Branch: Tag:

2014-08-28

2014-08-28 12:03:12 by Per Hedbor <ph@opera.com>

Moved __builtin.IOBuffer to Stdio.IOBuffer (for now)

1: + #include "global.h" + #include "object.h" + #include "interpret.h" + #include "operators.h" + #include "bignum.h" + #include "sscanf.h" + #include "builtin_functions.h" + #include "port.h" + #include "whitespace.h" + #include "pike_types.h" + #include "iobuffer.h" + #include <arpa/inet.h>    -  + #define DEFAULT_CMOD_STORAGE static + DECLARATIONS +  + /*! @class IOBuffer +  *! +  *! A buffer to use as input or buffering when doing I/O. It is +  *! similar to @[String.Buffer], but can only contain 8bit data and is +  *! designed for protocol parsing. It is optimized for reading from +  *! the beginning and adding to the end, and will try to minimize the +  *! amount of data copying that is done. +  *! +  *! It can also directly read from and write to filedescriptors if so +  *! desired. This eliminates at least one memory copy. +  */ + PIKECLASS IOBuffer + { +  CVAR IOBuffer b; +  +  static void io_set_error_mode( IOBuffer *io, int m ) +  { +  io->error_mode = m; +  } +  +  static size_t io_len( IOBuffer *io ) +  { +  return io->len-io->offset; +  } +  +  static void io_unlock( IOBuffer *io ) +  { +  io->locked--; +  } +  +  static void io_lock( IOBuffer *io ) +  { +  io->locked++; +  } +  +  static void io_ensure_unlocked(IOBuffer *io) +  { +  if( io->locked ) +  Pike_error("Can not modify the buffer right now, " +  " there are active subbuffers.\n"); +  } +  +  static INT_TYPE io_consume( IOBuffer *io, int num ) +  { +  io->offset += num; +  return io_len(io); +  } +  +  static unsigned char *io_read_pointer(IOBuffer *io) +  { +  return io->buffer + io->offset; +  } +  +  static unsigned char *io_add_space( IOBuffer *io, int bytes, int force ) +  { +  io_ensure_unlocked(io); +  if( !io->malloced ) +  { +  /* convert to malloced buffer from a shared one. */ +  unsigned char *old = io->buffer; +  io->buffer = xalloc( io->len + bytes + 100 ); +  io->allocated = io->len + bytes + 100; +  memcpy( io->buffer, old, io->len ); +  if( io->sub ) { +  io_unlock( get_storage(io->sub,IOBuffer_program ) ); +  free_object( io->sub ); +  } +  if( io->str ) free_string( io->str ); +  io->sub = 0; +  io->str = 0; +  io->malloced = 1; +  } +  +  if( force || (io->offset > io->len>>1) ) /* more than half used up. */ +  { +  memmove( io->buffer, io->buffer+io->offset, io->len-io->offset ); +  io->len -= io->offset; +  io->offset = 0; +  } +  if( io->len + bytes > io->allocated ) +  { +  size_t new_len = io->allocated; +  do +  new_len = ((new_len+32)*2)-32; +  while( new_len < io->len + bytes ); +  io->buffer = xrealloc( io->buffer, new_len ); +  io->allocated = new_len; +  } +  return io->buffer+io->len; +  } +  +  static void io_range_error( IOBuffer *io, int howmuch ) +  { +  /* throw error if so desired. */ +  if( io->error_mode ) +  Pike_error("Trying to read %d outside allowed range\n", howmuch); +  } +  +  static int io_avail( IOBuffer *io, int len ) +  { +  if( len < 0 || len + io->offset > io->len ) +  { +  io_range_error( io, len ); +  return 0; +  } +  return 1; +  } +  +  static size_t io_append( IOBuffer *io, void *p, int bytes ) +  { +  memcpy( io_add_space( io, bytes, 0 ), p, bytes ); +  io->len += bytes; +  return io_len(io); +  } +  +  static size_t io_read( IOBuffer *io, void *to, size_t len ) +  { +  if( !io_avail(io,len)) +  return 0; +  memcpy( to, io_read_pointer(io), len ); +  io_consume( io, len ); +  return len; +  } +  +  static struct pike_string *io_read_string( IOBuffer *io, size_t len ) +  { +  struct pike_string *s; +  if( !io_avail(io,len)) +  return NULL; +  +  if( len > 0x7fffffff ) +  Pike_error("This region is too large to convert to a string.