#endif
/* 2.0 didn't define OPJ_VERSION_MINOR. */
#ifndef OPJ_VERSION_MINOR
#define OPJ_VERSION_MINOR 0
#endif
/* Static generator of opj_stream from file stream.
* In 2.0.1, this functionality is provided by
* opj_stream_create_default_file_stream(),
* but it was removed in 2.1.0. Because we must have either
* a file stream or a memory interface to the compressed data,
* it is necessary to recreate the stream interface here. */
static opj_stream_t *opjCreateStream(FILE *fp, l_int32 is_read);
/* Static converter pix --> opj_image. Used for compressing pix,
* because the codec works on data stored in their raster format. */
static opj_image_t *pixConvertToOpjImage(PIX *pix);
/*---------------------------------------------------------------------*
* Callback event handlers *
*---------------------------------------------------------------------*/
static void error_callback(const char *msg, void *client_data) {
(void)client_data;
fprintf(stdout, "[ERROR] %s", msg);
}
static void warning_callback(const char *msg, void *client_data) {
(void)client_data;
fprintf(stdout, "[WARNING] %s", msg);
}
static void info_callback(const char *msg, void *client_data) {
(void)client_data;
fprintf(stdout, "[INFO] %s", msg);
}
/*---------------------------------------------------------------------*
* Read jp2k from file (special function) *
*---------------------------------------------------------------------*/
/*!
* \brief pixReadJp2k()
*
* \param[in] filename
* \param[in] reduction scaling factor: 1, 2, 4, 8, 16
* \param[in] box [optional] for extracting a subregion, can be null
* \param[in] hint a bitwise OR of L_JP2K_* values; 0 for default
* \param[in] debug output callback messages, etc
* \return pix 8 or 32 bpp, or NULL on error
*
*
* Notes:
* (1) This is a special function for reading jp2k files.
* The high-level pixReadStream() uses default values:
* %reduction = 1
* %box = NULL
* (2) This decodes at either full resolution or at a reduction by
* a power of 2. The default value %reduction == 1 gives a full
* resolution image. Use %reduction > 1 to get a reduced image.
* The actual values of %reduction that can be used on an image
* depend on the number of resolution levels chosen when the
* image was compressed. Typical values might be 1, 2, 4, 8 and 16.
* Using a value representing a reduction level that was not
* stored when the file was written will fail with the message:
* "failed to read the header".
* (3) Use %box to decode only a part of the image. The box is defined
* at full resolution. It is reduced internally by %reduction,
* and clipping to the right and bottom of the image is automatic.
* (4) We presently only handle images with 8 bits/sample (bps).
* If the image has 16 bps, the read will fail.
* (5) There are 4 possible values of samples/pixel (spp).
* The values in brackets give the pixel values in the Pix:
* spp = 1 ==> grayscale [8 bpp grayscale]
* spp = 2 ==> grayscale + alpha [32 bpp rgba]
* spp = 3 ==> rgb [32 bpp rgb]
* spp = 4 ==> rgba [32 bpp rgba]
* (6) The %hint parameter is reserved for future use.
*
*/
PIX *
pixReadJp2k(const char *filename,
l_uint32 reduction,
BOX *box,
l_int32 hint,
l_int32 debug)
{
FILE *fp;
PIX *pix;
PROCNAME("pixReadJp2k");
if (!filename)
return (PIX *)ERROR_PTR("filename not defined", procName, NULL);
if ((fp = fopenReadStream(filename)) == NULL)
return (PIX *)ERROR_PTR("image file not found", procName, NULL);
pix = pixReadStreamJp2k(fp, reduction, box, hint, debug);
fclose(fp);
if (!pix)
return (PIX *)ERROR_PTR("image not returned", procName, NULL);
return pix;
}
/*!
* \brief pixReadStreamJp2k()
*
* \param[in] fp file stream
* \param[in] reduction scaling factor: 1, 2, 4, 8
* \param[in] box [optional] for extracting a subregion, can be null
* \param[in] hint a bitwise OR of L_JP2K_* values; 0 for default
* \param[in] debug output callback messages, etc
* \return pix 8 or 32 bpp, or NULL on error
*
*
* Notes:
* (1) See pixReadJp2k() for usage.
