/* metadata key,value list object */
Jbig2Metadata *jbig2_metadata_new(Jbig2Ctx *ctx, Jbig2Encoding encoding)
{
Jbig2Metadata *md = jbig2_alloc(ctx->allocator, sizeof(Jbig2Metadata));
if (md != NULL) {
md->encoding = encoding;
md->entries = 0;
md->max_entries = 4;
md->keys = jbig2_alloc(ctx->allocator, md->max_entries*sizeof(char*));
md->values = jbig2_alloc(ctx->allocator, md->max_entries*sizeof(char*));
if (md->keys == NULL || md->values == NULL) {
jbig2_metadata_free(ctx, md);
md = NULL;
}
}
return md;
}
static char *jbig2_strndup(Jbig2Ctx *ctx, const char *c, const int len)
{
char *s = jbig2_alloc(ctx->allocator, len*sizeof(char));
if (s == NULL) {
jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1,
"unable to duplicate comment string");
} else {
memcpy(s, c, len);
}
return s;
}
Jbig2ArithIaidCtx *
jbig2_arith_iaid_ctx_new(Jbig2Ctx *ctx, int SBSYMCODELEN)
{
Jbig2ArithIaidCtx *result = jbig2_new(ctx, Jbig2ArithIaidCtx, 1);
int ctx_size = 1 << SBSYMCODELEN;
result->SBSYMCODELEN = SBSYMCODELEN;
result->IAIDx = jbig2_alloc(ctx->allocator, ctx_size);
memset(result->IAIDx, 0, ctx_size);
return result;
}
/**
* jbig2_decode_text_region: decode a text region segment
*
* @ctx: jbig2 decoder context
* @segment: jbig2 segment (header) structure
* @params: parameters from the text region header
* @dicts: an array of referenced symbol dictionaries
* @n_dicts: the number of referenced symbol dictionaries
* @image: image structure in which to store the decoded region bitmap
* @data: pointer to text region data to be decoded
* @size: length of text region data
*
* Implements the text region decoding procedure
* described in section 6.4 of the JBIG2 spec.
*
* returns: 0 on success
**/
int
jbig2_decode_text_region(Jbig2Ctx *ctx, Jbig2Segment *segment,
const Jbig2TextRegionParams *params,
const Jbig2SymbolDict * const *dicts, const int n_dicts,
Jbig2Image *image,
const byte *data, const size_t size,
Jbig2ArithCx *GR_stats, Jbig2ArithState *as, Jbig2WordStream *ws)
{
/* relevent bits of 6.4.4 */
uint32_t NINSTANCES;
uint32_t ID;
int32_t STRIPT;
int32_t FIRSTS;
int32_t DT;
int32_t DFS;
int32_t IDS;
int32_t CURS;
int32_t CURT;
int S,T;
int x,y;
bool first_symbol;
uint32_t index, SBNUMSYMS;
Jbig2Image *IB;
Jbig2HuffmanState *hs = NULL;
Jbig2HuffmanTable *SBSYMCODES = NULL;
int code = 0;
int RI;
SBNUMSYMS = 0;
for (index = 0; index < n_dicts; index++) {
SBNUMSYMS += dicts[index]->n_symbols;
}
jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,
"symbol list contains %d glyphs in %d dictionaries", SBNUMSYMS, n_dicts);
if (params->SBHUFF) {
Jbig2HuffmanTable *runcodes;
Jbig2HuffmanParams runcodeparams;
Jbig2HuffmanLine runcodelengths[35];
Jbig2HuffmanLine *symcodelengths;
Jbig2HuffmanParams symcodeparams;
int code, err, len, range, r;
jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,
"huffman coded text region");
hs = jbig2_huffman_new(ctx, ws);
/* 7.4.3.1.7 - decode symbol ID Huffman table */
/* this is actually part of the segment header, but it is more
convenient to handle it here */
/* parse and build the runlength code huffman table */
for (index = 0; index < 35; index++) {
runcodelengths[index].PREFLEN = jbig2_huffman_get_bits(hs, 4);
runcodelengths[index].RANGELEN = 0;
runcodelengths[index].RANGELOW = index;
jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,
" read runcode%d length %d", index, runcodelengths[index].PREFLEN);
}
runcodeparams.HTOOB = 0;
runcodeparams.lines = runcodelengths;
runcodeparams.n_lines = 35;
runcodes = jbig2_build_huffman_table(ctx, &runcodeparams);
if (runcodes == NULL) {
jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"error constructing symbol id runcode table!");
