"Fossies" - the Fresh Open Source Software Archive  

Source code changes of the file "swap.c" between
mtools-4.0.35.tar.bz2 and mtools-4.0.36.tar.bz2

About: Mtools is a collection of utilities to access MS-DOS disks from Unix without mounting them.

swap.c  (mtools-4.0.35.tar.bz2):swap.c  (mtools-4.0.36.tar.bz2)
skipping to change at line 26 skipping to change at line 26
* *
* filter to support byte-swapped filesystems * filter to support byte-swapped filesystems
*/ */
#include "sysincludes.h" #include "sysincludes.h"
#include "msdos.h" #include "msdos.h"
#include "mtools.h" #include "mtools.h"
#include "swap.h" #include "swap.h"
typedef struct Swap_t { typedef struct Swap_t {
struct Class_t *Class; struct Stream_t head;
int refs;
struct Stream_t *Next;
struct Stream_t *Buffer;
} Swap_t; } Swap_t;
static void swap_buffer(char *buf, size_t len) static void swap_buffer(char *buf, size_t len)
{ {
unsigned int i; unsigned int i;
for (i=0; i<len; i+=2) { for (i=0; i<len; i+=2) {
char temp = buf[i]; char temp = buf[i];
buf[i] = buf[i+1]; buf[i] = buf[i+1];
buf[i+1] = temp; buf[i+1] = temp;
} }
} }
static ssize_t swap_read(Stream_t *Stream, char *buf, static ssize_t swap_pread(Stream_t *Stream, char *buf,
mt_off_t where, size_t len) mt_off_t where, size_t len)
{ {
DeclareThis(Swap_t); DeclareThis(Swap_t);
ssize_t result = READS(This->Next, buf, where, len); ssize_t result = PREADS(This->head.Next, buf, where, len);
if(result < 0) if(result < 0)
return result; return result;
swap_buffer( buf, (size_t) result); swap_buffer( buf, (size_t) result);
return result; return result;
} }
static ssize_t swap_write(Stream_t *Stream, char *buf, static ssize_t swap_pwrite(Stream_t *Stream, char *buf,
mt_off_t where, size_t len) mt_off_t where, size_t len)
{ {
DeclareThis(Swap_t); DeclareThis(Swap_t);
ssize_t result; ssize_t result;
char *swapping = malloc( len ); char *swapping = malloc( len );
memcpy( swapping, buf, len ); memcpy( swapping, buf, len );
swap_buffer( swapping, len ); swap_buffer( swapping, len );
result = WRITES(This->Next, swapping, where, len); result = PWRITES(This->head.Next, swapping, where, len);
free(swapping); free(swapping);
return result; return result;
} }
static Class_t SwapClass = { static Class_t SwapClass = {
swap_read, 0,
swap_write, 0,
swap_pread,
swap_pwrite,
0, /* flush */ 0, /* flush */
0, /* free */ 0, /* free */
set_geom_pass_through, /* set_geom */ set_geom_pass_through, /* set_geom */
0, /* get_data */ 0, /* get_data */
0, /* pre-allocate */ 0, /* pre-allocate */
get_dosConvert_pass_through, /* dos convert */ get_dosConvert_pass_through, /* dos convert */
0, /* discard */ 0, /* discard */
}; };
Stream_t *OpenSwap(Stream_t *Next) { Stream_t *OpenSwap(Stream_t *Next) {
Swap_t *This; Swap_t *This;
This = New(Swap_t); This = New(Swap_t);
if (!This){ if (!This){
printOom(); printOom();
return 0; return 0;
} }
memset((void*)This, 0, sizeof(Swap_t)); memset((void*)This, 0, sizeof(Swap_t));
This->Class = &SwapClass; init_head(&This->head, &SwapClass, Next);
This->refs = 1;
This->Next = Next;
return (Stream_t *) This; return &This->head;
} }
 End of changes. 8 change blocks. 
16 lines changed or deleted 12 lines changed or added

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