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openjpeg/libopenjpeg/cio.c

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/*
* Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
* Copyright (c) 2002-2007, Professor Benoit Macq
* Copyright (c) 2001-2003, David Janssens
* Copyright (c) 2002-2003, Yannick Verschueren
* Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
* Copyright (c) 2005, Herve Drolon, FreeImage Team
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "opj_includes.h"
/* ----------------------------------------------------------------------- */
opj_cio_t* OPJ_CALLCONV opj_cio_open(opj_common_ptr cinfo, unsigned char *buffer, int length) {
opj_cp_t *cp = NULL;
opj_cio_t *cio = (opj_cio_t*)opj_malloc(sizeof(opj_cio_t));
if(!cio) return NULL;
cio->cinfo = cinfo;
if(buffer && length) {
/* wrap a user buffer containing the encoded image */
cio->openmode = OPJ_STREAM_READ;
cio->buffer = buffer;
cio->length = length;
}
else if(!buffer && !length && cinfo) {
/* allocate a buffer for the encoded image */
cio->openmode = OPJ_STREAM_WRITE;
switch(cinfo->codec_format) {
case CODEC_J2K:
cp = ((opj_j2k_t*)cinfo->j2k_handle)->cp;
break;
case CODEC_JP2:
cp = ((opj_jp2_t*)cinfo->jp2_handle)->j2k->cp;
break;
default:
opj_free(cio);
return NULL;
}
cio->length = (int) (0.1625 * cp->img_size + 2000); /* 0.1625 = 1.3/8 and 2000 bytes as a minimum for headers */
assert(cio->length >= 0);
cio->buffer = (unsigned char *)opj_malloc((OPJ_SIZE_T)cio->length);
if(!cio->buffer) {
opj_event_msg(cio->cinfo, EVT_ERROR, "Error allocating memory for compressed bitstream\n");
opj_free(cio);
return NULL;
}
}
else {
opj_free(cio);
return NULL;
}
/* Initialize byte IO */
cio->start = cio->buffer;
cio->end = cio->buffer + cio->length;
cio->bp = cio->buffer;
return cio;
}
void OPJ_CALLCONV opj_cio_close(opj_cio_t *cio) {
if(cio) {
if(cio->openmode == OPJ_STREAM_WRITE) {
/* destroy the allocated buffer */
opj_free(cio->buffer);
}
/* destroy the cio */
opj_free(cio);
}
}
/* ----------------------------------------------------------------------- */
/*
* Get position in byte stream.
*/
OPJ_OFF_T OPJ_CALLCONV cio_tell(opj_cio_t *cio) {
return cio->bp - cio->start;
}
/*
* Set position in byte stream.
*
* pos : position, in number of bytes, from the beginning of the stream
*/
void OPJ_CALLCONV cio_seek(opj_cio_t *cio, int pos) {
cio->bp = cio->start + pos;
}
/*
* Number of bytes left before the end of the stream.
*/
OPJ_SIZE_T cio_numbytesleft(opj_cio_t *cio) {
const ptrdiff_t diff = cio->end - cio->bp;
assert( diff >= 0 );
return (OPJ_SIZE_T)diff;
}
/*
* Get pointer to the current position in the stream.
*/
unsigned char *cio_getbp(opj_cio_t *cio) {
return cio->bp;
}
/*
* Write a byte.
*/
opj_bool cio_byteout(opj_cio_t *cio, unsigned char v) {
if (cio->bp >= cio->end) {
opj_event_msg(cio->cinfo, EVT_ERROR, "write error\n");
return OPJ_FALSE;
}
*cio->bp++ = v;
return OPJ_TRUE;
}
/*
* Read a byte.
*/
unsigned char cio_bytein(opj_cio_t *cio) {
if (cio->bp >= cio->end) {
opj_event_msg(cio->cinfo, EVT_ERROR, "read error: passed the end of the codestream (start = %d, current = %d, end = %d\n", cio->start, cio->bp, cio->end);
return 0;
}
return *cio->bp++;
}
/*
* Write some bytes.
