LCOV - app.info - media/libjpeg/jcmarker.c

LCOV - code coverage report
| Current view: | directory - media/libjpeg - jcmarker.c (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 221 | 146 | 66.1 %
| Date: | 2012-06-02 | Functions: | 19 | 13 | 68.4 %

           1                 : /*
           2                 :  * jcmarker.c
           3                 :  *
           4                 :  * Copyright (C) 1991-1998, Thomas G. Lane.
           5                 :  * Copyright (C) 2010, D. R. Commander.
           6                 :  * This file is part of the Independent JPEG Group's software.
           7                 :  * For conditions of distribution and use, see the accompanying README file.
           8                 :  *
           9                 :  * This file contains routines to write JPEG datastream markers.
          10                 :  */
          11                 :
          12                 : #define JPEG_INTERNALS
          13                 : #include "jinclude.h"
          14                 : #include "jpeglib.h"
          15                 : #include "jpegcomp.h"
          16                 :
          17                 :
          18                 : typedef enum {                  /* JPEG marker codes */
          19                 :   M_SOF0  = 0xc0,
          20                 :   M_SOF1  = 0xc1,
          21                 :   M_SOF2  = 0xc2,
          22                 :   M_SOF3  = 0xc3,
          23                 :
          24                 :   M_SOF5  = 0xc5,
          25                 :   M_SOF6  = 0xc6,
          26                 :   M_SOF7  = 0xc7,
          27                 :
          28                 :   M_JPG   = 0xc8,
          29                 :   M_SOF9  = 0xc9,
          30                 :   M_SOF10 = 0xca,
          31                 :   M_SOF11 = 0xcb,
          32                 :
          33                 :   M_SOF13 = 0xcd,
          34                 :   M_SOF14 = 0xce,
          35                 :   M_SOF15 = 0xcf,
          36                 :
          37                 :   M_DHT   = 0xc4,
          38                 :
          39                 :   M_DAC   = 0xcc,
          40                 :
          41                 :   M_RST0  = 0xd0,
          42                 :   M_RST1  = 0xd1,
          43                 :   M_RST2  = 0xd2,
          44                 :   M_RST3  = 0xd3,
          45                 :   M_RST4  = 0xd4,
          46                 :   M_RST5  = 0xd5,
          47                 :   M_RST6  = 0xd6,
          48                 :   M_RST7  = 0xd7,
          49                 :
          50                 :   M_SOI   = 0xd8,
          51                 :   M_EOI   = 0xd9,
          52                 :   M_SOS   = 0xda,
          53                 :   M_DQT   = 0xdb,
          54                 :   M_DNL   = 0xdc,
          55                 :   M_DRI   = 0xdd,
          56                 :   M_DHP   = 0xde,
          57                 :   M_EXP   = 0xdf,
          58                 :
          59                 :   M_APP0  = 0xe0,
          60                 :   M_APP1  = 0xe1,
          61                 :   M_APP2  = 0xe2,
          62                 :   M_APP3  = 0xe3,
          63                 :   M_APP4  = 0xe4,
          64                 :   M_APP5  = 0xe5,
          65                 :   M_APP6  = 0xe6,
          66                 :   M_APP7  = 0xe7,
          67                 :   M_APP8  = 0xe8,
          68                 :   M_APP9  = 0xe9,
          69                 :   M_APP10 = 0xea,
          70                 :   M_APP11 = 0xeb,
          71                 :   M_APP12 = 0xec,
          72                 :   M_APP13 = 0xed,
          73                 :   M_APP14 = 0xee,
          74                 :   M_APP15 = 0xef,
          75                 :
          76                 :   M_JPG0  = 0xf0,
          77                 :   M_JPG13 = 0xfd,
          78                 :   M_COM   = 0xfe,
          79                 :
          80                 :   M_TEM   = 0x01,
          81                 :
          82                 :   M_ERROR = 0x100
          83                 : } JPEG_MARKER;
          84                 :
          85                 :
          86                 : /* Private state */
          87                 :
          88                 : typedef struct {
          89                 :   struct jpeg_marker_writer pub; /* public fields */
          90                 :
          91                 :   unsigned int last_restart_interval; /* last DRI value emitted; 0 after SOI */
          92                 : } my_marker_writer;
          93                 :
          94                 : typedef my_marker_writer * my_marker_ptr;
          95                 :
          96                 :
          97                 : /*
          98                 :  * Basic output routines.
