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cpython/BeOS/ar-1.1/mwlib.c

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/*
** mwlib.c - POSIX 1003.2 "ar" command
**
** This isn't a pure POSIX 1003.2 ar; it only manipulates Metrowerks
** Library files, not general-purpose POSIX 1003.2 format archives.
**
** Dec. 14, 1997 Chris Herborth (chrish@kagi.com)
**
** This code is donated to the PUBLIC DOMAIN. You can use, abuse, modify,
** redistribute, steal, or otherwise manipulate this code. No restrictions
** at all. If you laugh at this code, you can't use it.
**
** This "ar" was implemented using IEEE Std 1003.2-1992 as the basis for
** the interface, and Metrowerk's published docs detailing their library
** format. Look inside for clues about how reality differs from MW's
** documentation on BeOS...
*/
#include <support/Errors.h>
#include <support/byteorder.h>
#ifndef NO_DEBUG
#include <assert.h>
#define ASSERT(cond) assert(cond)
#else
#define ASSERT(cond) ((void)0)
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <string.h>
#include <errno.h>
#include <kernel/fs_attr.h>
#include <fcntl.h> /* is open() really here?!? sheesh... */
#include <storage/Mime.h>
#include <sys/stat.h>
#include "mwlib.h"
#include "copy_attrs.h"
static const char *rcs_version_id = "$Id$";
/* ----------------------------------------------------------------------
** Local prototypes
*/
static status_t load_MWLibFile( FILE *file, MWLibFile *libfile );
static size_t fwrite_big32( uint32 x, FILE *fp );
static size_t fwrite_big32_seek( uint32 x, long offset, FILE *fp );
static status_t add_object_sizes( MWObject *obj, uint32 *code, uint32 *data );
/* ----------------------------------------------------------------------
** Load a Metrowerks library file into the given MWLib object.
**
** Returns:
** B_OK - all is well
** B_FILE_NOT_FOUND - can't open the given file
** B_IO_ERROR - can't read from the given file
** B_BAD_VALUE - invalid magic word in the file
** B_MISMATCHED_VALUES - invalid processor value (ie, not a PowerPC lib),
** or the magicflags member is not 0, or the file
** version number isn't 1.
** B_NO_MEMORY - unable to allocate memory while loading the lib
*/
status_t load_MW_lib( MWLib *lib, const char *filename )
{
FILE *fp = NULL;
size_t recs = 0;
status_t retval = B_OK;
uint32 tmp32 = 0;
uint32 idx = 0;
char obj_name[PATH_MAX];
ASSERT( lib != NULL );
ASSERT( filename != NULL );
fp = fopen( filename, "r" );
if( !fp ) {
return B_FILE_NOT_FOUND;
}
/* Read and check the magic number.
*/
recs = fread( &tmp32, sizeof( uint32 ), 1, fp );
lib->header.magicword = B_BENDIAN_TO_HOST_INT32( tmp32 );
if( recs != 1 ) {
retval = B_IO_ERROR;
goto close_return;
} else if( lib->header.magicword != MWLIB_MAGIC_WORD ) {
retval = B_BAD_VALUE;
goto close_return;
}
/* Read and check the processor.
*/
recs = fread( &tmp32, sizeof( uint32 ), 1, fp );
lib->header.magicproc = B_BENDIAN_TO_HOST_INT32( tmp32 );
if( recs != 1 ) {
retval = B_IO_ERROR;
goto close_return;
} else if( lib->header.magicproc != MWLIB_MAGIC_PROC ) {
retval = B_MISMATCHED_VALUES;
goto close_return;
}
/* Read and check the flags.
*/
recs = fread( &tmp32, sizeof( uint32 ), 1, fp );
lib->header.magicflags = B_BENDIAN_TO_HOST_INT32( tmp32 );
if( recs != 1 ) {
retval = B_IO_ERROR;
goto close_return;
} else if( lib->header.magicflags != 0 ) {
retval = B_MISMATCHED_VALUES;
goto close_return;
}
/* Read and check the file version.
*/
recs = fread( &tmp32, sizeof( uint32 ), 1, fp );
lib->header.version = B_BENDIAN_TO_HOST_INT32( tmp32 );
if( recs != 1 ) {
retval = B_IO_ERROR;
goto close_return;
} else if( lib->header.version != 1 ) {
retval = B_MISMATCHED_VALUES;
goto close_return;
}
/* Read the code size, data size, and number of objects.
