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/* _______ ____ __ ___ ___
* \ _ \ \ / \ / \ \ / / ' ' '
* | | \ \ | | || | \/ | . .
* | | | | | | || ||\ /| |
* | | | | | | || || \/ | | ' ' '
* | | | | | | || || | | . .
* | |_/ / \ \__// || | |
* /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
* / \
* / . \
* memfile.c - Module for reading data from / / \ \
* memory using a DUMBFILE. | < / \_
* | \/ /\ /
* By entheh. \_ / > /
* | \ / /
* | ' /
* \__/
*/
#include <stdlib.h>
#include <string.h>
#include "dumb.h"
typedef struct MEMFILE MEMFILE;
struct MEMFILE
{
const char *ptr;
long left;
};
static int dumb_memfile_skip(void *f, long n)
{
MEMFILE *m = f;
if (n > m->left) return -1;
m->ptr += n;
m->left -= n;
return 0;
}
static int dumb_memfile_getc(void *f)
{
MEMFILE *m = f;
if (m->left <= 0) return -1;
m->left--;
return *(const unsigned char *)m->ptr++;
}
static long dumb_memfile_getnc(char *ptr, long n, void *f)
{
MEMFILE *m = f;
if (n > m->left) n = m->left;
memcpy(ptr, m->ptr, n);
m->ptr += n;
m->left -= n;
return n;
}
static void dumb_memfile_close(void *f)
{
free(f);
}
static DUMBFILE_SYSTEM memfile_dfs = {
NULL,
&dumb_memfile_skip,
&dumb_memfile_getc,
&dumb_memfile_getnc,
&dumb_memfile_close
};
DUMBFILE *dumbfile_open_memory(const char *data, long size)
{
MEMFILE *m = malloc(sizeof(*m));
if (!m) return NULL;
m->ptr = data;
m->left = size;
return dumbfile_open_ex(m, &memfile_dfs);
}
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