          99                 :  *
         100                 :  * Note that we do not support suspension while writing a marker.
         101                 :  * Therefore, an application using suspension must ensure that there is
         102                 :  * enough buffer space for the initial markers (typ. 600-700 bytes) before
         103                 :  * calling jpeg_start_compress, and enough space to write the trailing EOI
         104                 :  * (a few bytes) before calling jpeg_finish_compress.  Multipass compression
         105                 :  * modes are not supported at all with suspension, so those two are the only
         106                 :  * points where markers will be written.
         107                 :  */
         108                 :
         109                 : LOCAL(void)
         110            1875 : emit_byte (j_compress_ptr cinfo, int val)
         111                 : /* Emit a byte */
         112                 : {
         113            1875 :   struct jpeg_destination_mgr * dest = cinfo->dest;
         114                 :
         115            1875 :   *(dest->next_output_byte)++ = (JOCTET) val;
         116            1875 :   if (--dest->free_in_buffer == 0) {
         117               0 :     if (! (*dest->empty_output_buffer) (cinfo))
         118               0 :       ERREXIT(cinfo, JERR_CANT_SUSPEND);
         119                 :   }
         120            1875 : }
         121                 :
         122                 :
         123                 : LOCAL(void)
         124              33 : emit_marker (j_compress_ptr cinfo, JPEG_MARKER mark)
         125                 : /* Emit a marker code */
         126                 : {
         127              33 :   emit_byte(cinfo, 0xFF);
         128              33 :   emit_byte(cinfo, (int) mark);
         129              33 : }
         130                 :
         131                 :
         132                 : LOCAL(void)
         133              39 : emit_2bytes (j_compress_ptr cinfo, int value)
         134                 : /* Emit a 2-byte integer; these are always MSB first in JPEG files */
         135                 : {
         136              39 :   emit_byte(cinfo, (value >> 8) & 0xFF);
         137              39 :   emit_byte(cinfo, value & 0xFF);
         138              39 : }
         139                 :
         140                 :
         141                 : /*
         142                 :  * Routines to write specific marker types.
         143                 :  */
         144                 :
         145                 : LOCAL(int)
         146               9 : emit_dqt (j_compress_ptr cinfo, int index)
         147                 : /* Emit a DQT marker */
         148                 : /* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */
         149                 : {
         150               9 :   JQUANT_TBL * qtbl = cinfo->quant_tbl_ptrs[index];
         151                 :   int prec;
         152                 :   int i;
         153                 :
         154               9 :   if (qtbl == NULL)
         155               0 :     ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);
         156                 :
         157               9 :   prec = 0;
         158             585 :   for (i = 0; i < DCTSIZE2; i++) {
         159             576 :     if (qtbl->quantval[i] > 255)
         160               0 :       prec = 1;
         161                 :   }
         162                 :
         163               9 :   if (! qtbl->sent_table) {
         164               6 :     emit_marker(cinfo, M_DQT);
         165                 :
         166               6 :     emit_2bytes(cinfo, prec ? DCTSIZE2*2 + 1 + 2 : DCTSIZE2 + 1 + 2);
         167                 :
         168               6 :     emit_byte(cinfo, index + (prec<<4));
         169                 :
         170             390 :     for (i = 0; i < DCTSIZE2; i++) {
         171                 :       /* The table entries must be emitted in zigzag order. */
         172             384 :       unsigned int qval = qtbl->quantval[jpeg_natural_order[i]];
         173             384 :       if (prec)
         174               0 :         emit_byte(cinfo, (int) (qval >> 8));
