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Implementation of a IsoStream to read from a memory buffer.

release-1.5.4.branch
Vreixo Formoso 14 years ago
parent
commit
807c43b20e
  1. 1
      src/fsource.h
  2. 156
      src/stream.c
  3. 9
      src/stream.h

1
src/fsource.h

@ -22,6 +22,7 @@
#define ISO_LOCAL_FS_ID 1
#define ISO_IMAGE_FS_ID 2
#define ISO_ELTORITO_FS_ID 3
#define ISO_MEM_FS_ID 4
typedef struct Iso_File_Source IsoFileSource;
typedef struct Iso_Filesystem IsoFilesystem;

156
src/stream.c

@ -10,11 +10,13 @@
#include "stream.h"
#include "fsource.h"
#include "error.h"
#include "util.h"
#include <stdlib.h>
#include <string.h>
ino_t serial_id = (ino_t)1;
ino_t mem_serial_id = (ino_t)1;
typedef struct
{
@ -201,6 +203,160 @@ int iso_file_source_stream_new(IsoFileSource *src, IsoStream **stream)
return ISO_SUCCESS;
}
typedef struct
{
uint8_t *buf;
ssize_t offset; /* -1 if stream closed */
ino_t ino_id;
size_t size;
} MemStreamData;
static
int mem_open(IsoStream *stream)
{
MemStreamData *data;
if (stream == NULL) {
return ISO_NULL_POINTER;
}
data = (MemStreamData*)stream->data;
if (data->offset != -1) {
return ISO_FILE_ALREADY_OPENNED;
}
data->offset = 0;
return ISO_SUCCESS;
}
static
int mem_close(IsoStream *stream)
{
MemStreamData *data;
if (stream == NULL) {
return ISO_NULL_POINTER;
}
data = (MemStreamData*)stream->data;
if (data->offset == -1) {
return ISO_FILE_NOT_OPENNED;
}
data->offset = -1;
return ISO_SUCCESS;
}
static
off_t mem_get_size(IsoStream *stream)
{
MemStreamData *data;
data = (MemStreamData*)stream->data;
return (off_t)data->size;
}
static
int mem_read(IsoStream *stream, void *buf, size_t count)
{
size_t len;
MemStreamData *data;
if (stream == NULL || buf == NULL) {
return ISO_NULL_POINTER;
}
if (count == 0) {
return ISO_WRONG_ARG_VALUE;
}
data = stream->data;
if (data->offset == -1) {
return ISO_FILE_NOT_OPENNED;
}
len = MIN(count, data->size - data->offset);
memcpy(buf, data->buf + data->offset, len);
return len;
}
static
int mem_is_repeatable(IsoStream *stream)
{
return 1;
}
static
void mem_get_id(IsoStream *stream, unsigned int *fs_id, dev_t *dev_id,
ino_t *ino_id)
{
MemStreamData *data;
data = (MemStreamData*)stream->data;
*fs_id = ISO_MEM_FS_ID;
*dev_id = 0;
*ino_id = data->ino_id;
}
static
char *mem_get_name(IsoStream *stream)
{
return strdup("[MEMORY SOURCE]");
}
static
void mem_free(IsoStream *stream)
{
MemStreamData *data;
data = (MemStreamData*)stream->data;
free(data->buf);
free(data);
}
IsoStreamIface mem_stream_class = {
mem_open,
mem_close,
mem_get_size,
mem_read,
mem_is_repeatable,
mem_get_id,
mem_get_name,
mem_free
};
/**
* Create a stream for reading from a arbitrary memory buffer.
* When the Stream refcount reach 0, the buffer is free(3).
*
* @return
* 1 sucess, < 0 error
*/
int iso_memory_stream_new(unsigned char *buf, size_t size, IsoStream **stream)
{
IsoStream *str;
MemStreamData *data;
if (buf == NULL || stream == NULL) {
return ISO_NULL_POINTER;
}
str = malloc(sizeof(IsoStream));
if (str == NULL) {
return ISO_MEM_ERROR;
}
data = malloc(sizeof(MemStreamData));
if (str == NULL) {
free(str);
return ISO_MEM_ERROR;
}
/* fill data */
data->buf = buf;
data->size = size;
data->offset = -1;
data->ino_id = mem_serial_id++;
str->refcount = 1;
str->data = data;
str->class = &mem_stream_class;
*stream = str;
return ISO_SUCCESS;
}
void iso_stream_ref(IsoStream *stream)
{
++stream->refcount;

9
src/stream.h

@ -162,4 +162,13 @@ char *iso_stream_get_name(IsoStream *stream)
*/
int iso_file_source_stream_new(IsoFileSource *src, IsoStream **stream);
/**
* Create a stream for reading from a arbitrary memory buffer.
* When the Stream refcount reach 0, the buffer is free(3).
*
* @return
* 1 sucess, < 0 error
*/
int iso_memory_stream_new(unsigned char *buf, size_t size, IsoStream **stream);
#endif /*STREAM_H_*/

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