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-rw-r--r--src/liblzma/api/lzma/lzma.h10
-rw-r--r--src/liblzma/lzma/lzma_decoder.c57
-rw-r--r--src/liblzma/lzma/lzma_encoder_init.c13
-rw-r--r--src/liblzma/lzma/lzma_encoder_private.h2
-rw-r--r--src/liblzma/lzma/lzma_literal.c39
-rw-r--r--src/liblzma/lzma/lzma_literal.h13
6 files changed, 43 insertions, 91 deletions
diff --git a/src/liblzma/api/lzma/lzma.h b/src/liblzma/api/lzma/lzma.h
index da0bb52d..9473f448 100644
--- a/src/liblzma/api/lzma/lzma.h
+++ b/src/liblzma/api/lzma/lzma.h
@@ -167,7 +167,7 @@ typedef struct {
*/
uint32_t literal_context_bits;
# define LZMA_LITERAL_CONTEXT_BITS_MIN 0
-# define LZMA_LITERAL_CONTEXT_BITS_MAX 8
+# define LZMA_LITERAL_CONTEXT_BITS_MAX 4
# define LZMA_LITERAL_CONTEXT_BITS_DEFAULT 3
/**
@@ -279,6 +279,14 @@ typedef struct {
/**
+ * \brief Maximum sum of literal_context_bits and literal_pos_bits
+ *
+ * literal_context_bits + literal_pos_bits <= LZMA_LITERAL_BITS_MAX
+ */
+#define LZMA_LITERAL_BITS_MAX 4
+
+
+/**
* \brief Available LZMA encoding modes
*
* Pointer to an array containing the list of available encoding modes.
diff --git a/src/liblzma/lzma/lzma_decoder.c b/src/liblzma/lzma/lzma_decoder.c
index d4cefe0b..68941021 100644
--- a/src/liblzma/lzma/lzma_decoder.c
+++ b/src/liblzma/lzma/lzma_decoder.c
@@ -115,7 +115,7 @@ struct lzma_coder_s {
uint32_t pos_mask;
uint32_t now_pos; // Lowest 32-bits are enough here.
- lzma_literal_coder *literal_coder;
+ lzma_literal_coder literal_coder;
/// If 1, it's a match. Otherwise it's a single 8-bit literal.
probability is_match[STATES][POS_STATES_MAX];
@@ -651,7 +651,6 @@ lzma_decoder_end(lzma_coder *coder, lzma_allocator *allocator)
{
lzma_next_coder_end(&coder->next, allocator);
lzma_lz_decoder_end(&coder->lz, allocator);
- lzma_literal_end(&coder->literal_coder, allocator);
lzma_free(coder, allocator);
return;
}
@@ -661,6 +660,9 @@ extern lzma_ret
lzma_lzma_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
const lzma_filter_info *filters)
{
+ // LZMA can only be the last filter in the chain.
+ assert(filters[1].init == NULL);
+
// Validate pos_bits. Other options are validated by the
// respective initialization functions.
const lzma_options_lzma *options = filters[0].options;
@@ -673,43 +675,25 @@ lzma_lzma_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
if (next->coder == NULL)
return LZMA_MEM_ERROR;
- // Initialize variables so that we know later that we don't
- // have an existing decoder initialized.
+ next->code = &lzma_lz_decode;
+ next->end = &lzma_decoder_end;
next->coder->next = LZMA_NEXT_CODER_INIT;
next->coder->lz = LZMA_LZ_DECODER_INIT;
- next->coder->literal_coder = NULL;
}
// Store the pos_bits and calculate pos_mask.
next->coder->pos_bits = options->pos_bits;
next->coder->pos_mask = (1U << next->coder->pos_bits) - 1;
- // Allocate (if needed) and initialize the literal decoder.
- {
- const lzma_ret ret = lzma_literal_init(
- &next->coder->literal_coder, allocator,
+ // Initialize the literal decoder.
+ return_if_error(lzma_literal_init(&next->coder->literal_coder,
options->literal_context_bits,
- options->literal_pos_bits);
- if (ret != LZMA_OK) {
- lzma_free(next->coder, allocator);
- next->coder = NULL;
- return ret;
- }
- }
+ options->literal_pos_bits));
// Allocate and initialize the LZ decoder.
