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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 = (unsigned int) (0.1625 * cp->img_size + 2000); /* 0.1625 = 1.3/8 and 2000 bytes as a minimum for headers */
cio->buffer = (unsigned char *)opj_malloc(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.
*/
int 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.
*/
int cio_numbytesleft(opj_cio_t *cio) {
return cio->end - cio->bp;
}
/*
* 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;
}
return 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;
v = 0;
for (i = n - 1; i >= 0; i--) {
v += cio_bytein(cio) << (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;
}
/* ----------------------------------------------------------------------- */
/**
* Write some bytes to the given data buffer, this function is used in Big Endian cpus.
* @param p_buffer pointer the data buffer to write data to.
* @param p_value the value to write
* @param p_nb_bytes the number of bytes to write
*/
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);
}
/**
* Write some bytes to the given data buffer, this function is used in Little Endian cpus.
* @param p_buffer pointer the data buffer to write data to.
* @param p_value the value to write
* @param p_nb_bytes the number of bytes to write
* @return the number of bytes written or -1 if an error occured
*/
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--);
}
}
/**
* Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
* @param p_buffer pointer the data buffer to read data from.
* @param p_value pointer to the value that will store the data.
* @param p_nb_bytes the nb bytes to read.
* @return the number of bytes read or -1 if an error occured.
*/
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);
}
/**
* Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
* @param p_buffer pointer the data buffer to read data from.
* @param p_value pointer to the value that will store the data.
* @param p_nb_bytes the nb bytes to read.
* @return the number of bytes read or -1 if an error occured.
*/
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++);
}
}
/**
* Write some bytes to the given data buffer, this function is used in Big Endian cpus.
* @param p_buffer pointer the data buffer to write data to.
* @param p_value the value to write
* @return the number of bytes written or -1 if an error occured
*/
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));
}
/**
* Write some bytes to the given data buffer, this function is used in Little Endian cpus.
* @param p_buffer pointer the data buffer to write data to.
* @param p_value the value to write
*/
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--);
}
}
/**
* Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
* @param p_buffer pointer the data buffer to read data from.
* @param p_value pointer to the value that will store the data.
*/
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));
}
/**
* Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
* @param p_buffer pointer the data buffer to read data from.
* @param p_value pointer to the value that will store the data.
*/
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++);
}
}
/**
* Write some bytes to the given data buffer, this function is used in Big Endian cpus.
* @param p_buffer pointer the data buffer to write data to.
* @param p_value the value to write
* @return the number of bytes written or -1 if an error occured
*/
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));
}
/**
* Write some bytes to the given data buffer, this function is used in Little Endian cpus.
* @param p_buffer pointer the data buffer to write data to.
* @param p_value the value to write
*/
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--);
}
}
/**
* Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
* @param p_buffer pointer the data buffer to read data from.
* @param p_value pointer to the value that will store the data.
*/
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));
}
/**
* Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
* @param p_buffer pointer the data buffer to read data from.
* @param p_value pointer to the value that will store the data.
*/
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++);
}
}
/**
* Creates an abstract stream. This function does nothing except allocating memory and initializing the abstract stream.
* @return a stream object.
*/
opj_stream_t* OPJ_CALLCONV opj_stream_create(OPJ_UINT32 p_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_size;
l_stream->m_stored_data = (OPJ_BYTE *) opj_malloc(p_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;
}
/**
* Creates an abstract stream. This function does nothing except allocating memory and initializing the abstract stream.
* @return a stream object.
*/
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);
}
/**
* Destroys a stream created by opj_create_stream. This function does NOT close the abstract stream. If needed the user must
* close its own implementation of the stream.
*/
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);
}
}
/**
* Sets the given function to be used as a read function.
* @param p_stream the stream to modify
* @param p_function the function to use a read function.
*/
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;
}
/**
* Sets the given function to be used as a write function.
* @param p_stream the stream to modify
* @param p_function the function to use a write 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;
}
/**
* Sets the given function to be used as a skip function.
* @param p_stream the stream to modify
* @param p_function the function to use a skip 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;
}
/**
* Sets the given data to be used as a user data for the stream.
* @param p_stream the stream to modify
* @param p_data the data to set.
*/
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;
}
/**
* Reads some bytes from the stream.
* @param p_stream the stream to read data from.
* @param p_buffer pointer to the data buffer that will receive the data.
* @param p_size number of bytes to read.
* @param p_event_mgr the user event manager to be notified of special events.
* @return the number of bytes read, or -1 if an error occured or if the stream is at the end.
*/
OPJ_UINT32 opj_stream_read_data (opj_stream_private_t * p_stream,OPJ_BYTE * p_buffer, OPJ_UINT32 p_size, opj_event_mgr_t * p_event_mgr)
{
OPJ_UINT32 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 += 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 += p_stream->m_bytes_in_buffer;
p_stream->m_bytes_in_buffer = 0;
return l_read_nb_bytes ? l_read_nb_bytes : -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 += 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 == -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 : -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 += 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 += 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 == -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 : -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 += 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 += 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;
}
}
}
}
/**
* Writes some bytes from the stream.
* @param p_stream the stream to write data to.
* @param p_buffer pointer to the data buffer holds the data to be writtent.
* @param p_size number of bytes to write.
* @param p_event_mgr the user event manager to be notified of special events.
* @return the number of bytes writtent, or -1 if an error occured.
