DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 1 | /* |
DRC | b24a722 | 2013-01-01 10:13:34 +0000 | [diff] [blame] | 2 | * jdatadst-tj.c |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 3 | * |
DRC | b24a722 | 2013-01-01 10:13:34 +0000 | [diff] [blame] | 4 | * This file was part of the Independent JPEG Group's software: |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 5 | * Copyright (C) 1994-1996, Thomas G. Lane. |
DRC | b5f2e45 | 2013-01-01 10:17:03 +0000 | [diff] [blame] | 6 | * Modified 2009-2012 by Guido Vollbeding. |
DRC | a6ef282 | 2013-09-28 03:23:49 +0000 | [diff] [blame] | 7 | * libjpeg-turbo Modifications: |
DRC | 6399d0a | 2019-04-23 14:10:04 -0500 | [diff] [blame] | 8 | * Copyright (C) 2011, 2014, 2016, 2019, D. R. Commander. |
DRC | 7e3acc0 | 2015-10-10 10:25:46 -0500 | [diff] [blame] | 9 | * For conditions of distribution and use, see the accompanying README.ijg |
| 10 | * file. |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 11 | * |
| 12 | * This file contains compression data destination routines for the case of |
| 13 | * emitting JPEG data to memory or to a file (or any stdio stream). |
| 14 | * While these routines are sufficient for most applications, |
| 15 | * some will want to use a different destination manager. |
| 16 | * IMPORTANT: we assume that fwrite() will correctly transcribe an array of |
| 17 | * JOCTETs into 8-bit-wide elements on external storage. If char is wider |
| 18 | * than 8 bits on your machine, you may need to do some tweaking. |
| 19 | */ |
| 20 | |
| 21 | /* this is not a core library module, so it doesn't define JPEG_INTERNALS */ |
| 22 | #include "jinclude.h" |
| 23 | #include "jpeglib.h" |
| 24 | #include "jerror.h" |
| 25 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 26 | #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */ |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 27 | extern void *malloc(size_t size); |
| 28 | extern void free(void *ptr); |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 29 | #endif |
DRC | 6399d0a | 2019-04-23 14:10:04 -0500 | [diff] [blame] | 30 | void jpeg_mem_dest_tj(j_compress_ptr cinfo, unsigned char **outbuffer, |
| 31 | unsigned long *outsize, boolean alloc); |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 32 | |
| 33 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 34 | #define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */ |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 35 | |
| 36 | |
| 37 | /* Expanded data destination object for memory output */ |
| 38 | |
| 39 | typedef struct { |
| 40 | struct jpeg_destination_mgr pub; /* public fields */ |
| 41 | |
DRC | bd49803 | 2016-02-19 08:53:33 -0600 | [diff] [blame] | 42 | unsigned char **outbuffer; /* target buffer */ |
| 43 | unsigned long *outsize; |
| 44 | unsigned char *newbuffer; /* newly allocated buffer */ |
| 45 | JOCTET *buffer; /* start of buffer */ |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 46 | size_t bufsize; |
| 47 | boolean alloc; |
| 48 | } my_mem_destination_mgr; |
| 49 | |
DRC | bd49803 | 2016-02-19 08:53:33 -0600 | [diff] [blame] | 50 | typedef my_mem_destination_mgr *my_mem_dest_ptr; |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 51 | |
| 52 | |
| 53 | /* |
| 54 | * Initialize destination --- called by jpeg_start_compress |
| 55 | * before any data is actually written. |
| 56 | */ |
| 57 | |
| 58 | METHODDEF(void) |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 59 | init_mem_destination(j_compress_ptr cinfo) |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 60 | { |
| 61 | /* no work necessary here */ |
| 62 | } |
| 63 | |
| 64 | |
| 65 | /* |
| 66 | * Empty the output buffer --- called whenever buffer fills up. |
| 67 | * |
| 68 | * In typical applications, this should write the entire output buffer |
| 69 | * (ignoring the current state of next_output_byte & free_in_buffer), |
