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/*
* io.c
*
* Implements the simple I/O 'helper' routines.
*
* Not really essential, but these routines were used extensively in GD,
* so they were moved here. They also make IOCtx calls look better...
*
* Written (or, at least, moved) 1999, Philip Warner.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include "gd.h"
/* Use this for commenting out debug-print statements. */
/* Just use the first '#define' to allow all the prints... */
/*#define IO_DBG(s) (s) */
#define IO_DBG(s)
/*
* Write out a word to the I/O context pointer
*/
void
Putword (int w, gdIOCtx * ctx)
{
unsigned char buf[2];
buf[0] = w & 0xff;
buf[1] = (w / 256) & 0xff;
(ctx->putBuf) (ctx, (char *) buf, 2);
}
void
Putchar (int c, gdIOCtx * ctx)
{
(ctx->putC) (ctx, c & 0xff);
}
void
gdPutC (const unsigned char c, gdIOCtx * ctx)
{
(ctx->putC) (ctx, c);
}
void
gdPutWord (int w, gdIOCtx * ctx)
{
IO_DBG (printf ("Putting word...\n"));
(ctx->putC) (ctx, (unsigned char) (w >> 8));
(ctx->putC) (ctx, (unsigned char) (w & 0xFF));
IO_DBG (printf ("put.\n"));
}
void
gdPutInt (int w, gdIOCtx * ctx)
{
IO_DBG (printf ("Putting int...\n"));
(ctx->putC) (ctx, (unsigned char) (w >> 24));
(ctx->putC) (ctx, (unsigned char) ((w >> 16) & 0xFF));
(ctx->putC) (ctx, (unsigned char) ((w >> 8) & 0xFF));
(ctx->putC) (ctx, (unsigned char) (w & 0xFF));
IO_DBG (printf ("put.\n"));
}
int
gdGetC (gdIOCtx * ctx)
{
return ((ctx->getC) (ctx));
}
int
gdGetByte (int *result, gdIOCtx * ctx)
{
int r;
r = (ctx->getC) (ctx);
if (r == EOF)
{
return 0;
}
*result = r;
return 1;
}
int
gdGetWord (int *result, gdIOCtx * ctx)
{
int r;
r = (ctx->getC) (ctx);
if (r == EOF)
{
return 0;
}
*result = r << 8;
r = (ctx->getC) (ctx);
if (r == EOF)
{
return 0;
}
*result += r;
return 1;
}
int
gdGetInt (int *result, gdIOCtx * ctx)
{
int r;
r = (ctx->getC) (ctx);
if (r == EOF)
{
return 0;
}
*result = r << 24;
r = (ctx->getC) (ctx);
if (r == EOF)
{
return 0;
}
*result += r << 16;
r = (ctx->getC) (ctx);
if (r == EOF)
{
return 0;
}
*result += r << 8;
r = (ctx->getC) (ctx);
if (r == EOF)
{
return 0;
}
*result += r;
return 1;
}
int
gdPutBuf (const void *buf, int size, gdIOCtx * ctx)
{
IO_DBG (printf ("Putting buf...\n"));
return (ctx->putBuf) (ctx, buf, size);
IO_DBG (printf ("put.\n"));
}
int
gdGetBuf (void *buf, int size, gdIOCtx * ctx)
{
return (ctx->getBuf) (ctx, buf, size);
}
int
gdSeek (gdIOCtx * ctx, const int pos)
{
IO_DBG (printf ("Seeking...\n"));
return ((ctx->seek) (ctx, pos));
IO_DBG (printf ("Done.\n"));
}
long
gdTell (gdIOCtx * ctx)
{
IO_DBG (printf ("Telling...\n"));
return ((ctx->tell) (ctx));
IO_DBG (printf ("told.\n"));
}
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