*
*/
PIX *
pixReadStreamJp2k(FILE *fp,
l_uint32 reduction,
BOX *box,
l_int32 hint,
l_int32 debug)
{
const char *opjVersion;
l_int32 i, j, index, bx, by, bw, bh, val, rval, gval, bval, aval;
l_int32 w, h, wpl, bps, spp, xres, yres, reduce, prec, colorspace;
l_uint32 pixel;
l_uint32 *data, *line;
opj_dparameters_t parameters; /* decompression parameters */
opj_image_t *image = NULL;
opj_codec_t *l_codec = NULL; /* handle to decompressor */
opj_stream_t *l_stream = NULL; /* opj stream */
PIX *pix = NULL;
PROCNAME("pixReadStreamJp2k");
if (!fp)
return (PIX *)ERROR_PTR("fp not defined", procName, NULL);
opjVersion = opj_version();
if (opjVersion[0] != '2') {
L_ERROR("version is %s; must be 2.0 or higher\n", procName, opjVersion);
return NULL;
}
if ((opjVersion[2] - 0x30) != OPJ_VERSION_MINOR) {
L_ERROR("version %s: differs from minor = %d\n",
procName, opjVersion, OPJ_VERSION_MINOR);
return NULL;
}
/* Get the resolution and the bits/sample */
rewind(fp);
fgetJp2kResolution(fp, &xres, &yres);
freadHeaderJp2k(fp, NULL, NULL, &bps, NULL);
rewind(fp);
if (bps > 8) {
L_ERROR("found %d bps; can only handle 8 bps\n", procName, bps);
return NULL;
}
/* Set decoding parameters to default values */
opj_set_default_decoder_parameters(¶meters);
/* Find and set the reduce parameter, which is log2(reduction).
* Valid reductions are powers of 2, and are determined when the
* compressed string is made. A request for an invalid reduction
* will cause an error in opj_read_header(), and no image will
* be returned. */
for (reduce = 0; (1L << reduce) < reduction; reduce++) { }
if ((1L << reduce) != reduction) {
L_ERROR("invalid reduction %d; not power of 2\n", procName, reduction);
return NULL;
}
parameters.cp_reduce = reduce;
/* Get a decoder handle */
if ((l_codec = opj_create_decompress(OPJ_CODEC_JP2)) == NULL) {
L_ERROR("failed to make the codec\n", procName);
return NULL;
}
/* Catch and report events using callbacks */
if (debug) {
opj_set_info_handler(l_codec, info_callback, NULL);
opj_set_warning_handler(l_codec, warning_callback, NULL);
opj_set_error_handler(l_codec, error_callback, NULL);
}
/* Setup the decoding parameters using user parameters */
if (!opj_setup_decoder(l_codec, ¶meters)){
L_ERROR("failed to set up decoder\n", procName);
opj_destroy_codec(l_codec);
return NULL;
}
/* Open decompression 'stream'. In 2.0, we could call this:
* opj_stream_create_default_file_stream(fp, 1)
* but the file stream interface was removed in 2.1. */
if ((l_stream = opjCreateStream(fp, 1)) == NULL) {
L_ERROR("failed to open the stream\n", procName);
opj_destroy_codec(l_codec);
return NULL;
}
/* Read the main header of the codestream and, if necessary,
* the JP2 boxes */
if(!opj_read_header(l_stream, l_codec, &image)){
L_ERROR("failed to read the header\n", procName);
opj_stream_destroy(l_stream);
opj_destroy_codec(l_codec);
opj_image_destroy(image);
return NULL;
}
/* Set up to decode a rectangular region */
if (box) {
boxGetGeometry(box, &bx, &by, &bw, &bh);
if (!opj_set_decode_area(l_codec, image, bx, by,
bx + bw, by + bh)) {
L_ERROR("failed to set the region for decoding\n", procName);
opj_stream_destroy(l_stream);
opj_destroy_codec(l_codec);
opj_image_destroy(image);
return NULL;
}
}
/* Get the decoded image */
