Initial Commit

openssl-1.0.2f/crypto/comp/c_rle.c

@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <openssl/objects.h>
+#include <openssl/comp.h>
+
+static int rle_compress_block(COMP_CTX *ctx, unsigned char *out,
+                              unsigned int olen, unsigned char *in,
+                              unsigned int ilen);
+static int rle_expand_block(COMP_CTX *ctx, unsigned char *out,
+                            unsigned int olen, unsigned char *in,
+                            unsigned int ilen);
+
+static COMP_METHOD rle_method = {
+    NID_rle_compression,
+    LN_rle_compression,
+    NULL,
+    NULL,
+    rle_compress_block,
+    rle_expand_block,
+    NULL,
+    NULL,
+};
+
+COMP_METHOD *COMP_rle(void)
+{
+    return (&rle_method);
+}
+
+static int rle_compress_block(COMP_CTX *ctx, unsigned char *out,
+                              unsigned int olen, unsigned char *in,
+                              unsigned int ilen)
+{
+    /* int i; */
+
+    if (ilen == 0 || olen < (ilen - 1)) {
+        /* ZZZZZZZZZZZZZZZZZZZZZZ */
+        return (-1);
+    }
+
+    *(out++) = 0;
+    memcpy(out, in, ilen);
+    return (ilen + 1);
+}
+
+static int rle_expand_block(COMP_CTX *ctx, unsigned char *out,
+                            unsigned int olen, unsigned char *in,
+                            unsigned int ilen)
+{
+    int i;
+
+    if (olen < (ilen - 1)) {
+        /* ZZZZZZZZZZZZZZZZZZZZZZ */
+        return (-1);
+    }
+
+    i = *(in++);
+    if (i == 0) {
+        memcpy(out, in, ilen - 1);
+    }
+    return (ilen - 1);
+}