\n"); +  s = begin_shared_string( len ); +  io_read( io, s->str, s->len ); +  return end_shared_string(s); +  } +  +  static struct object *io_read_buffer( IOBuffer *io, size_t len, int do_copy ) +  { +  struct object *b; +  IOBuffer *to; +  if( !io_avail(io,len)) +  return NULL; +  +  b = low_clone( IOBuffer_program ); +  to = get_storage(b,IOBuffer_program); +  +  io_lock( io ); +  +  to->buffer = io_read_pointer(io); +  to->len = len; +  to->sub = Pike_fp->current_object; +  to->sub->refs++; +  io_consume( io, len ); +  +  if( do_copy ) +  io_add_space( to, 0, 0 );/* copies data. */ +  +  return b; +  } +  +  static int io_read_byte_uc( IOBuffer *io ) +  { +  return io->buffer[io->offset++]; +  } +  + #if 0 +  static int io_read_byte( IOBuffer *io ) +  { +  if( !io_avail(io,1)) +  return -1; +  return io_read_byte_uc( io ); +  } + #endif +  +  static LONGEST io_read_number( IOBuffer *io, size_t len ) +  { +  size_t i; +  LONGEST res; +  if( !io_avail(io, len) ) +  return -1; +  if( len > SIZEOF_INT_TYPE ) +  { +  unsigned int extra = len-SIZEOF_INT_TYPE; +  /* ensure only 0:s */ +  for( i=0; i<extra; i++ ) +  { +  if( io_read_byte_uc(io) ) +  Pike_error("Integer (%dbit) overflow.\n", SIZEOF_INT_TYPE*8); +  } +  len=SIZEOF_INT_TYPE; +  } +  if( len == SIZEOF_INT_TYPE ) +  { +  res = io_read_byte_uc(io); +  if( res > 127 ) +  Pike_error("Signed (%dbit) overflow.\n", SIZEOF_INT_TYPE*8); +  len--; +  } +  else +  res = 0; +  for( i=0; i<len; i++ ) +  { +  res <<= 8; +  res |= io_read_byte_uc(io); +  } +  return res; +  } +  +  static struct object *io_read_bignum( IOBuffer *io, size_t len ) +  { +  int i; +  struct pike_string *num; +  LONGEST res; +  num = io_read_string( io, len ); +  if( !num ) return NULL; +  push_string( num ); +  push_int( 256 ); +  return clone_object( get_auto_bignum_program(), 2 ); +  } +  +  static size_t io_add_int( IOBuffer *io, INT_TYPE i, size_t bytes ) +  { +  unsigned char *x = io_add_space(io, bytes, 0); +  io->len += bytes; +  while(bytes--) +  { +  x[bytes] = i&255; +  i>>=8; +  } +  return io_len( io ); +  } +  +  static size_t io_rewind( IOBuffer *io, INT_TYPE n ) +  { +  if( n < 0 || (io->offset < (unsigned)n) ) +  { +  io_range_error(io,-n); +  return -1; +  } +  io->offset -= n; +  return io->offset; +  } +  +  /* pike functions */ +  + #undef THIS + #define THIS (&(((struct IOBuffer_struct *)Pike_fp->current_storage)->b)) +  +  PIKEFUN int _size_object( ) +  { +  RETURN THIS->malloced ? THIS->allocated : 0; +  } +  + /* PIKEFUN void add( object(String.IOBuffer) x[, int len[,int start]] )*/ + /* PIKEFUN void add( object(String.Buffer) x[, int len[,int start]] ) */ + /* PIKEFUN void add( System.Memory x[, int len[,int start]] ) */ +  +  +  /*! @decl void add( string(8bit)|int(8bit) ... data ) +  *! +  *! Add the items in data one at a time. +  *! Integers are assumed to be 8bit numbers (characters) +  */ +  PIKEFUN int add( string|int ... argp) +  { +  int i; +  IOBuffer *io = THIS; +  for(i=0; i<args; i++ ) +  { +  if( TYPEOF(argp[i]) == PIKE_T_STRING ) +  { +  struct pike_string *s = argp[i].u.string; +  if( s->size_shift ) Pike_error("IOBuffer only handles 8bit data\n"); +  io_append( io, s->str, s->len ); +  } +  else +  { +  unsigned char a = argp[i].u.integer & 255; +  io_append( io, &a, 1 ); +  } +  } +  RETURN io_len(io); +  } +  +  /*! @decl int add_byte( int(0..255) ) +  *! @decl int add_int8( int(0..255) ) +  *! Adds a single byte to the buffer. +  */ +  PIKEFUN int add_byte( int(0..255) i ) +  { +  unsigned char a = i&255; +  RETURN io_append( THIS, &a, 1 ); +  } +  +  PIKEFUN int add_int8( int(0..255) i ) +  { +  unsigned char a = i&255; +  RETURN io_append( THIS, &a, 1 ); +  } +  +  /*! @decl int add_int16( int(0..65535) ) +  *! @decl int add_short( int(0..65535) ) +  *! +  *! Add a 16-bit network byte order value to the buffer +  */ +  PIKEFUN int add_int16( int(0..65535) i ) +  { +  unsigned short a = htons((i&65535)); +  push_int(io_append( THIS, &a, 2 )); +  } +  +  PIKEFUN int add_short( int(0..65535) i ) +  { +  unsigned short a = htons((i&65535)); +  RETURN io_append( THIS, &a, 2 ); +  } +  +  /*! @decl int add_int32( int i ) +  *! Adds a 32 bit network byte order value to the buffer +  */ +  PIKEFUN int add_int32( int i ) +  { +  INT32 a = htonl(i); +  push_int(io_append( THIS, &a, 4 )); +  } +  +  /*! @decl void add_hstring( string(0..255) data, int size_size ) +  *! +  *! Adds length/data for @[data] to the buffer. +  *! +  *! This is identical to @[sprintf("%"+size_size+"H",data)] but +  *! significantly faster. +  *! +  *! @[size_size] must be less than Int.NATIVE_MAX. +  */ +  PIKEFUN int add_hstring( string str, int size_size ) +  { +  if( str->size_shift ) +  Pike_error("Only 8bit is supported\n"); +  +  /* We know this is safe for len>=4, since pike strings are at +  * most 0x7ffffff bytes long. +  */ +  if( size_size < 4 && +  str->len > (1<<(8*(size_size<0?-size_size:size_size)))-1 ) +  Pike_error("Too long string\n"); +  +  io_add_int( THIS, str->len, size_size ); +  push_int(io_append( THIS, str->str, str->len )); +  } +  +  /*! @decl int add_int( int i, int(0..) width ) +  *! +  *! Adds a generic integer to the buffer as an (width*8)bit +  *! network byteorder number. +  *! +  *! @[width] must be less than Int.NATIVE_MAX. +  *! +  */ +  PIKEFUN int add_int( int i, int width ) +  { +  RETURN io_add_int( THIS, i, width ); +  } +  +  PIKEFUN int add_int( object o, int width ) +  { +  char *p; +  int extra, len; +  pop_stack(); +  convert_stack_top_to_bignum(); +  /* we now know for sure it's a bignum. */ +  push_int(256); +  apply( Pike_sp[-2].u.object, "digits", 1 ); +  p = Pike_sp[-1].u.string->str; +  len = Pike_sp[-1].u.string->len; +  if( len > width ) +  Pike_error("Number too large to store in %d bits\n", width*8); +  /* p += len-width;*/ +  +  if( len < width ) +  { +  INT_TYPE null = 0; +  +  while( len < width ) +  { +  int a = MIN(width-len,sizeof(INT_TYPE)); +  io_append( THIS, &null, a ); +  width-=a; +  } +  } +  RETURN io_append( THIS, p, width ); +  } +  +  /*! @decl protected int `[](int off) +  *! +  *! Return the character at the specified offset. +  */ +  PIKEFUN int `[]( int off ) +  flags ID_PROTECTED; +  { +  IOBuffer *io = THIS; +  pop_stack(); +  if( off < 0 ) +  off = io_len(io)-off; +  +  if( io_avail( io, off ) ) +  push_int( io_read_pointer(io)[off] ); +  else +  push_int(-1); +  } +  +  /*! @decl protected int `[]=(int off, int char) +  *! +  *! Set the character at the specified offset to @[char]. +  */ +  PIKEFUN int `[]=( int off, int val ) +  flags ID_PROTECTED; +  { +  IOBuffer *io = THIS; +  io_add_space( io, 0, 0 ); +  +  if( off < 0 ) off = io_len(io)-off; +  +  if( io_avail( io, off ) ) +  { +  io_read_pointer(io)[off]=(val&0xff); +  } +  else +  { +  /* hm, well. We could extend the buffer? */ +  push_int(-1); +  } +  } +  +  +  /*! @decl int _sizeof() +  *! +  *! Returns the buffer size, in bytes. +  *! This is how much you can read from the buffer until it runs out of data. +  */ +  PIKEFUN int _sizeof() +  flags ID_PROTECTED; +  { +  push_int64(io_len(THIS)); +  } +  +  /*! @decl string cast(string type) +  *! +  *! Convert the buffer to a string. +  *! +  *!@note +  *! This only works for buffers whose length is less than 0x7fffffff. +  */ +  PIKEFUN string cast(string to) +  { +  if( to != literal_string_string ) +  { +  push_undefined(); +  return; +  } +  if( io_len(THIS) > 0x7fffffff ) +  Pike_error("This buffer is too large to convert to a string.\n"); +  push_string(make_shared_binary_string((void*)io_read_pointer(THIS), +  (INT32)io_len(THIS))); +  } +  +  +  /*! @decl void set_error_mode(int m) +  *! +  *! Set the error mode of this buffer to @[m]. +  *! +  *! If true operations that would normally return 0 (like trying to read too much) +  *! will instead thrown an error. +  *! +  *! This is useful when parsing received data, you do not have to +  *! verify that each and every read operation suceeds. +  *! +  *! However, the non-error mode is more useful when checking to see +  *! if a packet/segment/whatever has arrived. +  *! +  *! The thrown error object will have the constant buffer_error set +  *! to a non-false value. +  *! +  *! @example +  *! @code +  *! void read_callback(int i, string new_data) +  *! { +  *! inbuffer->add( new_data ); +  *! +  *! while( IOBuffer packet = inbuffer->read_hbuffer(2) ) +  *! { +  *! packet->set_error_mode(Buffer.THROW_ERROR); +  *! if( mixed e = catch( handle_packet( packet ) ) ) +  *! if( e->buffer_error ) +  *! protocol_error(); // illegal data in packet +  *! else +  *! throw(e); // the other code did something bad +  *! } +  *! } +  *! +  *! +  *! void handle_packet( IOBuffer pack ) +  *! { +  *! switch( pack->read_int8() ) +  *! { +  *! ... +  *! case HEADER_FRAME: +  *! int num_headers = pack->read_int32(); +  *! for( int i = 0; i<num_headers; i++ ) +  *! headers[pack->read_hstring(2)] = pack->read_hstring(2); +  *! ... +  *! } +  *! } +  *! @endcode +  */ +  PIKEFUN void set_error_mode( int m ) +  { +  io_set_error_mode( THIS, m ); +  pop_stack(); +  } +  +  /*! @decl object lock() +  *! +  *! Makes this buffer read only until the returned object is released. +  *! +  *! @note +  *! This currently simply returns a 0-length subbuffer. +  */ +  PIKEFUN IOBuffer lock() +  { +  push_object( io_read_buffer( THIS, 0, 0 ) ); +  } +  +  PIKEFUN string _sprintf(int o, mapping ignore) +  flags ID_PROTECTED; +  { +  pop_n_elems(args); +  if( o == 'O' ) +  { +  push_text("IOBuffer(%d bytes, read=[..%d] data=[%d..%d] free=[%d..