if (!(opj_decode(l_codec, l_stream, image) &&
opj_end_decompress(l_codec, l_stream))) {
L_ERROR("failed to decode the image\n", procName);
opj_destroy_codec(l_codec);
opj_stream_destroy(l_stream);
opj_image_destroy(image);
return NULL;
}
/* Finished with the byte stream and the codec */
opj_stream_destroy(l_stream);
opj_destroy_codec(l_codec);
/* Get the image parameters */
spp = image->numcomps;
w = image->comps[0].w;
h = image->comps[0].h;
prec = image->comps[0].prec;
if (prec != bps)
L_WARNING("precision %d != bps %d!\n", procName, prec, bps);
if (debug) {
L_INFO("w = %d, h = %d, bps = %d, spp = %d\n",
procName, w, h, bps, spp);
colorspace = image->color_space;
if (colorspace == OPJ_CLRSPC_SRGB)
L_INFO("colorspace is sRGB\n", procName);
else if (colorspace == OPJ_CLRSPC_GRAY)
L_INFO("colorspace is grayscale\n", procName);
else if (colorspace == OPJ_CLRSPC_SYCC)
L_INFO("colorspace is YUV\n", procName);
}
/* Convert the image to a pix */
if (spp == 1)
pix = pixCreate(w, h, 8);
else
pix = pixCreate(w, h, 32);
pixSetInputFormat(pix, IFF_JP2);
pixSetResolution(pix, xres, yres);
data = pixGetData(pix);
wpl = pixGetWpl(pix);
index = 0;
if (spp == 1) {
for (i = 0; i < h; i++) {
line = data + i * wpl;
for (j = 0; j < w; j++) {
val = image->comps[0].data[index];
SET_DATA_BYTE(line, j, val);
index++;
}
}
} else if (spp == 2) { /* convert to RGBA */
for (i = 0; i < h; i++) {
line = data + i * wpl;
for (j = 0; j < w; j++) {
val = image->comps[0].data[index];
aval = image->comps[1].data[index];
composeRGBAPixel(val, val, val, aval, &pixel);
line[j] = pixel;
index++;
}
}
} else if (spp >= 3) {
for (i = 0; i < h; i++) {
line = data + i * wpl;
for (j = 0; j < w; j++) {
rval = image->comps[0].data[index];
gval = image->comps[1].data[index];
bval = image->comps[2].data[index];
if (spp == 3) {
composeRGBPixel(rval, gval, bval, &pixel);
} else { /* spp == 4 */
aval = image->comps[3].data[index];
composeRGBAPixel(rval, gval, bval, aval, &pixel);
}
line[j] = pixel;
index++;
}
}
}
/* Free the opj image data structure */
opj_image_destroy(image);
return pix;
}
/*---------------------------------------------------------------------*
* Write jp2k to file *
*---------------------------------------------------------------------*/
/*!
* \brief pixWriteJp2k()
*
* \param[in] filename
* \param[in] pix any depth, cmap is OK
* \param[in] quality SNR > 0; 0 for default (34); 100 for lossless
* \param[in] nlevels resolution levels; <= 10; default = 5
* \param[in] hint a bitwise OR of L_JP2K_* values; 0 for default
* \param[in] debug output callback messages, etc
* \return 0 if OK; 1 on error
*
*
* Notes:
* (1) The %quality parameter is the SNR. The useful range is narrow:
* SNR < 27 (terrible quality)
* SNR = 34 (default; approximately equivalent to jpeg quality 75)
* SNR = 40 (very high quality)
* SNR = 45 (nearly lossless)
* Use 0 for default; 100 for lossless.
* (2) The %nlevels parameter is the number of resolution levels
* to be written. For example, with nlevels == 5, images with
* reduction factors of 1, 2, 4, 8 and 16 are encoded, and retrieval
* is done at the level requested when reading. For default,
* use either 5 or 0.
* (3) The %hint parameter is not yet in use.
* (4) For now, we only support 1 "layer" for quality.