         175             384 :       emit_byte(cinfo, (int) (qval & 0xFF));
         176                 :     }
         177                 :
         178               6 :     qtbl->sent_table = TRUE;
         179                 :   }
         180                 :
         181               9 :   return prec;
         182                 : }
         183                 :
         184                 :
         185                 : LOCAL(void)
         186              18 : emit_dht (j_compress_ptr cinfo, int index, boolean is_ac)
         187                 : /* Emit a DHT marker */
         188                 : {
         189                 :   JHUFF_TBL * htbl;
         190                 :   int length, i;
         191                 :
         192              18 :   if (is_ac) {
         193               9 :     htbl = cinfo->ac_huff_tbl_ptrs[index];
         194               9 :     index += 0x10;              /* output index has AC bit set */
         195                 :   } else {
         196               9 :     htbl = cinfo->dc_huff_tbl_ptrs[index];
         197                 :   }
         198                 :
         199              18 :   if (htbl == NULL)
         200               0 :     ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, index);
         201                 :
         202              18 :   if (! htbl->sent_table) {
         203              12 :     emit_marker(cinfo, M_DHT);
         204                 :
         205              12 :     length = 0;
         206             204 :     for (i = 1; i <= 16; i++)
         207             192 :       length += htbl->bits[i];
         208                 :
         209              12 :     emit_2bytes(cinfo, length + 2 + 1 + 16);
         210              12 :     emit_byte(cinfo, index);
         211                 :
         212             204 :     for (i = 1; i <= 16; i++)
         213             192 :       emit_byte(cinfo, htbl->bits[i]);
         214                 :
         215            1056 :     for (i = 0; i < length; i++)
         216            1044 :       emit_byte(cinfo, htbl->huffval[i]);
         217                 :
         218              12 :     htbl->sent_table = TRUE;
         219                 :   }
         220              18 : }
         221                 :
         222                 :
         223                 : LOCAL(void)
         224               0 : emit_dac (j_compress_ptr cinfo)
         225                 : /* Emit a DAC marker */
         226                 : /* Since the useful info is so small, we want to emit all the tables in */
         227                 : /* one DAC marker.  Therefore this routine does its own scan of the table. */
         228                 : {
         229                 : #ifdef C_ARITH_CODING_SUPPORTED
         230                 :   char dc_in_use[NUM_ARITH_TBLS];
         231                 :   char ac_in_use[NUM_ARITH_TBLS];
         232                 :   int length, i;
         233                 :   jpeg_component_info *compptr;
         234                 :
         235                 :   for (i = 0; i < NUM_ARITH_TBLS; i++)
         236                 :     dc_in_use[i] = ac_in_use[i] = 0;
         237                 :
         238                 :   for (i = 0; i < cinfo->comps_in_scan; i++) {
         239                 :     compptr = cinfo->cur_comp_info[i];
         240                 :     dc_in_use[compptr->dc_tbl_no] = 1;
         241                 :     ac_in_use[compptr->ac_tbl_no] = 1;
         242                 :   }
         243                 :
         244                 :   length = 0;
         245                 :   for (i = 0; i < NUM_ARITH_TBLS; i++)
         246                 :     length += dc_in_use[i] + ac_in_use[i];
         247                 :
         248                 :   emit_marker(cinfo, M_DAC);
         249                 :
         250                 :   emit_2bytes(cinfo, length*2 + 2);
         251                 :
         252                 :   for (i = 0; i < NUM_ARITH_TBLS; i++) {
         253                 :     if (dc_in_use[i]) {
         254                 :       emit_byte(cinfo, i);
         255                 :       emit_byte(cinfo, cinfo->arith_dc_L[i] + (cinfo->arith_dc_U[i]<<4));
         256                 :     }