*
* v : value to write
* n : number of bytes to write
*/
unsigned int cio_write(opj_cio_t *cio, unsigned long long int v, int n) {
int i;
for (i = n - 1; i >= 0; i--) {
if( !cio_byteout(cio, (unsigned char) ((v >> (i << 3)) & 0xff)) )
return 0;
}
assert( n >= 0 );
return (unsigned int)n;
}
/*
* Read some bytes.
*
* n : number of bytes to read
*
* return : value of the n bytes read
*/
unsigned int cio_read(opj_cio_t *cio, int n) {
int i;
unsigned int v = 0;
for (i = n - 1; i >= 0; i--) {
const unsigned int c = cio_bytein(cio);
v += c << (i << 3);
}
return v;
}
/*
* Skip some bytes.
*
* n : number of bytes to skip
*/
void cio_skip(opj_cio_t *cio, int n) {
cio->bp += n;
}
/* ----------------------------------------------------------------------- */
void opj_write_bytes_BE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes)
{
const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + p_nb_bytes;
assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
memcpy(p_buffer,l_data_ptr,p_nb_bytes);
}
void opj_write_bytes_LE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes)
{
const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + p_nb_bytes - 1;
OPJ_UINT32 i;
assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
for (i=0;i<p_nb_bytes;++i) {
*(p_buffer++) = *(l_data_ptr--);
}
}
void opj_read_bytes_BE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes)
{
OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
*p_value = 0;
memcpy(l_data_ptr+4-p_nb_bytes,p_buffer,p_nb_bytes);
}
void opj_read_bytes_LE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes)
{
OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + p_nb_bytes-1;
OPJ_UINT32 i;
assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
*p_value = 0;
for (i=0;i<p_nb_bytes;++i) {
*(l_data_ptr--) = *(p_buffer++);
}
}
void opj_write_double_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value)
{
const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT64));
}
void opj_write_double_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value)
{
const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + sizeof(OPJ_FLOAT64) - 1;
OPJ_UINT32 i;
for (i=0;i<sizeof(OPJ_FLOAT64);++i) {
*(p_buffer++) = *(l_data_ptr--);
}
}
void opj_read_double_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value)
{
OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
memcpy(l_data_ptr,p_buffer,sizeof(OPJ_FLOAT64));
}
void opj_read_double_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value)
{
OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + sizeof(OPJ_FLOAT64)-1;
OPJ_UINT32 i;
for (i=0;i<sizeof(OPJ_FLOAT64);++i) {
*(l_data_ptr--) = *(p_buffer++);
}
}
void opj_write_float_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value)
{
const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT32));
}
void opj_write_float_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value)
{
const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + sizeof(OPJ_FLOAT32) - 1;
OPJ_UINT32 i;
for (i=0;i<sizeof(OPJ_FLOAT32);++i) {
*(p_buffer++) = *(l_data_ptr--);
}
}
void opj_read_float_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value)
{
OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
memcpy(l_data_ptr,p_buffer,sizeof(OPJ_FLOAT32));
}
void opj_read_float_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value)
{
OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + sizeof(OPJ_FLOAT32)-1;
OPJ_UINT32 i;
for (i=0;i<sizeof(OPJ_FLOAT32);++i) {
*(l_data_ptr--) = *(p_buffer++);
}
}
opj_stream_t* OPJ_CALLCONV opj_stream_create(OPJ_SIZE_T p_buffer_size,opj_bool l_is_input)
{
opj_stream_private_t * l_stream = 00;
l_stream = (opj_stream_private_t*) opj_malloc(sizeof(opj_stream_private_t));
if (! l_stream) {
return 00;
}
memset(l_stream,0,sizeof(opj_stream_private_t));
l_stream->m_buffer_size = p_buffer_size;