*
*/
l_ok
pixWriteJp2k(const char *filename,
PIX *pix,
l_int32 quality,
l_int32 nlevels,
l_int32 hint,
l_int32 debug)
{
FILE *fp;
PROCNAME("pixWriteJp2k");
if (!pix)
return ERROR_INT("pix not defined", procName, 1);
if (!filename)
return ERROR_INT("filename not defined", procName, 1);
if ((fp = fopenWriteStream(filename, "wb+")) == NULL)
return ERROR_INT("stream not opened", procName, 1);
if (pixWriteStreamJp2k(fp, pix, quality, nlevels, hint, debug)) {
fclose(fp);
return ERROR_INT("pix not written to stream", procName, 1);
}
fclose(fp);
return 0;
}
/*!
* \brief pixWriteStreamJp2k()
*
* \param[in] fp file stream
* \param[in] pix any depth, cmap is OK
* \param[in] quality SNR > 0; 0 for default (34); 100 for lossless
* \param[in] nlevels <= 10
* \param[in] hint a bitwise OR of L_JP2K_* values; 0 for default
* \param[in] debug output callback messages, etc
* \return 0 if OK, 1 on error
*
* Notes:
* (1) See pixWriteJp2k() for usage.
* (2) For an encoder with more encoding options, see, e.g.,
* https://github.com/OpenJPEG/openjpeg/blob/master/tests/test_tile_encoder.c
*
*/
l_ok
pixWriteStreamJp2k(FILE *fp,
PIX *pix,
l_int32 quality,
l_int32 nlevels,
l_int32 hint,
l_int32 debug)
{
l_int32 w, h, d, success;
l_float32 snr;
const char *opjVersion;
PIX *pixs;
opj_cparameters_t parameters; /* compression parameters */
opj_stream_t *l_stream = NULL;
opj_codec_t* l_codec = NULL;;
opj_image_t *image = NULL;
PROCNAME("pixWriteStreamJp2k");
if (!fp)
return ERROR_INT("stream not open", procName, 1);
if (!pix)
return ERROR_INT("pix not defined", procName, 1);
snr = (l_float32)quality;
if (snr <= 0) snr = 34.0; /* default */
if (snr < 27)
L_WARNING("SNR = %d < 27; very low\n", procName, (l_int32)snr);
if (snr == 100) snr = 0; /* for lossless */
if (snr > 45) {
L_WARNING("SNR > 45; using lossless encoding\n", procName);
snr = 0;
}
if (nlevels <= 0) nlevels = 5; /* default */
if (nlevels > 10) {
L_WARNING("nlevels = %d > 10; setting to 10\n", procName, nlevels);
nlevels = 10;
}
opjVersion = opj_version();
if (opjVersion[0] != '2') {
L_ERROR("version is %s; must be 2.0 or higher\n", procName, opjVersion);
return 1;
}
if ((opjVersion[2] - 0x30) != OPJ_VERSION_MINOR) {
L_ERROR("version %s: differs from minor = %d\n",
procName, opjVersion, OPJ_VERSION_MINOR);
return 1;
}
/* Remove colormap if it exists; result is 8 or 32 bpp */
pixGetDimensions(pix, &w, &h, &d);
if (d == 24) {
pixs = pixConvert24To32(pix);
} else if (d == 32) {
pixs = pixClone(pix);
} else if (pixGetColormap(pix) == NULL) {
pixs = pixConvertTo8(pix, 0);
} else { /* colormap */
L_INFO("removing colormap; may be better to compress losslessly\n",
procName);
pixs = pixRemoveColormap(pix, REMOVE_CMAP_BASED_ON_SRC);
}
/* Convert to opj image format. */
pixSetPadBits(pixs, 0);
image = pixConvertToOpjImage(pixs);
pixDestroy(&pixs);
/* Set encoding parameters to default values.
