static int dynamicSeek (struct gdIOCtx *ctx, const int pos)
{
int bytesNeeded;
dynamicPtr *dp;
dpIOCtx *dctx;
dctx = (dpIOCtx *) ctx;
dp = dctx->dp;
if (!dp->dataGood) {
return FALSE;
}
bytesNeeded = pos;
if (bytesNeeded > dp->realSize) {
/* 2.0.21 */
if (!dp->freeOK) {
return FALSE;
}
gdReallocDynamic (dp, dp->realSize * 2);
}
/* if we get here, we can be sure that we have enough bytes to copy safely */
/* Extend the logical size if we seek beyond EOF. */
if (pos > dp->logicalSize) {
dp->logicalSize = pos;
}
dp->pos = pos;
return TRUE;
}
/* append bytes to the end of a dynamic pointer */
static int appendDynamic (dynamicPtr * dp, const void *src, int size)
{
int bytesNeeded;
char *tmp;
if (!dp->dataGood) {
return FALSE;
}
/* bytesNeeded = dp->logicalSize + size; */
bytesNeeded = dp->pos + size;
if (bytesNeeded > dp->realSize) {
/* 2.0.21 */
if (!dp->freeOK) {
return FALSE;
}
gdReallocDynamic(dp, bytesNeeded * 2);
}
/* if we get here, we can be sure that we have enough bytes to copy safely */
/*printf("Mem OK Size: %d, Pos: %d\n", dp->realSize, dp->pos); */
tmp = (char *) dp->data;
memcpy((void *) (tmp + (dp->pos)), src, size);
dp->pos += size;
if (dp->pos > dp->logicalSize) {
dp->logicalSize = dp->pos;
}
return TRUE;
}
/* trim pointer so that its real and logical sizes match */
static int trimDynamic (dynamicPtr * dp)
{
/* 2.0.21: we don't reallocate memory we don't own */
if (!dp->freeOK) {
return FALSE;
}
return gdReallocDynamic(dp, dp->logicalSize);
}
/* trim pointer so that its real and logical sizes match */
static int
trimDynamic (dynamicPtr * dp)
{
return gdReallocDynamic (dp, dp->logicalSize);
}