gd_io.c

/*
* io.c
*
* Implements the imple 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.
*
*/

#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, 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"));
}