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Add libstream-like interface

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This commit is contained in:
Laurent Vivier 2005-11-21 22:09:16 +00:00
parent 8a104ca7ca
commit bce8a698c5
2 changed files with 24 additions and 15 deletions
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31
tools/device.c
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@ -8,28 +8,35 @@
#include <unistd.h> #include <unistd.h>
#include <stdio.h> #include <stdio.h>
#include "device.h"
#define SECTOR_SIZE (2048) #define SECTOR_SIZE (2048)
#define ISO_BLOCKS(X) (((X) / SECTOR_SIZE) + (((X)%SECTOR_SIZE)?1:0)) #define ISO_BLOCKS(X) (((X) / SECTOR_SIZE) + (((X)%SECTOR_SIZE)?1:0))
static const char *filename = "/dev/cdrom"; static const char *filename = "/dev/cdrom";
static FILE *infile = NULL;
int device_open(void) int device_read_sector(void *data,off_t offset, void* buffer, size_t size)
{ {
infile = fopen(filename, "rb"); FILE* file = (FILE*)data;
if (infile == NULL)
return -1; lseek(fileno(file), offset << 11, SEEK_SET);
return 0; return read(fileno(file), buffer, ISO_BLOCKS(size) << 11);
} }
void device_close(void) void device_close(void *data)
{ {
if (infile) FILE* file = (FILE*)data;
fclose(infile); if (file)
fclose(file);
} }
void device_read(off_t offset, void* buffer, size_t size) FILE *device_open(void)
{ {
lseek(fileno(infile), offset << 11, SEEK_SET); FILE* file;
read(fileno(infile), buffer, ISO_BLOCKS(size) << 11);
file = fopen(filename, "rb");
if (file == NULL)
return NULL;
return file;
} }

8
tools/device.h
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@ -8,6 +8,8 @@
#include <unistd.h> #include <unistd.h>
#include <stdio.h> #include <stdio.h>
extern int device_open(void); #include <libstream.h>
extern void device_close(void);
extern void device_read(off_t offset, void* buffer, size_t size); extern FILE *device_open(void);
extern void device_close(void *data);
extern int device_read_sector(void *data, off_t offset, void* buffer, size_t size);