METHODDEF boolean get_app0(j_decompress_ptr cinfo)
/* Process an APP0 marker */
{
#define JFIF_LEN 14
INT32 length;
UINT8 b[JFIF_LEN];
int buffp;
INPUT_VARS(cinfo);
INPUT_2BYTES(cinfo, length, return FALSE);
length -= 2;
/* See if a JFIF APP0 marker is present */
if(length >= JFIF_LEN)
{
for(buffp = 0; buffp < JFIF_LEN; buffp++)
INPUT_BYTE(cinfo, b[buffp], return FALSE);
length -= JFIF_LEN;
if(b[0] == 0x4A && b[1] == 0x46 && b[2] == 0x49 && b[3] == 0x46 && b[4] == 0)
{
/* Found JFIF APP0 marker: check version */
/* Major version must be 1, anything else signals an incompatible change.
* We used to treat this as an error, but now it's a nonfatal warning,
* because some bozo at Hijaak couldn't read the spec.
* Minor version should be 0..2, but process anyway if newer.
*/
if(b[5] != 1)
WARNMS2(cinfo, JWRN_JFIF_MAJOR, b[5], b[6]);
else if(b[6] > 2)
TRACEMS2(cinfo, 1, JTRC_JFIF_MINOR, b[5], b[6]);
/* Save info */
cinfo->saw_JFIF_marker = TRUE;
cinfo->density_unit = b[7];
cinfo->X_density = (b[8] << 8) + b[9];
cinfo->Y_density = (b[10] << 8) + b[11];
TRACEMS3(cinfo, 1, JTRC_JFIF, cinfo->X_density, cinfo->Y_density, cinfo->density_unit);
if(b[12] | b[13])
TRACEMS2(cinfo, 1, JTRC_JFIF_THUMBNAIL, b[12], b[13]);
if(length != ((INT32) b[12] * (INT32) b[13] * (INT32) 3))
TRACEMS1(cinfo, 1, JTRC_JFIF_BADTHUMBNAILSIZE, (int)length);
}
else
{
/* Start of APP0 does not match "JFIF" */
TRACEMS1(cinfo, 1, JTRC_APP0, (int)length + JFIF_LEN);
}
}
else
{
METHODDEF void start_pass_phuff_decoder(j_decompress_ptr cinfo)
{
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
boolean is_DC_band, bad;
int ci, coefi, tbl;
int *coef_bit_ptr;
jpeg_component_info *compptr;
is_DC_band = (cinfo->Ss == 0);
/* Validate scan parameters */
bad = FALSE;
if(is_DC_band)
{
if(cinfo->Se != 0)
bad = TRUE;
}
else
{
/* need not check Ss/Se < 0 since they came from unsigned bytes */
if(cinfo->Ss > cinfo->Se || cinfo->Se >= DCTSIZE2)
bad = TRUE;
/* AC scans may have only one component */
if(cinfo->comps_in_scan != 1)
bad = TRUE;
}
if(cinfo->Ah != 0)
{
/* Successive approximation refinement scan: must have Al = Ah-1. */
if(cinfo->Al != cinfo->Ah - 1)
bad = TRUE;
}
if(cinfo->Al > 13) /* need not check for < 0 */
bad = TRUE;
if(bad)
ERREXIT4(cinfo, JERR_BAD_PROGRESSION, cinfo->Ss, cinfo->Se, cinfo->Ah, cinfo->Al);
/* Update progression status, and verify that scan order is legal.
* Note that inter-scan inconsistencies are treated as warnings
* not fatal errors ... not clear if this is right way to behave.
*/
for(ci = 0; ci < cinfo->comps_in_scan; ci++)
{
int cindex = cinfo->cur_comp_info[ci]->component_index;
coef_bit_ptr = &cinfo->coef_bits[cindex][0];
if(!is_DC_band && coef_bit_ptr[0] < 0) /* AC without prior DC scan */
WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, 0);
for(coefi = cinfo->Ss; coefi <= cinfo->Se; coefi++)
{
int expected = (coef_bit_ptr[coefi] < 0) ? 0 : coef_bit_ptr[coefi];
if(cinfo->Ah != expected)
WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, coefi);
coef_bit_ptr[coefi] = cinfo->Al;
}
}
/* Select MCU decoding routine */
if(cinfo->Ah == 0)
{
if(is_DC_band)
entropy->pub.decode_mcu = decode_mcu_DC_first;
else
entropy->pub.decode_mcu = decode_mcu_AC_first;
}
else
{
if(is_DC_band)
entropy->pub.decode_mcu = decode_mcu_DC_refine;
else
entropy->pub.decode_mcu = decode_mcu_AC_refine;
}
for(ci = 0; ci < cinfo->comps_in_scan; ci++)
{
compptr = cinfo->cur_comp_info[ci];
/* Make sure requested tables are present, and compute derived tables.
