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created separate function for copying literals during sequence execution

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This commit is contained in:
Paul Cruz
2017-08-14 14:05:16 -07:00
parent 93c1309fd4
commit b6d6be58c9
1 changed files with 22 additions and 15 deletions
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37
doc/educational_decoder/zstd_decompress.c
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@ -353,6 +353,9 @@ static void execute_sequences(frame_context_t *const ctx, ostream_t *const out,
const sequence_command_t *const sequences,
const size_t num_sequences);
static u32 copy_literals(sequence_command_t seq, istream_t *litstream,
ostream_t *const out);
/******* END ZSTD HELPER STRUCTS AND PROTOTYPES *******************************/
size_t ZSTD_decompress(void *const dst, const size_t dst_len,
@ -1256,23 +1259,10 @@ static void execute_sequences(frame_context_t *const ctx, ostream_t *const out,
for (size_t i = 0; i < num_sequences; i++) {
const sequence_command_t seq = sequences[i];
{
// If the sequence asks for more literals than are left, the
// sequence must be corrupted
if (seq.literal_length > IO_istream_len(&litstream)) {
CORRUPTION();
}
u8 *const write_ptr = IO_write_bytes(out, seq.literal_length);
const u8 *const read_ptr =
IO_read_bytes(&litstream, seq.literal_length);
// Copy literals to output
memcpy(write_ptr, read_ptr, seq.literal_length);
total_output += seq.literal_length;
const u32 literals_size = copy_literals(seq, &litstream, out);
total_output += literals_size;
}
size_t offset;
// Offsets are special, we need to handle the repeat offsets
@ -1370,6 +1360,23 @@ static void execute_sequences(frame_context_t *const ctx, ostream_t *const out,
ctx->current_total_output = total_output;
}
static u32 copy_literals(const sequence_command_t seq, istream_t *litstream,
ostream_t *const out) {
// If the sequence asks for more literals than are left, the
// sequence must be corrupted
if (seq.literal_length > IO_istream_len(litstream)) {
CORRUPTION();
}
u8 *const write_ptr = IO_write_bytes(out, seq.literal_length);
const u8 *const read_ptr =
IO_read_bytes(litstream, seq.literal_length);
// Copy literals to output
memcpy(write_ptr, read_ptr, seq.literal_length);
return seq.literal_length;
}
/******* END SEQUENCE EXECUTION ***********************************************/
/******* OUTPUT SIZE COUNTING *************************************************/