return -1;
}
/* decode the symbol id codelengths using the runlength table */
symcodelengths = jbig2_alloc(ctx->allocator, SBNUMSYMS*sizeof(Jbig2HuffmanLine));
if (symcodelengths == NULL) {
jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"memory allocation failure reading symbol ID huffman table!");
return -1;
}
index = 0;
while (index < SBNUMSYMS) {
code = jbig2_huffman_get(hs, runcodes, &err);
if (err != 0 || code < 0 || code >= 35) {
jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"error reading symbol ID huffman table!");
return err ? err : -1;
}
if (code < 32) {
len = code;
range = 1;
} else {
if (index < 1) {
jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"error decoding symbol id table: run length with no antecedent!");
/* todo: memory cleanup */
return -1;
}
if (code == 32) {
len = symcodelengths[index-1].PREFLEN;
} else {
len = 0; /* code == 33 or 34 */
}
if (code == 32) range = jbig2_huffman_get_bits(hs, 2) + 3;
else if (code == 33) range = jbig2_huffman_get_bits(hs, 3) + 3;
else if (code == 34) range = jbig2_huffman_get_bits(hs, 7) + 11;
}
jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,
" read runcode%d at index %d (length %d range %d)", code, index, len, range);
if (index+range > SBNUMSYMS) {
jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
"runlength extends %d entries beyond the end of symbol id table!",
index+range - SBNUMSYMS);
range = SBNUMSYMS - index;
}
for (r = 0; r < range; r++) {
symcodelengths[index+r].PREFLEN = len;
symcodelengths[index+r].RANGELEN = 0;
symcodelengths[index+r].RANGELOW = index + r;
}
index += r;
}
if (index < SBNUMSYMS) {
jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
"runlength codes do not cover the available symbol set");
}
symcodeparams.HTOOB = 0;
symcodeparams.lines = symcodelengths;
symcodeparams.n_lines = SBNUMSYMS;
/* skip to byte boundary */
jbig2_huffman_skip(hs);
/* finally, construct the symbol id huffman table itself */
SBSYMCODES = jbig2_build_huffman_table(ctx, &symcodeparams);
jbig2_free(ctx->allocator, symcodelengths);
jbig2_release_huffman_table(ctx, runcodes);
if (SBSYMCODES == NULL) {
jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"could not construct Symbol ID huffman table!");
return -1;
}
}
/* 6.4.5 (1) */
jbig2_image_clear(ctx, image, params->SBDEFPIXEL);
/* 6.4.6 */
if (params->SBHUFF) {
STRIPT = jbig2_huffman_get(hs, params->SBHUFFDT, &code);
} else {
code = jbig2_arith_int_decode(params->IADT, as, &STRIPT);
}
/* 6.4.5 (2) */
STRIPT *= -(params->SBSTRIPS);
FIRSTS = 0;
NINSTANCES = 0;
/* 6.4.5 (3) */
while (NINSTANCES < params->SBNUMINSTANCES) {
/* (3b) */
if (params->SBHUFF) {
DT = jbig2_huffman_get(hs, params->SBHUFFDT, &code);
} else {
code = jbig2_arith_int_decode(params->IADT, as, &DT);
}
DT *= params->SBSTRIPS;
STRIPT += DT;
first_symbol = TRUE;
/* 6.4.5 (3c) - decode symbols in strip */
for (;;) {
/* (3c.i) */
if (first_symbol) {
/* 6.4.7 */
if (params->SBHUFF) {
DFS = jbig2_huffman_get(hs, params->SBHUFFFS, &code);
} else {
code = jbig2_arith_int_decode(params->IAFS, as, &DFS);
}
FIRSTS += DFS;
CURS = FIRSTS;
first_symbol = FALSE;
} else {
/* (3c.ii) / 6.4.8 */
if (params->SBHUFF) {
IDS = jbig2_huffman_get(hs, params->SBHUFFDS, &code);
} else {
code = jbig2_arith_int_decode(params->IADS, as, &IDS);
}
if (code) {
break;
}
CURS += IDS + params->SBDSOFFSET;
}
/* (3c.iii) / 6.4.9 */
if (params->SBSTRIPS == 1) {
CURT = 0;
} else if (params->SBHUFF) {
CURT = jbig2_huffman_get_bits(hs, params->LOGSBSTRIPS);
} else {
code = jbig2_arith_int_decode(params->IAIT, as, &CURT);
}
T = STRIPT + CURT;
/* (3b.iv) / 6.4.10 - decode the symbol id */
if (params->SBHUFF) {
