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memory.h
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memory.h
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#ifndef _rtech1_3ac0ba2587944345f2241085269c24f8
#define _rtech1_3ac0ba2587944345f2241085269c24f8
#ifdef USE_ALLEGRO
#include <allegro.h>
namespace Memory{
struct memory{
memory(unsigned char * stream, int length):
stream(stream),
position(stream),
length(length){
}
int getSize() const {
return position - stream;
}
/* points to the head */
unsigned char * stream;
/* points to the current position */
unsigned char * position;
int length;
};
static int pf_fclose(void *userdata){
return 0;
/* nothing */
}
static int pf_getc(void *userdata){
memory * m = (memory*) userdata;
if (m->position < m->stream + m->length){
unsigned char x = *m->position;
m->position += 1;
return x;
}
return EOF;
}
static int pf_ungetc(int c, void *userdata){
memory * m = (memory*) userdata;
if (m->position > m->stream){
m->position -= 1;
return c;
} else {
return EOF;
}
}
static long pf_fread(void *p, long n, void *userdata){
memory *m = (memory*) userdata;
unsigned char *cp = (unsigned char *)p;
long i;
int c;
for (i=0; i<n; i++) {
if ((c = pf_getc(m)) == EOF)
break;
*(cp++) = c;
}
return i;
}
static int pf_putc(int c, void *userdata){
memory * m = (memory*) userdata;
if (m->position < m->stream + m->length){
*m->position = c;
m->position += 1;
return c;
}
return EOF;
}
static long pf_fwrite(const void *p, long n, void *userdata){
memory *m = (memory*) userdata;
const unsigned char * cp = (const unsigned char *) p;
long i;
int c;
/* probably should replace this with memcpy */
for (i=0; i<n; i++) {
if ((c = pf_putc(cp[i], userdata)) == EOF)
break;
}
return i;
}
static int pf_fseek(void *userdata, int offset){
memory * m = (memory*) userdata;
if (offset >= 0 && m->position + offset < m->stream + m->length){
m->position += offset;
return 0;
} else {
return -1;
}
}
static int pf_feof(void *userdata){
memory * m = (memory*) userdata;
return m->position >= m->stream + m->length;
}
static int pf_ferror(void *userdata){
memory * m = (memory*) userdata;
return m->position < m->stream || m->position >= m->stream + m->length;
}
static PACKFILE_VTABLE makeTable(){
PACKFILE_VTABLE table;
table.pf_fclose = Memory::pf_fclose;
table.pf_getc = Memory::pf_getc;
table.pf_ungetc = Memory::pf_ungetc;
table.pf_fread = Memory::pf_fread;
table.pf_putc = Memory::pf_putc;
table.pf_fwrite = Memory::pf_fwrite;
table.pf_fseek = Memory::pf_fseek;
table.pf_feof = Memory::pf_feof;
table.pf_ferror = Memory::pf_ferror;
return table;
}
}
#endif
#endif

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