*/
recs = fread( &tmp32, sizeof( uint32 ), 1, fp );
lib->header.code_size = B_BENDIAN_TO_HOST_INT32( tmp32 );
if( recs != 1 ) {
retval = B_IO_ERROR;
goto close_return;
}
recs = fread( &tmp32, sizeof( uint32 ), 1, fp );
lib->header.data_size = B_BENDIAN_TO_HOST_INT32( tmp32 );
if( recs != 1 ) {
retval = B_IO_ERROR;
goto close_return;
}
recs = fread( &tmp32, sizeof( uint32 ), 1, fp );
lib->header.num_objects = B_BENDIAN_TO_HOST_INT32( tmp32 );
if( recs != 1 ) {
retval = B_IO_ERROR;
goto close_return;
}
/* Load the MWLibFile objects from the lib.
*/
lib->files = (MWLibFile *)malloc( lib->header.num_objects * sizeof( MWLibFile ) );
if( lib->files == NULL ) {
retval = B_NO_MEMORY;
goto close_return;
}
for( idx = 0; idx < lib->header.num_objects; idx++ ) {
retval = load_MWLibFile( fp, &(lib->files[idx]) );
if( retval != B_OK ) {
goto close_return;
}
}
/* Load the file names and object data.
**
** The file name actually appears twice in the library file; according
** to the docs, one is the file name, the other is the "full path name".
** In all of the libraries on my system, they're the same.
*/
lib->names = (char **)malloc( lib->header.num_objects * sizeof( char * ) );
lib->data = (char **)malloc( lib->header.num_objects * sizeof( char * ) );
if( lib->names == NULL || lib->data == NULL ) {
retval = B_NO_MEMORY;
goto close_return;
}
for( idx = 0; idx < lib->header.num_objects; idx ++ ) {
/* Load the name and copy it into the right spot.
*/
retval = fseek( fp, lib->files[idx].off_filename, SEEK_SET );
if( retval ) {
retval = B_IO_ERROR;
goto close_return;
}
if( fgets( obj_name, PATH_MAX, fp ) == NULL ) {
retval = B_IO_ERROR;
goto close_return;
}
lib->names[idx] = strdup( obj_name );
if( lib->names[idx] == NULL ) {
retval = B_NO_MEMORY;
goto close_return;
}
/* Load the object data.
*/
lib->data[idx] = (char *)malloc( lib->files[idx].object_size );
if( lib->data[idx] == NULL ) {
retval = B_NO_MEMORY;
goto close_return;
}
retval = fseek( fp, lib->files[idx].off_object, SEEK_SET );
if( retval ) {
retval = B_IO_ERROR;
goto close_return;
}
recs = fread( lib->data[idx], lib->files[idx].object_size, 1, fp );
if( recs != 1 ) {
retval = B_IO_ERROR;
goto close_return;
}
}
close_return:
fclose( fp );
return retval;
}
/* ----------------------------------------------------------------------
** Load the file header from a Metrowerks library file.
**
** Returns:
** B_OK - All is well
** B_IO_ERROR - Error reading the file
*/
static status_t load_MWLibFile( FILE *file, MWLibFile *libfile )
{
size_t recs = 0;
uint32 tmp32 = 0;
ASSERT( file != NULL );
ASSERT( libfile != NULL );
/* Load the modification time.
*/
recs = fread( &tmp32, sizeof( uint32 ), 1, file );
libfile->m_time = (time_t)B_BENDIAN_TO_HOST_INT32( tmp32 );
if( recs != 1 ) {
return B_IO_ERROR;
}
/* Load the various offsets.
*/
recs = fread( &tmp32, sizeof( uint32 ), 1, file );
libfile->off_filename = B_BENDIAN_TO_HOST_INT32( tmp32 );
if( recs != 1 ) {
return B_IO_ERROR;
}
recs = fread( &tmp32, sizeof( uint32 ), 1, file );
libfile->off_fullpath = B_BENDIAN_TO_HOST_INT32( tmp32 );
if( recs != 1 ) {
return B_IO_ERROR;
}
recs = fread( &tmp32, sizeof( uint32 ), 1, file );
libfile->off_object = B_BENDIAN_TO_HOST_INT32( tmp32 );
if( recs != 1 ) {
return B_IO_ERROR;
}
/* Load the object size.
