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{Portable Network Graphics Delphi ZLIB linking (16 May 2002) }
{This unit links ZLIB to pngimage unit in order to implement }
{the library. It's now using the new ZLIB version, 1.1.4 }
{Note: The .obj files must be located in the subdirectory \obj}
unit pngzlib;
interface
type
TAlloc = function (AppData: Pointer; Items, Size: Integer): Pointer;
TFree = procedure (AppData, Block: Pointer);
// Internal structure. Ignore.
TZStreamRec = packed record
next_in: PChar; // next input byte
avail_in: Integer; // number of bytes available at next_in
total_in: Integer; // total nb of input bytes read so far
next_out: PChar; // next output byte should be put here
avail_out: Integer; // remaining free space at next_out
total_out: Integer; // total nb of bytes output so far
msg: PChar; // last error message, NULL if no error
internal: Pointer; // not visible by applications
zalloc: TAlloc; // used to allocate the internal state
zfree: TFree; // used to free the internal state
AppData: Pointer; // private data object passed to zalloc and zfree
data_type: Integer; // best guess about the data type: ascii or binary
adler: Integer; // adler32 value of the uncompressed data
reserved: Integer; // reserved for future use
end;
function inflateInit_(var strm: TZStreamRec; version: PChar;
recsize: Integer): Integer; forward;
function inflate(var strm: TZStreamRec; flush: Integer): Integer; forward;
function inflateEnd(var strm: TZStreamRec): Integer; forward;
function deflateInit_(var strm: TZStreamRec; level: Integer; version: PChar;
recsize: Integer): Integer; forward;
function deflate(var strm: TZStreamRec; flush: Integer): Integer; forward;
function deflateEnd(var strm: TZStreamRec): Integer; forward;
const
zlib_version = '1.1.4';
function adler32(adler: Integer; buf: PChar; len: Integer): Integer;
const
Z_NO_FLUSH = 0;
Z_PARTIAL_FLUSH = 1;
Z_SYNC_FLUSH = 2;
Z_FULL_FLUSH = 3;
Z_FINISH = 4;
Z_OK = 0;
Z_STREAM_END = 1;
Z_NEED_DICT = 2;
Z_ERRNO = (-1);
Z_STREAM_ERROR = (-2);
Z_DATA_ERROR = (-3);
Z_MEM_ERROR = (-4);
Z_BUF_ERROR = (-5);
Z_VERSION_ERROR = (-6);
Z_NO_COMPRESSION = 0;
Z_BEST_SPEED = 1;
Z_BEST_COMPRESSION = 9;
Z_DEFAULT_COMPRESSION = (-1);
Z_FILTERED = 1;
Z_HUFFMAN_ONLY = 2;
Z_DEFAULT_STRATEGY = 0;
Z_BINARY = 0;
Z_ASCII = 1;
Z_UNKNOWN = 2;
Z_DEFLATED = 8;
_z_errmsg: array[0..9] of PChar = (
'need dictionary', // Z_NEED_DICT (2)
'stream end', // Z_STREAM_END (1)
'', // Z_OK (0)
'file error', // Z_ERRNO (-1)
'stream error', // Z_STREAM_ERROR (-2)
'data error', // Z_DATA_ERROR (-3)
'insufficient memory', // Z_MEM_ERROR (-4)
'buffer error', // Z_BUF_ERROR (-5)
'incompatible version', // Z_VERSION_ERROR (-6)
''
);
implementation
{$L deflate.obj}
{$L trees.obj}
{$L inflate.obj}
{$L inftrees.obj}
{$L adler32.obj}
{$L infblock.obj}
{$L infcodes.obj}
{$L infutil.obj}
{$L inffast.obj}
procedure _tr_init; external;
procedure _tr_tally; external;
procedure _tr_flush_block; external;
procedure _tr_align; external;
procedure _tr_stored_block; external;
function adler32; external;
procedure inflate_blocks_new; external;
procedure inflate_blocks; external;
procedure inflate_blocks_reset; external;
procedure inflate_blocks_free; external;
procedure inflate_set_dictionary; external;
procedure inflate_trees_bits; external;
procedure inflate_trees_dynamic; external;
procedure inflate_trees_fixed; external;
procedure inflate_codes_new; external;
procedure inflate_codes; external;
procedure inflate_codes_free; external;
procedure _inflate_mask; external;
procedure inflate_flush; external;
procedure inflate_fast; external;
procedure _memset(P: Pointer; B: Byte; count: Integer);cdecl;
begin
FillChar(P^, count, B);
end;
procedure _memcpy(dest, source: Pointer; count: Integer);cdecl;
begin
Move(source^, dest^, count);
end;
// deflate compresses data
function deflateInit_(var strm: TZStreamRec; level: Integer; version: PChar;
recsize: Integer): Integer; external;
function deflate(var strm: TZStreamRec; flush: Integer): Integer; external;
function deflateEnd(var strm: TZStreamRec): Integer; external;
// inflate decompresses data
function inflateInit_(var strm: TZStreamRec; version: PChar;
recsize: Integer): Integer; external;
function inflate(var strm: TZStreamRec; flush: Integer): Integer; external;
function inflateEnd(var strm: TZStreamRec): Integer; external;
function inflateReset(var strm: TZStreamRec): Integer; external;
function zcalloc(AppData: Pointer; Items, Size: Integer): Pointer;
begin
GetMem(Result, Items*Size);
end;
procedure zcfree(AppData, Block: Pointer);
begin
FreeMem(Block);
end;
end.
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