         257                 :     if (ac_in_use[i]) {
         258                 :       emit_byte(cinfo, i + 0x10);
         259                 :       emit_byte(cinfo, cinfo->arith_ac_K[i]);
         260                 :     }
         261                 :   }
         262                 : #endif /* C_ARITH_CODING_SUPPORTED */
         263               0 : }
         264                 :
         265                 :
         266                 : LOCAL(void)
         267               0 : emit_dri (j_compress_ptr cinfo)
         268                 : /* Emit a DRI marker */
         269                 : {
         270               0 :   emit_marker(cinfo, M_DRI);
         271                 :
         272               0 :   emit_2bytes(cinfo, 4);        /* fixed length */
         273                 :
         274               0 :   emit_2bytes(cinfo, (int) cinfo->restart_interval);
         275               0 : }
         276                 :
         277                 :
         278                 : LOCAL(void)
         279               3 : emit_sof (j_compress_ptr cinfo, JPEG_MARKER code)
         280                 : /* Emit a SOF marker */
         281                 : {
         282                 :   int ci;
         283                 :   jpeg_component_info *compptr;
         284                 :
         285               3 :   emit_marker(cinfo, code);
         286                 :
         287               3 :   emit_2bytes(cinfo, 3 * cinfo->num_components + 2 + 5 + 1); /* length */
         288                 :
         289                 :   /* Make sure image isn't bigger than SOF field can handle */
         290               6 :   if ((long) cinfo->_jpeg_height > 65535L ||
         291               3 :       (long) cinfo->_jpeg_width > 65535L)
         292               0 :     ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535);
         293                 :
         294               3 :   emit_byte(cinfo, cinfo->data_precision);
         295               3 :   emit_2bytes(cinfo, (int) cinfo->_jpeg_height);
         296               3 :   emit_2bytes(cinfo, (int) cinfo->_jpeg_width);
         297                 :
         298               3 :   emit_byte(cinfo, cinfo->num_components);
         299                 :
         300              15 :   for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
         301               9 :        ci++, compptr++) {
         302               9 :     emit_byte(cinfo, compptr->component_id);
         303               9 :     emit_byte(cinfo, (compptr->h_samp_factor << 4) + compptr->v_samp_factor);
         304               9 :     emit_byte(cinfo, compptr->quant_tbl_no);
         305                 :   }
         306               3 : }
         307                 :
         308                 :
         309                 : LOCAL(void)
         310               3 : emit_sos (j_compress_ptr cinfo)
         311                 : /* Emit a SOS marker */
         312                 : {
         313                 :   int i, td, ta;
         314                 :   jpeg_component_info *compptr;
         315                 :
         316               3 :   emit_marker(cinfo, M_SOS);
         317                 :
         318               3 :   emit_2bytes(cinfo, 2 * cinfo->comps_in_scan + 2 + 1 + 3); /* length */
         319                 :
         320               3 :   emit_byte(cinfo, cinfo->comps_in_scan);
         321                 :
         322              12 :   for (i = 0; i < cinfo->comps_in_scan; i++) {
         323               9 :     compptr = cinfo->cur_comp_info[i];
         324               9 :     emit_byte(cinfo, compptr->component_id);
         325               9 :     td = compptr->dc_tbl_no;
         326               9 :     ta = compptr->ac_tbl_no;
         327               9 :     if (cinfo->progressive_mode) {
         328                 :       /* Progressive mode: only DC or only AC tables are used in one scan;
         329                 :        * furthermore, Huffman coding of DC refinement uses no table at all.
         330                 :        * We emit 0 for unused field(s); this is recommended by the P&M text
         331                 :        * but does not seem to be specified in the standard.