*/
recs = fread( &tmp32, sizeof( uint32 ), 1, file );
libfile->object_size = B_BENDIAN_TO_HOST_INT32( tmp32 );
if( recs != 1 ) {
return B_IO_ERROR;
}
return B_OK;
}
/* ----------------------------------------------------------------------
** Write a Metrowerks library file.
**
** Returns:
** B_OK - all is well; doesn't necessarily mean the file was written
** properly, just that you didn't lose any data
** B_NO_MEMORY - unable to allocate offset buffers
** B_ERROR - problem with backup file (can't rename existing file)
**
** Note:
** If you use this in a long-lived program, it leaks memory; the MWLib
** contents are never free()'d.
**
** Two-pass technique:
**
** pass 1 - write file header (need CODE SIZE and DATA SIZE)
** write object headers (need offsets for FILENAME, FULL PATH, DATA)
** write filenames (store offsets for object headers)
** write padding (file size % 4 bytes)
** write file data (store offset for object header; add to code/data
** size for file header; pad data size % 4 bytes)
**
** pass 2 - fill in file header CODE SIZE and DATA SIZE
** fill in object headers FILENAME, FULL PATH, DATA
**
** You could avoid this by building up the file headers in memory, but this is
** easier (?) and I'm not that concerned with speed...
**
*/
typedef struct file_header_offsets {
long codesize_offset;
long datasize_offset;
} file_header_offsets;
typedef struct obj_header_offsets {
long filename_offset;
uint32 filename_offset_value;
long fullpath_offset;
uint32 fullpath_offset_value;
long data_offset;
uint32 data_offset_value;
} obj_header_offsets;
static size_t fwrite_big32( uint32 x, FILE *fp )
{
uint32 tmp32 = B_HOST_TO_BENDIAN_INT32( x );
ASSERT( fp != NULL );
return fwrite( &tmp32, sizeof(tmp32), 1, fp );
}
static size_t fwrite_big32_seek( uint32 x, long offset, FILE *fp )
{
uint32 tmp32 = B_HOST_TO_BENDIAN_INT32( x );
ASSERT( fp != NULL );
if( fseek( fp, offset, SEEK_SET ) ) {
return 0;
}
return fwrite( &tmp32, sizeof(tmp32), 1, fp );
}
static status_t add_object_sizes( MWObject *obj, uint32 *code, uint32 *data )
{
ASSERT( obj != NULL );
ASSERT( code != NULL );
ASSERT( data != NULL );
if( B_BENDIAN_TO_HOST_INT32( obj->magic_word ) != 'MWOB' ||
B_BENDIAN_TO_HOST_INT32( obj->arch ) != 'PPC ' ) {
return B_ERROR;
}
*code += B_BENDIAN_TO_HOST_INT32( obj->code_size );
*data += B_BENDIAN_TO_HOST_INT32( obj->data_size );
return B_OK;
}
void setfiletype( const char *file, const char *type )
{
int fd;
attr_info fa;
ssize_t wrote_bytes;
fd = open( file, O_RDWR );
if( fd < 0 ) {
fprintf( stderr, "ar: can't open %s to write file type, %s",
file, strerror( errno ) );
return;
}
fa.type = B_MIME_STRING_TYPE;
fa.size = (off_t)(strlen( type ) + 1);
wrote_bytes = fs_write_attr( fd, "BEOS:TYPE", fa.type, 0,
type, fa.size );
if( wrote_bytes != (ssize_t)fa.size ) {
fprintf( stderr, "ar: couldn't write complete file type, %s",
strerror( errno ) );
}
close( fd );
}
status_t write_MW_lib( MWLib *lib, const char *filename )
{
char *padding = "\0\0\0\0";
long pad_amount;
file_header_offsets head_offs;
obj_header_offsets *obj_offs;
uint32 codesize = 0;
uint32 datasize = 0;
uint32 num_objects = 0;
FILE *fp;
char *tmp_filename = NULL;
uint32 idx = 0;
size_t recs;
status_t retval;
mode_t mode_bits = 0666;
ASSERT( lib != NULL );
ASSERT( filename != NULL );
#if 0
/* Apparently, I don't understand umask()... */
/* Find the default file creation mask. The semantics of umask() suck.