| 70 | * reset the pointer & count to the start of the buffer, and return TRUE |
| 71 | * indicating that the buffer has been dumped. |
| 72 | * |
| 73 | * In applications that need to be able to suspend compression due to output |
| 74 | * overrun, a FALSE return indicates that the buffer cannot be emptied now. |
| 75 | * In this situation, the compressor will return to its caller (possibly with |
| 76 | * an indication that it has not accepted all the supplied scanlines). The |
| 77 | * application should resume compression after it has made more room in the |
| 78 | * output buffer. Note that there are substantial restrictions on the use of |
| 79 | * suspension --- see the documentation. |
| 80 | * |
| 81 | * When suspending, the compressor will back up to a convenient restart point |
| 82 | * (typically the start of the current MCU). next_output_byte & free_in_buffer |
| 83 | * indicate where the restart point will be if the current call returns FALSE. |
| 84 | * Data beyond this point will be regenerated after resumption, so do not |
| 85 | * write it out when emptying the buffer externally. |
| 86 | */ |
| 87 | |
| 88 | METHODDEF(boolean) |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 89 | empty_mem_output_buffer(j_compress_ptr cinfo) |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 90 | { |
| 91 | size_t nextsize; |
DRC | bd49803 | 2016-02-19 08:53:33 -0600 | [diff] [blame] | 92 | JOCTET *nextbuffer; |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 93 | my_mem_dest_ptr dest = (my_mem_dest_ptr)cinfo->dest; |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 94 | |
| 95 | if (!dest->alloc) ERREXIT(cinfo, JERR_BUFFER_SIZE); |
| 96 | |
| 97 | /* Try to allocate new buffer with double size */ |
| 98 | nextsize = dest->bufsize * 2; |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 99 | nextbuffer = (JOCTET *)malloc(nextsize); |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 100 | |
| 101 | if (nextbuffer == NULL) |
| 102 | ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10); |
| 103 | |
| 104 | MEMCOPY(nextbuffer, dest->buffer, dest->bufsize); |
| 105 | |
| 106 | if (dest->newbuffer != NULL) |
| 107 | free(dest->newbuffer); |
| 108 | |
| 109 | dest->newbuffer = nextbuffer; |
| 110 | |
| 111 | dest->pub.next_output_byte = nextbuffer + dest->bufsize; |
| 112 | dest->pub.free_in_buffer = dest->bufsize; |
| 113 | |
| 114 | dest->buffer = nextbuffer; |
| 115 | dest->bufsize = nextsize; |
| 116 | |
| 117 | return TRUE; |
| 118 | } |
| 119 | |
| 120 | |
| 121 | /* |
| 122 | * Terminate destination --- called by jpeg_finish_compress |
| 123 | * after all data has been written. Usually needs to flush buffer. |
| 124 | * |
| 125 | * NB: *not* called by jpeg_abort or jpeg_destroy; surrounding |
| 126 | * application must deal with any cleanup that should happen even |
| 127 | * for error exit. |
| 128 | */ |
| 129 | |
| 130 | METHODDEF(void) |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 131 | term_mem_destination(j_compress_ptr cinfo) |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 132 | { |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 133 | my_mem_dest_ptr dest = (my_mem_dest_ptr)cinfo->dest; |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 134 | |
DRC | 9d9d8fe | 2017-11-17 18:15:42 -0600 | [diff] [blame] | 135 | if (dest->alloc) *dest->outbuffer = dest->buffer; |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 136 | *dest->outsize = (unsigned long)(dest->bufsize - dest->pub.free_in_buffer); |
| 137 | } |
| 138 | |
| 139 | |
| 140 | /* |
| 141 | * Prepare for output to a memory buffer. |
| 142 | * The caller may supply an own initial buffer with appropriate size. |
| 143 | * Otherwise, or when the actual data output exceeds the given size, |
| 144 | * the library adapts the buffer size as necessary. |
| 145 | * The standard library functions malloc/free are used for allocating |
