compression: Remove byte_left variable

We can simplify this code using the identity:
  byte_left + uncompressed_pos = uncompressed_size

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>

diff --git a/lib/compression/lzxpress.c b/lib/compression/lzxpress.c
index 9b059f99846334be6c270785eaacc14ccf982e3c..5e52fa8b669c820de3b7082b8537d70adafddc41 100644 (file)
--- a/lib/compression/lzxpress.c
+++ b/lib/compression/lzxpress.c
@@ -58,7 +58,7 @@ ssize_t lzxpress_compress(const uint8_t *uncompressed,
                          uint8_t *compressed,
                          uint32_t max_compressed_size)
 {
-       uint32_t uncompressed_pos, compressed_pos, byte_left;
+       uint32_t uncompressed_pos, compressed_pos;
        uint32_t max_offset, best_offset;
        int32_t offset;
        uint32_t max_len, len, best_len, match_len;
@@ -79,7 +79,6 @@ ssize_t lzxpress_compress(const uint8_t *uncompressed,
        compressed_pos = sizeof(uint32_t);
        indic_pos = 0;
 
-       byte_left = uncompressed_size;
        indic_bit = 0;
        nibble_index = 0;
 
@@ -104,7 +103,7 @@ ssize_t lzxpress_compress(const uint8_t *uncompressed,
                        str2 = &str1[-offset];
 
                        /* maximum len we can encode into metadata */
-                       max_len = MIN(0x1FFF, byte_left);
+                       max_len = MIN(0x1FFF, uncompressed_size - uncompressed_pos);
 
                        for (len = 0; (len < max_len) && (str1[len] == str2[len]); len++);
 
@@ -123,7 +122,6 @@ ssize_t lzxpress_compress(const uint8_t *uncompressed,
                        CHECK_INPUT_BYTES(sizeof(uint8_t));
                        CHECK_OUTPUT_BYTES(sizeof(uint8_t));
                        compressed[compressed_pos++] = uncompressed[uncompressed_pos++];
-                       byte_left--;
 
                        indic <<= 1;
                        indic_bit += 1;
@@ -201,7 +199,6 @@ ssize_t lzxpress_compress(const uint8_t *uncompressed,
                        }
 
                        uncompressed_pos += best_len;
-                       byte_left -= best_len;
                }
        }