Bug Summary

File:jdk/src/java.desktop/share/native/libjavajpeg/jctrans.c
Warning:line 320, column 26
Dereference of undefined pointer value

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name jctrans.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -mthread-model posix -fno-delete-null-pointer-checks -mframe-pointer=all -relaxed-aliasing -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -I /home/daniel/Projects/java/jdk/build/linux-x86_64-server-fastdebug/support/modules_include/java.base -I /home/daniel/Projects/java/jdk/build/linux-x86_64-server-fastdebug/support/modules_include/java.base/linux -I /home/daniel/Projects/java/jdk/src/java.base/share/native/libjava -I /home/daniel/Projects/java/jdk/src/java.base/unix/native/libjava -I /home/daniel/Projects/java/jdk/src/hotspot/share/include -I /home/daniel/Projects/java/jdk/src/hotspot/os/posix/include -D LIBC=gnu -D _GNU_SOURCE -D _REENTRANT -D _LARGEFILE64_SOURCE -D LINUX -D DEBUG -D _LITTLE_ENDIAN -D ARCH="amd64" -D amd64 -D _LP64=1 -D SPLASHSCREEN -D PNG_NO_MMX_CODE -D PNG_ARM_NEON_OPT=0 -D PNG_ARM_NEON_IMPLEMENTATION=0 -D WITH_X11 -I /home/daniel/Projects/java/jdk/src/java.desktop/unix/native/libsplashscreen -I /home/daniel/Projects/java/jdk/src/java.desktop/share/native/libsplashscreen -I /home/daniel/Projects/java/jdk/src/java.desktop/unix/native/common/awt/systemscale -I /home/daniel/Projects/java/jdk/src/java.desktop/share/native/libjavajpeg -I /home/daniel/Projects/java/jdk/build/linux-x86_64-server-fastdebug/support/headers/java.desktop -I /home/daniel/Projects/java/jdk/src/java.desktop/share/native/libsplashscreen/giflib -I /home/daniel/Projects/java/jdk/src/java.desktop/share/native/libsplashscreen/libpng -I /home/daniel/Projects/java/jdk/src/java.base/unix/native/include -I /home/daniel/Projects/java/jdk/src/java.base/share/native/include -I /home/daniel/Projects/java/jdk/src/java.base/linux/native/libjava -I /home/daniel/Projects/java/jdk/src/java.base/unix/native/libjava -I /home/daniel/Projects/java/jdk/src/java.base/share/native/libjava -D _FORTIFY_SOURCE=2 -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wno-unused -Wno-sign-compare -Wno-type-limits -Wno-unused-result -Wno-maybe-uninitialized -Wno-shift-negative-value -Wno-implicit-fallthrough -Wno-unused-function -std=c99 -fdebug-compilation-dir /home/daniel/Projects/java/jdk/make -ferror-limit 19 -fmessage-length 0 -fvisibility hidden -stack-protector 1 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -faddrsig -o /home/daniel/Projects/java/scan/2021-12-21-193737-8510-1 -x c /home/daniel/Projects/java/jdk/src/java.desktop/share/native/libjavajpeg/jctrans.c
1/*
2 * reserved comment block
3 * DO NOT REMOVE OR ALTER!
4 */
5/*
6 * jctrans.c
7 *
8 * Copyright (C) 1995-1998, Thomas G. Lane.
9 * This file is part of the Independent JPEG Group's software.
10 * For conditions of distribution and use, see the accompanying README file.
11 *
12 * This file contains library routines for transcoding compression,
13 * that is, writing raw DCT coefficient arrays to an output JPEG file.
14 * The routines in jcapimin.c will also be needed by a transcoder.
15 */
16
17#define JPEG_INTERNALS
18#include "jinclude.h"
19#include "jpeglib.h"
20
21
22/* Forward declarations */
23LOCAL(void)static void transencode_master_selection
24 JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays))(j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays);
25LOCAL(void)static void transencode_coef_controller
26 JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays))(j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays);
27
28
29/*
30 * Compression initialization for writing raw-coefficient data.
