aaru-dps/Aaru.Compression.Native
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Add code to compress buffer with LZIP.

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This commit is contained in:
Natalia Portillo
2021-10-21 05:02:25 +01:00
parent 1cfa178431
commit ae6d003aef
2 changed files with 69 additions and 0 deletions
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63
lzip.c
View File

@@ -80,5 +80,68 @@ AARU_EXPORT int32_t AARU_CALL lzip_decode_buffer(uint8_t* dst_buffer,
// Free buffers
LZ_decompress_close(ctx);
return out_pos;
}
AARU_EXPORT int32_t AARU_CALL lzip_encode_buffer(uint8_t* dst_buffer,
int32_t dst_size,
const uint8_t* src_buffer,
int32_t src_size,
int32_t dictionary_size,
int32_t match_len_limit)
{
int max_in_size;
void* ctx;
enum LZ_Errno lz_err;
int32_t in_pos = 0, out_pos = 0, in_size;
int rd;
// Initialize the decoder
ctx = LZ_compress_open(dictionary_size, match_len_limit, src_size);
lz_err = LZ_compress_errno(ctx);
if(lz_err != LZ_ok)
{
// Ensure freed
LZ_compress_close(ctx);
return 0;
}
// Check maximum lzip buffer input size
max_in_size = LZ_compress_write_size(ctx);
if(src_size < max_in_size) max_in_size = src_size;
// Compress buffer
while(in_pos < src_size && out_pos < dst_size)
{
if(src_size - in_pos < max_in_size) max_in_size = src_size - in_pos;
in_size = LZ_compress_write(ctx, src_buffer + in_pos, max_in_size);
in_pos += in_size;
rd = LZ_compress_read(ctx, dst_buffer + out_pos, dst_size);
out_pos += rd;
if(LZ_compress_finished(ctx) == 1) break;
}
LZ_compress_finish(ctx);
if(out_pos < dst_size)
{
do {
rd = LZ_compress_read(ctx, dst_buffer + out_pos, dst_size);
out_pos += rd;
if(LZ_compress_finished(ctx) == 1) break;
} while(rd > 0 && out_pos < dst_size);
}
// Free buffers
LZ_compress_close(ctx);
return out_pos;
}

6
lzip.h
View File

@@ -24,4 +24,10 @@ AARU_EXPORT int32_t AARU_CALL lzip_decode_buffer(uint8_t* dst_buffer,
const uint8_t* src_buffer,
int32_t src_size);
AARU_EXPORT int32_t AARU_CALL lzip_encode_buffer(uint8_t* dst_buffer,
int32_t dst_size,
const uint8_t* src_buffer,
int32_t src_size,
int32_t dictionary_size,
int32_t match_len_limit);
#endif // AARU_CHECKSUMS_NATIVE__LZIP_H_