From 781417a36997548c54c445c0e2e9634e69b0e0c6 Mon Sep 17 00:00:00 2001
From: Filipe Calasans <filipe.calasans@gmail.com>
Date: Fri, 7 Feb 2020 14:52:25 -0800
Subject: [PATCH] Implement -m option with legacy format on cli

---
 programs/lz4cli.c | 11 +++++++++--
 programs/lz4io.c  | 51 +++++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 58 insertions(+), 4 deletions(-)

diff --git a/programs/lz4cli.c b/programs/lz4cli.c
index aadccab..67dcaa1 100644
--- a/programs/lz4cli.c
+++ b/programs/lz4cli.c
@@ -94,7 +94,10 @@ static unsigned displayLevel = 2;   /* 0 : no display ; 1: errors only ; 2 : dow
 #define DEFAULT_COMPRESSOR   LZ4IO_compressFilename
 #define DEFAULT_DECOMPRESSOR LZ4IO_decompressFilename
 int LZ4IO_compressFilename_Legacy(LZ4IO_prefs_t* const prefs, const char* input_filename, const char* output_filename, int compressionlevel);   /* hidden function */
-
+int LZ4IO_compressMultipleFilenames_Legacy(LZ4IO_prefs_t* const prefs,
+                            const char** inFileNamesTable, int ifntSize,
+                            const char* suffix,
+                            int compressionLevel);
 
 /*-***************************
 *  Functions
@@ -754,7 +757,11 @@ int main(int argc, const char** argv)
     } else {   /* compression is default action */
         if (legacy_format) {
             DISPLAYLEVEL(3, "! Generating LZ4 Legacy format (deprecated) ! \n");
-            LZ4IO_compressFilename_Legacy(prefs, input_filename, output_filename, cLevel);
+            if(multiple_inputs){
+                LZ4IO_compressMultipleFilenames_Legacy(prefs, inFileNames, (int)ifnIdx, !strcmp(output_filename,stdoutmark) ? stdoutmark : LZ4_EXTENSION, cLevel);
+            } else {
+                LZ4IO_compressFilename_Legacy(prefs, input_filename, output_filename, cLevel);
+            }
         } else {
             if (multiple_inputs) {
                 assert(ifnIdx <= INT_MAX);
diff --git a/programs/lz4io.c b/programs/lz4io.c
index ec6dc7f..7926b20 100644
--- a/programs/lz4io.c
+++ b/programs/lz4io.c
@@ -470,11 +470,59 @@ int LZ4IO_compressFilename_Legacy(LZ4IO_prefs_t* const prefs, const char* input_
     free(in_buff);
     free(out_buff);
     fclose(finput);
-    fclose(foutput);
+    if (strcmp(output_filename,stdoutmark)) fclose(foutput);   /* do not close stdout */
 
     return 0;
 }
 
+#define FNSPACE 30
+/* LZ4IO_compressMultipleFilenames_Legacy :
+ * This function is intentionally "hidden" (not published in .h)
+ * It generates multiple compressed streams using the old 'legacy' format */
+int LZ4IO_compressMultipleFilenames_Legacy(LZ4IO_prefs_t* const prefs,
+                            const char** inFileNamesTable, int ifntSize,
+                            const char* suffix,
+                            int compressionLevel)
+{
+    int i;
+    int missed_files = 0;
+    char* dstFileName = (char*)malloc(FNSPACE);
+    size_t ofnSize = FNSPACE;
+    const size_t suffixSize = strlen(suffix);
+
+    if (dstFileName == NULL) return ifntSize;   /* not enough memory */
+
+    /* loop on each file */
+    for (i=0; i<ifntSize; i++) {
+        size_t const ifnSize = strlen(inFileNamesTable[i]);
+        if (!strcmp(suffix, stdoutmark)) {
+            missed_files += LZ4IO_compressFilename_Legacy(prefs,
+                                    inFileNamesTable[i], stdoutmark,
+                                    compressionLevel);
+            continue;
+        }
+
+        if (ofnSize <= ifnSize+suffixSize+1) {
+            free(dstFileName);
+            ofnSize = ifnSize + 20;
+            dstFileName = (char*)malloc(ofnSize);
+            if (dstFileName==NULL) {
+                return ifntSize;
+        }   }
+        strcpy(dstFileName, inFileNamesTable[i]);
+        strcat(dstFileName, suffix);
+
+        missed_files += LZ4IO_compressFilename_Legacy(prefs,
+                                inFileNamesTable[i], dstFileName,
+                                compressionLevel);
+    }
+
+    /* Close & Free */
+    free(dstFileName);
+
+    return missed_files;
+}
+
 
 /*********************************************
 *  Compression using Frame format
@@ -749,7 +797,6 @@ int LZ4IO_compressFilename(LZ4IO_prefs_t* const prefs, const char* srcFileName,
 }
 
 
-#define FNSPACE 30
 int LZ4IO_compressMultipleFilenames(LZ4IO_prefs_t* const prefs,
                               const char** inFileNamesTable, int ifntSize,
                               const char* suffix,
-- 
2.7.4