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Code Issues Releases 1 Activity

Fixed a bug in the educational decoder

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Credit to Igor Pavlov
This commit is contained in:
Yann Collet 2023-05-27 11:22:30 -07:00
parent 5059618295
commit 5108c9ac97
1 changed files with 6 additions and 4 deletions
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10
doc/educational_decoder/zstd_decompress.c
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@ -997,7 +997,8 @@ static void decompress_sequences(frame_context_t *const ctx,
const size_t num_sequences);
static sequence_command_t decode_sequence(sequence_states_t *const state,
const u8 *const src,
i64 *const offset);
i64 *const offset,
int lastSequence);
static void decode_seq_table(FSE_dtable *const table, istream_t *const in,
const seq_part_t type, const seq_mode_t mode);
@ -1114,7 +1115,7 @@ static void decompress_sequences(frame_context_t *const ctx, istream_t *in,
for (size_t i = 0; i < num_sequences; i++) {
// Decode sequences one by one
sequences[i] = decode_sequence(&states, src, &bit_offset);
sequences[i] = decode_sequence(&states, src, &bit_offset, i==num_sequences-1);
}
if (bit_offset != 0) {
@ -1125,7 +1126,8 @@ static void decompress_sequences(frame_context_t *const ctx, istream_t *in,
// Decode a single sequence and update the state
static sequence_command_t decode_sequence(sequence_states_t *const states,
const u8 *const src,
i64 *const offset) {
i64 *const offset,
int lastSequence) {
// "Each symbol is a code in its own context, which specifies Baseline and
// Number_of_Bits to add. Codes are FSE compressed, and interleaved with raw
// additional bits in the same bitstream."
@ -1160,7 +1162,7 @@ static sequence_command_t decode_sequence(sequence_states_t *const states,
// Literals_Length_State is updated, followed by Match_Length_State, and
// then Offset_State."
// If the stream is complete don't read bits to update state
if (*offset != 0) {
if (!lastSequence) {
FSE_update_state(&states->ll_table, &states->ll_state, src, offset);
FSE_update_state(&states->ml_table, &states->ml_state, src, offset);
FSE_update_state(&states->of_table, &states->of_state, src, offset);