--- /dev/null
+#include "lar.h"
+
+int do_print_member( lar_archive *ar, const char *name )
+{
+ lar_member *member;
+
+ if( (member = lar_open_member(ar, name)) != NULL )
+ {
+ write(fileno(stdout), member->data, member->length);
+ lar_close_member(member);
+ }
+ else
+ LAR_DIE("Unable to locate archive member");
+
+ return 0;
+}
+
+int do_print_index( lar_archive *ar )
+{
+ lar_index *index = ar->index;
+ LAR_FNAME(filename);
+
+ while(index)
+ {
+ lar_get_filename(ar, index, filename);
+ printf("%s\n", filename);
+ index = index->next;
+ }
+
+ return 0;
+}
+
+int main( int argc, const char* argv[] )
+{
+ lar_archive *ar;
+
+ if( argv[1] != NULL )
+ {
+ if( (ar = lar_open(argv[1])) != NULL )
+ {
+ if( argv[2] )
+ return do_print_member(ar, argv[2]);
+ else
+ return do_print_index(ar);
+
+ lar_close(ar);
+ }
+ else
+ {
+ LAR_DIE("Failed to open archive");
+ }
+ }
+ else
+ {
+ printf("Usage: lar <archive> [<member>]\n");
+ return 1;
+ }
+
+ return 0;
+}
+
--- /dev/null
+#include "lar.h"
+
+int lar_read32( int fd, uint32_t *val )
+{
+ uint8_t buffer[5];
+
+ if( read(fd, buffer, 4) < 4 )
+ LAR_DIE("Unexpected EOF while reading data");
+
+ buffer[4] = 0;
+ *val = ntohl(*((uint32_t *) buffer));
+
+ return 0;
+}
+
+int lar_read16( int fd, uint16_t *val )
+{
+ uint8_t buffer[3];
+
+ if( read(fd, buffer, 2) < 2 )
+ LAR_DIE("Unexpected EOF while reading data");
+
+ buffer[2] = 0;
+ *val = ntohs(*((uint16_t *) buffer));
+
+ return 0;
+}
+
+lar_index * lar_get_index( lar_archive *ar )
+{
+ uint32_t i;
+ uint32_t idx_offset;
+ uint32_t idx_length;
+ lar_index *idx_map, *idx_ptr;
+
+ if( lseek(ar->fd, -(sizeof(idx_offset)), SEEK_END) == -1 )
+ LAR_DIE("Unable to seek to end of archive");
+
+ lar_read32(ar->fd, &idx_offset);
+ idx_length = ( ar->length - idx_offset - sizeof(idx_offset) );
+
+ if( lseek(ar->fd, idx_offset, SEEK_SET) == -1 )
+ LAR_DIE("Unable to seek to archive index");
+
+
+ idx_map = NULL;
+
+ for( i = 0; i < idx_length; \
+ i += (sizeof(lar_index) - sizeof(char))
+ ) {
+ idx_ptr = (lar_index *)malloc(sizeof(lar_index));
+
+ lar_read32(ar->fd, &idx_ptr->noffset);
+ lar_read32(ar->fd, &idx_ptr->nlength);
+ lar_read32(ar->fd, &idx_ptr->foffset);
+ lar_read32(ar->fd, &idx_ptr->flength);
+ lar_read16(ar->fd, &idx_ptr->type);
+ lar_read16(ar->fd, &idx_ptr->flags);
+
+ idx_ptr->next = idx_map;
+ idx_map = idx_ptr;
+ }
+
+ return idx_map;
+}
+
+uint32_t lar_get_filename( lar_archive *ar,
+ lar_index *idx_ptr, char *filename
+) {
+ if( idx_ptr->nlength >= LAR_FNAME_BUFFER )
+ LAR_DIE("Filename exceeds maximum allowed length");
+
+ if( lseek(ar->fd, idx_ptr->noffset, SEEK_SET) == -1 )
+ LAR_DIE("Unexpected EOF while seeking filename");
+
+ if( read(ar->fd, filename, idx_ptr->nlength) < idx_ptr->nlength )
+ LAR_DIE("Unexpected EOF while reading filename");
+
+ filename[idx_ptr->nlength] = 0;
+
+ return idx_ptr->nlength;
+}
+
+lar_member * lar_open_member( lar_archive *ar, const char *name )
+{
+ lar_index *idx_ptr = ar->index;
+ lar_member *member;
+ char memberfile[LAR_FNAME_BUFFER];
+ char *memberdata;
+ size_t pgsz = getpagesize();
+
+ while(idx_ptr)
+ {
+ lar_get_filename(ar, idx_ptr, memberfile);
+
+ if( !strncmp(memberfile, name, idx_ptr->nlength) )
+ {
+ memberdata = mmap(
+ 0, idx_ptr->flength + ( idx_ptr->foffset % pgsz ),
+ PROT_READ, MAP_PRIVATE, ar->fd,
+ idx_ptr->foffset - ( idx_ptr->foffset % pgsz )
+ );
+
+ if( memberdata == MAP_FAILED )
+ LAR_DIE("Failed to mmap() member data");
+
+ member = (lar_member *)malloc(sizeof(lar_member));
+ member->type = idx_ptr->type;
+ member->flags = idx_ptr->flags;