* We may build same derived table more than once, but it's not expensive.
*/
if(is_DC_band)
{
if(cinfo->Ah == 0)
{ /* DC refinement needs no table */
tbl = compptr->dc_tbl_no;
if(tbl < 0 || tbl >= NUM_HUFF_TBLS || cinfo->dc_huff_tbl_ptrs[tbl] == NULL)
ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tbl);
jpeg_make_d_derived_tbl(cinfo, cinfo->dc_huff_tbl_ptrs[tbl], &entropy->derived_tbls[tbl]);
}
}
else
{
tbl = compptr->ac_tbl_no;
if(tbl < 0 || tbl >= NUM_HUFF_TBLS || cinfo->ac_huff_tbl_ptrs[tbl] == NULL)
ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tbl);
jpeg_make_d_derived_tbl(cinfo, cinfo->ac_huff_tbl_ptrs[tbl], &entropy->derived_tbls[tbl]);
/* remember the single active table */
entropy->ac_derived_tbl = entropy->derived_tbls[tbl];
}
/* Initialize DC predictions to 0 */
entropy->saved.last_dc_val[ci] = 0;
}
/* Initialize bitread state variables */
entropy->bitstate.bits_left = 0;
entropy->bitstate.get_buffer = 0; /* unnecessary, but keeps Purify quiet */
entropy->bitstate.printed_eod = FALSE;
/* Initialize private state variables */
entropy->saved.EOBRUN = 0;
/* Initialize restart counter */
entropy->restarts_to_go = cinfo->restart_interval;
}
start_pass_phuff_decoder (j_decompress_ptr cinfo)
{
phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
boolean is_DC_band, bad;
int ci, coefi, tbl;
int *coef_bit_ptr;
jpeg_component_info * compptr;
is_DC_band = (cinfo->Ss == 0);
/* Validate scan parameters */
bad = FALSE;
if (is_DC_band) {
if (cinfo->Se != 0)
bad = TRUE;
} else {
/* need not check Ss/Se < 0 since they came from unsigned bytes */
if (cinfo->Ss > cinfo->Se || cinfo->Se >= DCTSIZE2)
bad = TRUE;
/* AC scans may have only one component */
if (cinfo->comps_in_scan != 1)
bad = TRUE;
}
if (cinfo->Ah != 0) {
/* Successive approximation refinement scan: must have Al = Ah-1. */
if (cinfo->Al != cinfo->Ah-1)
bad = TRUE;
}
if (cinfo->Al > 13) /* need not check for < 0 */
bad = TRUE;
/* Arguably the maximum Al value should be less than 13 for 8-bit precision,
* but the spec doesn't say so, and we try to be liberal about what we
* accept. Note: large Al values could result in out-of-range DC
* coefficients during early scans, leading to bizarre displays due to
* overflows in the IDCT math. But we won't crash.
*/
if (bad)
ERREXIT4(cinfo, JERR_BAD_PROGRESSION,
cinfo->Ss, cinfo->Se, cinfo->Ah, cinfo->Al);
/* Update progression status, and verify that scan order is legal.
* Note that inter-scan inconsistencies are treated as warnings
* not fatal errors ... not clear if this is right way to behave.
*/
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
int cindex = cinfo->cur_comp_info[ci]->component_index;
coef_bit_ptr = & cinfo->coef_bits[cindex][0];
if (!is_DC_band && coef_bit_ptr[0] < 0) /* AC without prior DC scan */
WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, 0);
for (coefi = cinfo->Ss; coefi <= cinfo->Se; coefi++) {
int expected = (coef_bit_ptr[coefi] < 0) ? 0 : coef_bit_ptr[coefi];
if (cinfo->Ah != expected)
WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, coefi);
coef_bit_ptr[coefi] = cinfo->Al;
}
}
/* Select MCU decoding routine */
if (cinfo->Ah == 0) {
if (is_DC_band)
entropy->pub.decode_mcu = decode_mcu_DC_first;
else
entropy->pub.decode_mcu = decode_mcu_AC_first;
} else {
if (is_DC_band)
entropy->pub.decode_mcu = decode_mcu_DC_refine;
else
entropy->pub.decode_mcu = decode_mcu_AC_refine;
}
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
/* Make sure requested tables are present, and compute derived tables.
