This unit allows you to easily compress and decompress buffers and strings like in PHP. Main goal of this unit is to be as small as possible.
- compiled demo is ~80 kB in size
- adding unit to uses section increases binary size by ~45 kB, even less if you already use zlib units for other things
| Compression |
Decompression |
| Function | Format | Status |
|---|
| gzdeflate() | DEFLATE | ✔ | | gzcompress() | ZLIB | ✔ | | gzencode() | GZIP | ✔ |
|
| Function | Format | Status |
|---|
| gzinflate() | DEFLATE | ✔ | | gzuncompress() | ZLIB | ✔ | | gzdecode() | GZIP | ✔ | | zdecompress() | ANY | ✔ |
|
compressed := gzencode('some string');
decompressed := gzdecode(compressed);Use zdecompress() to auto detect stream type and decompress:
compressed := gzencode('some string');
decompressed := zdecompress(compressed);//compress whole buffer to DEFLATE at once
function gzdeflate(data: pointer; size: dword; var output: pointer; var outputsize: dword; level: dword=9): boolean;
//compress whole string to DEFLATE at once
function gzdeflate(str: string; level: dword=9): string;
//compress whole bytes to DEFLATE at once
function gzdeflate(bytes: TBytes; level: dword=9): TBytes;
//decompress whole DEFLATE buffer at once
function gzinflate(data: pointer; size: dword; var output: pointer; var outputsize: dword): boolean;
//decompress whole DEFLATE string at once
function gzinflate(str: string): string;
//decompress whole DEFLATE bytes at once
function gzinflate(bytes: TBytes): TBytes;
//compress whole buffer to ZLIB at once
function gzcompress(data: pointer; size: dword; var output: pointer; var outputsize: dword; level: dword=9): boolean;
//compress whole string to ZLIB at once
function gzcompress(str: string; level: dword=9): string;
//compress whole buffer to ZLIB at once
function gzcompress(bytes: TBytes; level: dword=9): TBytes;
//decompress whole ZLIB buffer at once
function gzuncompress(data: pointer; size: dword; var output: pointer; var outputsize: dword): boolean;
//decompress whole ZLIB string at once
function gzuncompress(str: string): string;
//decompress whole ZLIB buffer at once
function gzuncompress(bytes: TBytes): TBytes;
//compress whole buffer to GZIP at once
function gzencode(data: pointer; size: dword; var output: pointer; var outputsize: dword; level: dword=9; filename: string=''; comment: string=''): boolean;
//compress whole string to GZIP at once
function gzencode(str: string; level: dword=9; filename: string=''; comment: string=''): string;
//compress whole string to GZIP at once
function gzencode(bytes: TBytes; level: dword=9; filename: string=''; comment: string=''): TBytes;
//decompress whole GZIP buffer at once
function gzdecode(data: pointer; size: dword; var output: pointer; var outputsize: dword): boolean;
//decompress whole GZIP string at once
function gzdecode(str: string): string;
//decompress whole GZIP string at once
function gzdecode(bytes: TBytes): TBytes;
//try to detect buffer format and decompress it at once
function zdecompress(data: pointer; size: dword; var output: pointer; var outputsize: dword): boolean;
//try to detect string format and decompress it at once
function zdecompress(str: string): string;
//try to detect bytes format and decompress it at once
function zdecompress(bytes: TBytes): TBytes;
Additional unit to handle bigger files. Read & write & compress/decompress by chunks.
| Compression |
Decompression |
| Function | Format | Status |
|---|
| gzdeflate_file() | DEFLATE | ❌ | | gzcompress_file() | ZLIB | ❌ | | gzencode_file() | GZIP | ✔ |
|
| Function | Format | Status |
|---|
| gzinflate_file() | DEFLATE | ❌ | | gzuncompress_file() | ZLIB | ❌ | | gzdecode_file() | GZIP | ✔ |
|
//compress a file to GZIP
function gzencode_file(src, dst: string; level: dword=9; filename: string=''; comment: string=''; progresscb: tzprogresscb=nil; resolution: dword=100): boolean;
//decompress a GZIP file
function gzdecode_file(src, dst: string; progresscb: tzprogresscb=nil; resolution: dword=100): boolean;
A callback may be provided to these functions. Callback function may abort ongoing operation by returning false.
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