l_stream->m_stored_data = (OPJ_BYTE *) opj_malloc(p_buffer_size);
if (! l_stream->m_stored_data) {
opj_free(l_stream);
return 00;
}
l_stream->m_current_data = l_stream->m_stored_data;
if (l_is_input) {
l_stream->m_status |= opj_stream_e_input;
l_stream->m_opj_skip = opj_stream_read_skip;
l_stream->m_opj_seek = opj_stream_read_seek;
}
else {
l_stream->m_status |= opj_stream_e_output;
l_stream->m_opj_skip = opj_stream_write_skip;
l_stream->m_opj_seek = opj_stream_write_seek;
}
l_stream->m_read_fn = opj_stream_default_read;
l_stream->m_write_fn = opj_stream_default_write;
l_stream->m_skip_fn = opj_stream_default_skip;
l_stream->m_seek_fn = opj_stream_default_seek;
return (opj_stream_t *) l_stream;
}
opj_stream_t* OPJ_CALLCONV opj_stream_default_create(opj_bool l_is_input)
{
return opj_stream_create(J2K_STREAM_CHUNK_SIZE,l_is_input);
}
OPJ_API void OPJ_CALLCONV opj_stream_destroy(opj_stream_t* p_stream)
{
opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
if (l_stream) {
opj_free(l_stream->m_stored_data);
l_stream->m_stored_data = 00;
opj_free(l_stream);
}
}
OPJ_API void OPJ_CALLCONV opj_stream_set_read_function(opj_stream_t* p_stream, opj_stream_read_fn p_function)
{
opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
if ((!l_stream) || (! (l_stream->m_status & opj_stream_e_input))) {
return;
}
l_stream->m_read_fn = p_function;
}
OPJ_API void OPJ_CALLCONV opj_stream_set_seek_function(opj_stream_t* p_stream, opj_stream_seek_fn p_function)
{
opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
if (!l_stream) {
return;
}
l_stream->m_seek_fn = p_function;
}
OPJ_API void OPJ_CALLCONV opj_stream_set_write_function(opj_stream_t* p_stream, opj_stream_write_fn p_function)
{
opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
if ((!l_stream )|| (! (l_stream->m_status & opj_stream_e_output))) {
return;
}
l_stream->m_write_fn = p_function;
}
OPJ_API void OPJ_CALLCONV opj_stream_set_skip_function(opj_stream_t* p_stream, opj_stream_skip_fn p_function)
{
opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
if (! l_stream) {
return;
}
l_stream->m_skip_fn = p_function;
}
OPJ_API void OPJ_CALLCONV opj_stream_set_user_data(opj_stream_t* p_stream, void * p_data)
{
opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
l_stream->m_user_data = p_data;
}
OPJ_API void OPJ_CALLCONV opj_stream_set_user_data_length(opj_stream_t* p_stream, OPJ_UINT64 data_length)
{
opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
l_stream->m_user_data_length = data_length;
}
OPJ_SIZE_T opj_stream_read_data (opj_stream_private_t * p_stream,OPJ_BYTE * p_buffer, OPJ_SIZE_T p_size, opj_event_mgr_t * p_event_mgr)
{
OPJ_SIZE_T l_read_nb_bytes = 0;
if (p_stream->m_bytes_in_buffer >= p_size) {
memcpy(p_buffer,p_stream->m_current_data,p_size);
p_stream->m_current_data += p_size;
p_stream->m_bytes_in_buffer -= p_size;
l_read_nb_bytes += p_size;
p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
return l_read_nb_bytes;
}
/* we are now in the case when the remaining data if not sufficient */
if (p_stream->m_status & opj_stream_e_end) {
l_read_nb_bytes += p_stream->m_bytes_in_buffer;
memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
p_stream->m_current_data += p_stream->m_bytes_in_buffer;
p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
p_stream->m_bytes_in_buffer = 0;
return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
}
/* the flag is not set, we copy data and then do an actual read on the stream */
if (p_stream->m_bytes_in_buffer) {
l_read_nb_bytes += p_stream->m_bytes_in_buffer;
memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
p_stream->m_current_data = p_stream->m_stored_data;
p_buffer += p_stream->m_bytes_in_buffer;
p_size -= p_stream->m_bytes_in_buffer;
p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
p_stream->m_bytes_in_buffer = 0;
}