+ member->length = idx_ptr->flength;
+ member->data = &memberdata[idx_ptr->foffset % pgsz];
+
+ member->mmap = memberdata;
+ member->mlen = idx_ptr->flength + ( idx_ptr->foffset % pgsz );
+
+ return member;
+ }
+
+ idx_ptr = idx_ptr->next;
+ }
+
+ return NULL;
+}
+
+int lar_close_member( lar_member *member )
+{
+ int stat = munmap(member->mmap, member->mlen);
+ free(member);
+
+ return stat;
+}
+
+lar_archive * lar_open( const char *filename )
+{
+ int fd;
+ struct stat as;
+ lar_archive *ar;
+
+ if( stat(filename, &as) == -1 )
+ return NULL;
+
+ if( !(as.st_mode & S_IFREG) )
+ return NULL;
+
+ if( (fd = open(filename, O_RDONLY)) != -1 )
+ {
+ ar = (lar_archive *)malloc(sizeof(lar_archive));
+ ar->fd = fd;
+ ar->length = as.st_size;
+ ar->index = lar_get_index(ar);
+ strncpy(ar->filename, filename, sizeof(ar->filename));
+
+ return ar;
+ }
+
+ return NULL;
+}
+
+int lar_close( lar_archive *ar )
+{
+ lar_index *idx_head;
+ lar_index *idx_next;
+
+ close(ar->fd);
+
+ idx_head = ar->index;
+ do {
+ idx_next = idx_head->next;
+ free(idx_head);
+ } while( (idx_head = idx_next) != NULL );
+
+ free(ar);
+
+ return 0;
+}
+
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+
+int errno;
+
+#define LAR_DIE(s) \
+ do { \
+ fprintf(stderr, "%s(%i): %s(): %s\n", \
+ __FILE__, __LINE__, __FUNCTION__, s); \
+ if( errno ) fprintf(stderr, "%s(%i): %s\n", \
+ __FILE__, __LINE__, strerror(errno) ); \
+ exit(1); \
+ } while(0)
+
+
+#define LAR_FNAME_BUFFER 1024
+#define LAR_FNAME(s) char s[LAR_FNAME_BUFFER]
+
+
+struct lar_index_item {
+ uint32_t noffset;
+ uint32_t nlength;
+ uint32_t foffset;
+ uint32_t flength;
+ uint16_t type;
+ uint16_t flags;
+ struct lar_index_item *next;
+};
+
+struct lar_member_item {
+ uint16_t type;
+ uint16_t flags;
+ uint32_t length;
+ char *data;
+ char *mmap;
+ size_t mlen;
+};
+
+struct lar_archive_handle {
+ int fd;
+ off_t length;
+ char filename[LAR_FNAME_BUFFER];
+ struct lar_index_item *index;
+};
+
+typedef struct lar_index_item lar_index;
+typedef struct lar_member_item lar_member;
+typedef struct lar_archive_handle lar_archive;
+
+
+int lar_read32( int fd, uint32_t *val );
+int lar_read16( int fd, uint16_t *val );
+
+lar_index * lar_get_index( lar_archive *ar );
+
+uint32_t lar_get_filename( lar_archive *ar,
+ lar_index *idx_ptr, char *filename );
+
+lar_member * lar_open_member( lar_archive *ar, const char *name );
+
+int lar_close_member( lar_member *member );
+
+lar_archive * lar_open( const char *filename );
+
+int lar_close( lar_archive *ar );
+
+
--- /dev/null
+#!/usr/bin/perl
+
+use strict;
+
+@ARGV || die "Usage: $0 <file1> <file2> ... <fileN>\n";
+
+my @index;
+my $offset = 0;
+
+foreach my $file ( @ARGV )
+{
+ if( -f $file && open F, "< $file" )
+ {
+ warn sprintf "Member at 0x%08X\n", $offset;
+ push @index, [ ];
+
+ my $size = length $file;
+
+ print $file;
+ print "\0" x ( $size % 4 );
+
+ $index[-1][0] = $offset;
+ $index[-1][1] = $size;
+ $index[-1][2] = $offset + $size + ( $size % 4 );
+
+
+ $size = 0;
+ while( read F, my $buffer, 4096 ) {
+ $size += length $buffer;
+ print $buffer;
+ }
+ print "\0" x ( $size % 4 );
+
+ $index[-1][3] = $size;
+ $offset = $index[-1][2] + $size + ( $size % 4 );
+
+ close F;
+ }
+}
+
+
+foreach my $file ( @index )
+{
+ warn sprintf "Index: 0x%08X 0x%08X 0x%08X 0x%08X\n", $file->[0], $file->[1], $file->[2], $file->[3];
+ print pack "NNNNnn", $file->[0], $file->[1], $file->[2], $file->[3], 0x0000, 0x0000;
+}
+
+warn sprintf "Index at 0x%08X, length 0x%08X\n", $offset, @index * 20;
+print pack "N", $offset;
+
projects / oweals / luci.git / commitdiff