ID = jbig2_huffman_get(hs, SBSYMCODES, &code);
} else {
code = jbig2_arith_iaid_decode(params->IAID, as, (int *)&ID);
}
if (ID >= SBNUMSYMS) {
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"symbol id out of range! (%d/%d)", ID, SBNUMSYMS);
}
/* (3c.v) / 6.4.11 - look up the symbol bitmap IB */
{
uint32_t id = ID;
index = 0;
while (id >= dicts[index]->n_symbols)
id -= dicts[index++]->n_symbols;
IB = jbig2_image_clone(ctx, dicts[index]->glyphs[id]);
}
if (params->SBREFINE) {
if (params->SBHUFF) {
RI = jbig2_huffman_get_bits(hs, 1);
} else {
code = jbig2_arith_int_decode(params->IARI, as, &RI);
}
} else {
RI = 0;
}
if (RI) {
Jbig2RefinementRegionParams rparams;
Jbig2Image *IBO;
int32_t RDW, RDH, RDX, RDY;
Jbig2Image *image;
int BMSIZE = 0;
/* 6.4.11 (1, 2, 3, 4) */
if (!params->SBHUFF) {
code = jbig2_arith_int_decode(params->IARDW, as, &RDW);
code = jbig2_arith_int_decode(params->IARDH, as, &RDH);
code = jbig2_arith_int_decode(params->IARDX, as, &RDX);
code = jbig2_arith_int_decode(params->IARDY, as, &RDY);
} else {
RDW = jbig2_huffman_get(hs, params->SBHUFFRDW, &code);
RDH = jbig2_huffman_get(hs, params->SBHUFFRDH, &code);
RDX = jbig2_huffman_get(hs, params->SBHUFFRDX, &code);
RDY = jbig2_huffman_get(hs, params->SBHUFFRDY, &code);
BMSIZE = jbig2_huffman_get(hs, params->SBHUFFRSIZE, &code);
jbig2_huffman_skip(hs);
}
/* 6.4.11 (6) */
IBO = IB;
image = jbig2_image_new(ctx, IBO->width + RDW,
IBO->height + RDH);
/* Table 12 */
rparams.GRTEMPLATE = params->SBRTEMPLATE;
rparams.reference = IBO;
rparams.DX = (RDW >> 1) + RDX;
rparams.DY = (RDH >> 1) + RDY;
rparams.TPGRON = 0;
memcpy(rparams.grat, params->sbrat, 4);
jbig2_decode_refinement_region(ctx, segment,
&rparams, as, image, GR_stats);
IB = image;
jbig2_image_release(ctx, IBO);
/* 6.4.11 (7) */
if (params->SBHUFF) {
jbig2_huffman_advance(hs, BMSIZE);
}
}
/* (3c.vi) */
if ((!params->TRANSPOSED) && (params->REFCORNER > 1)) {
CURS += IB->width - 1;
} else if ((params->TRANSPOSED) && !(params->REFCORNER & 1)) {
CURS += IB->height - 1;
}
/* (3c.vii) */
S = CURS;
/* (3c.viii) */
if (!params->TRANSPOSED) {
switch (params->REFCORNER) { /* FIXME: double check offsets */
case JBIG2_CORNER_TOPLEFT: x = S; y = T; break;
case JBIG2_CORNER_TOPRIGHT: x = S - IB->width + 1; y = T; break;
case JBIG2_CORNER_BOTTOMLEFT: x = S; y = T - IB->height + 1; break;
case JBIG2_CORNER_BOTTOMRIGHT: x = S - IB->width + 1; y = T - IB->height + 1; break;
}
} else { /* TRANSPOSED */
switch (params->REFCORNER) {
case JBIG2_CORNER_TOPLEFT: y = S; x = T; break;
case JBIG2_CORNER_TOPRIGHT: y = S - IB->width + 1; x = T; break;
case JBIG2_CORNER_BOTTOMLEFT: y = S; x = T - IB->height + 1; break;
case JBIG2_CORNER_BOTTOMRIGHT: y = S - IB->width + 1; x = T - IB->height + 1; break;
}
}
/* (3c.ix) */
#ifdef JBIG2_DEBUG
jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,
"composing glyph id %d: %dx%d @ (%d,%d) symbol %d/%d",
ID, IB->width, IB->height, x, y, NINSTANCES + 1,
params->SBNUMINSTANCES);
#endif
jbig2_image_compose(ctx, image, IB, x, y, params->SBCOMBOP);
/* (3c.x) */
if ((!params->TRANSPOSED) && (params->REFCORNER < 2)) {
CURS += IB->width -1 ;
} else if ((params->TRANSPOSED) && (params->REFCORNER & 1)) {
CURS += IB->height - 1;
}
/* (3c.xi) */
NINSTANCES++;
jbig2_image_release(ctx, IB);
}
/* end strip */
}
/* 6.4.5 (4) */
if (params->SBHUFF) {
jbig2_release_huffman_table(ctx, SBSYMCODES);
}
return 0;
}
/**
* jbig2_parse_text_region: read a text region segment header
**/
int
jbig2_parse_text_region(Jbig2Ctx *ctx, Jbig2Segment *segment, const byte *segment_data)
{
int offset = 0;
Jbig2RegionSegmentInfo region_info;
Jbig2TextRegionParams params;
Jbig2Image *image;
Jbig2SymbolDict **dicts;