* We use one layer with the input SNR. */
opj_set_default_encoder_parameters(¶meters);
parameters.cp_fixed_quality = 1;
parameters.cp_disto_alloc = 0;
parameters.cp_fixed_alloc = 0;
parameters.tcp_distoratio[0] = snr;
parameters.tcp_numlayers = 1;
parameters.numresolution = nlevels;
/* Create comment for codestream */
if (parameters.cp_comment == NULL) {
const char comment1[] = "Created by Leptonica, version ";
const char comment2[] = "; using OpenJPEG, version ";
size_t len1 = strlen(comment1);
size_t len2 = strlen(comment2);
char *version1 = getLeptonicaVersion();
const char *version2 = opj_version();
len1 += len2 + strlen(version1) + strlen(version2) + 1;
parameters.cp_comment = (char *)LEPT_MALLOC(len1);
snprintf(parameters.cp_comment, len1, "%s%s%s%s", comment1, version1,
comment2, version2);
LEPT_FREE(version1);
}
/* Get the encoder handle */
if ((l_codec = opj_create_compress(OPJ_CODEC_JP2)) == NULL) {
opj_image_destroy(image);
LEPT_FREE(parameters.cp_comment);
return ERROR_INT("failed to get the encoder handle\n", procName, 1);
}
/* Catch and report events using callbacks */
if (debug) {
opj_set_info_handler(l_codec, info_callback, NULL);
opj_set_warning_handler(l_codec, warning_callback, NULL);
opj_set_error_handler(l_codec, error_callback, NULL);
}
/* Set up the encoder */
if (!opj_setup_encoder(l_codec, ¶meters, image)) {
opj_destroy_codec(l_codec);
opj_image_destroy(image);
LEPT_FREE(parameters.cp_comment);
return ERROR_INT("failed to set up the encoder\n", procName, 1);
}
/* Open a compression stream for writing. In 2.0 we could use this:
* opj_stream_create_default_file_stream(fp, 0)
* but the file stream interface was removed in 2.1. */
rewind(fp);
if ((l_stream = opjCreateStream(fp, 0)) == NULL) {
opj_destroy_codec(l_codec);
opj_image_destroy(image);
LEPT_FREE(parameters.cp_comment);
return ERROR_INT("failed to open l_stream\n", procName, 1);
}
/* Encode the image */
if (!opj_start_compress(l_codec, image, l_stream)) {
opj_stream_destroy(l_stream);
opj_destroy_codec(l_codec);
opj_image_destroy(image);
LEPT_FREE(parameters.cp_comment);
return ERROR_INT("opj_start_compress failed\n", procName, 1);
}
if (!opj_encode(l_codec, l_stream)) {
opj_stream_destroy(l_stream);
opj_destroy_codec(l_codec);
opj_image_destroy(image);
LEPT_FREE(parameters.cp_comment);
return ERROR_INT("opj_encode failed\n", procName, 1);
}
success = opj_end_compress(l_codec, l_stream);
/* Clean up */
opj_stream_destroy(l_stream);
opj_destroy_codec(l_codec);
opj_image_destroy(image);
LEPT_FREE(parameters.cp_comment);
if (success)
return 0;
else
return ERROR_INT("opj_end_compress failed\n", procName, 1);
}
/*!
* \brief pixConvertToOpjImage()
*
* \param[in] pix 8 or 32 bpp
* \return opj_image, or NULL on error
*
*
* Notes:
* (1) Input pix is 8 bpp grayscale, 32 bpp rgb, or 32 bpp rgba.
* (2) Gray + alpha pix are all represented as rgba.