%d] %s%s)"); +  /* io_len [..offset] [offset..len] [..allocated] */ +  push_int(io_len(THIS)); +  push_int(THIS->offset-1); +  push_int(THIS->offset); +  push_int(THIS->len-1); +  push_int(THIS->len); +  push_int(THIS->allocated); +  push_text( (THIS->str ? "string" : THIS->sub ? "subbuffer" : "allocated" ) ); +  if( THIS->locked ) +  push_text(" (read only)"); +  else +  push_text(""); +  f_sprintf(9); +  } +  else +  push_undefined(); +  } +  +  /*! @decl string(8bit) read_hstring( int(0..) n ) +  *! +  *! Identical in functionality to @[read](@[read_number](@[n])) but +  *! faster. +  *! +  *! Read a network byte order number of size n*8 bits, then return the +  *! indicated number of bytes as a string. +  *! +  *! If there is not enough data available return 0. +  *! +  *! Note that pike string can not be longer than 0x7fffffff bytes (~2Gb). +  */ +  PIKEFUN string(0..255) read_hstring( int(0..) bytes ) +  { +  LONGEST len; +  struct pike_string *s; +  +  len = io_read_number( THIS, bytes ); +  s = io_read_string( THIS, len ); +  if( s ) +  push_string(s); +  else +  push_int(0); +  } +  +  /*! @decl IOBuffer read_hbuffer( int n ) +  *! @decl IOBuffer read_hbuffer( int n, bool copy ) +  *! +  *! Same as @[read_hstring], but returns the result as an IOBuffer. +  *! +  *! No data is copied unless @[copy] is specified and true, the new +  *! buffer points into the old one. +  *! +  *! @note +  *! As long as the subbuffer exists no data can be added to the +  *! main buffer. +  *! +  *! Usually this is OK, since it often represents something that +  *! should be parsed before the next whatever is extracted from +  *! the buffer, but do take care. +  *! +  *! If you need to unlink the new buffer after it has been +  *! created, call @[trim] in it. +  */ +  PIKEFUN IOBuffer read_hbuffer( int(0..) bytes, int|void copy ) +  { +  LONGEST len = io_read_number( THIS, bytes ); +  int do_copy = 0; +  struct object *o; +  if( copy ) do_copy = copy->u.integer; +  pop_n_elems(args); +  +  if( (o = io_read_buffer( THIS, len, do_copy )) ) +  push_object(o); +  else +  push_int(0); +  } +  +  /*! @decl IOBuffer read_buffer( int n ) +  *! @decl IOBuffer read_buffer( int n, bool copy ) +  *! +  *! Same as @[read], but returns the result as an IOBuffer. +  *! +  *! No data is copied unless @[copy] is specified and true, the new buffer +  *! points into the old one. +  *! +  *! @note +  *! As long as the subbuffer exists no data can be added to the main buffer. +  *! +  *! Usually this is OK, since it often represents something that +  *! should be parsed before the next whatever is extracted from +  *! the buffer, but do take care. +  */ +  PIKEFUN IOBuffer read_buffer( int bytes, int|void copy ) +  { +  int do_copy = 0; +  struct object *o; +  if( copy ) +  do_copy = copy->u.integer; +  pop_n_elems(args); +  if( (o = io_read_buffer( THIS, bytes, do_copy )) ) +  push_object(o); +  else +  push_int(0); +  } +  +  /*! @decl int sprintf(strict_sprintf_format format, sprintf_args ... args) +  *! +  *! Appends the output from @[sprintf] at the end of the buffer. +  *! +  *! This is somewhat faster than add(sprintf(...)) since no +  *! intermediate string is created. +  */ +  PIKEFUN int sprintf(mixed ... ignored) +  rawtype tFuncV(tAttr("strict_sprintf_format", tOr(tStr, tObj)), +  tAttr("sprintf_args", tMix), tStr); +  { +  ONERROR _e; +  struct string_builder tmp; +  INT_TYPE sz; +  init_string_builder(&tmp,0); +  SET_ONERROR(_e, free_string_builder, &tmp); +  low_f_sprintf(args, 0, &tmp ); +  if( tmp.s->size_shift ) +  Pike_error("IOBuffer only handles 8bit data\n"); +  sz = io_append( THIS, tmp.s->str, tmp.s->len ); +  pop_n_elems(args); +  CALL_AND_UNSET_ONERROR(_e); +  push_int(sz); +  } +  +  /*! @decl array sscanf(string(8bit) format) +  *! +  *! Reads data from the beginning of the buffer to match the +  *! specifed format, then return an array with the matches. +  *! +  *! The non-matching data will be left in the buffer. +  *! +  *! See @[array_sscanf] for more information. +  */ +  PIKEFUN array sscanf( string format ) +  { +  INT32 i; +  ptrdiff_t num_used; +  struct svalue *start = Pike_sp; +  +  i = low_sscanf_pcharp( +  MKPCHARP(io_read_pointer(THIS), 0), io_len(THIS), +  MKPCHARP(format->str,format->size_shift), format->len, +  &num_used, 0); +  +  if( !num_used ) +  { +  io_range_error(THIS,-1); +  pop_n_elems(Pike_sp-start); +  push_int(0); +  } +  else +  { +  io_consume( THIS, num_used ); +  f_aggregate(Pike_sp-start); +  } +  } +  +  +  /*! @decl mixed match(string(8bit) format) +  *! +  *! Reads data from the beginning of the buffer to match the +  *! specifed format, then return the match. +  *! +  *! The non-matching data will be left in the buffer. +  *! +  *! This function is very similar to @[sscanf], but the +  *! result is the sum of the matches. Most useful to match +  *! a single value. +  *! +  *! @example +  *! @code +  *! // get the next whitespace separated word from the buffer. +  *! buffer->match("%*[ \t\r\n]%*[^ \t\r\n]"); +  *! @endcode +  */ +  PIKEFUN string|int|float|array match( string format ) +  { +  INT32 i; +  ptrdiff_t num_used; +  struct svalue *start = Pike_sp; +  +  i = low_sscanf_pcharp( +  MKPCHARP(io_read_pointer(THIS), 0), io_len(THIS), +  MKPCHARP(format->str,format->size_shift), format->len, +  &num_used, +  0); +  +  if( !num_used ) +  { +  io_range_error(THIS,-1); +  pop_n_elems(Pike_sp-start); +  push_int(0); +  } +  else +  { +  io_consume( THIS, num_used ); +  if( Pike_sp-start > 1 ) +  f_add(Pike_sp-start); +  } +  } +  +  +  /*! @decl void clear() +  *! +  *! Clear the buffer. +  */ +  PIKEFUN void clear( ) +  { +  IOBuffer *io = THIS; +  io->offset = io->len = 0; +  } +  +  /*! @decl void trim() +  *! +  *! Frees unused memory. +  *! +  *! Note that calling this function excessively will slow things +  *! down, since the data often has to be copied. +  *! +  *! @note +  *! This function could possibly throw an out-of-memory error +  *! if the realloc fails to find a new (smaller) memory area. +  */ +  PIKEFUN void trim( ) +  { +  IOBuffer *io = THIS; +  io_add_space( io, 0, 1 ); +  if( io->allocated > io->len+32 ) +  { +  io->buffer = xrealloc( io->buffer, io->len ); +  io->allocated = io->len; +  } +  } +  +  /*! @decl int(0..)|int(-1..-1) consume( int(0..) n ) +  *! +  *! Discard the first @[n] bytes from the buffer +  */ +  PIKEFUN int(-1..) consume( int n ) +  { +  if( !io_avail( THIS, n ) ) +  { +  io_range_error( THIS, n ); +  push_int(-1); +  } +  else +  push_int64( io_consume( THIS, n ) ); +  } +  +  +  /*! @decl int(0..)|int(-1..