| 146 | * larger memory, so the buffer is available to the application after |
| 147 | * finishing compression, and then the application is responsible for |
| 148 | * freeing the requested memory. |
| 149 | */ |
| 150 | |
| 151 | GLOBAL(void) |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 152 | jpeg_mem_dest_tj(j_compress_ptr cinfo, unsigned char **outbuffer, |
| 153 | unsigned long *outsize, boolean alloc) |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 154 | { |
DRC | fe80ec2 | 2014-08-21 15:51:47 +0000 | [diff] [blame] | 155 | boolean reused = FALSE; |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 156 | my_mem_dest_ptr dest; |
| 157 | |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 158 | if (outbuffer == NULL || outsize == NULL) /* sanity check */ |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 159 | ERREXIT(cinfo, JERR_BUFFER_SIZE); |
| 160 | |
| 161 | /* The destination object is made permanent so that multiple JPEG images |
| 162 | * can be written to the same buffer without re-executing jpeg_mem_dest. |
| 163 | */ |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 164 | if (cinfo->dest == NULL) { /* first time for this JPEG object? */ |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 165 | cinfo->dest = (struct jpeg_destination_mgr *) |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 166 | (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_PERMANENT, |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame] | 167 | sizeof(my_mem_destination_mgr)); |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 168 | dest = (my_mem_dest_ptr)cinfo->dest; |
DRC | 90215cc | 2011-05-24 15:15:15 +0000 | [diff] [blame] | 169 | dest->newbuffer = NULL; |
DRC | cce13c7 | 2014-08-21 22:15:19 +0000 | [diff] [blame] | 170 | dest->buffer = NULL; |
DRC | 68cf83d | 2016-05-10 21:04:02 -0500 | [diff] [blame] | 171 | } else if (cinfo->dest->init_destination != init_mem_destination) { |
| 172 | /* It is unsafe to reuse the existing destination manager unless it was |
| 173 | * created by this function. |
| 174 | */ |
| 175 | ERREXIT(cinfo, JERR_BUFFER_SIZE); |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 176 | } |
| 177 | |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 178 | dest = (my_mem_dest_ptr)cinfo->dest; |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 179 | dest->pub.init_destination = init_mem_destination; |
| 180 | dest->pub.empty_output_buffer = empty_mem_output_buffer; |
| 181 | dest->pub.term_destination = term_mem_destination; |
DRC | 88b90bd | 2014-08-21 22:16:25 +0000 | [diff] [blame] | 182 | if (dest->buffer == *outbuffer && *outbuffer != NULL && alloc) |
DRC | fe80ec2 | 2014-08-21 15:51:47 +0000 | [diff] [blame] | 183 | reused = TRUE; |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 184 | dest->outbuffer = outbuffer; |
| 185 | dest->outsize = outsize; |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 186 | dest->alloc = alloc; |
| 187 | |
| 188 | if (*outbuffer == NULL || *outsize == 0) { |
| 189 | if (alloc) { |
| 190 | /* Allocate initial buffer */ |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 191 | dest->newbuffer = *outbuffer = (unsigned char *)malloc(OUTPUT_BUF_SIZE); |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 192 | if (dest->newbuffer == NULL) |
| 193 | ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10); |
| 194 | *outsize = OUTPUT_BUF_SIZE; |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 195 | } else |
| 196 | ERREXIT(cinfo, JERR_BUFFER_SIZE); |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | dest->pub.next_output_byte = dest->buffer = *outbuffer; |
DRC | fe80ec2 | 2014-08-21 15:51:47 +0000 | [diff] [blame] | 200 | if (!reused) |
| 201 | dest->bufsize = *outsize; |
| 202 | dest->pub.free_in_buffer = dest->bufsize; |
DRC | 9b28def | 2011-05-21 14:37:15 +0000 | [diff] [blame] | 203 | } |