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author | tobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c> | 2008-06-14 18:24:43 +0000 |
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committer | tobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c> | 2008-06-14 18:24:43 +0000 |
commit | 68b29a08bc21b15b923b3430fbc41baedba73883 (patch) | |
tree | 23005644b6e4ec95914fd9e51c23735715f1ec5f /Game/Code/lib/ffmpeg/avio.pas | |
parent | bcec80f4bc1a7b299f37b49d463494d6817f4496 (diff) | |
download | usdx-68b29a08bc21b15b923b3430fbc41baedba73883.tar.gz usdx-68b29a08bc21b15b923b3430fbc41baedba73883.tar.xz usdx-68b29a08bc21b15b923b3430fbc41baedba73883.zip |
Removed some "const" parameter modifiers for external function declarations. Pascal has no equivalent to C's "pointer to constant type" const modifier. E.g. "const char* cstr" is not equivalent to "const cstr: PChar". This is because the first is a variable pointer to a constant type and the latter is a constant pointer to a variable type. This means contrary to the C version, in the incorrect pascal version the string can be changed. So it is like a false friend in this example, although "cstr: PChar" is not correct either, as the string can be changed too.
Also note that "var myvar: TMyType" is always passed as reference (a pointer is used for this, so it is equivalent to "myvar: PMyType"). This also normally applies to "const myvar: TMyType". But not if the type-size is < 4byte or the function is declared as stdcall or cdecl. In these cases the variable is passed on the stack and not as a pointer. So NEVER replace a C declaration "const my_type_t* my_var" with "const my_var: TMy_type" as it might fail. Use the var modifier instead.
git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/trunk@1148 b956fd51-792f-4845-bead-9b4dfca2ff2c
Diffstat (limited to 'Game/Code/lib/ffmpeg/avio.pas')
-rw-r--r-- | Game/Code/lib/ffmpeg/avio.pas | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/Game/Code/lib/ffmpeg/avio.pas b/Game/Code/lib/ffmpeg/avio.pas index 745725b7..4a7d3a3b 100644 --- a/Game/Code/lib/ffmpeg/avio.pas +++ b/Game/Code/lib/ffmpeg/avio.pas @@ -101,7 +101,7 @@ type TURLProtocol = record name: pchar; - url_open: function (h: PURLContext; {const} filename: pchar; flags: integer): integer; cdecl; + url_open: function (h: PURLContext; filename: {const} pchar; flags: integer): integer; cdecl; url_read: function (h: PURLContext; buf: pchar; size: integer): integer; cdecl; url_write: function (h: PURLContext; buf: pchar; size: integer): integer; cdecl; url_seek: function (h: PURLContext; pos: TOffset; whence: integer): TOffset; cdecl; @@ -145,7 +145,7 @@ type max_packet_size: integer; checksum: longword; checksum_ptr: pchar; - update_checksum: function (checksum: Longword; {const} buf: pchar; size: cardinal): Longword; cdecl; + update_checksum: function (checksum: Longword; buf: {const} pchar; size: cardinal): Longword; cdecl; error: integer; ///< contains the error code or 0 if no error happened {$IF (LIBAVFORMAT_VERSION >= 52001000) and (LIBAVFORMAT_VERSION < 52004000)} // 52.1.0 .. 52.4.0 read_play: function(opaque: Pointer): integer; cdecl; @@ -160,7 +160,7 @@ type {$IFEND} end; -function url_open(h: PPointer; {const} filename: pchar; flags: integer): integer; +function url_open(h: PPointer; filename: {const} pchar; flags: integer): integer; cdecl; external av__format; function url_read (h: PURLContext; buf: pchar; size: integer): integer; cdecl; external av__format; @@ -170,7 +170,7 @@ function url_seek (h: PURLContext; pos: TOffset; whence: integer): TOffset; cdecl; external av__format; function url_close (h: PURLContext): integer; cdecl; external av__format; -function url_exist(const filename: pchar): integer; +function url_exist(filename: {const} pchar): integer; cdecl; external av__format; function url_filesize (h: PURLContext): TOffset; cdecl; external av__format; @@ -274,7 +274,7 @@ function av_alloc_put_byte( procedure put_byte(s: PByteIOContext; b: integer); cdecl; external av__format; -procedure put_buffer (s: PByteIOContext; {const} buf: pchar; size: integer); +procedure put_buffer (s: PByteIOContext; buf: {const} pchar; size: integer); cdecl; external av__format; procedure put_le64(s: PByteIOContext; val: int64); cdecl; external av__format; @@ -292,10 +292,10 @@ procedure put_le16(s: PByteIOContext; val: cardinal); cdecl; external av__format; procedure put_be16(s: PByteIOContext; val: cardinal); cdecl; external av__format; -procedure put_tag(s: PByteIOContext; {const} tag: pchar); +procedure put_tag(s: PByteIOContext; tag: {const} pchar); cdecl; external av__format; -procedure put_strz(s: PByteIOContext; {const} buf: pchar); +procedure put_strz(s: PByteIOContext; buf: {const} pchar); cdecl; external av__format; (** @@ -353,7 +353,7 @@ function url_fgetc(s: PByteIOContext): integer; cdecl; external av__format; (** @warning currently size is limited *) -function url_fprintf(s: PByteIOContext; {const} fmt: PChar; args: array of const): integer; +function url_fprintf(s: PByteIOContext; fmt: {const} PChar; args: array of const): integer; cdecl; external av__format; (** @note unlike fgets, the EOL character is not returned and a whole @@ -437,9 +437,9 @@ function url_resetbuf(s: PByteIOContext; flags: integer): integer; (** @note when opened as read/write, the buffers are only used for writing *) {$IF LIBAVFORMAT_VERSION >= 52000000} // 52.0.0 -function url_fopen(var s: PByteIOContext; const filename: pchar; flags: integer): integer; +function url_fopen(var s: PByteIOContext; filename: {const} pchar; flags: integer): integer; {$ELSE} -function url_fopen(s: PByteIOContext; const filename: pchar; flags: integer): integer; +function url_fopen(s: PByteIOContext; filename: {const} pchar; flags: integer): integer; {$IFEND} cdecl; external av__format; function url_fclose(s: PByteIOContext): integer; @@ -509,7 +509,7 @@ function url_close_dyn_buf(s: PByteIOContext; pbuffer:PPointer): integer; cdecl; external av__format; {$IF LIBAVFORMAT_VERSION >= 51017001} // 51.17.1 -function ff_crc04C11DB7_update(checksum: longword; {const} buf: PChar; len: cardinal): longword; +function ff_crc04C11DB7_update(checksum: longword; buf: {const} PChar; len: cardinal): longword; cdecl; external av__format; {$IFEND} function get_checksum(s: PByteIOContext): cardinal; @@ -518,7 +518,7 @@ procedure init_checksum (s: PByteIOContext; update_checksum: pointer; checksum: cdecl; external av__format; (* udp.c *) -function udp_set_remote_url(h: PURLContext; {const} uri: pchar): integer; +function udp_set_remote_url(h: PURLContext; uri: {const} pchar): integer; cdecl; external av__format; function udp_get_local_port(h: PURLContext): integer; cdecl; external av__format; |