else {
/* case where we are already at the end of the buffer
so reset the m_current_data to point to the start of the
stored buffer to get ready to read from disk*/
p_stream->m_current_data = p_stream->m_stored_data;
}
while(1){
/* we should read less than a chunk -> read a chunk */
if (p_size < p_stream->m_buffer_size) {
/* we should do an actual read on the media */
p_stream->m_bytes_in_buffer = p_stream->m_read_fn(p_stream->m_stored_data,p_stream->m_buffer_size,p_stream->m_user_data);
if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
/* end of stream */
opj_event_msg_v2(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
p_stream->m_bytes_in_buffer = 0;
p_stream->m_status |= opj_stream_e_end;
/* end of stream */
return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
}
else if (p_stream->m_bytes_in_buffer < p_size) {
/* not enough data */
l_read_nb_bytes += p_stream->m_bytes_in_buffer;
memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
p_stream->m_current_data = p_stream->m_stored_data;
p_buffer += p_stream->m_bytes_in_buffer;
p_size -= p_stream->m_bytes_in_buffer;
p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
p_stream->m_bytes_in_buffer = 0;
}
else {
l_read_nb_bytes += p_size;
memcpy(p_buffer,p_stream->m_current_data,p_size);
p_stream->m_current_data += p_size;
p_stream->m_bytes_in_buffer -= p_size;
p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
return l_read_nb_bytes;
}
}
else {
/* direct read on the dest buffer */
p_stream->m_bytes_in_buffer = p_stream->m_read_fn(p_buffer,p_size,p_stream->m_user_data);
if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
/* end of stream */
opj_event_msg_v2(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
p_stream->m_bytes_in_buffer = 0;
p_stream->m_status |= opj_stream_e_end;
/* end of stream */
return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
}
else if (p_stream->m_bytes_in_buffer < p_size) {
/* not enough data */
l_read_nb_bytes += p_stream->m_bytes_in_buffer;
p_stream->m_current_data = p_stream->m_stored_data;
p_buffer += p_stream->m_bytes_in_buffer;
p_size -= p_stream->m_bytes_in_buffer;
p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
p_stream->m_bytes_in_buffer = 0;
}
else {
/* we have read the exact size */
l_read_nb_bytes += p_stream->m_bytes_in_buffer;
p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
p_stream->m_current_data = p_stream->m_stored_data;
p_stream->m_bytes_in_buffer = 0;
return l_read_nb_bytes;
}
}
}
}
OPJ_SIZE_T opj_stream_write_data (opj_stream_private_t * p_stream,
const OPJ_BYTE * p_buffer,
OPJ_SIZE_T p_size,
opj_event_mgr_t * p_event_mgr)
{
OPJ_SIZE_T l_remaining_bytes = 0;
OPJ_SIZE_T l_write_nb_bytes = 0;
if (p_stream->m_status & opj_stream_e_error) {
return (OPJ_SIZE_T)-1;
}
while(1) {
l_remaining_bytes = p_stream->m_buffer_size - p_stream->m_bytes_in_buffer;
/* we have more memory than required */
if (l_remaining_bytes >= p_size) {
memcpy(p_stream->m_current_data, p_buffer, p_size);
p_stream->m_current_data += p_size;
p_stream->m_bytes_in_buffer += p_size;
l_write_nb_bytes += p_size;
p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
return l_write_nb_bytes;
}
/* we copy data and then do an actual read on the stream */
if (l_remaining_bytes) {
l_write_nb_bytes += l_remaining_bytes;
memcpy(p_stream->m_current_data,p_buffer,l_remaining_bytes);
p_stream->m_current_data = p_stream->m_stored_data;
p_buffer += l_remaining_bytes;
p_size -= l_remaining_bytes;
p_stream->m_bytes_in_buffer += l_remaining_bytes;
p_stream->m_byte_offset += (OPJ_OFF_T)l_remaining_bytes;
}
if (! opj_stream_flush(p_stream, p_event_mgr)) {
return (OPJ_SIZE_T)-1;
}
}
}
opj_bool opj_stream_flush (opj_stream_private_t * p_stream, opj_event_mgr_t * p_event_mgr)
{
/* the number of bytes written on the media. */
OPJ_SIZE_T l_current_write_nb_bytes = 0;
