diff options
Diffstat (limited to 'converter/other/jpeg2000/libjasper/jp2/jp2_dec.c')
| -rw-r--r-- | converter/other/jpeg2000/libjasper/jp2/jp2_dec.c | 1032 |
1 files changed, 525 insertions, 507 deletions
diff --git a/converter/other/jpeg2000/libjasper/jp2/jp2_dec.c b/converter/other/jpeg2000/libjasper/jp2/jp2_dec.c index 91ce6c51..a9463a57 100644 --- a/converter/other/jpeg2000/libjasper/jp2/jp2_dec.c +++ b/converter/other/jpeg2000/libjasper/jp2/jp2_dec.c @@ -110,16 +110,6 @@ * __END_OF_JASPER_LICENSE__ */ -/* - * JP2 Library - * - * $Id$ - */ - -/******************************************************************************\ -* Includes. -\******************************************************************************/ - #include "jasper/jas_image.h" #include "jasper/jas_stream.h" #include "jasper/jas_math.h" @@ -130,520 +120,548 @@ #include "jp2_cod.h" #include "jp2_dec.h" -#define JP2_VALIDATELEN (JAS_MIN(JP2_JP_LEN + 16, JAS_STREAM_MAXPUTBACK)) - -static jp2_dec_t *jp2_dec_create(void); -static void jp2_dec_destroy(jp2_dec_t *dec); -static int jp2_getcs(jp2_colr_t *colr); -static int jp2_getct(int colorspace, int type, int assoc); -static int fromiccpcs(int cs); - -/******************************************************************************\ -* Functions. -\******************************************************************************/ - -jas_image_t *jp2_decode(jas_stream_t *in, char *optstr) -{ - jp2_box_t *box; - int found; - jas_image_t *image; - jp2_dec_t *dec; - bool samedtype; - int dtype; - int i; - jp2_cmap_t *cmapd; - jp2_pclr_t *pclrd; - jp2_cdef_t *cdefd; - int channo; - int newcmptno; - int_fast32_t *lutents; - jp2_cmapent_t *cmapent; - unsigned char *iccp; - int cs; - - dec = 0; - box = 0; - image = 0; - - if (!(dec = jp2_dec_create())) { - goto error; - } - - /* Get the first box. This should be a JP box. */ - if (!(box = jp2_box_get(in))) { - jas_eprintf("error: cannot get box\n"); - goto error; - } - if (box->type != JP2_BOX_JP) { - jas_eprintf("error: expecting signature box\n"); - goto error; - } - if (box->data.jp.magic != JP2_JP_MAGIC) { - jas_eprintf("incorrect magic number\n"); - goto error; - } - jp2_box_destroy(box); - box = 0; - - /* Get the second box. This should be a FTYP box. */ - if (!(box = jp2_box_get(in))) { - goto error; - } - if (box->type != JP2_BOX_FTYP) { - jas_eprintf("expecting file type box\n"); - goto error; - } - jp2_box_destroy(box); - box = 0; - - /* Get more boxes... */ - found = 0; - while ((box = jp2_box_get(in))) { - if (jas_getdbglevel() >= 1) { - fprintf(stderr, "box type %s\n", box->info->name); - } - switch (box->type) { - case JP2_BOX_JP2C: - found = 1; - break; - case JP2_BOX_IHDR: - if (!dec->ihdr) { - dec->ihdr = box; - box = 0; - } - break; - case JP2_BOX_BPCC: - if (!dec->bpcc) { - dec->bpcc = box; - box = 0; - } - break; - case JP2_BOX_CDEF: - if (!dec->cdef) { - dec->cdef = box; - box = 0; - } - break; - case JP2_BOX_PCLR: - if (!dec->pclr) { - dec->pclr = box; - box = 0; - } - break; - case JP2_BOX_CMAP: - if (!dec->cmap) { - dec->cmap = box; - box = 0; - } - break; - case JP2_BOX_COLR: - if (!dec->colr) { - dec->colr = box; - box = 0; - } - break; - } - if (box) { - jp2_box_destroy(box); - box = 0; - } - if (found) { - break; - } - } - - if (!found) { - jas_eprintf("error: no code stream found\n"); - goto error; - } - - if (!