root/libgd/gd_io.c

DEFINITIONS

1. Putword
2. Putchar
3. gdPutC
4. gdPutWord
5. gdPutInt
6. gdGetC
7. gdGetByte
8. gdGetWord
9. gdGetInt
10. gdPutBuf
11. gdGetBuf
12. gdSeek
13. gdTell

/*
   * 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.
   *
 */

#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)


#define GD_IO_EOF_CHK(r)        \
        if (r == EOF) {         \
                return 0;       \
        }                       \

/*
 * 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 (php_gd_error("Putting word..."));
        (ctx->putC) (ctx, (unsigned char) (w >> 8));
        (ctx->putC) (ctx, (unsigned char) (w & 0xFF));
        IO_DBG (php_gd_error("put."));
}

void gdPutInt (int w, gdIOCtx * ctx)
{
        IO_DBG (php_gd_error("Putting int..."));
        (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 (php_gd_error("put."));
}

int gdGetC (gdIOCtx * ctx)
{
        return ((ctx->getC) (ctx));
}

int gdGetByte (int *result, gdIOCtx * ctx)
{
        int r;
        r = (ctx->getC) (ctx);
        GD_IO_EOF_CHK(r);
        *result = r;
        return 1;
}

int gdGetWord (int *result, gdIOCtx * ctx)
{
        int r;
        r = (ctx->getC) (ctx);
        GD_IO_EOF_CHK(r);
        *result = r << 8;
        r = (ctx->getC) (ctx);
        GD_IO_EOF_CHK(r);
        *result += r;
        return 1;
}


int gdGetInt (int *result, gdIOCtx * ctx)
{
        int r;
        r = (ctx->getC) (ctx);
        GD_IO_EOF_CHK(r);
        *result = r << 24;

        r = (ctx->getC) (ctx);
        GD_IO_EOF_CHK(r);
        *result += r << 16;

        r = (ctx->getC) (ctx);
        if (r == EOF) {
                return 0;
        }
        *result += r << 8;

        r = (ctx->getC) (ctx);
        GD_IO_EOF_CHK(r);
        *result += r;

        return 1;
}

int gdPutBuf (const void *buf, int size, gdIOCtx * ctx)
{
        IO_DBG (php_gd_error("Putting buf..."));
        return (ctx->putBuf) (ctx, buf, size);
        IO_DBG (php_gd_error("put."));
}

int gdGetBuf (void *buf, int size, gdIOCtx * ctx)
{
        return (ctx->getBuf) (ctx, buf, size);
}

int gdSeek (gdIOCtx * ctx, const int pos)
{
        IO_DBG (php_gd_error("Seeking..."));
        return ((ctx->seek) (ctx, pos));
        IO_DBG (php_gd_error("Done."));
}

long gdTell (gdIOCtx * ctx)
{
        IO_DBG (php_gd_error("Telling..."));
        return ((ctx->tell) (ctx));
        IO_DBG (php_gd_error ("told."));
}