- {
- const lzma_ret ret = lzma_lz_decoder_reset(
- &next->coder->lz, allocator, &decode_real,
- options->dictionary_size, MATCH_MAX_LEN);
- if (ret != LZMA_OK) {
- lzma_literal_end(&next->coder->literal_coder,
- allocator);
- lzma_free(next->coder, allocator);
- next->coder = NULL;
- return ret;
- }
- }
+ return_if_error(lzma_lz_decoder_reset(&next->coder->lz, allocator,
+ &decode_real, options->dictionary_size,
+ MATCH_MAX_LEN));
// State
next->coder->state = 0;
@@ -769,20 +753,6 @@ lzma_lzma_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
next->coder->has_produced_output = false;
- // Initialize the next decoder in the chain, if any.
- {
- const lzma_ret ret = lzma_next_filter_init(&next->coder->next,
- allocator, filters + 1);
- if (ret != LZMA_OK) {
- lzma_decoder_end(next->coder, allocator);
- return ret;
- }
- }
-
- // Initialization successful. Set the function pointers.
- next->code = &lzma_lz_decode;
- next->end = &lzma_decoder_end;
-
return LZMA_OK;
}
@@ -808,5 +778,6 @@ lzma_lzma_decode_properties(lzma_options_lzma *options, uint8_t byte)
options->literal_pos_bits = byte / 9;
options->literal_context_bits = byte - options->literal_pos_bits * 9;
- return false;
+ return options->literal_context_bits + options->literal_pos_bits
+ > LZMA_LITERAL_BITS_MAX;
}
diff --git a/src/liblzma/lzma/lzma_encoder_init.c b/src/liblzma/lzma/lzma_encoder_init.c
index c925f811..21335f95 100644
--- a/src/liblzma/lzma/lzma_encoder_init.c
+++ b/src/liblzma/lzma/lzma_encoder_init.c
@@ -52,7 +52,6 @@ static void
lzma_lzma_encoder_end(lzma_coder *coder, lzma_allocator *allocator)
{
lzma_lz_encoder_end(&coder->lz, allocator);
- lzma_literal_end(&coder->literal_coder, allocator);
lzma_free(coder, allocator);
return;
}
@@ -69,7 +68,6 @@ lzma_lzma_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
next->coder->next = LZMA_NEXT_CODER_INIT;
next->coder->lz = LZMA_LZ_ENCODER_INIT;
- next->coder->literal_coder = NULL;
}
// Validate options that aren't validated elsewhere.
@@ -99,13 +97,11 @@ lzma_lzma_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
// Initialize literal coder.
{
const lzma_ret ret = lzma_literal_init(
- &next->coder->literal_coder, allocator,
+ &next->coder->literal_coder,
options->literal_context_bits,
options->literal_pos_bits);
- if (ret != LZMA_OK) {
- lzma_lzma_encoder_end(next->coder, allocator);
+ if (ret != LZMA_OK)
return ret;
- }
}
// Initialize LZ encoder.
@@ -218,7 +214,10 @@ lzma_lzma_encode_properties(const lzma_options_lzma *options, uint8_t *byte)
if (options->literal_context_bits > LZMA_LITERAL_CONTEXT_BITS_MAX
|| options->literal_pos_bits
> LZMA_LITERAL_POS_BITS_MAX
- || options->pos_bits > LZMA_POS_BITS_MAX)
+ || options->pos_bits > LZMA_POS_BITS_MAX
+ || options->literal_context_bits
+ + options->literal_pos_bits
+ > LZMA_LITERAL_BITS_MAX)
return true;
*byte = (options->pos_bits * 5 + options->literal_pos_bits) * 9
diff --git a/src/liblzma/lzma/lzma_encoder_private.h b/src/liblzma/lzma/lzma_encoder_private.h
index 4159b468..a16051f8 100644
--- a/src/liblzma/lzma/lzma_encoder_private.h
+++ b/src/liblzma/lzma/lzma_encoder_private.h
@@ -95,7 +95,7 @@ struct lzma_coder_s {
bool write_eopm;
// Literal encoder
- lzma_literal_coder *literal_coder;
+ lzma_literal_coder literal_coder;
// Bit encoders
probability is_match[STATES][POS_STATES_MAX];
diff --git a/src/liblzma/lzma/lzma_literal.c b/src/liblzma/lzma/lzma_literal.c
index 8f650fbf..3611a1f7 100644
--- a/src/liblzma/lzma/lzma_literal.c
+++ b/src/liblzma/lzma/lzma_literal.c
@@ -22,7 +22,7 @@
extern lzma_ret
-lzma_literal_init(lzma_literal_coder **coder, lzma_allocator *allocator,
+lzma_literal_init(lzma_literal_coder *coder,
uint32_t literal_context_bits, uint32_t literal_pos_bits)
{
// Verify that arguments are sane.