*/
OPJ_UINT32 opj_stream_write_data (opj_stream_private_t * p_stream,const OPJ_BYTE * p_buffer,OPJ_UINT32 p_size, opj_event_mgr_t * p_event_mgr)
{
OPJ_UINT32 l_remaining_bytes = 0;
OPJ_UINT32 l_write_nb_bytes = 0;
if
(p_stream->m_status & opj_stream_e_error)
{
return -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 += 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 += l_remaining_bytes;
}
if
(! opj_stream_flush(p_stream, p_event_mgr))
{
return -1;
}
}
}
/**
* Writes the content of the stream buffer to the stream.
* @param p_stream the stream to write data to.
* @param p_event_mgr the user event manager to be notified of special events.
* @return the number of bytes written, or -1 if an error occured.
*/
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_UINT32 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 == -1)
{
p_stream->m_status |= opj_stream_e_error;
opj_event_msg_v2(p_event_mgr, EVT_INFO, "Error on writting stream!\n");
return EXIT_FAILURE;
}
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 EXIT_SUCCESS;
}
/**
* Skips a number of bytes from the stream.
* @param p_stream the stream to skip data from.
* @param p_size the number of bytes to skip.
* @param p_event_mgr the user event manager to be notified of special events.
* @return the number of bytes skipped, or -1 if an error occured.
*/
OPJ_SIZE_T opj_stream_read_skip (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, opj_event_mgr_t * p_event_mgr)
{
OPJ_SIZE_T l_skip_nb_bytes = 0;
OPJ_SIZE_T l_current_skip_nb_bytes = 0;
if
(p_stream->m_bytes_in_buffer >= p_size)
{
p_stream->m_current_data += p_size;
p_stream->m_bytes_in_buffer -= 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 += 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_SIZE_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 += p_stream->m_bytes_in_buffer;
p_stream->m_current_data = p_stream->m_stored_data;
p_size -= 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_SIZE_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_SIZE_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;
}
/**
* Skips a number of bytes from the stream.
* @param p_stream the stream to skip data from.
* @param p_size the number of bytes to skip.
* @param p_event_mgr the user event manager to be notified of special events.
* @return the number of bytes skipped, or -1 if an error occured.
*/
OPJ_SIZE_T opj_stream_write_skip (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, opj_event_mgr_t * p_event_mgr)
{
opj_bool l_is_written = 0;
OPJ_SIZE_T l_current_skip_nb_bytes = 0;
OPJ_SIZE_T l_skip_nb_bytes = 0;
if
(p_stream->m_status & opj_stream_e_error)
{
return (OPJ_SIZE_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_SIZE_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_SIZE_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_SIZE_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;
}
/**
* Tells the byte offset on the stream (similar to ftell).
*
* @param p_stream the stream to get the information from.
*
* @return the current position of the stream.
*/
OPJ_SIZE_T opj_stream_tell (const opj_stream_private_t * p_stream)
{
return p_stream->m_byte_offset;
}
/**
* Skips a number of bytes from the stream.
* @param p_stream the stream to skip data from.
* @param p_size the number of bytes to skip.
* @param p_event_mgr the user event manager to be notified of special events.
* @return the number of bytes skipped, or -1 if an error occured.
*/
OPJ_SIZE_T opj_stream_skip (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, opj_event_mgr_t * p_event_mgr)
{
return p_stream->m_opj_skip(p_stream,p_size,p_event_mgr);
}
/**
* Skips a number of bytes from the stream.
* @param p_stream the stream to skip data from.
* @param p_size the number of bytes to skip.
* @param p_event_mgr the user event manager to be notified of special events.
* @return the number of bytes skipped, or -1 if an error occured.
*/
opj_bool opj_stream_read_seek (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, opj_event_mgr_t * 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 EXIT_FAILURE;
}
else
{
// reset stream status
p_stream->m_status &= (~opj_stream_e_end);
p_stream->m_byte_offset = p_size;
}
return EXIT_SUCCESS;
}
/**
* Skips a number of bytes from the stream.
* @param p_stream the stream to skip data from.
* @param p_size the number of bytes to skip.
* @param p_event_mgr the user event manager to be notified of special events.
* @return the number of bytes skipped, or -1 if an error occured.
*/
opj_bool opj_stream_write_seek (opj_stream_private_t * p_stream, OPJ_SIZE_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 EXIT_FAILURE;
}
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 EXIT_FAILURE;
}
else
{
p_stream->m_byte_offset = p_size;
}
return EXIT_SUCCESS;
}
/**
* Seeks a number of bytes from the stream.
* @param p_stream the stream to skip data from.
* @param p_size the number of bytes to skip.
* @param p_event_mgr the user event manager to be notified of special events.
* @return true if the stream is seekable.
*/
opj_bool opj_stream_seek (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr)
{
return p_stream->m_opj_seek(p_stream,p_size,p_event_mgr);
}
/**
* Tells if the given stream is seekable.
*/
opj_bool opj_stream_has_seek (const opj_stream_private_t * p_stream)
{
return p_stream->m_seek_fn != opj_stream_default_seek;
}
OPJ_UINT32 opj_stream_default_read (void * p_buffer, OPJ_UINT32 p_nb_bytes, void * p_user_data)
{
return (OPJ_UINT32) -1;
}
OPJ_UINT32 opj_stream_default_write (void * p_buffer, OPJ_UINT32 p_nb_bytes, void * p_user_data)
{
return (OPJ_UINT32) -1;
}
OPJ_SIZE_T opj_stream_default_skip (OPJ_SIZE_T p_nb_bytes, void * p_user_data)
{
return (OPJ_SIZE_T) -1;
}
opj_bool opj_stream_default_seek (OPJ_SIZE_T p_nb_bytes, void * p_user_data)
{
return EXIT_FAILURE;
}
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