int n_dicts;
uint16_t flags;
uint16_t huffman_flags = 0;
Jbig2ArithCx *GR_stats = NULL;
int code = 0;
Jbig2WordStream *ws = NULL;
Jbig2ArithState *as = NULL;
/* 7.4.1 */
if (segment->data_length < 17)
goto too_short;
jbig2_get_region_segment_info(®ion_info, segment_data);
offset += 17;
/* 7.4.3.1.1 */
flags = jbig2_get_int16(segment_data + offset);
offset += 2;
jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,
"text region header flags 0x%04x", flags);
params.SBHUFF = flags & 0x0001;
params.SBREFINE = flags & 0x0002;
params.LOGSBSTRIPS = (flags & 0x000c) >> 2;
params.SBSTRIPS = 1 << params.LOGSBSTRIPS;
params.REFCORNER = (flags & 0x0030) >> 4;
params.TRANSPOSED = flags & 0x0040;
params.SBCOMBOP = (flags & 0x0180) >> 7;
params.SBDEFPIXEL = flags & 0x0200;
/* SBDSOFFSET is a signed 5 bit integer */
params.SBDSOFFSET = (flags & 0x7C00) >> 10;
if (params.SBDSOFFSET > 0x0f) params.SBDSOFFSET -= 0x20;
params.SBRTEMPLATE = flags & 0x8000;
if (params.SBDSOFFSET) {
jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,
"text region has SBDSOFFSET %d", params.SBDSOFFSET);
}
if (params.SBHUFF) /* Huffman coding */
{
/* 7.4.3.1.2 */
huffman_flags = jbig2_get_int16(segment_data + offset);
offset += 2;
if (huffman_flags & 0x8000)
jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
"reserved bit 15 of text region huffman flags is not zero");
}
else /* arithmetic coding */
{
/* 7.4.3.1.3 */
if ((params.SBREFINE) && !(params.SBRTEMPLATE))
{
params.sbrat[0] = segment_data[offset];
params.sbrat[1] = segment_data[offset + 1];
params.sbrat[2] = segment_data[offset + 2];
params.sbrat[3] = segment_data[offset + 3];
offset += 4;
}
}
/* 7.4.3.1.4 */
params.SBNUMINSTANCES = jbig2_get_int32(segment_data + offset);
offset += 4;
if (params.SBHUFF) {
/* 7.4.3.1.5 - Symbol ID Huffman table */
/* ...this is handled in the segment body decoder */
/* 7.4.3.1.6 - Other Huffman table selection */
switch (huffman_flags & 0x0003) {
case 0: /* Table B.6 */
params.SBHUFFFS = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_F);
break;
case 1: /* Table B.7 */
params.SBHUFFFS = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_G);
break;
case 3: /* Custom table from referred segment */
/* We handle this case later by leaving the table as NULL */
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region uses custom FS huffman table (NYI)");
break;
case 2: /* invalid */
default:
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region specified invalid FS huffman table");
break;
}
switch ((huffman_flags & 0x000c) >> 2) {
case 0: /* Table B.8 */
params.SBHUFFDS = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_H);
break;
case 1: /* Table B.9 */
params.SBHUFFDS = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_I);
break;
case 2: /* Table B.10 */
params.SBHUFFDS = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_J);
break;
case 3: /* Custom table from referred segment */
/* We handle this case later by leaving the table as NULL */
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region uses custom DS huffman table (NYI)");
break;
}
switch ((huffman_flags & 0x0030) >> 4) {
case 0: /* Table B.11 */
params.SBHUFFDT = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_K);
break;
case 1: /* Table B.12 */
params.SBHUFFDT = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_L);
break;
case 2: /* Table B.13 */
params.SBHUFFDT = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_M);
break;
case 3: /* Custom table from referred segment */
/* We handle this case later by leaving the table as NULL */
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region uses custom DT huffman table (NYI)");
break;