p_stream->m_current_data = p_stream->m_stored_data;
while (p_stream->m_bytes_in_buffer) {
/* we should do an actual write on the media */
l_current_write_nb_bytes = p_stream->m_write_fn(p_stream->m_current_data,
p_stream->m_bytes_in_buffer,
p_stream->m_user_data);
if (l_current_write_nb_bytes == (OPJ_SIZE_T)-1) {
p_stream->m_status |= opj_stream_e_error;
opj_event_msg_v2(p_event_mgr, EVT_INFO, "Error on writting stream!\n");
return OPJ_FALSE;
}
p_stream->m_current_data += l_current_write_nb_bytes;
p_stream->m_bytes_in_buffer -= l_current_write_nb_bytes;
}
p_stream->m_current_data = p_stream->m_stored_data;
return OPJ_TRUE;
}
OPJ_OFF_T opj_stream_read_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
{
OPJ_OFF_T l_skip_nb_bytes = 0;
OPJ_OFF_T l_current_skip_nb_bytes = 0;
assert( p_size >= 0 );
if (p_stream->m_bytes_in_buffer >= (OPJ_SIZE_T)p_size) {
p_stream->m_current_data += p_size;
/* it is safe to cast p_size to OPJ_SIZE_T since it is <= m_bytes_in_buffer
which is of type OPJ_SIZE_T */
p_stream->m_bytes_in_buffer -= (OPJ_SIZE_T)p_size;
l_skip_nb_bytes += p_size;
p_stream->m_byte_offset += l_skip_nb_bytes;
return l_skip_nb_bytes;
}
/* we are now in the case when the remaining data if not sufficient */
if (p_stream->m_status & opj_stream_e_end) {
l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
p_stream->m_current_data += p_stream->m_bytes_in_buffer;
p_stream->m_bytes_in_buffer = 0;
p_stream->m_byte_offset += l_skip_nb_bytes;
return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
}
/* the flag is not set, we copy data and then do an actual skip on the stream */
if (p_stream->m_bytes_in_buffer) {
l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
p_stream->m_current_data = p_stream->m_stored_data;
p_size -= (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
p_stream->m_bytes_in_buffer = 0;
}
while (p_size > 0) {
/* we should do an actual skip on the media */
l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
if (l_current_skip_nb_bytes == (OPJ_OFF_T) -1) {
opj_event_msg_v2(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
p_stream->m_status |= opj_stream_e_end;
p_stream->m_byte_offset += l_skip_nb_bytes;
/* end if stream */
return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
}
p_size -= l_current_skip_nb_bytes;
l_skip_nb_bytes += l_current_skip_nb_bytes;
}
p_stream->m_byte_offset += l_skip_nb_bytes;
return l_skip_nb_bytes;
}
OPJ_OFF_T opj_stream_write_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
{
opj_bool l_is_written = 0;
OPJ_OFF_T l_current_skip_nb_bytes = 0;
OPJ_OFF_T l_skip_nb_bytes = 0;
if (p_stream->m_status & opj_stream_e_error) {
return (OPJ_OFF_T) -1;
}
/* we should flush data */
l_is_written = opj_stream_flush (p_stream, p_event_mgr);
if (! l_is_written) {
p_stream->m_status |= opj_stream_e_error;
p_stream->m_bytes_in_buffer = 0;
p_stream->m_current_data = p_stream->m_current_data;
return (OPJ_OFF_T) -1;
}
/* then skip */
while (p_size > 0) {
/* we should do an actual skip on the media */
l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
if (l_current_skip_nb_bytes == (OPJ_OFF_T)-1) {
opj_event_msg_v2(p_event_mgr, EVT_INFO, "Stream error!\n");
p_stream->m_status |= opj_stream_e_error;
p_stream->m_byte_offset += l_skip_nb_bytes;
/* end if stream */
return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T)-1;
}
p_size -= l_current_skip_nb_bytes;
l_skip_nb_bytes += l_current_skip_nb_bytes;
}
p_stream->m_byte_offset += l_skip_nb_bytes;
return l_skip_nb_bytes;
}
OPJ_OFF_T opj_stream_tell (const opj_stream_private_t * p_stream)
{
return p_stream->m_byte_offset;
}
OPJ_OFF_T opj_stream_get_number_byte_left (const opj_stream_private_t * p_stream)
{
assert( p_stream->m_byte_offset >= 0 );
assert( p_stream->m_user_data_length >= (OPJ_UINT64)p_stream->m_byte_offset);
return p_stream->m_user_data_length ?