         332                 :        */
         333               0 :       if (cinfo->Ss == 0) {
         334               0 :         ta = 0;                 /* DC scan */
         335               0 :         if (cinfo->Ah != 0 && !cinfo->arith_code)
         336               0 :           td = 0;               /* no DC table either */
         337                 :       } else {
         338               0 :         td = 0;                 /* AC scan */
         339                 :       }
         340                 :     }
         341               9 :     emit_byte(cinfo, (td << 4) + ta);
         342                 :   }
         343                 :
         344               3 :   emit_byte(cinfo, cinfo->Ss);
         345               3 :   emit_byte(cinfo, cinfo->Se);
         346               3 :   emit_byte(cinfo, (cinfo->Ah << 4) + cinfo->Al);
         347               3 : }
         348                 :
         349                 :
         350                 : LOCAL(void)
         351               3 : emit_jfif_app0 (j_compress_ptr cinfo)
         352                 : /* Emit a JFIF-compliant APP0 marker */
         353                 : {
         354                 :   /*
         355                 :    * Length of APP0 block       (2 bytes)
         356                 :    * Block ID                   (4 bytes - ASCII "JFIF")
         357                 :    * Zero byte                  (1 byte to terminate the ID string)
         358                 :    * Version Major, Minor       (2 bytes - major first)
         359                 :    * Units                      (1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm)
         360                 :    * Xdpu                       (2 bytes - dots per unit horizontal)
         361                 :    * Ydpu                       (2 bytes - dots per unit vertical)
         362                 :    * Thumbnail X size           (1 byte)
         363                 :    * Thumbnail Y size           (1 byte)
         364                 :    */
         365                 :
         366               3 :   emit_marker(cinfo, M_APP0);
         367                 :
         368               3 :   emit_2bytes(cinfo, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1); /* length */
         369                 :
         370               3 :   emit_byte(cinfo, 0x4A);       /* Identifier: ASCII "JFIF" */
         371               3 :   emit_byte(cinfo, 0x46);
         372               3 :   emit_byte(cinfo, 0x49);
         373               3 :   emit_byte(cinfo, 0x46);
         374               3 :   emit_byte(cinfo, 0);
         375               3 :   emit_byte(cinfo, cinfo->JFIF_major_version); /* Version fields */
         376               3 :   emit_byte(cinfo, cinfo->JFIF_minor_version);
         377               3 :   emit_byte(cinfo, cinfo->density_unit); /* Pixel size information */
         378               3 :   emit_2bytes(cinfo, (int) cinfo->X_density);
         379               3 :   emit_2bytes(cinfo, (int) cinfo->Y_density);
         380               3 :   emit_byte(cinfo, 0);          /* No thumbnail image */
         381               3 :   emit_byte(cinfo, 0);
         382               3 : }
         383                 :
         384                 :
         385                 : LOCAL(void)
         386               0 : emit_adobe_app14 (j_compress_ptr cinfo)
         387                 : /* Emit an Adobe APP14 marker */
         388                 : {
         389                 :   /*
         390                 :    * Length of APP14 block      (2 bytes)
         391                 :    * Block ID                   (5 bytes - ASCII "Adobe")
         392                 :    * Version Number             (2 bytes - currently 100)
         393                 :    * Flags0                     (2 bytes - currently 0)
         394                 :    * Flags1                     (2 bytes - currently 0)
         395                 :    * Color transform            (1 byte)
         396                 :    *
         397                 :    * Although Adobe TN 5116 mentions Version = 101, all the Adobe files
         398                 :    * now in circulation seem to use Version = 100, so that's what we write.
         399                 :    *
         400                 :    * We write the color transform byte as 1 if the JPEG color space is
         401                 :    * YCbCr, 2 if it's YCCK, 0 otherwise.  Adobe's definition has to do with
         402                 :    * whether the encoder performed a transformation, which is pretty useless.