}
switch ((huffman_flags & 0x00c0) >> 6) {
case 0: /* Table B.14 */
params.SBHUFFRDW = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_N);
break;
case 1: /* Table B.15 */
params.SBHUFFRDW = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_O);
break;
case 3: /* Custom table from referred segment */
/* We handle this case later by leaving the table as NULL */
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region uses custom RDW huffman table (NYI)");
break;
case 2: /* invalid */
default:
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region specified invalid RDW huffman table");
break;
}
switch ((huffman_flags & 0x0300) >> 8) {
case 0: /* Table B.14 */
params.SBHUFFRDH = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_N);
break;
case 1: /* Table B.15 */
params.SBHUFFRDH = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_O);
break;
case 3: /* Custom table from referred segment */
/* We handle this case later by leaving the table as NULL */
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region uses custom RDH huffman table (NYI)");
break;
case 2: /* invalid */
default:
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region specified invalid RDH huffman table");
break;
}
switch ((huffman_flags & 0x0c00) >> 10) {
case 0: /* Table B.14 */
params.SBHUFFRDX = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_N);
break;
case 1: /* Table B.15 */
params.SBHUFFRDX = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_O);
break;
case 3: /* Custom table from referred segment */
/* We handle this case later by leaving the table as NULL */
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region uses custom RDX huffman table (NYI)");
break;
case 2: /* invalid */
default:
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region specified invalid RDX huffman table");
break;
}
switch ((huffman_flags & 0x3000) >> 12) {
case 0: /* Table B.14 */
params.SBHUFFRDY = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_N);
break;
case 1: /* Table B.15 */
params.SBHUFFRDY = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_O);
break;
case 3: /* Custom table from referred segment */
/* We handle this case later by leaving the table as NULL */
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region uses custom RDY huffman table (NYI)");
break;
case 2: /* invalid */
default:
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region specified invalid RDY huffman table");
break;
}
switch ((huffman_flags & 0x4000) >> 14) {
case 0: /* Table B.1 */
params.SBHUFFRSIZE = jbig2_build_huffman_table(ctx,
&jbig2_huffman_params_A);
break;
case 1: /* Custom table from referred segment */
/* We handle this case later by leaving the table as NULL */
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region uses custom RSIZE huffman table (NYI)");
break;
}
if (huffman_flags & 0x8000) {
jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
"text region huffman flags bit 15 is set, contrary to spec");
}
/* 7.4.3.1.7 */
/* For convenience this is done in the body decoder routine */
}
jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number,
"text region: %d x %d @ (%d,%d) %d symbols",
region_info.width, region_info.height,
region_info.x, region_info.y, params.SBNUMINSTANCES);
/* 7.4.3.2 (2) - compose the list of symbol dictionaries */
n_dicts = jbig2_sd_count_referred(ctx, segment);
if (n_dicts != 0) {
dicts = jbig2_sd_list_referred(ctx, segment);
} else {
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"text region refers to no symbol dictionaries!");
}
if (dicts == NULL) {
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"unable to retrive symbol dictionaries!"
