media/libjpeg/jmemnobs.c@b8a032363ba2 (annotated)
media/libjpeg/jmemnobs.c
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* |
| michael@0 | 2 | * jmemnobs.c |
| michael@0 | 3 | * |
| michael@0 | 4 | * Copyright (C) 1992-1996, Thomas G. Lane. |
| michael@0 | 5 | * This file is part of the Independent JPEG Group's software. |
| michael@0 | 6 | * For conditions of distribution and use, see the accompanying README file. |
| michael@0 | 7 | * |
| michael@0 | 8 | * This file provides a really simple implementation of the system- |
| michael@0 | 9 | * dependent portion of the JPEG memory manager. This implementation |
| michael@0 | 10 | * assumes that no backing-store files are needed: all required space |
| michael@0 | 11 | * can be obtained from malloc(). |
| michael@0 | 12 | * This is very portable in the sense that it'll compile on almost anything, |
| michael@0 | 13 | * but you'd better have lots of main memory (or virtual memory) if you want |
| michael@0 | 14 | * to process big images. |
| michael@0 | 15 | * Note that the max_memory_to_use option is ignored by this implementation. |
| michael@0 | 16 | */ |
| michael@0 | 17 | |
| michael@0 | 18 | #define JPEG_INTERNALS |
| michael@0 | 19 | #include "jinclude.h" |
| michael@0 | 20 | #include "jpeglib.h" |
| michael@0 | 21 | #include "jmemsys.h" /* import the system-dependent declarations */ |
| michael@0 | 22 | |
| michael@0 | 23 | #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */ |
| michael@0 | 24 | extern void * malloc JPP((size_t size)); |
| michael@0 | 25 | extern void free JPP((void *ptr)); |
| michael@0 | 26 | #endif |
| michael@0 | 27 | |
| michael@0 | 28 | |
| michael@0 | 29 | /* |
| michael@0 | 30 | * Memory allocation and freeing are controlled by the regular library |
| michael@0 | 31 | * routines malloc() and free(). |
| michael@0 | 32 | */ |
| michael@0 | 33 | |
| michael@0 | 34 | GLOBAL(void *) |
| michael@0 | 35 | jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject) |
| michael@0 | 36 | { |
| michael@0 | 37 | return (void *) malloc(sizeofobject); |
| michael@0 | 38 | } |
| michael@0 | 39 | |
| michael@0 | 40 | GLOBAL(void) |
| michael@0 | 41 | jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject) |
| michael@0 | 42 | { |
| michael@0 | 43 | free(object); |
| michael@0 | 44 | } |
| michael@0 | 45 | |
| michael@0 | 46 | |
| michael@0 | 47 | /* |
| michael@0 | 48 | * "Large" objects are treated the same as "small" ones. |
| michael@0 | 49 | * NB: although we include FAR keywords in the routine declarations, |
| michael@0 | 50 | * this file won't actually work in 80x86 small/medium model; at least, |
| michael@0 | 51 | * you probably won't be able to process useful-size images in only 64KB. |
| michael@0 | 52 | */ |
| michael@0 | 53 | |
| michael@0 | 54 | GLOBAL(void FAR *) |
| michael@0 | 55 | jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject) |
| michael@0 | 56 | { |
| michael@0 | 57 | return (void FAR *) malloc(sizeofobject); |
| michael@0 | 58 | } |
| michael@0 | 59 | |
| michael@0 | 60 | GLOBAL(void) |
| michael@0 | 61 | jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject) |
| michael@0 | 62 | { |
| michael@0 | 63 | free(object); |
| michael@0 | 64 | } |
| michael@0 | 65 | |
| michael@0 | 66 | |
| michael@0 | 67 | /* |
| michael@0 | 68 | * This routine computes the total memory space available for allocation. |
| michael@0 | 69 | * Here we always say, "we got all you want bud!" |
| michael@0 | 70 | */ |
| michael@0 | 71 | |
| michael@0 | 72 | GLOBAL(size_t) |
| michael@0 | 73 | jpeg_mem_available (j_common_ptr cinfo, size_t min_bytes_needed, |
| michael@0 | 74 | size_t max_bytes_needed, size_t already_allocated) |
| michael@0 | 75 | { |
| michael@0 | 76 | return max_bytes_needed; |
| michael@0 | 77 | } |
| michael@0 | 78 | |
| michael@0 | 79 | |
| michael@0 | 80 | /* |
| michael@0 | 81 | * Backing store (temporary file) management. |
| michael@0 | 82 | * Since jpeg_mem_available always promised the moon, |
| michael@0 | 83 | * this should never be called and we can just error out. |
| michael@0 | 84 | */ |
| michael@0 | 85 | |
| michael@0 | 86 | GLOBAL(void) |
| michael@0 | 87 | jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info, |
| michael@0 | 88 | long total_bytes_needed) |
| michael@0 | 89 | { |
| michael@0 | 90 | ERREXIT(cinfo, JERR_NO_BACKING_STORE); |
| michael@0 | 91 | } |
| michael@0 | 92 | |
| michael@0 | 93 | |
| michael@0 | 94 | /* |
| michael@0 | 95 | * These routines take care of any system-dependent initialization and |
| michael@0 | 96 | * cleanup required. Here, there isn't any. |
| michael@0 | 97 | */ |
| michael@0 | 98 | |
| michael@0 | 99 | GLOBAL(long) |
| michael@0 | 100 | jpeg_mem_init (j_common_ptr cinfo) |
| michael@0 | 101 | { |
| michael@0 | 102 | return 0; /* just set max_memory_to_use to 0 */ |
| michael@0 | 103 | } |
| michael@0 | 104 | |
| michael@0 | 105 | GLOBAL(void) |
| michael@0 | 106 | jpeg_mem_term (j_common_ptr cinfo) |
| michael@0 | 107 | { |
| michael@0 | 108 | /* no work */ |
| michael@0 | 109 | } |