(dec->image = jpc_decode(in, optstr))) { - jas_eprintf("error: cannot decode code stream\n"); - goto error; - } - - /* An IHDR box must be present. */ - if (!dec->ihdr) { - jas_eprintf("error: missing IHDR box\n"); - goto error; - } - - /* Does the number of components indicated in the IHDR box match - the value specified in the code stream? */ - if (dec->ihdr->data.ihdr.numcmpts != jas_image_numcmpts(dec->image)) { - jas_eprintf("warning: number of components mismatch\n"); - } - - /* At least one component must be present. */ - if (!jas_image_numcmpts(dec->image)) { - jas_eprintf("error: no components\n"); - goto error; - } - - /* Determine if all components have the same data type. */ - samedtype = true; - dtype = jas_image_cmptdtype(dec->image, 0); - for (i = 1; i < jas_image_numcmpts(dec->image); ++i) { - if (jas_image_cmptdtype(dec->image, i) != dtype) { - samedtype = false; - break; - } - } - - /* Is the component data type indicated in the IHDR box consistent - with the data in the code stream? */ - if ((samedtype && dec->ihdr->data.ihdr.bpc != JP2_DTYPETOBPC(dtype)) || - (!samedtype && dec->ihdr->data.ihdr.bpc != JP2_IHDR_BPCNULL)) { - jas_eprintf("warning: component data type mismatch\n"); - } - - /* Can we handle the compression type? */ - if (dec->ihdr->data.ihdr.comptype != JP2_IHDR_COMPTYPE) { - jas_eprintf("error: not capable of this compression type\n"); - goto error; - } - - if (dec->bpcc) { - /* Is the number of components indicated in the BPCC box - consistent with the code stream data? */ - if (dec->bpcc->data.bpcc.numcmpts != jas_image_numcmpts( - dec->image)) { - jas_eprintf("warning: number of components mismatch\n"); - } - /* Is the component data type information indicated in the BPCC - box consistent with the code stream data? */ - if (!samedtype) { - for (i = 0; i < jas_image_numcmpts(dec->image); ++i) { - if (jas_image_cmptdtype(dec->image, i) != JP2_BPCTODTYPE(dec->bpcc->data.bpcc.bpcs[i])) { - jas_eprintf("warning: component data type mismatch\n"); - } - } - } else { - jas_eprintf("warning: superfluous BPCC box\n"); - } - } - - /* A COLR box must be present. */ - if (!dec->colr) { - jas_eprintf("error: no COLR box\n"); - goto error; - } - - switch (dec->colr->data.colr.method) { - case JP2_COLR_ENUM: - jas_image_setcolorspace(dec->image, jp2_getcs(&dec->colr->data.colr)); - break; - case JP2_COLR_ICC: - if (dec->colr->data.colr.iccplen < 128) { - abort(); - } - iccp = dec->colr->data.colr.iccp; - cs = (iccp[16] << 24) | (iccp[17] << 16) | (iccp[18] << 8) | - iccp[19]; - if (jas_getdbglevel() > 1) - jas_eprintf("ICC Profile CS %08x\n", cs); - jas_image_setcolorspace(dec->image, fromiccpcs(cs)); - break; - } - - /* If a CMAP box is present, a PCLR box must also be present. */ - if (dec->cmap && !dec->pclr) { - jas_eprintf("warning: missing PCLR box or superfluous CMAP box\n"); - jp2_box_destroy(dec->cmap); - dec->cmap = 0; - } - - /* If a CMAP box is not present, a PCLR box must not be present. */ - if (!dec->cmap && dec->pclr) { - jas_eprintf("warning: missing CMAP box or superfluous PCLR box\n"); - jp2_box_destroy(dec->pclr); - dec->pclr = 0; - } - - /* Determine the number of channels (which is essentially the number - of components after any palette mappings have been applied). */ - dec->numchans = dec->cmap ? dec->cmap->data.cmap.numchans : jas_image_numcmpts(dec->image); - - /* Perform a basic sanity check on the CMAP box if present. */ - if (dec->cmap) { - for (i = 0; i < dec->numchans; ++i) { - /* Is the component number reasonable? */ - if (dec->cmap->data.cmap.ents[i].cmptno >= jas_image_numcmpts(dec->image)) { - jas_eprintf("error: invalid component number in CMAP box\n"); - goto error; - } - /* Is the LUT index reasonable? */ - if (dec->cmap->data.cmap.ents[i].pcol >= dec->pclr->data.pclr.numchans) { - jas_eprintf("error: invalid CMAP LUT index\n"); - goto error; - } - } - } - - /* Allocate space for the channel-number to component-number LUT. */ - if (!(dec->chantocmptlut = jas_malloc(dec->numchans * sizeof(uint_fast16_t)))) { - jas_eprintf("error: no memory\n"); - goto error; - } - - if (!dec->cmap) { - for (i = 0; i < dec->numchans; ++i) { - dec->chantocmptlut[i] = i; - } - } else { - cmapd = &dec->cmap->data.cmap; - pclrd = &dec->pclr->data.pclr; - cdefd = &dec->cdef->data.cdef; - for (channo = 0; channo < cmapd->numchans; ++channo) { - cmapent = &cmapd->ents[channo]; - if (cmapent->map == JP2_CMAP_DIRECT) { - dec->chantocmptlut[channo] = channo; - } else if (cmapent->map == JP2_CMAP_PALETTE) { - lutents = jas_malloc(pclrd->numlutents * sizeof(int_fast32_t)); - for (i = 0; i < pclrd->numlutents; ++i) { - lutents[i] = pclrd->lutdata[cmapent->pcol + i * pclrd->numchans]; - } - newcmptno = jas_image_numcmpts(dec->image); - jas_image_depalettize(dec->image, cmapent->cmptno, pclrd->numlutents, lutents, JP2_BPCTODTYPE(pclrd->bpc[cmapent->pcol]), newcmptno); - dec->chantocmptlut[channo] = newcmptno; - jas_free(lutents); -#if 0 - if (dec->cdef) { - cdefent = jp2_cdef_lookup(cdefd, channo); - if (!cdefent) { - abort(); - } - jas_image_setcmpttype(dec->image, newcmptno, jp2_getct(jas_image_colorspace(dec->image), cdefent->type, cdefent->assoc)); - } else { - jas_image_setcmpttype(dec->image, newcmptno, jp2_getct(jas_image_colorspace(dec->image), 0, channo + 1)); - } -#endif - } - } - } - - /* Mark all components as being of unknown type. */ - - for (i = 0; i < jas_image_numcmpts(dec->image); ++i) { - jas_image_setcmpttype(dec->image, i, JAS_IMAGE_CT_UNKNOWN); - } - - /* Determine the type of each component. */ - if (dec->cdef) { - for (i = 0; i < dec->numchans; ++i) { - jas_image_setcmpttype(dec->image, - dec->chantocmptlut[dec->cdef->data.cdef.ents[i].channo], - jp2_getct(jas_image_colorspace(dec->image), - dec->cdef->data.cdef.ents[i].type, dec->cdef->data.cdef.ents[i].assoc)); - } - } else { - for (i = 0; i < dec->numchans; ++i) { - jas_image_setcmpttype(dec->image, dec->chantocmptlut[i], - jp2_getct(jas_image_colorspace(dec->image), 0, i + 1)); - } - } - - /* Delete any components that are not of interest. */ - for (i = jas_image_numcmpts(dec->image) - 1; i >= 0; --i) { - if (jas_image_cmpttype(dec->image, i) == JAS_IMAGE_CT_UNKNOWN) { - jas_image_delcmpt(dec->image, i); - } - } - - /* Ensure