*/
mode_bits = umask( (mode_t)0 );
(void)umask( mode_bits );
#endif
/* Easier access to the number of objects.
*/
num_objects = lib->header.num_objects;
/* Allocate some storage for keeping track of the things we need to
** write out in the second pass.
*/
head_offs.codesize_offset = 0;
head_offs.datasize_offset = 0;
obj_offs = (obj_header_offsets *)malloc( sizeof(obj_header_offsets) *
num_objects );
if( obj_offs == NULL ) {
fprintf( stderr, "ar: can't allocate memory for writing file\n" );
return B_NO_MEMORY;
}
memset( obj_offs, 0, sizeof(obj_header_offsets) * num_objects );
/* If the file exists, move it somewhere so we can recover if there's
** an error.
*/
retval = access( filename, F_OK );
if( retval == 0 ) {
struct stat s;
/* Preserve the mode bits.
*/
retval = stat( filename, &s );
if( retval != 0 ) {
fprintf( stderr, "ar: can't stat %s, %s\n", filename,
strerror( errno ) );
} else {
mode_bits = s.st_mode;
}
tmp_filename = (char *)malloc( strlen( filename ) + 2 );
if( tmp_filename == NULL ) {
fprintf( stderr,
"ar: can't allocate memory for temporary filename\n" );
} else {
sprintf( tmp_filename, "%s~", filename );
retval = access( tmp_filename, F_OK );
if( retval == 0 ) {
retval = unlink( tmp_filename );
if( retval != 0 ) {
fprintf( stderr, "ar: can't unlink %s, %s\n", tmp_filename,
strerror( errno ) );
free( tmp_filename );
tmp_filename = NULL;
}
}
if( tmp_filename ) {
retval = rename( filename, tmp_filename );
if( retval != 0 ) {
fprintf( stderr, "ar: can't move %s to backup, %s\n",
filename, strerror( errno ) );
return B_ERROR;
}
}
}
}
/* Attempt to open the archive file.
*/
fp = fopen( filename, "w" );
if( fp == NULL ) {
fprintf( stderr, "ar: can't open %s for write, %s\n", filename,
strerror( errno ) );
goto error_return;
}
/* ----------------------------------------------------------------------
** Write the file. Pass 1.
*/
recs = fwrite_big32( lib->header.magicword, fp );
recs += fwrite_big32( lib->header.magicproc, fp );
recs += fwrite_big32( lib->header.magicflags, fp );
recs += fwrite_big32( lib->header.version, fp );
if( recs != 4 ) {
fprintf( stderr, "ar: error writing header for %s, %s\n", filename,
strerror( errno ) );
goto error_return;
}
/* Keep track of the code/data size offsets.
*/
head_offs.codesize_offset = ftell( fp );
recs = fwrite_big32( codesize, fp );
head_offs.datasize_offset = ftell( fp );
recs += fwrite_big32( datasize, fp );
if( recs != 2 ) {
fprintf( stderr, "ar: error writing header for %s, %s\n", filename,
strerror( errno ) );
goto error_return;
}
recs = fwrite_big32( num_objects, fp );
if( recs != 1 ) {
fprintf( stderr, "ar: error writing header for %s, %s\n", filename,
strerror( errno ) );
goto error_return;
}
/* Write the object headers.
*/
for( idx = 0; idx < num_objects; idx++ ) {
recs = fwrite_big32( lib->files[idx].m_time, fp );
/* Keep track of the offsets, and write 0 for now.
*/
obj_offs[idx].filename_offset = ftell( fp );
recs += fwrite_big32( 0, fp );
obj_offs[idx].fullpath_offset = ftell( fp );
recs += fwrite_big32( 0, fp );
obj_offs[idx].data_offset = ftell( fp );
recs += fwrite_big32( 0, fp );
recs += fwrite_big32( lib->files[idx].object_size, fp );
if( recs != 5 ) {
fprintf( stderr, "ar: error writing object header for %s, %s\n",
filename, strerror( errno ) );
goto error_return;
}
}
/* Write the file names.
