/*
- * Copyright (c) 2001-2002, David Janssens
+ * 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
* POSSIBILITY OF SUCH DAMAGE.
*/
-#include "cio.h"
-#include <setjmp.h>
+#include "opj_includes.h"
-static unsigned char *cio_start, *cio_end, *cio_bp;
+/* ----------------------------------------------------------------------- */
-extern jmp_buf j2k_error;
+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;
+}
-/* <summary> */
-/* Number of bytes written. */
-/* </summary> */
-int cio_numbytes()
+/*
+ * 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;
+}
+
+
+/* ----------------------------------------------------------------------- */
+
+
+/**
+ * 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)
{
- return cio_bp - cio_start;
+ 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);
}
-/* <summary> */
-/* Get position in byte stream. */
-/* </summary> */
-int cio_tell()
+/**
+ * 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)
{
- return cio_bp - cio_start;
+ 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--);
+ }
}
-/* <summary> */
-/* Set position in byte stream. */
-/* </summary> */
-void cio_seek(int pos)
+/**
+ * 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)
{
- cio_bp = cio_start + pos;
+ 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);
}
-/* <summary> */
-/* Number of bytes left before the end of the stream. */
-/* </summary> */
-int cio_numbytesleft()
+/**
+ * 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)
{
- return cio_end - cio_bp;
+ 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++);
+ }
}
-/* <summary> */
-/* Get pointer to the current position in the stream. */
-/* </summary> */
-unsigned char *cio_getbp()
+/**
+ * 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)
{
- return cio_bp;
+ const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
+ memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT64));
}
-/* <summary> */
-/* Initialize byte IO. */
-/* </summary> */
-void cio_init(unsigned char *bp, int len)
+/**
+ * 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)
{
- cio_start = bp;
- cio_end = bp + len;
- cio_bp = bp;
+ 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--);
+ }
}
-/* <summary> */
-/* Write a byte. */
-/* </summary> */
-void cio_byteout(unsigned char v)
+/**
+ * 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)
{
- if (cio_bp >= cio_end)
- longjmp(j2k_error, 1);
- *cio_bp++ = v;
+ 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++);
+ }
}
-/* <summary> */
-/* Read a byte. */
-/* </summary> */
-unsigned char cio_bytein()
+/**
+ * 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)
{
- if (cio_bp >= cio_end)
- longjmp(j2k_error, 1);
- return *cio_bp++;
+ const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
+ memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT32));
}
-/* <summary> */
-/* Write a byte. */
-/* </summary> */
-void cio_write(unsigned int v, int n)
+/**
+ * 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)
{
- int i;
- for (i = n - 1; i >= 0; i--) {
- cio_byteout((unsigned char) ((v >> (i << 3)) & 0xff));
+ 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--);
}
}
-/* <summary> */
-/* Read some bytes. */
-/* </summary> */
-unsigned int cio_read(int n)
+/**
+ * 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)
{
- int i;
- unsigned int v;
- v = 0;
- for (i = n - 1; i >= 0; i--) {
- v += cio_bytein() << (i << 3);
+ 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++);
}
- return v;
}
-/* <summary> */
-/* Write some bytes. */
-/* </summary> */
-void cio_skip(int n)
+
+/**
+ * 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_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;
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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_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;
+}
+
+/**
+ * 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_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;
+ }
+ }
+ }
+}
+
+/**
+ * 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_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;
+ }
+ }
+
+}
+
+/**
+ * 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_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;
+}
+
+/**
+ * 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_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;
+}
+
+/**
+ * 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_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;
+}
+
+/**
+ * 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_OFF_T opj_stream_tell (const opj_stream_private_t * p_stream)
+{
+ return p_stream->m_byte_offset;
+}
+
+
+/**
+ * Get the number of bytes left before the end of the stream (similar to cio_numbytesleft).
+ *
+ * @param p_stream the stream to get the information from.
+ *
+ * @return Number of bytes left before the end of the stream.
+ */
+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;
+}
+
+/**
+ * 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_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);
+}
+
+
+/**
+ * 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_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;
+}
+
+/**
+ * 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_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;
+}
+
+
+/**
+ * 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_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);
+}
+
+/**
+ * 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_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)
{
- cio_bp += n;
+ OPJ_ARG_NOT_USED(p_nb_bytes);
+ OPJ_ARG_NOT_USED(p_user_data);
+ return OPJ_FALSE;
}
projects / openjpeg.git / blobdiff