that some components survived. */ - if (!jas_image_numcmpts(dec->image)) { - jas_eprintf("error: no components\n"); - goto error; - } - - /* Prevent the image from being destroyed later. */ - image = dec->image; - dec->image = 0; - - jp2_dec_destroy(dec); - - return image; +#define JP2_VALIDATELEN (JAS_MIN(JP2_JP_LEN + 16, JAS_STREAM_MAXPUTBACK)) -error: - if (box) { - jp2_box_destroy(box); - } - if (dec) { - jp2_dec_destroy(dec); - } - return 0; + + +static jp2_dec_t * +jp2_dec_create(void) { + + jp2_dec_t *dec; + + dec = jas_malloc(sizeof(jp2_dec_t)); + if (dec) { + dec->ihdr = 0; + dec->bpcc = 0; + dec->cdef = 0; + dec->pclr = 0; + dec->image = 0; + dec->chantocmptlut = 0; + dec->cmap = 0; + dec->colr = 0; + } + return dec; } -int jp2_validate(jas_stream_t *in) -{ - char buf[JP2_VALIDATELEN]; - int i; - int n; - - assert(JAS_STREAM_MAXPUTBACK >= JP2_VALIDATELEN); - - /* Read the validation data (i.e., the data used for detecting - the format). */ - if ((n = jas_stream_read(in, buf, JP2_VALIDATELEN)) < 0) { - return -1; - } - - /* Put the validation data back onto the stream, so that the - stream position will not be changed. */ - for (i = n - 1; i >= 0; --i) { - if (jas_stream_ungetc(in, buf[i]) == EOF) { - return -1; - } - } - - /* Did we read enough data? */ - if (n < JP2_VALIDATELEN) { - return -1; - } - - /* Is the box type correct? */ - if (((buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]) != - JP2_BOX_JP) - { - return -1; - } - - return 0; + + +static void +jp2_dec_destroy(jp2_dec_t *dec) { + + if (dec->ihdr) + jp2_box_destroy(dec->ihdr); + + if (dec->bpcc) + jp2_box_destroy(dec->bpcc); + + if (dec->cdef) + jp2_box_destroy(dec->cdef); + + if (dec->pclr) + jp2_box_destroy(dec->pclr); + + if (dec->image) + jas_image_destroy(dec->image); + + if (dec->cmap) + jp2_box_destroy(dec->cmap); + + if (dec->colr) + jp2_box_destroy(dec->colr); + + if (dec->chantocmptlut) + jas_free(dec->chantocmptlut); + + jas_free(dec); } -static jp2_dec_t *jp2_dec_create(void) -{ - jp2_dec_t *dec; - - if (!(dec = jas_malloc(sizeof(jp2_dec_t)))) { - return 0; - } - dec->ihdr = 0; - dec->bpcc = 0; - dec->cdef = 0; - dec->pclr = 0; - dec->image = 0; - dec->chantocmptlut = 0; - dec->cmap = 0; - dec->colr = 0; - return dec; + + +static int +jp2_getct(int colorspace, int type, int assoc) { + + if (type == 1 && assoc == 0) + return JAS_IMAGE_CT_OPACITY; + + if (type == 0 && assoc >= 1 && assoc <= 65534) { + switch (colorspace) { + case JAS_IMAGE_CS_RGB: + switch (assoc) { + case JP2_CDEF_RGB_R: + return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_RGB_R); + break; + case JP2_CDEF_RGB_G: + return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_RGB_G); + break; + case JP2_CDEF_RGB_B: + return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_RGB_B); + break; + } + break; + case JAS_IMAGE_CS_YCBCR: + switch (assoc) { + case JP2_CDEF_YCBCR_Y: + return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_YCBCR_Y); + break; + case JP2_CDEF_YCBCR_CB: + return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_YCBCR_CB); + break; + case JP2_CDEF_YCBCR_CR: + return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_YCBCR_CR); + break; + } + break; + case JAS_IMAGE_CS_GRAY: + switch (assoc) { + case JP2_CDEF_GRAY_Y: + return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_GRAY_Y); + break; + } + break; +#if 0 + case JAS_IMAGE_CS_ICC: +#endif + default: + return JAS_IMAGE_CT_COLOR(assoc - 1); + break; + } + } + return JAS_IMAGE_CT_UNKNOWN; } -static void jp2_dec_destroy(jp2_dec_t *dec) -{ - if (dec->ihdr) { - jp2_box_destroy(dec->ihdr); - } - if (dec->bpcc) { - jp2_box_destroy(dec->bpcc); - } - if (dec->cdef) { - jp2_box_destroy(dec->cdef); - } - if (dec->pclr) { - jp2_box_destroy(dec->pclr); - } - if (dec->image) { - jas_image_destroy(dec->image); - } - if (dec->cmap) { - jp2_box_destroy(dec->cmap); - } - if (dec->colr) { - jp2_box_destroy(dec->colr); - } - if (dec->chantocmptlut) { - jas_free(dec->chantocmptlut); - } - jas_free(dec); + + +static int +jp2_getcs(jp2_colr_t *colr) { + + if (colr->method == JP2_COLR_ENUM) { + switch (colr->csid) { + case JP2_COLR_SRGB: + return JAS_IMAGE_CS_RGB; + break; + case JP2_COLR_SYCC: + return JAS_IMAGE_CS_YCBCR; + break; + case JP2_COLR_SGRAY: + return JAS_IMAGE_CS_GRAY; + break; + } + } + return JAS_IMAGE_CS_UNKNOWN; } +static int +fromiccpcs(int cs) { + + switch (cs) { + case ICC_CS_RGB: + return JAS_IMAGE_CS_RGB; + break; + case ICC_CS_YCBCR: + return JAS_IMAGE_CS_YCBCR; + break; + case ICC_CS_GRAY: + return JAS_IMAGE_CS_GRAY; + break; + } + return JAS_IMAGE_CS_UNKNOWN; +} -static int jp2_getct(int colorspace, int type, int assoc) -{ - if (type == 1 && assoc == 0) { - return JAS_IMAGE_CT_OPACITY; - } - if (type == 0 && assoc >= 1 && assoc <= 65534) { - switch (colorspace) { - case JAS_IMAGE_CS_RGB: - switch (assoc) { - case JP2_CDEF_RGB_R: - return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_RGB_R); - break; - case JP2_CDEF_RGB_G: - return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_RGB_G); - break; - case JP2_CDEF_RGB_B: - return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_RGB_B); - break; - } - break; - case JAS_IMAGE_CS_YCBCR: - switch (assoc) { - case JP2_CDEF_YCBCR_Y: - return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_YCBCR_Y); - break; - case JP2_CDEF_YCBCR_CB: - return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_YCBCR_CB); - break; - case JP2_CDEF_YCBCR_CR: - return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_YCBCR_CR); - break; - } - break; - case JAS_IMAGE_CS_GRAY: - switch (assoc) { - case JP2_CDEF_GRAY_Y: - return JAS_IMAGE_CT_COLOR(JAS_IMAGE_CT_GRAY_Y); - break; - } - break; +jas_image_t * +jp2_decode(jas_stream_t *in, char *optstr) { + + jp2_box_t *box; + int found; + jas_image_t *image; + jp2_dec_t *dec; + bool samedtype; + int dtype; + int i; + jp2_cmap_t *cmapd; + jp2_pclr_t *pclrd; + int channo; + int newcmptno; + int_fast32_t *lutents; + jp2_cmapent_t *cmapent; + unsigned char *iccp; + int cs; + + dec = 0; + box = 0; + image = 0; + + if (!(dec = jp2_dec_create())) { + goto error; + } + + /* Get the first box. This should be a JP box. */ + if (!