FreeCalypso > hg > freecalypso-tools
view ffstools/tiffs-rd/basics.c @ 619:f82551c77e58
libserial-newlnx: ASYNC_LOW_LATENCY patch reverted
Reports from Das Signal indicate that loadtools performance on Debian
is about the same as on Slackware, and that including or omitting the
ASYNC_LOW_LATENCY patch from Serg makes no difference. Because the
patch in question does not appear to be necessary, it is being reverted
until and unless someone other than Serg reports an actual real-world
system on which loadtools operation times are slowed compared to the
Mother's Slackware reference and on which Slackware-like performance
can be restored by setting the ASYNC_LOW_LATENCY flag.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Thu, 27 Feb 2020 01:09:48 +0000 |
parents | e7502631a0f9 |
children |
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/* * This C module implements the "basics" of TIFFS image analysis. */ #include <sys/types.h> #include <sys/file.h> #include <sys/stat.h> #include <sys/mman.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <strings.h> #include "types.h" #include "struct.h" #include "globals.h" u8 tiffs_header[6] = {'F', 'f', 's', '#', 0x10, 0x02}; read_ffs_image() { int fd; struct stat st; fd = open(imgfile, O_RDONLY); if (fd < 0) { perror(imgfile); exit(1); } fstat(fd, &st); if (!S_ISREG(st.st_mode)) { fprintf(stderr, "error: %s is not a regular file\n", imgfile); exit(1); } if (st.st_size < imgfile_offset) { fprintf(stderr, "error: offset given with -o exceeds the size of the file\n"); exit(1); } if (st.st_size - imgfile_offset < total_ffs_size) { fprintf(stderr, "error: %s is shorter than FFS size of 0x%lx bytes\n", imgfile, (u_long)total_ffs_size); exit(1); } image = mmap(NULL, total_ffs_size, PROT_READ, MAP_PRIVATE, fd, imgfile_offset); if (image == MAP_FAILED) { perror("mmap"); exit(1); } close(fd); } cmd_blkhdr() { int blk; u8 *blkhdr; read_ffs_image(); for (blk = 0; blk < total_blocks; blk++) { printf("Block %3d: ", blk); blkhdr = image + blk * eraseblk_size; if (bcmp(blkhdr, tiffs_header, sizeof tiffs_header)) { printf("No TIFFS header\n"); continue; } printf("age %02X%02X, type/status %02X\n", blkhdr[7], blkhdr[6], blkhdr[8]); } exit(0); } find_inode_block() { int i, abcnt; u8 *ptr; if (index_blk_num >= 0) { if (index_blk_num >= total_blocks) { fprintf(stderr, "invalid block # given with the -a option\n"); exit(1); } ptr = image + index_blk_num * eraseblk_size; if (bcmp(ptr, tiffs_header, sizeof tiffs_header)) { fprintf(stderr, "error: block specified with -a has no TIFFS header\n"); exit(1); } if (ptr[8] != 0xAB) { fprintf(stderr, "error: block specified with -a is not an AB block\n"); exit(1); } inode_block = ptr; return(0); } abcnt = 0; for (ptr = image, i = 0; i < total_blocks; i++, ptr += eraseblk_size) { if (bcmp(ptr, tiffs_header, sizeof tiffs_header)) { fprintf(stderr, "warning: no TIFFS signature in erase block #%d (offset %x)\n", i, ptr - image); continue; } switch (ptr[8]) { case 0xAB: if (verbose) fprintf(stderr, "Found AB index in erase block #%d (offset %x)\n", i, ptr - image); index_blk_num = i; inode_block = ptr; abcnt++; continue; case 0xBD: case 0xBF: continue; } fprintf(stderr, "warning: unexpected block type/status %02X at offset %x\n", ptr[8], ptr - image); } if (!inode_block) { fprintf(stderr, "error: could not find an active inode block in %s\n", imgfile); exit(1); } if (abcnt > 1) { fprintf(stderr, "error: found more than one AB block; use -a\n"); exit(1); } return(0); } cmd_fsinfo() { read_ffs_image(); find_inode_block(); printf("Active inode block (AB) is block #%d\n", index_blk_num); alloc_inode_table(); find_root_inode(); printf("Root inode is #%x\n", root_inode); if (validate_obj_name(root_inode, 1)) { printf("Root inode (format) name: %s\n", inode_info[root_inode]->dataptr); exit(0); } else { printf("No valid name found in the root inode!\n"); exit(1); } }