*
*/
static opj_image_t *
pixConvertToOpjImage(PIX *pix)
{
l_int32 i, j, k, w, h, d, spp, wpl;
OPJ_COLOR_SPACE colorspace;
l_int32 *ir = NULL;
l_int32 *ig = NULL;
l_int32 *ib = NULL;
l_int32 *ia = NULL;
l_uint32 *line, *data;
opj_image_t *image;
opj_image_cmptparm_t cmptparm[4];
PROCNAME("pixConvertToOpjImage");
if (!pix)
return (opj_image_t *)ERROR_PTR("pix not defined", procName, NULL);
pixGetDimensions(pix, &w, &h, &d);
if (d != 8 && d != 32) {
L_ERROR("invalid depth: %d\n", procName, d);
return NULL;
}
/* Allocate the opj_image. */
spp = pixGetSpp(pix);
memset(&cmptparm[0], 0, 4 * sizeof(opj_image_cmptparm_t));
for (i = 0; i < spp; i++) {
cmptparm[i].prec = 8;
cmptparm[i].bpp = 8;
cmptparm[i].sgnd = 0;
cmptparm[i].dx = 1;
cmptparm[i].dy = 1;
cmptparm[i].w = w;
cmptparm[i].h = h;
}
colorspace = (spp == 1) ? OPJ_CLRSPC_GRAY : OPJ_CLRSPC_SRGB;
if ((image = opj_image_create(spp, &cmptparm[0], colorspace)) == NULL)
return (opj_image_t *)ERROR_PTR("image not made", procName, NULL);
image->x0 = 0;
image->y0 = 0;
image->x1 = w;
image->y1 = h;
/* Set the component pointers */
ir = image->comps[0].data;
if (spp > 1) {
ig = image->comps[1].data;
ib = image->comps[2].data;
}
if(spp == 4)
ia = image->comps[3].data;
/* Transfer the data from the pix */
data = pixGetData(pix);
wpl = pixGetWpl(pix);
for (i = 0, k = 0; i < h; i++) {
line = data + i * wpl;
for (j = 0; j < w; j++, k++) {
if (spp == 1) {
ir[k] = GET_DATA_BYTE(line, j);
} else if (spp > 1) {
ir[k] = GET_DATA_BYTE(line + j, COLOR_RED);
ig[k] = GET_DATA_BYTE(line + j, COLOR_GREEN);
ib[k] = GET_DATA_BYTE(line + j, COLOR_BLUE);
}
if (spp == 4)
ia[k] = GET_DATA_BYTE(line + j, L_ALPHA_CHANNEL);
}
}
return image;
}
/*---------------------------------------------------------------------*
* Read/write to memory *
*---------------------------------------------------------------------*/
/*!
* \brief pixReadMemJp2k()
*
* \param[in] data const; jpeg-encoded
* \param[in] size of data
* \param[in] reduction scaling factor: 1, 2, 4, 8
* \param[in] box [optional] for extracting a subregion, can be null
* \param[in] hint a bitwise OR of L_JP2K_* values; 0 for default
* \param[in] debug output callback messages, etc
* \return pix, or NULL on error
*
*
* Notes:
* (1) This crashes when reading through the fmemopen cookie.
* Until we can fix this, we use the file-based work-around.
* And fixing this may take some time, because the basic
* stream interface is no longer supported in openjpeg.
* (2) See pixReadJp2k() for usage.
*
*/
PIX *
pixReadMemJp2k(const l_uint8 *data,
size_t size,
l_uint32 reduction,
BOX *box,
l_int32 hint,
l_int32 debug)
{
FILE *fp;
PIX *pix;
PROCNAME("pixReadMemJp2k");
if (!data)
return (PIX *)ERROR_PTR("data not defined", procName, NULL);
if ((fp = fopenReadFromMemory(data, size)) == NULL)
return (PIX *)ERROR_PTR("stream not opened", procName, NULL);
pix = pixReadStreamJp2k(fp, reduction, box, hint, debug);
fclose(fp);
if (!pix) L_ERROR("pix not read\n", procName);
return pix;
}
/*!
* \brief pixWriteMemJp2k()
*
* \param[out] pdata data of jpeg compressed image
* \param[out] psize size of returned data
* \param[in] pix 8 or 32 bpp
* \param[in] quality SNR > 0; 0 for default (34); 100 for lossless
* \param[in] nlevels 0 for default
* \param[in] hint a bitwise OR of L_JP2K_* values; 0 for default
* \param[in] debug output callback messages, etc
* \return 0 if OK, 1 on error
*
*
* Notes:
* (1) See pixWriteJp2k() for usage. This version writes to
* memory instead of to a file stream.