* We may build same derived table more than once, but it's not expensive.
*/
if (is_DC_band) {
if (cinfo->Ah == 0) { /* DC refinement needs no table */
tbl = compptr->dc_tbl_no;
jpeg_make_d_derived_tbl(cinfo, TRUE, tbl,
& entropy->derived_tbls[tbl]);
}
} else {
tbl = compptr->ac_tbl_no;
jpeg_make_d_derived_tbl(cinfo, FALSE, tbl,
& entropy->derived_tbls[tbl]);
/* remember the single active table */
entropy->ac_derived_tbl = entropy->derived_tbls[tbl];
}
/* Initialize DC predictions to 0 */
entropy->saved.last_dc_val[ci] = 0;
}
/* Initialize bitread state variables */
entropy->bitstate.bits_left = 0;
entropy->bitstate.get_buffer = 0; /* unnecessary, but keeps Purify quiet */
entropy->pub.insufficient_data = FALSE;
/* Initialize private state variables */
entropy->saved.EOBRUN = 0;
/* Initialize restart counter */
entropy->restarts_to_go = cinfo->restart_interval;
}
initial_setup (j_decompress_ptr cinfo)
/* Called once, when first SOS marker is reached */
{
int ci;
jpeg_component_info *compptr;
/* Make sure image isn't bigger than I can handle */
if ((long) cinfo->image_height > (long) JPEG_MAX_DIMENSION ||
(long) cinfo->image_width > (long) JPEG_MAX_DIMENSION)
ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
if (cinfo->process == JPROC_LOSSLESS) {
/* If precision > compiled-in value, we must downscale */
if (cinfo->data_precision > BITS_IN_JSAMPLE)
WARNMS2(cinfo, JWRN_MUST_DOWNSCALE,
cinfo->data_precision, BITS_IN_JSAMPLE);
}
else { /* Lossy processes */
/* For now, precision must match compiled-in value... */
if (cinfo->data_precision != BITS_IN_JSAMPLE)
ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
}
/* Check that number of components won't exceed internal array sizes */
if (cinfo->num_components > MAX_COMPONENTS)
ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
MAX_COMPONENTS);
/* Compute maximum sampling factors; check factor validity */
cinfo->max_h_samp_factor = 1;
cinfo->max_v_samp_factor = 1;
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
ci++, compptr++) {
if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR ||
compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR)
ERREXIT(cinfo, JERR_BAD_SAMPLING);
cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor,
compptr->h_samp_factor);
cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor,
compptr->v_samp_factor);
}
/* We initialize codec_data_unit and min_codec_data_unit to data_unit.
* In the full decompressor, this will be overridden by jdmaster.c;
* but in the transcoder, jdmaster.c is not used, so we must do it here.
*/
cinfo->min_codec_data_unit = cinfo->data_unit;
/* Compute dimensions of components */
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
ci++, compptr++) {
compptr->codec_data_unit = cinfo->data_unit;
/* Size in data units */
compptr->width_in_data_units = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
(long) (cinfo->max_h_samp_factor * cinfo->data_unit));
compptr->height_in_data_units = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
(long) (cinfo->max_v_samp_factor * cinfo->data_unit));
/* downsampled_width and downsampled_height will also be overridden by
* jdmaster.c if we are doing full decompression. The transcoder library
* doesn't use these values, but the calling application might.
