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/*
* zio.c
* a generic input stream interface
* $Id: zio.c,v 1.1 1997/06/16 16:50:22 roberto Exp roberto $
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "zio.h"
/* ----------------------------------------------------- memory buffers --- */
static int zmfilbuf(ZIO* z)
{
return EOZ;
}
ZIO* zmopen(ZIO* z, char* b, int size)
{
if (b==NULL) return NULL;
z->n=size;
z->p= (unsigned char *)b;
z->filbuf=zmfilbuf;
z->u=NULL;
return z;
}
/* ------------------------------------------------------------ strings --- */
ZIO* zsopen(ZIO* z, char* s)
{
if (s==NULL) return NULL;
return zmopen(z,s,strlen(s));
}
/* -------------------------------------------------------------- FILEs --- */
static int zffilbuf(ZIO* z)
{
int n=fread(z->buffer,1,ZBSIZE,z->u);
if (n==0) return EOZ;
z->n=n-1;
z->p=z->buffer;
return *(z->p++);
}
ZIO* zFopen(ZIO* z, FILE* f)
{
if (f==NULL) return NULL;
z->n=0;
z->p=z->buffer;
z->filbuf=zffilbuf;
z->u=f;
return z;
}
/* --------------------------------------------------------------- read --- */
int zread(ZIO *z, void *b, int n)
{
while (n) {
int m;
if (z->n == 0) {
if (z->filbuf(z) == EOZ)
return n; /* retorna quantos faltaram ler */
zungetc(z); /* poe o resultado de filbuf no buffer */
}
m = (n <= z->n) ? n : z->n; /* minimo de n e z->n */
memcpy(b, z->p, m);
z->n -= m;
z->p += m;
b = (char *)b + m;
n -= m;
}
return 0;
}
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