*
*/
l_ok
pixWriteMemJp2k(l_uint8 **pdata,
size_t *psize,
PIX *pix,
l_int32 quality,
l_int32 nlevels,
l_int32 hint,
l_int32 debug)
{
l_int32 ret;
FILE *fp;
PROCNAME("pixWriteMemJp2k");
if (pdata) *pdata = NULL;
if (psize) *psize = 0;
if (!pdata)
return ERROR_INT("&data not defined", procName, 1 );
if (!psize)
return ERROR_INT("&size not defined", procName, 1 );
if (!pix)
return ERROR_INT("&pix not defined", procName, 1 );
#if HAVE_FMEMOPEN
if ((fp = open_memstream((char **)pdata, psize)) == NULL)
return ERROR_INT("stream not opened", procName, 1);
ret = pixWriteStreamJp2k(fp, pix, quality, nlevels, hint, debug);
#else
L_INFO("work-around: writing to a temp file\n", procName);
#ifdef _WIN32
if ((fp = fopenWriteWinTempfile()) == NULL)
return ERROR_INT("tmpfile stream not opened", procName, 1);
#else
if ((fp = tmpfile()) == NULL)
return ERROR_INT("tmpfile stream not opened", procName, 1);
#endif /* _WIN32 */
ret = pixWriteStreamJp2k(fp, pix, quality, nlevels, hint, debug);
rewind(fp);
*pdata = l_binaryReadStream(fp, psize);
#endif /* HAVE_FMEMOPEN */
fclose(fp);
return ret;
}
/*---------------------------------------------------------------------*
* Static functions from opj 2.0 to retain file stream interface *
*---------------------------------------------------------------------*/
static l_uint64
opj_get_user_data_length(FILE *fp) {
OPJ_OFF_T length = 0;
fseek(fp, 0, SEEK_END);
length = (OPJ_OFF_T)ftell(fp);
fseek(fp, 0, SEEK_SET);
return (l_uint64)length;
}
static OPJ_SIZE_T
opj_read_from_file(void *p_buffer, OPJ_SIZE_T p_nb_bytes, FILE *fp) {
OPJ_SIZE_T l_nb_read = fread(p_buffer, 1, p_nb_bytes, fp);
return l_nb_read ? l_nb_read : (OPJ_SIZE_T) - 1;
}
static OPJ_SIZE_T
opj_write_from_file(void *p_buffer, OPJ_SIZE_T p_nb_bytes, FILE *fp)
{
return fwrite(p_buffer, 1, p_nb_bytes, fp);
}
static OPJ_OFF_T
opj_skip_from_file(OPJ_OFF_T offset, FILE *fp) {
if (fseek(fp, offset, SEEK_CUR)) {
return -1;
}
return offset;
}
static l_int32
opj_seek_from_file(OPJ_OFF_T offset, FILE *fp) {
if (fseek(fp, offset, SEEK_SET)) {
return 0;
}
return 1;
}
/* Static generator of opj_stream from file stream */
static opj_stream_t *
opjCreateStream(FILE *fp,
l_int32 is_read_stream)
{
opj_stream_t *l_stream;
PROCNAME("opjCreateStream");
if (!fp)
return (opj_stream_t *)ERROR_PTR("fp not defined", procName, NULL);
l_stream = opj_stream_create(OPJ_J2K_STREAM_CHUNK_SIZE, is_read_stream);
if (!l_stream)
return (opj_stream_t *)ERROR_PTR("stream not made", procName, NULL);
#if OPJ_VERSION_MINOR == 0
opj_stream_set_user_data(l_stream, fp);
#else
opj_stream_set_user_data(l_stream, fp,
(opj_stream_free_user_data_fn)NULL);
#endif
opj_stream_set_user_data_length(l_stream, opj_get_user_data_length(fp));
opj_stream_set_read_function(l_stream,
(opj_stream_read_fn)opj_read_from_file);
opj_stream_set_write_function(l_stream,
(opj_stream_write_fn)opj_write_from_file);
opj_stream_set_skip_function(l_stream,
(opj_stream_skip_fn)opj_skip_from_file);
opj_stream_set_seek_function(l_stream,
(opj_stream_seek_fn)opj_seek_from_file);
return l_stream;
}
/* --------------------------------------------*/
#endif /* HAVE_LIBJP2K */
/* --------------------------------------------*/