31 * Before calling this, all parameters and a data destination must be set up.
32 * Call jpeg_finish_compress() to actually write the data.
33 *
34 * The number of passed virtual arrays must match cinfo->num_components.
35 * Note that the virtual arrays need not be filled or even realized at
36 * the time write_coefficients is called; indeed, if the virtual arrays
37 * were requested from this compression object's memory manager, they
38 * typically will be realized during this routine and filled afterwards.
39 */
40
41GLOBAL(void)void
42jpeg_write_coefficientsjWrtCoefs (j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays)
43{
44 if (cinfo->global_state != CSTATE_START100)
45 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state)((cinfo)->err->msg_code = (JERR_BAD_STATE), (cinfo)->
err->msg_parm.i[0] = (cinfo->global_state), (*(cinfo)->
err->error_exit) ((j_common_ptr) (cinfo)));
46 /* Mark all tables to be written */
47 jpeg_suppress_tablesjSuppressTables(cinfo, FALSE0);
48 /* (Re)initialize error mgr and destination modules */
49 (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
50 (*cinfo->dest->init_destination) (cinfo);
51 /* Perform master selection of active modules */
52 transencode_master_selection(cinfo, coef_arrays);
53 /* Wait for jpeg_finish_compress() call */
54 cinfo->next_scanline = 0; /* so jpeg_write_marker works */
55 cinfo->global_state = CSTATE_WRCOEFS103;
56}
57
58
59/*
60 * Initialize the compression object with default parameters,
61 * then copy from the source object all parameters needed for lossless
62 * transcoding. Parameters that can be varied without loss (such as
63 * scan script and Huffman optimization) are left in their default states.
64 */
65
66GLOBAL(void)void
67jpeg_copy_critical_parametersjCopyCrit (j_decompress_ptr srcinfo,
68 j_compress_ptr dstinfo)
69{
70 JQUANT_TBL ** qtblptr;
71 jpeg_component_info *incomp, *outcomp;
72 JQUANT_TBL *c_quant, *slot_quant;
73 int tblno, ci, coefi;
74
75 /* Safety check to ensure start_compress not called yet. */
76 if (dstinfo->global_state != CSTATE_START100)
77 ERREXIT1(dstinfo, JERR_BAD_STATE, dstinfo->global_state)((dstinfo)->err->msg_code = (JERR_BAD_STATE), (dstinfo)
->err->msg_parm.i[0] = (dstinfo->global_state), (*(dstinfo
)->err->error_exit) ((j_common_ptr) (dstinfo)));
78 /* Copy fundamental image dimensions */
79 dstinfo->image_width = srcinfo->image_width;
80 dstinfo->image_height = srcinfo->image_height;
81 dstinfo->input_components = srcinfo->num_components;
82 dstinfo->in_color_space = srcinfo->jpeg_color_space;
83 /* Initialize all parameters to default values */
84 jpeg_set_defaultsjSetDefaults(dstinfo);
85 /* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB.
86 * Fix it to get the right header markers for the image colorspace.