         403                 :    */
         404                 :
         405               0 :   emit_marker(cinfo, M_APP14);
         406                 :
         407               0 :   emit_2bytes(cinfo, 2 + 5 + 2 + 2 + 2 + 1); /* length */
         408                 :
         409               0 :   emit_byte(cinfo, 0x41);       /* Identifier: ASCII "Adobe" */
         410               0 :   emit_byte(cinfo, 0x64);
         411               0 :   emit_byte(cinfo, 0x6F);
         412               0 :   emit_byte(cinfo, 0x62);
         413               0 :   emit_byte(cinfo, 0x65);
         414               0 :   emit_2bytes(cinfo, 100);      /* Version */
         415               0 :   emit_2bytes(cinfo, 0);        /* Flags0 */
         416               0 :   emit_2bytes(cinfo, 0);        /* Flags1 */
         417               0 :   switch (cinfo->jpeg_color_space) {
         418                 :   case JCS_YCbCr:
         419               0 :     emit_byte(cinfo, 1);        /* Color transform = 1 */
         420               0 :     break;
         421                 :   case JCS_YCCK:
         422               0 :     emit_byte(cinfo, 2);        /* Color transform = 2 */
         423               0 :     break;
         424                 :   default:
         425               0 :     emit_byte(cinfo, 0);        /* Color transform = 0 */
         426               0 :     break;
         427                 :   }
         428               0 : }
         429                 :
         430                 :
         431                 : /*
         432                 :  * These routines allow writing an arbitrary marker with parameters.
         433                 :  * The only intended use is to emit COM or APPn markers after calling
         434                 :  * write_file_header and before calling write_frame_header.
         435                 :  * Other uses are not guaranteed to produce desirable results.
         436                 :  * Counting the parameter bytes properly is the caller's responsibility.
         437                 :  */
         438                 :
         439                 : METHODDEF(void)
         440               0 : write_marker_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
         441                 : /* Emit an arbitrary marker header */
         442                 : {
         443               0 :   if (datalen > (unsigned int) 65533)                /* safety check */
         444               0 :     ERREXIT(cinfo, JERR_BAD_LENGTH);
         445                 :
         446               0 :   emit_marker(cinfo, (JPEG_MARKER) marker);
         447                 :
         448               0 :   emit_2bytes(cinfo, (int) (datalen + 2));      /* total length */
         449               0 : }
         450                 :
         451                 : METHODDEF(void)
         452               0 : write_marker_byte (j_compress_ptr cinfo, int val)
         453                 : /* Emit one byte of marker parameters following write_marker_header */
         454                 : {
         455               0 :   emit_byte(cinfo, val);
         456               0 : }
         457                 :
         458                 :
         459                 : /*
         460                 :  * Write datastream header.
         461                 :  * This consists of an SOI and optional APPn markers.
         462                 :  * We recommend use of the JFIF marker, but not the Adobe marker,
         463                 :  * when using YCbCr or grayscale data.  The JFIF marker should NOT
         464                 :  * be used for any other JPEG colorspace.  The Adobe marker is helpful
         465                 :  * to distinguish RGB, CMYK, and YCCK colorspaces.
         466                 :  * Note that an application can write additional header markers after
         467                 :  * jpeg_start_compress returns.
         468                 :  */
         469                 :
         470                 : METHODDEF(void)
         471               3 : write_file_header (j_compress_ptr cinfo)
         472                 : {
         473               3 :   my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
         474                 :
         475               3 :   emit_marker(cinfo, M_SOI);    /* first the SOI */
         476                 :
         477                 :   /* SOI is defined to reset restart interval to 0 */
         478               3 :   marker->last_restart_interval = 0;
         479                 :
         480               3 :   if (cinfo->write_JFIF_header)      /* next an optional JFIF APP0 */
         481               3 :     emit_jfif_app0(cinfo);
         482               3 :   if (cinfo->write_Adobe_marker) /* next an optional Adobe APP14 */
         483               0 :     emit_adobe_app14(cinfo);
         484               3 : }
         485                 :
         486                 :
         487                 : /*
         488                 :  * Write frame header.
         489                 :  * This consists of DQT and SOFn markers.
         490                 :  * Note that we do not emit the SOF until we have emitted the DQT(s).