@@ -34,41 +34,18 @@ lzma_literal_init(lzma_literal_coder **coder, lzma_allocator *allocator,
const uint32_t states = literal_states(
literal_pos_bits, literal_context_bits);
- // Allocate a new literal coder, if needed.
- if (*coder == NULL || (**coder).literal_context_bits
- != literal_context_bits
- || (**coder).literal_pos_bits != literal_pos_bits) {
- // Free the old coder, if any.
- lzma_free(*coder, allocator);
+ // Store the new settings.
+ coder->literal_context_bits = literal_context_bits;
+ coder->literal_pos_bits = literal_pos_bits;
- // Allocate a new one.
- *coder = lzma_alloc(sizeof(lzma_literal_coder)
- + states * LIT_SIZE * sizeof(probability),
- allocator);
- if (*coder == NULL)
- return LZMA_MEM_ERROR;
-
- // Store the new settings.
- (**coder).literal_context_bits = literal_context_bits;
- (**coder).literal_pos_bits = literal_pos_bits;
-
- // Calculate also the literal_pos_mask. It's not changed
- // anywhere else than here.
- (**coder).literal_pos_mask = (1 << literal_pos_bits) - 1;
- }
+ // Calculate also the literal_pos_mask. It's not changed
+ // anywhere else than here.
+ coder->literal_pos_mask = (1 << literal_pos_bits) - 1;
// Reset the literal coder.
for (uint32_t i = 0; i < states; ++i)
for (uint32_t j = 0; j < LIT_SIZE; ++j)
- bit_reset((**coder).coders[i][j]);
+ bit_reset(coder->coders[i][j]);
return LZMA_OK;
}
-
-
-extern void
-lzma_literal_end(lzma_literal_coder **coder, lzma_allocator *allocator)
-{
- lzma_free(*coder, allocator);
- *coder = NULL;
-}
diff --git a/src/liblzma/lzma/lzma_literal.h b/src/liblzma/lzma/lzma_literal.h
index 174f5ed4..208abd99 100644
--- a/src/liblzma/lzma/lzma_literal.h
+++ b/src/liblzma/lzma/lzma_literal.h
@@ -45,9 +45,9 @@
/// byte; and
/// - the highest literal_context_bits bits of the previous byte.
#define literal_get_subcoder(literal_coder, pos, prev_byte) \
- (literal_coder)->coders[(((pos) & (literal_coder)->literal_pos_mask) \
- << (literal_coder)->literal_context_bits) \
- + ((prev_byte) >> (8 - (literal_coder)->literal_context_bits))]
+ (literal_coder).coders[(((pos) & (literal_coder).literal_pos_mask) \
+ << (literal_coder).literal_context_bits) \
+ + ((prev_byte) >> (8 - (literal_coder).literal_context_bits))]
typedef struct {
@@ -59,16 +59,13 @@ typedef struct {
/// There are (1 << (literal_pos_bits + literal_context_bits))
/// literal coders.
- probability coders[][LIT_SIZE];
+ probability coders[1 << LZMA_LITERAL_BITS_MAX][LIT_SIZE];
} lzma_literal_coder;
extern lzma_ret lzma_literal_init(
- lzma_literal_coder **coder, lzma_allocator *allocator,
+ lzma_literal_coder *coder,
uint32_t literal_context_bits, uint32_t literal_pos_bits);
-extern void lzma_literal_end(
- lzma_literal_coder **coder, lzma_allocator *allocator);
-
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 19:28:36 +0000