87 */
88 jpeg_set_colorspacejSetColorspace(dstinfo, srcinfo->jpeg_color_space);
89 dstinfo->data_precision = srcinfo->data_precision;
90 dstinfo->CCIR601_sampling = srcinfo->CCIR601_sampling;
91 /* Copy the source's quantization tables. */
92 for (tblno = 0; tblno < NUM_QUANT_TBLS4; tblno++) {
93 if (srcinfo->quant_tbl_ptrs[tblno] != NULL((void*)0)) {
94 qtblptr = & dstinfo->quant_tbl_ptrs[tblno];
95 if (*qtblptr == NULL((void*)0))
96 *qtblptr = jpeg_alloc_quant_tablejAlcQTable((j_common_ptr) dstinfo);
97 MEMCOPY((*qtblptr)->quantval,memcpy((void *)((*qtblptr)->quantval), (const void *)(srcinfo
->quant_tbl_ptrs[tblno]->quantval), (size_t)(((size_t) sizeof
((*qtblptr)->quantval))))
98 srcinfo->quant_tbl_ptrs[tblno]->quantval,memcpy((void *)((*qtblptr)->quantval), (const void *)(srcinfo
->quant_tbl_ptrs[tblno]->quantval), (size_t)(((size_t) sizeof
((*qtblptr)->quantval))))
99 SIZEOF((*qtblptr)->quantval))memcpy((void *)((*qtblptr)->quantval), (const void *)(srcinfo
->quant_tbl_ptrs[tblno]->quantval), (size_t)(((size_t) sizeof
((*qtblptr)->quantval))));
100 (*qtblptr)->sent_table = FALSE0;
101 }
102 }
103 /* Copy the source's per-component info.
104 * Note we assume jpeg_set_defaults has allocated the dest comp_info array.
105 */
106 dstinfo->num_components = srcinfo->num_components;
107 if (dstinfo->num_components < 1 || dstinfo->num_components > MAX_COMPONENTS10)
108 ERREXIT2(dstinfo, JERR_COMPONENT_COUNT, dstinfo->num_components,((dstinfo)->err->msg_code = (JERR_COMPONENT_COUNT), (dstinfo
)->err->msg_parm.i[0] = (dstinfo->num_components), (
dstinfo)->err->msg_parm.i[1] = (10), (*(dstinfo)->err
->error_exit) ((j_common_ptr) (dstinfo)))
109 MAX_COMPONENTS)((dstinfo)->err->msg_code = (JERR_COMPONENT_COUNT), (dstinfo
)->err->msg_parm.i[0] = (dstinfo->num_components), (
dstinfo)->err->msg_parm.i[1] = (10), (*(dstinfo)->err
->error_exit) ((j_common_ptr) (dstinfo)));
110 for (ci = 0, incomp = srcinfo->comp_info, outcomp = dstinfo->comp_info;
111 ci < dstinfo->num_components; ci++, incomp++, outcomp++) {
112 outcomp->component_id = incomp->component_id;
113 outcomp->h_samp_factor = incomp->h_samp_factor;
114 outcomp->v_samp_factor = incomp->v_samp_factor;
115 outcomp->quant_tbl_no = incomp->quant_tbl_no;
116 /* Make sure saved quantization table for component matches the qtable
117 * slot. If not, the input file re-used this qtable slot.
118 * IJG encoder currently cannot duplicate this.
119 */
120 tblno = outcomp->quant_tbl_no;
121 if (tblno < 0 || tblno >= NUM_QUANT_TBLS4 ||
122 srcinfo->quant_tbl_ptrs[tblno] == NULL((void*)0))
123 ERREXIT1(dstinfo, JERR_NO_QUANT_TABLE, tblno)((dstinfo)->err->msg_code = (JERR_NO_QUANT_TABLE), (dstinfo
)->err->msg_parm.i[0] = (tblno), (*(dstinfo)->err->
error_exit) ((j_common_ptr) (dstinfo)));
124 slot_quant = srcinfo->quant_tbl_ptrs[tblno];
125 c_quant = incomp->quant_table;
126 if (c_quant != NULL((void*)0)) {
127 for (coefi = 0; coefi < DCTSIZE264; coefi++) {
128 if (c_quant->quantval[coefi] != slot_quant->quantval[coefi])
129 ERREXIT1(dstinfo, JERR_MISMATCHED_QUANT_TABLE, tblno)((dstinfo)->err->msg_code = (JERR_MISMATCHED_QUANT_TABLE
), (dstinfo)->err->msg_parm.i[0] = (tblno), (*(dstinfo)
->err->error_exit) ((j_common_ptr) (dstinfo)));
130 }
131 }
132 /* Note: we do not copy the source's Huffman table assignments;
133 * instead we rely on jpeg_set_colorspace to have made a suitable choice.
