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/*
* io_file.c
*
* Implements the file interface.
*
* As will all I/O modules, most functions are for local use only (called
* via function pointers in the I/O context).
*
* Most functions are just 'wrappers' for standard file functions.
*
* Written/Modified 1999, Philip Warner.
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
/* For platforms with incomplete ANSI defines. Fortunately,
* SEEK_SET is defined to be zero by the standard. */
#ifndef SEEK_SET
# define SEEK_SET 0
#endif /* SEEK_SET */
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include "gd.h"
#include "gdhelpers.h"
/* this is used for creating images in main memory */
typedef struct fileIOCtx {
gdIOCtx ctx;
FILE *f;
}
fileIOCtx;
gdIOCtxPtr newFileCtx(FILE *f);
static int fileGetbuf(gdIOCtxPtr, void *, int);
static int filePutbuf(gdIOCtxPtr, const void *, int);
static void filePutchar(gdIOCtxPtr, int);
static int fileGetchar(gdIOCtxPtr ctx);
static int fileSeek(gdIOCtxPtr, const int);
static long fileTell(gdIOCtxPtr);
static void gdFreeFileCtx(gdIOCtxPtr ctx);
/*
Function: gdNewFileCtx
Return data as a dynamic pointer.
*/
BGD_DECLARE(gdIOCtxPtr) gdNewFileCtx(FILE *f)
{
fileIOCtx *ctx;
if (f == NULL) return NULL;
ctx = (fileIOCtx *)gdMalloc(sizeof(fileIOCtx));
if(ctx == NULL) {
return NULL;
}
ctx->f = f;
ctx->ctx.getC = fileGetchar;
ctx->ctx.putC = filePutchar;
ctx->ctx.getBuf = fileGetbuf;
ctx->ctx.putBuf = filePutbuf;
ctx->ctx.tell = fileTell;
ctx->ctx.seek = fileSeek;
ctx->ctx.gd_free = gdFreeFileCtx;
return (gdIOCtxPtr)ctx;
}
static void gdFreeFileCtx(gdIOCtxPtr ctx)
{
gdFree(ctx);
}
static int filePutbuf(gdIOCtxPtr ctx, const void *buf, int size)
{
fileIOCtx *fctx;
fctx = (fileIOCtx *)ctx;
return fwrite(buf, 1, size, fctx->f);
}
static int fileGetbuf(gdIOCtxPtr ctx, void *buf, int size)
{
fileIOCtx *fctx;
fctx = (fileIOCtx *)ctx;
return (fread(buf, 1, size, fctx->f));
}
static void filePutchar(gdIOCtxPtr ctx, int a)
{
unsigned char b;
fileIOCtx *fctx;
fctx = (fileIOCtx *)ctx;
b = a;
putc(b, fctx->f);
}
static int fileGetchar(gdIOCtxPtr ctx)
{
fileIOCtx *fctx;
fctx = (fileIOCtx *)ctx;
return getc(fctx->f);
}
static int fileSeek(gdIOCtxPtr ctx, const int pos)
{
fileIOCtx *fctx;
fctx = (fileIOCtx *)ctx;
return (fseek(fctx->f, pos, SEEK_SET) == 0);
}
static long fileTell(gdIOCtxPtr ctx)
{
fileIOCtx *fctx;
fctx = (fileIOCtx *)ctx;
return ftell(fctx->f);
}
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