" previous parsing error?");
} else {
int index;
if (dicts[0] == NULL) {
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING,
segment->number,
"unable to find first referenced symbol dictionary!");
}
for (index = 1; index < n_dicts; index++)
if (dicts[index] == NULL) {
jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
"unable to find all referenced symbol dictionaries!");
n_dicts = index;
}
}
/* 7.4.3.2 (3) */
if (!params.SBHUFF && params.SBREFINE) {
int stats_size = params.SBRTEMPLATE ? 1 << 10 : 1 << 13;
GR_stats = jbig2_alloc(ctx->allocator, stats_size);
memset(GR_stats, 0, stats_size);
}
image = jbig2_image_new(ctx, region_info.width, region_info.height);
ws = jbig2_word_stream_buf_new(ctx, segment_data + offset, segment->data_length - offset);
if (!params.SBHUFF) {
int SBSYMCODELEN, index;
int SBNUMSYMS = 0;
for (index = 0; index < n_dicts; index++) {
SBNUMSYMS += dicts[index]->n_symbols;
}
as = jbig2_arith_new(ctx, ws);
ws = 0;
params.IADT = jbig2_arith_int_ctx_new(ctx);
params.IAFS = jbig2_arith_int_ctx_new(ctx);
params.IADS = jbig2_arith_int_ctx_new(ctx);
params.IAIT = jbig2_arith_int_ctx_new(ctx);
/* Table 31 */
for (SBSYMCODELEN = 0; (1 << SBSYMCODELEN) < SBNUMSYMS; SBSYMCODELEN++);
params.IAID = jbig2_arith_iaid_ctx_new(ctx, SBSYMCODELEN);
params.IARI = jbig2_arith_int_ctx_new(ctx);
params.IARDW = jbig2_arith_int_ctx_new(ctx);
params.IARDH = jbig2_arith_int_ctx_new(ctx);
params.IARDX = jbig2_arith_int_ctx_new(ctx);
params.IARDY = jbig2_arith_int_ctx_new(ctx);
}
code = jbig2_decode_text_region(ctx, segment, ¶ms,
(const Jbig2SymbolDict * const *)dicts, n_dicts, image,
segment_data + offset, segment->data_length - offset,
GR_stats, as, ws);
if (!params.SBHUFF && params.SBREFINE) {
jbig2_free(ctx->allocator, GR_stats);
}
if (params.SBHUFF) {
jbig2_release_huffman_table(ctx, params.SBHUFFFS);
jbig2_release_huffman_table(ctx, params.SBHUFFDS);
jbig2_release_huffman_table(ctx, params.SBHUFFDT);
jbig2_release_huffman_table(ctx, params.SBHUFFRDX);
jbig2_release_huffman_table(ctx, params.SBHUFFRDY);
jbig2_release_huffman_table(ctx, params.SBHUFFRDW);
jbig2_release_huffman_table(ctx, params.SBHUFFRDH);
jbig2_release_huffman_table(ctx, params.SBHUFFRSIZE);
}
else {
jbig2_arith_int_ctx_free(ctx, params.IADT);
jbig2_arith_int_ctx_free(ctx, params.IAFS);
jbig2_arith_int_ctx_free(ctx, params.IADS);
jbig2_arith_int_ctx_free(ctx, params.IAIT);
jbig2_arith_iaid_ctx_free(ctx, params.IAID);
jbig2_arith_int_ctx_free(ctx, params.IARI);
jbig2_arith_int_ctx_free(ctx, params.IARDW);
jbig2_arith_int_ctx_free(ctx, params.IARDH);
jbig2_arith_int_ctx_free(ctx, params.IARDX);
jbig2_arith_int_ctx_free(ctx, params.IARDY);
jbig2_free(ctx->allocator, as);
jbig2_word_stream_buf_free(ctx, ws);
}
jbig2_free(ctx->allocator, dicts);
/* todo: check errors */
if ((segment->flags & 63) == 4) {
/* we have an intermediate region here. save it for later */
segment->result = image;
} else {
/* otherwise composite onto the page */
jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,
"composing %dx%d decoded text region onto page at (%d, %d)",
region_info.width, region_info.height, region_info.x, region_info.y);
jbig2_page_add_result(ctx, &ctx->pages[ctx->current_page], image,
region_info.x, region_info.y, region_info.op);
jbig2_image_release(ctx, image);
}
/* success */
return 0;
too_short:
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
"Segment too short");
}