134 */
135 }
136 /* Also copy JFIF version and resolution information, if available.
137 * Strictly speaking this isn't "critical" info, but it's nearly
138 * always appropriate to copy it if available. In particular,
139 * if the application chooses to copy JFIF 1.02 extension markers from
140 * the source file, we need to copy the version to make sure we don't
141 * emit a file that has 1.02 extensions but a claimed version of 1.01.
142 * We will *not*, however, copy version info from mislabeled "2.01" files.
143 */
144 if (srcinfo->saw_JFIF_marker) {
145 if (srcinfo->JFIF_major_version == 1) {
146 dstinfo->JFIF_major_version = srcinfo->JFIF_major_version;
147 dstinfo->JFIF_minor_version = srcinfo->JFIF_minor_version;
148 }
149 dstinfo->density_unit = srcinfo->density_unit;
150 dstinfo->X_density = srcinfo->X_density;
151 dstinfo->Y_density = srcinfo->Y_density;
152 }
153}
154
155
156/*
157 * Master selection of compression modules for transcoding.
158 * This substitutes for jcinit.c's initialization of the full compressor.
159 */
160
161LOCAL(void)static void
162transencode_master_selection (j_compress_ptr cinfo,
163 jvirt_barray_ptr * coef_arrays)
164{
165 /* Although we don't actually use input_components for transcoding,
166 * jcmaster.c's initial_setup will complain if input_components is 0.
167 */
168 cinfo->input_components = 1;
169 /* Initialize master control (includes parameter checking/processing) */
170 jinit_c_master_controljICMaster(cinfo, TRUE1 /* transcode only */);
171
172 /* Entropy encoding: either Huffman or arithmetic coding. */
173 if (cinfo->arith_code) {
174 ERREXIT(cinfo, JERR_ARITH_NOTIMPL)((cinfo)->err->msg_code = (JERR_ARITH_NOTIMPL), (*(cinfo
)->err->error_exit) ((j_common_ptr) (cinfo)));
175 } else {
176 if (cinfo->progressive_mode) {
177#ifdef C_PROGRESSIVE_SUPPORTED
178 jinit_phuff_encoderjIPHEncoder(cinfo);
179#else
180 ERREXIT(cinfo, JERR_NOT_COMPILED)((cinfo)->err->msg_code = (JERR_NOT_COMPILED), (*(cinfo
)->err->error_exit) ((j_common_ptr) (cinfo)));
181#endif
182 } else
183 jinit_huff_encoderjIHEncoder(cinfo);
184 }
185
186 /* We need a special coefficient buffer controller. */
187 transencode_coef_controller(cinfo, coef_arrays);
188
189 jinit_marker_writerjIMWriter(cinfo);
190
191 /* We can now tell the memory manager to allocate virtual arrays. */
192 (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
193
194 /* Write the datastream header (SOI, JFIF) immediately.
195 * Frame and scan headers are postponed till later.
196 * This lets application insert special markers after the SOI.
197 */
198 (*cinfo->marker->write_file_header) (cinfo);
199}
200
201
202/*
203 * The rest of this file is a special implementation of the coefficient
204 * buffer controller. This is similar to jccoefct.c, but it handles only
205 * output from presupplied virtual arrays. Furthermore, we generate any
206 * dummy padding blocks on-the-fly rather than expecting them to be present
207 * in the arrays.
