# HG changeset patch
# User Matti Hamalainen <ccr@tnsp.org>
# Date 1526059636 -10800
# Node ID 4fd4e7a00db42ac2512dcad8abc59aedda8c438c
# Parent  3265175b24d292c00e1e474071eb8a2e87afbd5a
Fix handling of predefined DMGrowBuffer in  dmC64EncodeGenericBMP().

diff -r 3265175b24d2 -r 4fd4e7a00db4 tools/lib64gfx.c
--- a/tools/lib64gfx.c	Fri May 11 20:18:14 2018 +0300
+++ b/tools/lib64gfx.c	Fri May 11 20:27:16 2018 +0300
@@ -697,6 +697,7 @@
 int dmC64EncodeGenericBMP(const BOOL allocate, DMGrowBuf *buf, const DMC64Image *img, const DMC64ImageFormat *fmt)
 {
     int res = DMERR_OK;
+    size_t boffs;
 
     if (img == NULL || fmt == NULL)
         return DMERR_NULLPTR;
@@ -710,6 +711,8 @@
         goto err;
     }
 
+    boffs = buf->len;
+
     // Perform encoding
     for (int i = 0; i < D64_MAX_ENCDEC_OPS; i++)
     {
@@ -735,7 +738,7 @@
         }
 
         // Do we need to reallocate some more space?
-        chksize = op->offs + size;
+        chksize = op->offs + size + boffs;
         if (!dmGrowBufCheckGrow(buf, chksize))
         {
             res = dmError(DMERR_MALLOC,
@@ -748,7 +751,7 @@
             buf->len = chksize;
 
         // Perform operation
-        Uint8 *dst = buf->data + op->offs;
+        Uint8 *dst = buf->data + boffs + op->offs;
         switch (op->type)
         {
             case DT_COLOR_RAM:   memcpy(dst, img->color[op->bank], size); break;