*/
/* Size in samples */
compptr->downsampled_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
(long) cinfo->max_h_samp_factor);
compptr->downsampled_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
(long) cinfo->max_v_samp_factor);
/* Mark component needed, until color conversion says otherwise */
compptr->component_needed = TRUE;
/* Mark no quantization table yet saved for component */
compptr->quant_table = NULL;
}
/* Compute number of fully interleaved MCU rows. */
cinfo->total_iMCU_rows = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height,
(long) (cinfo->max_v_samp_factor*cinfo->data_unit));
/* Decide whether file contains multiple scans */
if (cinfo->comps_in_scan < cinfo->num_components ||
cinfo->process == JPROC_PROGRESSIVE)
cinfo->inputctl->has_multiple_scans = TRUE;
else
cinfo->inputctl->has_multiple_scans = FALSE;
}
jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace)
{
jpeg_component_info * compptr;
int ci;
#define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl) \
(compptr = &cinfo->comp_info[index], \
compptr->component_id = (id), \
compptr->h_samp_factor = (hsamp), \
compptr->v_samp_factor = (vsamp), \
compptr->quant_tbl_no = (quant), \
compptr->dc_tbl_no = (dctbl), \
compptr->ac_tbl_no = (actbl) )
/* Safety check to ensure start_compress not called yet. */
if (cinfo->global_state != CSTATE_START)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
/* For all colorspaces, we use Q and Huff tables 0 for luminance components,
* tables 1 for chrominance components.
*/
cinfo->jpeg_color_space = colorspace;
cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */
cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */
/* Fix the bit width stuff here, by now cinfo->data_precision should be set */
if (2 > cinfo->data_precision || cinfo->data_precision > 16)
ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
if (!cinfo->lossless) {
if (cinfo->data_precision <=8) {
if (cinfo->data_precision !=8) {
WARNMS2(cinfo, JWRN_JPEG_PRECISION_CHANGED, cinfo->data_precision, 8);
cinfo->data_precision = 8;
}
} else if (cinfo->data_precision != 12) {
WARNMS2(cinfo, JWRN_JPEG_PRECISION_CHANGED, cinfo->data_precision, 12);
cinfo->data_precision = 12;
}
}
cinfo->maxjsample = (1 << cinfo->data_precision) - 1;
cinfo->centerjsample = (cinfo->maxjsample + 1)/2;
#ifdef HAVE_GETJSAMPLE_MASK
cinfo->maskjsample = cinfo->maxjsample;
#endif
/* The standard Huffman tables are only valid for 8-bit data precision.
* If the precision is higher, force optimization on so that usable
* tables will be computed. This test can be removed if default tables
* are supplied that are valid for the desired precision.
*/
if (cinfo->data_precision != 8)
cinfo->optimize_coding = TRUE;
switch (colorspace) {
case JCS_GRAYSCALE:
cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
cinfo->num_components = 1;
/* JFIF specifies component ID 1 */
SET_COMP(0, 1, 1,1, 0, 0,0);
break;
case JCS_RGB:
cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */
cinfo->num_components = 3;
SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0);
SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0);
SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0);
break;
case JCS_YCbCr:
cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
cinfo->num_components = 3;
/* JFIF specifies component IDs 1,2,3 */
if (cinfo->lossless) {
SET_COMP(0, 1, 1,1, 0, 0,0);
SET_COMP(1, 2, 1,1, 1, 1,1);
SET_COMP(2, 3, 1,1, 1, 1,1);
} else { /* lossy */
/* We default to 2x2 subsamples of chrominance */
SET_COMP(0, 1, 2,2, 0, 0,0);
SET_COMP(1, 2, 1,1, 1, 1,1);
SET_COMP(2, 3, 1,1, 1, 1,1);
}
break;
case JCS_CMYK:
cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */
cinfo->num_components = 4;
SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0);
SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0);
SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0);
SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0);
break;
case JCS_YCCK:
cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */
cinfo->num_components = 4;
if (cinfo->lossless) {
SET_COMP(0, 1, 1,1, 0, 0,0);
SET_COMP(1, 2, 1,1, 1, 1,1);
SET_COMP(2, 3, 1,1, 1, 1,1);
SET_COMP(3, 4, 1,1, 0, 0,0);
} else { /* lossy */
SET_COMP(0, 1, 2,2, 0, 0,0);
SET_COMP(1, 2, 1,1, 1, 1,1);
SET_COMP(2, 3, 1,1, 1, 1,1);
SET_COMP(3, 4, 2,2, 0, 0,0);
}
break;
case JCS_UNKNOWN:
cinfo->num_components = cinfo->input_components;
if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS)
ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
MAX_COMPONENTS);
for (ci = 0; ci < cinfo->num_components; ci++) {
SET_COMP(ci, ci, 1,1, 0, 0,0);
}
break;
default:
ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
}
}