208 */
209
210/* Private buffer controller object */
211
212typedef struct {
213 struct jpeg_c_coef_controller pub; /* public fields */
214
215 JDIMENSION iMCU_row_num; /* iMCU row # within image */
216 JDIMENSION mcu_ctr; /* counts MCUs processed in current row */
217 int MCU_vert_offset; /* counts MCU rows within iMCU row */
218 int MCU_rows_per_iMCU_row; /* number of such rows needed */
219
220 /* Virtual block array for each component. */
221 jvirt_barray_ptr * whole_image;
222
223 /* Workspace for constructing dummy blocks at right/bottom edges. */
224 JBLOCKROW dummy_buffer[C_MAX_BLOCKS_IN_MCU10];
225} my_coef_controller;
226
227typedef my_coef_controller * my_coef_ptr;
228
229
230LOCAL(void)static void
231start_iMCU_row (j_compress_ptr cinfo)
232/* Reset within-iMCU-row counters for a new row */
233{
234 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
235
236 /* In an interleaved scan, an MCU row is the same as an iMCU row.
237 * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
238 * But at the bottom of the image, process only what's left.
239 */
240 if (cinfo->comps_in_scan > 1) {
241 coef->MCU_rows_per_iMCU_row = 1;
242 } else {
243 if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1))
244 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor;
245 else
246 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
247 }
248
249 coef->mcu_ctr = 0;
250 coef->MCU_vert_offset = 0;
251}
252
253
254/*
255 * Initialize for a processing pass.
256 */
257
258METHODDEF(void)static void
259start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
260{
261 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
262
263 if (pass_mode != JBUF_CRANK_DEST)
264 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE)((cinfo)->err->msg_code = (JERR_BAD_BUFFER_MODE), (*(cinfo
)->err->error_exit) ((j_common_ptr) (cinfo)));
265
266 coef->iMCU_row_num = 0;
267 start_iMCU_row(cinfo);
268}
269
270
271/*
272 * Process some data.
273 * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
274 * per call, ie, v_samp_factor block rows for each component in the scan.
275 * The data is obtained from the virtual arrays and fed to the entropy coder.
276 * Returns TRUE if the iMCU row is completed, FALSE if suspended.
277 *
278 * NB: input_buf is ignored; it is likely to be a NULL pointer.
279 */
280
281METHODDEF(boolean)static boolean
282compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
283{
284 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
285 JDIMENSION MCU_col_num; /* index of current MCU within row */
286 JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1;
287 JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
288 int blkn, ci, xindex, yindex, yoffset, blockcnt;
289 JDIMENSION start_col;
290 JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN4];
291 JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU10];
292 JBLOCKROW buffer_ptr;
293 jpeg_component_info *compptr;
294
295 /* Align the virtual buffers for the components used in this scan. */
296 for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
1
Assuming 'ci' is >= field 'comps_in_scan'
→
2
←
Loop condition is false. Execution continues on line 305
→
297 compptr = cinfo->cur_comp_info[ci];
298 buffer[ci] = (*cinfo->mem->access_virt_barray)
299 ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index],
300 coef->iMCU_row_num * compptr->v_samp_factor,
301 (JDIMENSION) compptr->v_samp_factor, FALSE0);
302 }
303
304 /* Loop to process one whole iMCU row */
305 for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
3
←
Assuming 'yoffset' is < field 'MCU_rows_per_iMCU_row'
→
4
←
Loop condition is true. Entering loop body
→
306 yoffset++) {
307 for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row;
5
←
Assuming 'MCU_col_num' is < field 'MCUs_per_row'
→
6
←
Loop condition is true. Entering loop body
→
10
←
Assuming 'MCU_col_num' is < field 'MCUs_per_row'
→
11
←
Loop condition is true. Entering loop body
→
308 MCU_col_num++) {
309 /* Construct list of pointers to DCT blocks belonging to this MCU */
310 blkn = 0; /* index of current DCT block within MCU */
311 for (ci = 0; ci
6.1
'ci' is >= field 'comps_in_scan'
 < cinfo->comps_in_scan; ci++) {
7
←
Loop condition is false. Execution continues on line 341
→
12
←
Assuming 'ci' is < field 'comps_in_scan'
→
13
←
Loop condition is true. Entering loop body
→
312 compptr = cinfo->cur_comp_info[ci];
313 start_col = MCU_col_num * compptr->MCU_width;
314 blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
14
←
Assuming 'MCU_col_num' is >= 'last_MCU_col'
→
15
←
'?' condition is false
→
315 : compptr->last_col_width;
316 for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
16
←
Assuming 'yindex' is < field 'MCU_height'
→
17
←
Loop condition is true. Entering loop body
→
317 if (coef->iMCU_row_num < last_iMCU_row ||
18
←
Assuming 'last_iMCU_row' is > field 'iMCU_row_num'
→
318 yindex+yoffset < compptr->last_row_height) {
319 /* Fill in pointers to real blocks in this row */
320 buffer_ptr = buffer[ci][yindex+yoffset] + start_col;
19
←
Dereference of undefined pointer value
321 for (xindex = 0; xindex < blockcnt; xindex++)
322 MCU_buffer[blkn++] = buffer_ptr++;
323 } else {
324 /* At bottom of image, need a whole row of dummy blocks */
325 xindex = 0;
326 }
327 /* Fill in any dummy blocks needed in this row.