-1) unread( int(0..) n ) +  *! +  *! Rewind the buffer @[n] bytes. +  *! +  *! @returns +  *! +  *! This function returns how many more bytes of buffer is +  *! available to rewind, or -1 on error. +  *! +  *! @note +  *! +  *! Unless you add new data to the buffer using any of the add +  *! functions you can always rewind. +  *! +  *! You can call @[undread(0)] to see how much. +  */ +  PIKEFUN int(-1..) unread( int(0..) bytes ) +  { +  push_int64( io_rewind( THIS, bytes ) ); +  } +  +  /*! @decl string(8bit) read( int n ) +  *! +  *! Read @[bytes] bytes of data from the buffer. +  *! +  *! If there is not enough data available this returns 0. +  */ +  PIKEFUN string(0..255) read( int(0..) bytes ) +  { +  struct pike_string * s = io_read_string(THIS, bytes ); +  pop_stack(); +  if( s ) +  push_string(s); +  else +  push_int(0); +  } +  +  /*! @decl string(8bit) read( ) +  *! +  *! Read all data from the buffer. +  *! +  *! If there is not enough data available this returns 0. +  *! +  *! This is basically equivalent to (string)buffer, but it also +  *! removes the data from the buffer. +  */ +  PIKEFUN string(0..255) read() +  { +  struct pike_string * s = io_read_string(THIS, io_len(THIS)); +  if( !s ) +  push_int(0); +  else +  push_string(s); +  } +  +  /*! @decl read_int( int n ) +  *! +  *! Read a network (if n is positive) or little endian (if n is +  *! negative) byte order unsigned number of size n*8 bits, then +  *! return it. +  *! +  *! Will return -1 if there is not enough buffer space available +  *! unless error mode is set to throw errors. +  */ +  PIKEFUN int read_int( int len ) +  { +  IOBuffer *io = THIS; +  struct object *o; +  +  pop_stack(); +  +  if( len < SIZEOF_INT_TYPE-1 ) /* will for sure fit. */ +  { +  push_int( io_read_number( io, len ) ); +  return; +  } +  +  if( (o = io_read_bignum(io, len )) ) +  { +  push_object(o); +  reduce_stack_top_bignum(); +  return; +  } +  push_int(-1); +  } +  +  /*! @decl void create( string(8bit) x ) +  *! +  *! Create a new buffer with the contents of the given +  *! string. +  *! +  *! @note +  *! This will not copy the string data, instead data will +  *! be read from the string until it needs to be modified, so the +  *! buffer creation is fast regardless of the length of the +  *! string. +  */ +  PIKEFUN void create( string x ) +  flags ID_PROTECTED; +  { +  IOBuffer *this = THIS; +  if( this->buffer ) +  Pike_error("Can not initialize twice.\n"); +  if( x->size_shift ) +  Pike_error("Only string(0..255) supported.\n"); +  this->buffer = (unsigned char*)x->str; +  this->len = x->len; +  this->malloced = 0; +  this->str = x; +  x->refs++; +  } +  +  /*! @decl void create( int|void len ) +  *! +  *! Create a new buffer of the given size. +  *! The buffer will grow if needed, so the length is only the +  *! initial size. +  *! +  *! The default initial size is 4K +  */ +  PIKEFUN void create( int len ) +  flags ID_PROTECTED; +  { +  IOBuffer *this = THIS; +  if( this->buffer ) +  Pike_error("Can not initialize twice.\n"); +  this->buffer = xalloc(len); +  this->allocated = len; +  this->malloced = 1; +  } +  +  PIKEFUN void create( ) +  flags ID_PROTECTED; +  { +  IOBuffer *this = THIS; +  if( this->buffer ) +  Pike_error("Can not initialize twice.\n"); +  this->buffer = xalloc(4096-32); +  this->allocated = 4096-32; +  this->malloced = 1; +  } +  +  +  INIT { +  IOBuffer *this = THIS; +  memset( this, 0, sizeof(IOBuffer)); +  } +  +  EXIT { +  IOBuffer *this = THIS; +  if( this->sub ) +  { +  free_object( this->sub ); +  io_unlock( get_storage(this->sub,IOBuffer_program ) ); +  } +  if( this->str ) +  free_string( this->str ); +  if( this->malloced ) +  free( this->buffer ); +  } + } +  + void init_stdio_buffer(void) + { +  INIT + } +  +  + void exit_stdio_buffer(void) + { +  EXIT + }   Newline at end of file added.