(box = jp2_box_get(in))) { + jas_eprintf("error: cannot get box\n"); + goto error; + } + if (box->type != JP2_BOX_JP) { + jas_eprintf("error: expecting signature box\n"); + goto error; + } + if (box->data.jp.magic != JP2_JP_MAGIC) { + jas_eprintf("incorrect magic number\n"); + goto error; + } + jp2_box_destroy(box); + box = 0; + + /* Get the second box. This should be a FTYP box. */ + if (!(box = jp2_box_get(in))) { + goto error; + } + if (box->type != JP2_BOX_FTYP) { + jas_eprintf("expecting file type box\n"); + goto error; + } + jp2_box_destroy(box); + box = 0; + + /* Get more boxes... */ + found = 0; + while ((box = jp2_box_get(in))) { + if (jas_getdbglevel() >= 1) { + fprintf(stderr, "box type %s\n", box->info->name); + } + switch (box->type) { + case JP2_BOX_JP2C: + found = 1; + break; + case JP2_BOX_IHDR: + if (!dec->ihdr) { + dec->ihdr = box; + box = 0; + } + break; + case JP2_BOX_BPCC: + if (!dec->bpcc) { + dec->bpcc = box; + box = 0; + } + break; + case JP2_BOX_CDEF: + if (!dec->cdef) { + dec->cdef = box; + box = 0; + } + break; + case JP2_BOX_PCLR: + if (!dec->pclr) { + dec->pclr = box; + box = 0; + } + break; + case JP2_BOX_CMAP: + if (!dec->cmap) { + dec->cmap = box; + box = 0; + } + break; + case JP2_BOX_COLR: + if (!dec->colr) { + dec->colr = box; + box = 0; + } + break; + } + if (box) { + jp2_box_destroy(box); + box = 0; + } + if (found) { + break; + } + } + + if (!found) { + jas_eprintf("error: no code stream found\n"); + goto error; + } + + if (!(dec->image = jpc_decode(in, optstr))) { + jas_eprintf("error: cannot decode code stream\n"); + goto error; + } + + /* An IHDR box must be present. */ + if (!dec->ihdr) { + jas_eprintf("error: missing IHDR box\n"); + goto error; + } + + /* Does the number of components indicated in the IHDR box match + the value specified in the code stream? */ + if (dec->ihdr->data.ihdr.numcmpts != jas_image_numcmpts(dec->image)) { + jas_eprintf("warning: number of components mismatch\n"); + } + + /* At least one component must be present. */ + if (!jas_image_numcmpts(dec->image)) { + jas_eprintf("error: no components\n"); + goto error; + } + + /* Determine if all components have the same data type. */ + samedtype = true; + dtype = jas_image_cmptdtype(dec->image, 0); + for (i = 1; i < jas_image_numcmpts(dec->image); ++i) { + if (jas_image_cmptdtype(dec->image, i) != dtype) { + samedtype = false; + break; + } + } + + /* Is the component data type indicated in the IHDR box consistent + with the data in the code stream? */ + if ((samedtype && dec->ihdr->data.ihdr.bpc != JP2_DTYPETOBPC(dtype)) || + (!samedtype && dec->ihdr->data.ihdr.bpc != JP2_IHDR_BPCNULL)) { + jas_eprintf("warning: component data type mismatch\n"); + } + + /* Can we handle the compression type? */ + if (dec->ihdr->data.ihdr.comptype != JP2_IHDR_COMPTYPE) { + jas_eprintf("error: not capable of this compression type\n"); + goto error; + } + + if (dec->bpcc) { + /* Is the number of components indicated in the BPCC box + consistent with the code stream data? */ + if (dec->bpcc->data.bpcc.numcmpts != jas_image_numcmpts( + dec->image)) { + jas_eprintf("warning: number of components mismatch\n"); + } + /* Is the component data type information indicated in the BPCC + box consistent with the code stream data? */ + if (!samedtype) { + for (i = 0; i < jas_image_numcmpts(dec->image); ++i) { + if (jas_image_cmptdtype(dec->image, i) != + JP2_BPCTODTYPE(dec->bpcc->data.bpcc.bpcs[i])) { + jas_eprintf("warning: component data type mismatch\n"); + } + } + } else { + jas_eprintf("warning: superfluous BPCC box\n"); + } + } + + /* A COLR box must be present. */ + if (!dec->colr) { + jas_eprintf("error: no COLR box\n"); + goto error; + } + + switch (dec->colr->data.colr.method) { + case JP2_COLR_ENUM: + jas_image_setcolorspace(dec->image, jp2_getcs(&dec->colr->data.colr)); + break; + case JP2_COLR_ICC: + if (dec->colr->data.colr.iccplen < 128) { + abort(); + } + iccp = dec->colr->data.colr.iccp; + cs = (iccp[16] << 24) | (iccp[17] << 16) | (iccp[18] << 8) | + iccp[19]; + if (jas_getdbglevel() > 1) + jas_eprintf("ICC Profile CS %08x\n", cs); + jas_image_setcolorspace(dec->image, fromiccpcs(cs)); + break; + } + + /* If a CMAP box is present, a PCLR box must also be present. */ + if (dec->cmap && !dec->pclr) { + jas_eprintf("warning: missing PCLR box or superfluous CMAP box\n"); + jp2_box_destroy(dec->cmap); + dec->cmap = 0; + } + + /* If a CMAP box is not present, a PCLR box must not be present. */ + if (!dec->cmap && dec->pclr) { + jas_eprintf("warning: missing CMAP box or superfluous PCLR box\n"); + jp2_box_destroy(dec->pclr); + dec->pclr = 0; + } + + /* Determine the number of channels (which is essentially the number + of components after any palette mappings have been applied). */ + dec->numchans = dec->cmap ? + dec->cmap->data.cmap.numchans : + jas_image_numcmpts(dec->image); + + /* Perform a basic sanity check on the CMAP box if present. */ + if (dec->cmap) { + for (i = 0; i < dec->numchans; ++i) { + /* Is the component number reasonable? */ + if (dec->cmap->data.cmap.ents[i].cmptno >= + jas_image_numcmpts(dec->image)) { + jas_eprintf("error: invalid component number in CMAP box\n"); + goto error; + } + /* Is the LUT index reasonable? */ + if (dec->cmap->data.cmap.ents[i].pcol >= + dec->pclr->data.pclr.numchans) { + jas_eprintf("error: invalid CMAP LUT index\n"); + goto error; + } + } + } + + /* Allocate space for the channel-number to component-number LUT. */ + dec->chantocmptlut = jas_malloc(dec->numchans * sizeof(uint_fast16_t)); + if (!dec->chantocmptlut) { + jas_eprintf("error: no memory\n"); + goto error; + } + + if (!dec->cmap) { + for (i = 0; i < dec->numchans; ++i) { + dec->chantocmptlut[i] = i; + } + } else { + cmapd = &dec->cmap->data.cmap; + pclrd = &dec->pclr->data.pclr; + for (channo = 0; channo < cmapd->numchans; ++channo) { + cmapent = &cmapd->ents[channo]; + if (cmapent->map == JP2_CMAP_DIRECT) { + dec->chantocmptlut[channo] = channo; + } else if (cmapent->map == JP2_CMAP_PALETTE) { + lutents = jas_malloc(pclrd->numlutents * sizeof(int_fast32_t)); + for (i = 0; i < pclrd->numlutents; ++i) { + lutents[i] = + pclrd->lutdata[cmapent->pcol + i * pclrd->numchans]; + } + newcmptno = jas_image_numcmpts(dec->image); + jas_image_depalettize( + dec->image, cmapent->cmptno, pclrd->numlutents, lutents, + JP2_BPCTODTYPE(pclrd->bpc[cmapent->pcol]), newcmptno); + dec->chantocmptlut[channo] = newcmptno; + jas_free(lutents); #if 0 - case JAS_IMAGE_CS_ICC: + if (dec->cdef) { + jp2_cdef_t * const cdefd = &dec->cdef->data.cdef; + cdefent = jp2_cdef_lookup(cdefd, channo); + if (!cdefent) { + abort(); + } + jas_image_setcmpttype( + dec->image, newcmptno, + jp2_getct(jas_image_colorspace(dec->image), + cdefent->type, cdefent->assoc)); + } else { + jas_image_setcmpttype( + dec->image, newcmptno, + jp2_getct(jas_image_colorspace(dec->image), + 0, + channo + 1)); + } #endif - default: - return JAS_IMAGE_CT_COLOR(assoc - 1); - break; - } - } - return JAS_IMAGE_CT_UNKNOWN; -} + } + } + } + + /* Mark all components as being of unknown type. */ + + for (i = 0; i < jas_image_numcmpts(dec->image); ++i) { + jas_image_setcmpttype(dec->image, i, JAS_IMAGE_CT_UNKNOWN); + } + + /* Determine the type of each component. */ + if (dec->cdef) { + unsigned int i; + for (i = 0; i < dec->numchans; ++i) { + jas_image_setcmpttype( + dec->image, + dec->chantocmptlut[dec->cdef->data.cdef.ents[i].channo], + jp2_getct(jas_image_colorspace(dec->image), + dec->cdef->data.cdef.ents[i].type, + dec->cdef->data.cdef.ents[i].assoc)); + } + } else { + unsigned int i; + for (i = 0; i < dec->numchans; ++i) { + jas_image_setcmpttype(dec->image, dec->chantocmptlut[i], + jp2_getct(jas_image_colorspace(dec->image), 0, i + 1)); + } + } + + /* Delete any components that are not of interest. */ + for (i = jas_image_numcmpts(dec->image) - 1; i >= 0; --i) { + if (jas_image_cmpttype(dec->image, i) == JAS_IMAGE_CT_UNKNOWN) { + jas_image_delcmpt(dec->image, i); + } + } + + /* Ensure that some components survived. */ + if (!jas_image_numcmpts(dec->image)) { + jas_eprintf("error: no components\n"); + goto error; + } + + /* Prevent the image from being destroyed later. */ + image = dec->image; + dec->image = 0; + + jp2_dec_destroy(dec); + + return image; -static int jp2_getcs(jp2_colr_t *colr) -{ - if (colr->method == JP2_COLR_ENUM) { - switch (colr->csid) { - case JP2_COLR_SRGB: - return JAS_IMAGE_CS_RGB; - break; - case JP2_COLR_SYCC: - return JAS_IMAGE_CS_YCBCR; - break; - case JP2_COLR_SGRAY: - return JAS_IMAGE_CS_GRAY; - break; - } - } - return JAS_IMAGE_CS_UNKNOWN; +error: + if (box) { + jp2_box_destroy(box); + } + if (dec) { + jp2_dec_destroy(dec); + } + return 0; } -static int fromiccpcs(int cs) -{ - switch (cs) { - case ICC_CS_RGB: - return JAS_IMAGE_CS_RGB; - break; - case ICC_CS_YCBCR: - return JAS_IMAGE_CS_YCBCR; - break; - case ICC_CS_GRAY: - return JAS_IMAGE_CS_GRAY; - break; - } - return JAS_IMAGE_CS_UNKNOWN; + + +int +jp2_validate(jas_stream_t *in) { + + char buf[JP2_VALIDATELEN]; + int i; + int n; + + assert(JAS_STREAM_MAXPUTBACK >= JP2_VALIDATELEN); + + /* Read the validation data (i.e., the data used for detecting + the format). */ + if ((n = jas_stream_read(in, buf, JP2_VALIDATELEN)) < 0) { + return -1; + } + + /* Put the validation data back onto the stream, so that the + stream position will not be changed. */ + for (i = n - 1; i >= 0; --i) { + if (jas_stream_ungetc(in, buf[i]) == EOF) { + return -1; + } + } + + /* Did we read enough data? */ + if (n < JP2_VALIDATELEN) { + return -1; + } + + /* Is the box type correct? */ + if (((buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]) != + JP2_BOX_JP) + { + return -1; + } + + return 0; } + + + |