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-rw-r--r--src/liblzma/common/block_encoder.c41
1 files changed, 19 insertions, 22 deletions
diff --git a/src/liblzma/common/block_encoder.c b/src/liblzma/common/block_encoder.c
index 3c678f7d..6468cb44 100644
--- a/src/liblzma/common/block_encoder.c
+++ b/src/liblzma/common/block_encoder.c
@@ -27,8 +27,8 @@
/// take into account the headers etc. to determine the exact maximum size
/// of the Compressed Data field, but the complexity would give us nothing
/// useful. Instead, limit the size of Compressed Data so that even with
-/// biggest possible Block Header and Check fields the total size of the
-/// Block stays as valid VLI. This way we don't produce incorrect output
+/// biggest possible Block Header and Check fields the total encoded size of
+/// the Block stays as valid VLI. This way we don't produce incorrect output
/// if someone will really try creating a Block of 8 EiB.
///
/// ~LZMA_VLI_C(3) is to guarantee that if we need padding at the end of
@@ -41,9 +41,9 @@ struct lzma_coder_s {
/// The filters in the chain; initialized with lzma_raw_decoder_init().
lzma_next_coder next;
- /// Encoding options; we also write Total Size, Compressed Size, and
- /// Uncompressed Size back to this structure when the encoding has
- /// been finished.
+ /// Encoding options; we also write Unpadded Size, Compressed Size,
+ /// and Uncompressed Size back to this structure when the encoding
+ /// has been finished.
lzma_block *options;
enum {
@@ -58,8 +58,8 @@ struct lzma_coder_s {
/// Uncompressed Size calculated while encoding
lzma_vli uncompressed_size;
- /// Position when writing out the Check field
- size_t check_pos;
+ /// Position in Block Padding and the Check fields
+ size_t pos;
/// Check of the uncompressed data
lzma_check_state check;
@@ -106,6 +106,11 @@ block_encode(lzma_coder *coder, lzma_allocator *allocator,
assert(*in_pos == in_size);
assert(action == LZMA_FINISH);
+ // Copy the values into coder->options. The caller
+ // may use this information to construct Index.
+ coder->options->compressed_size = coder->compressed_size;
+ coder->options->uncompressed_size = coder->uncompressed_size;
+
coder->sequence = SEQ_PADDING;
}
@@ -113,28 +118,21 @@ block_encode(lzma_coder *coder, lzma_allocator *allocator,
case SEQ_PADDING:
// Pad Compressed Data to a multiple of four bytes.
- while (coder->compressed_size & 3) {
+ while ((coder->compressed_size + coder->pos) & 3) {
if (*out_pos >= out_size)
return LZMA_OK;
out[*out_pos] = 0x00;
++*out_pos;
-
- // No need to use check for overflow here since we
- // have already checked in SEQ_CODE that Compressed
- // Size will stay in proper limits.
- ++coder->compressed_size;
+ ++coder->pos;
}
- // Copy the values into coder->options. The caller
- // may use this information to construct Index.
- coder->options->compressed_size = coder->compressed_size;
- coder->options->uncompressed_size = coder->uncompressed_size;
-
if (coder->options->check == LZMA_CHECK_NONE)
return LZMA_STREAM_END;
lzma_check_finish(&coder->check, coder->options->check);
+
+ coder->pos = 0;
coder->sequence = SEQ_CHECK;
// Fall through
@@ -144,11 +142,10 @@ block_encode(lzma_coder *coder, lzma_allocator *allocator,
= lzma_check_size(coder->options->check);
while (*out_pos < out_size) {
- out[*out_pos] = coder->check.buffer.u8[
- coder->check_pos];
+ out[*out_pos] = coder->check.buffer.u8[coder->pos];
++*out_pos;
- if (++coder->check_pos == check_size)
+ if (++coder->pos == check_size)
return LZMA_STREAM_END;
}
@@ -199,9 +196,9 @@ lzma_block_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
next->coder->options = options;
next->coder->compressed_size = 0;
next->coder->uncompressed_size = 0;
+ next->coder->pos = 0;
// Initialize the check
- next->coder->check_pos = 0;
lzma_check_init(&next->coder->check, options->check);
// Initialize the requested filters.