328 * Dummy blocks are filled in the same way as in jccoefct.c:
329 * all zeroes in the AC entries, DC entries equal to previous
330 * block's DC value. The init routine has already zeroed the
331 * AC entries, so we need only set the DC entries correctly.
332 */
333 for (; xindex < compptr->MCU_width; xindex++) {
334 MCU_buffer[blkn] = coef->dummy_buffer[blkn];
335 MCU_buffer[blkn][0][0] = MCU_buffer[blkn-1][0][0];
336 blkn++;
337 }
338 }
339 }
340 /* Try to write the MCU. */
341 if (! (*cinfo->entropy->encode_mcu) (cinfo, MCU_buffer)) {
8
←
Assuming the condition is false
→
9
←
Taking false branch
→
342 /* Suspension forced; update state counters and exit */
343 coef->MCU_vert_offset = yoffset;
344 coef->mcu_ctr = MCU_col_num;
345 return FALSE0;
346 }
347 }
348 /* Completed an MCU row, but perhaps not an iMCU row */
349 coef->mcu_ctr = 0;
350 }
351 /* Completed the iMCU row, advance counters for next one */
352 coef->iMCU_row_num++;
353 start_iMCU_row(cinfo);
354 return TRUE1;
355}
356
357
358/*
359 * Initialize coefficient buffer controller.
360 *
361 * Each passed coefficient array must be the right size for that
362 * coefficient: width_in_blocks wide and height_in_blocks high,
363 * with unitheight at least v_samp_factor.
364 */
365
366LOCAL(void)static void
367transencode_coef_controller (j_compress_ptr cinfo,
368 jvirt_barray_ptr * coef_arrays)
369{
370 my_coef_ptr coef;
371 JBLOCKROW buffer;
372 int i;
373
374 coef = (my_coef_ptr)
375 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE1,
376 SIZEOF(my_coef_controller)((size_t) sizeof(my_coef_controller)));
377 cinfo->coef = (struct jpeg_c_coef_controller *) coef;
378 coef->pub.start_pass = start_pass_coef;
379 coef->pub.compress_data = compress_output;
380
381 /* Save pointer to virtual arrays */
382 coef->whole_image = coef_arrays;
383
384 /* Allocate and pre-zero space for dummy DCT blocks. */
385 buffer = (JBLOCKROW)
386 (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE1,
387 C_MAX_BLOCKS_IN_MCU10 * SIZEOF(JBLOCK)((size_t) sizeof(JBLOCK)));
388 jzero_farjZeroFar((void FAR *) buffer, C_MAX_BLOCKS_IN_MCU10 * SIZEOF(JBLOCK)((size_t) sizeof(JBLOCK)));
389 for (i = 0; i < C_MAX_BLOCKS_IN_MCU10; i++) {
390 coef->dummy_buffer[i] = buffer + i;
391 }
392}