(OPJ_OFF_T)(p_stream->m_user_data_length) - p_stream->m_byte_offset :
0;
}
OPJ_OFF_T opj_stream_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
{
assert(p_size >= 0);
return p_stream->m_opj_skip(p_stream,p_size,p_event_mgr);
}
opj_bool opj_stream_read_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
{
OPJ_ARG_NOT_USED(p_event_mgr);
p_stream->m_current_data = p_stream->m_stored_data;
p_stream->m_bytes_in_buffer = 0;
if( !(p_stream->m_seek_fn(p_size,p_stream->m_user_data)) ) {
p_stream->m_status |= opj_stream_e_end;
return OPJ_FALSE;
}
else {
/* reset stream status */
p_stream->m_status &= (~opj_stream_e_end);
p_stream->m_byte_offset = p_size;
}
return OPJ_TRUE;
}
opj_bool opj_stream_write_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
{
if (! opj_stream_flush(p_stream,p_event_mgr)) {
p_stream->m_status |= opj_stream_e_error;
return OPJ_FALSE;
}
p_stream->m_current_data = p_stream->m_stored_data;
p_stream->m_bytes_in_buffer = 0;
if (! p_stream->m_seek_fn(p_size,p_stream->m_user_data)) {
p_stream->m_status |= opj_stream_e_error;
return OPJ_FALSE;
}
else {
p_stream->m_byte_offset = p_size;
}
return OPJ_TRUE;
}
opj_bool opj_stream_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, struct opj_event_mgr * p_event_mgr)
{
assert(p_size >= 0);
return p_stream->m_opj_seek(p_stream,p_size,p_event_mgr);
}
opj_bool opj_stream_has_seek (const opj_stream_private_t * p_stream)
{
return p_stream->m_seek_fn != opj_stream_default_seek;
}
OPJ_SIZE_T opj_stream_default_read (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
{
OPJ_ARG_NOT_USED(p_buffer);
OPJ_ARG_NOT_USED(p_nb_bytes);
OPJ_ARG_NOT_USED(p_user_data);
return (OPJ_SIZE_T) -1;
}
OPJ_SIZE_T opj_stream_default_write (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
{
OPJ_ARG_NOT_USED(p_buffer);
OPJ_ARG_NOT_USED(p_nb_bytes);
OPJ_ARG_NOT_USED(p_user_data);
return (OPJ_SIZE_T) -1;
}
OPJ_OFF_T opj_stream_default_skip (OPJ_OFF_T p_nb_bytes, void * p_user_data)
{
OPJ_ARG_NOT_USED(p_nb_bytes);
OPJ_ARG_NOT_USED(p_user_data);
return (OPJ_OFF_T) -1;
}
opj_bool opj_stream_default_seek (OPJ_OFF_T p_nb_bytes, void * p_user_data)
{
OPJ_ARG_NOT_USED(p_nb_bytes);
OPJ_ARG_NOT_USED(p_user_data);
return OPJ_FALSE;
}
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