From 16bf20fad4faa9182d633d1833756c38c72e6ff4 Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Wed, 31 Jul 2024 09:32:35 -0400
Subject: [PATCH] read/write in chunks

---
 magick/blob.c             | 4 ++--
 magick/blob.h             | 2 +-
 magick/cache.c            | 8 ++++----
 magick/distribute-cache.c | 4 ++--
 magick/matrix.c           | 8 ++++----
 magick/string.c           | 2 +-
 magick/xml-tree.c         | 2 +-
 7 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/magick/blob.c b/magick/blob.c
index b961945ce..f1d149c7c 100644
--- a/magick/blob.c
+++ b/magick/blob.c
@@ -279,7 +279,7 @@ MagickExport MagickBooleanType BlobToFile(char *filename,const void *blob,
   for (i=0; i < length; i+=(size_t) count)
   {
     count=write(file,(const char *) blob+i,MagickMin(length-i,(size_t)
-      MAGICK_SSIZE_MAX));
+      MagickMaxBufferExtent));
     if (count <= 0)
       {
         count=0;
@@ -1235,7 +1235,7 @@ MagickExport unsigned char *FileToBlob(const char *filename,const size_t extent,
       for (i=0; i < *length; i+=count)
       {
         count=read(file,blob+i,(size_t) MagickMin(*length-i,(size_t)
-          MAGICK_SSIZE_MAX));
+          MagickMaxBufferExtent));
         if (count <= 0)
           {
             count=0;
diff --git a/magick/blob.h b/magick/blob.h
index fc8154a27..5b845d6bd 100644
--- a/magick/blob.h
+++ b/magick/blob.h
@@ -25,7 +25,7 @@
 extern "C" {
 #endif
 
-#define MagickMaxBufferExtent  81920
+#define MagickMaxBufferExtent  524288
 #define MagickMinBufferExtent  16384
 
 typedef enum
diff --git a/magick/cache.c b/magick/cache.c
index afd21363d..6a0b70de4 100644
--- a/magick/cache.c
+++ b/magick/cache.c
@@ -3800,10 +3800,10 @@ static inline MagickOffsetType WritePixelCacheRegion(
   {
 #if !defined(MAGICKCORE_HAVE_PWRITE)
     count=write(cache_info->file,buffer+i,(size_t) MagickMin(length-
-      (MagickSizeType) i,MAGICK_SSIZE_MAX));
+      (MagickSizeType) i,MagickMaxBufferExtent));
 #else
     count=pwrite(cache_info->file,buffer+i,(size_t) MagickMin(length-
-      (MagickSizeType) i,MAGICK_SSIZE_MAX),offset+i);
+      (MagickSizeType) i,MagickMaxBufferExtent),offset+i);
 #endif
     if (count <= 0)
       {
@@ -4629,10 +4629,10 @@ static inline MagickOffsetType ReadPixelCacheRegion(
   {
 #if !defined(MAGICKCORE_HAVE_PREAD)
     count=read(cache_info->file,buffer+i,(size_t) MagickMin(length-
-      (MagickSizeType) i,(size_t) MAGICK_SSIZE_MAX));
+      (MagickSizeType) i,(size_t) MagickMaxBufferExtent));
 #else
     count=pread(cache_info->file,buffer+i,(size_t) MagickMin(length-
-      (MagickSizeType) i,(size_t) MAGICK_SSIZE_MAX),offset+i);
+      (MagickSizeType) i,(size_t) MagickMaxBufferExtent),offset+i);
 #endif
     if (count <= 0)
       {
diff --git a/magick/distribute-cache.c b/magick/distribute-cache.c
index beda933d6..b70f16d1b 100755
--- a/magick/distribute-cache.c
+++ b/magick/distribute-cache.c
@@ -159,7 +159,7 @@ static inline MagickOffsetType dpc_read(int file,const MagickSizeType length,
   for (i=0; i < (MagickOffsetType) length; i+=count)
   {
     count=recv(file,(char *) message+i,(LENGTH_TYPE) MagickMin(length-i,
-      (MagickSizeType) MAGICK_SSIZE_MAX),0);
+      (MagickSizeType) MagickMaxBufferExtent),0);
     if (count <= 0)
       {
         count=0;
@@ -455,7 +455,7 @@ static inline MagickOffsetType dpc_send(int file,const MagickSizeType length,
   for (i=0; i < (MagickOffsetType) length; i+=count)
   {
     count=(MagickOffsetType) send(file,(char *) message+i,(LENGTH_TYPE)
-      MagickMin(length-i,(MagickSizeType) MAGICK_SSIZE_MAX),MSG_NOSIGNAL);
+      MagickMin(length-i,(MagickSizeType) MagickMaxBufferExtent),MSG_NOSIGNAL);
     if (count <= 0)
       {
         count=0;
diff --git a/magick/matrix.c b/magick/matrix.c
index 7d525620d..e851284d2 100644
--- a/magick/matrix.c
+++ b/magick/matrix.c
@@ -150,10 +150,10 @@ static inline MagickOffsetType WriteMatrixElements(
   {
 #if !defined(MAGICKCORE_HAVE_PWRITE)
     count=write(matrix_info->file,buffer+i,(size_t) MagickMin(length-i,
-      (MagickSizeType) MAGICK_SSIZE_MAX));
+      (MagickSizeType) MagickMaxBufferExtent));
 #else
     count=pwrite(matrix_info->file,buffer+i,(size_t) MagickMin(length-i,
-      (MagickSizeType) MAGICK_SSIZE_MAX),(off_t) (offset+i));
+      (MagickSizeType) MagickMaxBufferExtent),(off_t) (offset+i));
 #endif
     if (count <= 0)
       {
@@ -683,10 +683,10 @@ static inline MagickOffsetType ReadMatrixElements(
   {
 #if !defined(MAGICKCORE_HAVE_PREAD)
     count=read(matrix_info->file,buffer+i,(size_t) MagickMin(length-i,
-      (MagickSizeType) MAGICK_SSIZE_MAX));
+      (MagickSizeType) MagickMaxBufferExtent));
 #else
     count=pread(matrix_info->file,buffer+i,(size_t) MagickMin(length-i,
-      (MagickSizeType) MAGICK_SSIZE_MAX),(off_t) (offset+i));
+      (MagickSizeType) MagickMaxBufferExtent),(off_t) (offset+i));
 #endif
     if (count <= 0)
       {
diff --git a/magick/string.c b/magick/string.c
index ca07db4c6..6107d15fe 100644
--- a/magick/string.c
+++ b/magick/string.c
@@ -659,7 +659,7 @@ MagickExport StringInfo *ConfigureFileToStringInfo(const char *filename)
       for (i=0; i < length; i+=count)
       {
         count=read(file,string+i,(size_t) MagickMin(length-i,(size_t)
-          MAGICK_SSIZE_MAX));
+          MagickMaxBufferExtent));
         if (count <= 0)
           {
             count=0;
diff --git a/magick/xml-tree.c b/magick/xml-tree.c
index 75fd2db15..68eea8fff 100644
--- a/magick/xml-tree.c
+++ b/magick/xml-tree.c
@@ -688,7 +688,7 @@ MagickPrivate char *FileToXML(const char *filename,const size_t extent)
       (void) lseek(file,0,SEEK_SET);
       for (i=0; i < length; i+=count)
       {
-        count=read(file,xml+i,(size_t) MagickMin(length-i,(size_t) MAGICK_SSIZE_MAX));
+        count=read(file,xml+i,(size_t) MagickMin(length-i,(size_t) MagickMaxBufferExtent));
         if (count <= 0)
           {
             count=0;