         491                 :  * This avoids compatibility problems with incorrect implementations that
         492                 :  * try to error-check the quant table numbers as soon as they see the SOF.
         493                 :  */
         494                 :
         495                 : METHODDEF(void)
         496               3 : write_frame_header (j_compress_ptr cinfo)
         497                 : {
         498                 :   int ci, prec;
         499                 :   boolean is_baseline;
         500                 :   jpeg_component_info *compptr;
         501                 :
         502                 :   /* Emit DQT for each quantization table.
         503                 :    * Note that emit_dqt() suppresses any duplicate tables.
         504                 :    */
         505               3 :   prec = 0;
         506              15 :   for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
         507               9 :        ci++, compptr++) {
         508               9 :     prec += emit_dqt(cinfo, compptr->quant_tbl_no);
         509                 :   }
         510                 :   /* now prec is nonzero iff there are any 16-bit quant tables. */
         511                 :
         512                 :   /* Check for a non-baseline specification.
         513                 :    * Note we assume that Huffman table numbers won't be changed later.
         514                 :    */
         515               6 :   if (cinfo->arith_code || cinfo->progressive_mode ||
         516               3 :       cinfo->data_precision != 8) {
         517               0 :     is_baseline = FALSE;
         518                 :   } else {
         519               3 :     is_baseline = TRUE;
         520              15 :     for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
         521               9 :          ci++, compptr++) {
         522               9 :       if (compptr->dc_tbl_no > 1 || compptr->ac_tbl_no > 1)
         523               0 :         is_baseline = FALSE;
         524                 :     }
         525               3 :     if (prec && is_baseline) {
         526               0 :       is_baseline = FALSE;
         527                 :       /* If it's baseline except for quantizer size, warn the user */
         528               0 :       TRACEMS(cinfo, 0, JTRC_16BIT_TABLES);
         529                 :     }
         530                 :   }
         531                 :
         532                 :   /* Emit the proper SOF marker */
         533               3 :   if (cinfo->arith_code) {
         534               0 :     emit_sof(cinfo, M_SOF9);    /* SOF code for arithmetic coding */
         535                 :   } else {
         536               3 :     if (cinfo->progressive_mode)
         537               0 :       emit_sof(cinfo, M_SOF2);  /* SOF code for progressive Huffman */
         538               3 :     else if (is_baseline)
         539               3 :       emit_sof(cinfo, M_SOF0);  /* SOF code for baseline implementation */
         540                 :     else
         541               0 :       emit_sof(cinfo, M_SOF1);  /* SOF code for non-baseline Huffman file */
         542                 :   }
         543               3 : }
         544                 :
         545                 :
         546                 : /*
         547                 :  * Write scan header.
         548                 :  * This consists of DHT or DAC markers, optional DRI, and SOS.
         549                 :  * Compressed data will be written following the SOS.
         550                 :  */
         551                 :
         552                 : METHODDEF(void)
         553               3 : write_scan_header (j_compress_ptr cinfo)
         554                 : {
         555               3 :   my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
         556                 :   int i;
         557                 :   jpeg_component_info *compptr;
         558                 :
         559               3 :   if (cinfo->arith_code) {
         560                 :     /* Emit arith conditioning info.  We may have some duplication
         561                 :      * if the file has multiple scans, but it's so small it's hardly
         562                 :      * worth worrying about.
         563                 :      */
         564               0 :     emit_dac(cinfo);
         565                 :   } else {
         566                 :     /* Emit Huffman tables.
         567                 :      * Note that emit_dht() suppresses any duplicate tables.
         568                 :      */
         569              12 :     for (i = 0; i < cinfo->comps_in_scan; i++) {
         570               9 :       compptr = cinfo->cur_comp_info[i];
         571               9 :       if (cinfo->progressive_mode) {
         572                 :         /* Progressive mode: only DC or only AC tables are used in one scan */
         573               0 :         if (cinfo->Ss == 0) {
         574               0 :           if (cinfo->Ah == 0)        /* DC needs no table for refinement scan */
         575               0 :             emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
         576                 :         } else {
         577               0 :           emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
         578                 :         }
         579                 :       } else {
         580                 :         /* Sequential mode: need both DC and AC tables */
         581               9 :         emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
         582               9 :         emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
         583                 :       }
         584                 :     }
         585                 :   }
         586                 :
         587                 :   /* Emit DRI if required --- note that DRI value could change for each scan.