*/
for( idx = 0; idx < num_objects; idx++ ) {
/* Need to make sure that all the file names we write into the
** library DO NOT HAVE PATHS IN THEM, the world might end or something.
*/
size_t name_len = 0;
char *name_ptr = strrchr( lib->names[idx], '/' );
if( name_ptr == NULL ) {
name_ptr = lib->names[idx];
} else {
name_ptr++;
}
name_len = strlen( name_ptr ) + 1;
obj_offs[idx].filename_offset_value = ftell( fp );
recs = fwrite( name_ptr, name_len, 1, fp );
obj_offs[idx].fullpath_offset_value = ftell( fp );
recs += fwrite( name_ptr, name_len, 1, fp );
if( recs != 2 ) {
fprintf( stderr, "ar: error writing object name for %s, %s\n",
filename, strerror( errno ) );
goto error_return;
}
}
/* Pad the file if necessary.
*/
pad_amount = ftell( fp ) % 4;
if( pad_amount > 0 ) {
recs = fwrite( padding, pad_amount, 1, fp );
if( recs != 1 ) {
fprintf( stderr, "ar: error padding file %s, %s\n", filename,
strerror( errno ) );
goto error_return;
}
}
/* Write the object file data.
*/
for( idx = 0; idx < num_objects; idx++ ) {
obj_offs[idx].data_offset_value = ftell( fp );
recs = fwrite( lib->data[idx], lib->files[idx].object_size, 1, fp );
if( recs != 1 ) {
fprintf( stderr, "ar: writing object data for %s, %s\n", filename,
strerror( errno ) );
goto error_return;
}
/* Add up the code/data size.
*/
retval = add_object_sizes( (MWObject *)lib->data[idx],
&codesize, &datasize );
if( retval != B_OK ) {
fprintf( stderr, "ar - warning: %s is not an object file!\n",
lib->names[idx] );
goto error_return;
}
pad_amount = ftell( fp ) % 4;
if( pad_amount > 0 ) {
recs = fwrite( padding, pad_amount, 1, fp );
if( recs != 1 ) {
fprintf( stderr, "ar: error padding file %s, %s\n", filename,
strerror( errno ) );
goto error_return;
}
}
}
/* ----------------------------------------------------------------------
** Write the offsets into the file. Pass 2.
*/
/* Write the code/data sizes.
*/
recs = fwrite_big32_seek( codesize, head_offs.codesize_offset, fp );
recs += fwrite_big32_seek( datasize, head_offs.datasize_offset, fp );
if( recs != 2 ) {
fprintf( stderr, "ar - error writing code and data sizes, %s\n",
strerror( errno ) );
goto error_return;
}
/* Write the offsets for each file.
*/
for( idx = 0; idx < num_objects; idx++ ) {
recs = fwrite_big32_seek( obj_offs[idx].filename_offset_value,
obj_offs[idx].filename_offset, fp );
recs += fwrite_big32_seek( obj_offs[idx].fullpath_offset_value,
obj_offs[idx].fullpath_offset, fp );
recs += fwrite_big32_seek( obj_offs[idx].data_offset_value,
obj_offs[idx].data_offset, fp );
if( recs != 3 ) {
fprintf( stderr, "ar - error writing object offsets, %s\n",
strerror( errno ) );
goto error_return;
}
}
/* If all is OK, close the file and get out of here after nuking the
** temp file (if any), preserving the original file mode, and preserving
** the file attributes.
*/
fclose( fp );
/* Preserve the original file mode bits.
*/
retval = chmod( filename, mode_bits );
if( retval != 0 ) {
fprintf( stderr, "ar: unable to change file mode for %s, %s\n",
filename, strerror( errno ) );
}
/* Nuke the temp file (if any), after copying over any file attributes.
*/
if( tmp_filename != NULL ) {
retval = copy_attrs( filename, tmp_filename );
retval = unlink( tmp_filename );
if( retval != 0 ) {
fprintf( stderr, "ar - error unlinking %s, %s\n", tmp_filename,
strerror( errno ) );
}
free( tmp_filename );
} else {
/* If there isn't a temp file, we should still give this new
** file a file type attribute.
*/
setfiletype( filename, "application/x-mw-library" );
}
return B_OK;
error_return:
/* Restore the original file if we had any problems.
*/
fclose( fp );
if( tmp_filename != NULL ) {
retval = unlink( filename );
retval = rename( tmp_filename, filename );
if( retval != 0 ) {
fprintf( stderr, "ar: can't restore %s to %s, %s\n",
tmp_filename, filename, strerror( errno ) );
}
}
return B_ERROR;
}
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