmemmgr.c will request that much space even if
- * jpeg_mem_available returns zero. The maximum space needed, enough to hold
- * all working storage in memory, is also passed in case it is useful.
- * Finally, the total space already allocated is passed. If no better
- * method is available, cinfo->mem->max_memory_to_use - already_allocated
- * is often a suitable calculation.
- *
- * It is OK for jpeg_mem_available to underestimate the space available
- * (that'll just lead to more backing-store access than is really necessary).
- * However, an overestimate will lead to failure. Hence it's wise to subtract
- * a slop factor from the true available space. 5% should be enough.
- *
- * On machines with lots of virtual memory, any large constant may be returned.
- * Conversely, zero may be returned to always use the minimum amount of memory.
- */
-
-EXTERN long jpeg_mem_available JPP((j_common_ptr cinfo,
- long min_bytes_needed,
- long max_bytes_needed,
- long already_allocated));
-
-
-/*
- * This structure holds whatever state is needed to access a single
- * backing-store object. The read/write/close method pointers are called
- * by jmemmgr.c to manipulate the backing-store object; all other fields
- * are private to the system-dependent backing store routines.
- */
-
-#define TEMP_NAME_LENGTH 64 /* max length of a temporary file's name */
-
-#ifdef USE_MSDOS_MEMMGR /* DOS-specific junk */
-
-typedef unsigned short XMSH; /* type of extended-memory handles */
-typedef unsigned short EMSH; /* type of expanded-memory handles */
-
-typedef union {
- short file_handle; /* DOS file handle if it's a temp file */
- XMSH xms_handle; /* handle if it's a chunk of XMS */
- EMSH ems_handle; /* handle if it's a chunk of EMS */
-} handle_union;
-
-#endif /* USE_MSDOS_MEMMGR */
-
-typedef struct backing_store_struct * backing_store_ptr;
-
-typedef struct backing_store_struct {
- /* Methods for reading/writing/closing this backing-store object */
- JMETHOD(void, read_backing_store, (j_common_ptr cinfo,
- backing_store_ptr info,
- void FAR * buffer_address,
- long file_offset, long byte_count));
- JMETHOD(void, write_backing_store, (j_common_ptr cinfo,
- backing_store_ptr info,
- void FAR * buffer_address,
- long file_offset, long byte_count));
- JMETHOD(void, close_backing_store, (j_common_ptr cinfo,
- backing_store_ptr info));
-
- /* Private fields for system-dependent backing-store management */
-#ifdef USE_MSDOS_MEMMGR
- /* For the MS-DOS manager (jmemdos.c), we need: */
- handle_union handle; /* reference to backing-store storage object */
- char temp_name[TEMP_NAME_LENGTH]; /* name if it's a file */
-#else
- /* For a typical implementation with temp files, we need: */
- FILE * temp_file; /* stdio reference to temp file */
- char temp_name[TEMP_NAME_LENGTH]; /* name of temp file */
-#endif
-} backing_store_info;
-
-/*
- * Initial opening of a backing-store object. This must fill in the
- * read/write/close pointers in the object. The read/write routines
- * may take an error exit if the specified maximum file size is exceeded.
- * (If jpeg_mem_available always returns a large value, this routine can
- * just take an error exit.)
- */
-
-EXTERN void jpeg_open_backing_store JPP((j_common_ptr cinfo,
- backing_store_ptr info,
- long total_bytes_needed));
-
-
-/*
- * These routines take care of any system-dependent initialization and
- * cleanup required. jpeg_mem_init will be called before anything is
- * allocated (and, therefore, nothing in cinfo is of use except the error
- * manager pointer). It should return a suitable default value for
- * max_memory_to_use; this may subsequently be overridden by the surrounding
- * application. (Note that max_memory_to_use is only important if
- * jpeg_mem_available chooses to consult it ... no one else will.)
- * jpeg_mem_term may assume that all requested memory has been freed and that
- * all opened backing-store objects have been closed.
- */
-
-EXTERN long jpeg_mem_init JPP((j_common_ptr cinfo));
-EXTERN void jpeg_mem_term JPP((j_common_ptr cinfo));
projects / xonotic / netradiant.git / blobdiff