         588                 :    * We avoid wasting space with unnecessary DRIs, however.
         589                 :    */
         590               3 :   if (cinfo->restart_interval != marker->last_restart_interval) {
         591               0 :     emit_dri(cinfo);
         592               0 :     marker->last_restart_interval = cinfo->restart_interval;
         593                 :   }
         594                 :
         595               3 :   emit_sos(cinfo);
         596               3 : }
         597                 :
         598                 :
         599                 : /*
         600                 :  * Write datastream trailer.
         601                 :  */
         602                 :
         603                 : METHODDEF(void)
         604               3 : write_file_trailer (j_compress_ptr cinfo)
         605                 : {
         606               3 :   emit_marker(cinfo, M_EOI);
         607               3 : }
         608                 :
         609                 :
         610                 : /*
         611                 :  * Write an abbreviated table-specification datastream.
         612                 :  * This consists of SOI, DQT and DHT tables, and EOI.
         613                 :  * Any table that is defined and not marked sent_table = TRUE will be
         614                 :  * emitted.  Note that all tables will be marked sent_table = TRUE at exit.
         615                 :  */
         616                 :
         617                 : METHODDEF(void)
         618               0 : write_tables_only (j_compress_ptr cinfo)
         619                 : {
         620                 :   int i;
         621                 :
         622               0 :   emit_marker(cinfo, M_SOI);
         623                 :
         624               0 :   for (i = 0; i < NUM_QUANT_TBLS; i++) {
         625               0 :     if (cinfo->quant_tbl_ptrs[i] != NULL)
         626               0 :       (void) emit_dqt(cinfo, i);
         627                 :   }
         628                 :
         629               0 :   if (! cinfo->arith_code) {
         630               0 :     for (i = 0; i < NUM_HUFF_TBLS; i++) {
         631               0 :       if (cinfo->dc_huff_tbl_ptrs[i] != NULL)
         632               0 :         emit_dht(cinfo, i, FALSE);
         633               0 :       if (cinfo->ac_huff_tbl_ptrs[i] != NULL)
         634               0 :         emit_dht(cinfo, i, TRUE);
         635                 :     }
         636                 :   }
         637                 :
         638               0 :   emit_marker(cinfo, M_EOI);
         639               0 : }
         640                 :
         641                 :
         642                 : /*
         643                 :  * Initialize the marker writer module.
         644                 :  */
         645                 :
         646                 : GLOBAL(void)
         647               3 : jinit_marker_writer (j_compress_ptr cinfo)
         648                 : {
         649                 :   my_marker_ptr marker;
         650                 :
         651                 :   /* Create the subobject */
         652               3 :   marker = (my_marker_ptr)
         653               3 :     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
         654                 :                                 SIZEOF(my_marker_writer));
         655               3 :   cinfo->marker = (struct jpeg_marker_writer *) marker;
         656                 :   /* Initialize method pointers */
         657               3 :   marker->pub.write_file_header = write_file_header;
         658               3 :   marker->pub.write_frame_header = write_frame_header;
         659               3 :   marker->pub.write_scan_header = write_scan_header;
         660               3 :   marker->pub.write_file_trailer = write_file_trailer;
         661               3 :   marker->pub.write_tables_only = write_tables_only;
         662               3 :   marker->pub.write_marker_header = write_marker_header;
         663               3 :   marker->pub.write_marker_byte = write_marker_byte;
         664                 :   /* Initialize private state */
         665               3 :   marker->last_restart_interval = 0;
         666               3 : }

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