mirror of
https://github.com/xcat2/confluent.git
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71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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int read_part(FILE* img, long int imgsize) {
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char mountpath[65537];
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char devpath[65537];
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char fstype[65537];
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uint16_t shortlength;
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uint32_t length;
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uint64_t longlength;
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fread(&shortlength, 2, 1, img);
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shortlength = be16toh(shortlength);
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fread(mountpath, 1, shortlength, img);
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mountpath[shortlength] = 0;
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fread(&length, 4, 1, img);
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length = be32toh(length);
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fseek(img, length, SEEK_CUR); // skip json section that we don't support
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fread(&longlength, 8, 1, img); // minimum size in bytes
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longlength = be64toh(longlength);
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printf("%ld\t", longlength);
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fread(&longlength, 8, 1, img); // default size in bytes
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longlength = be64toh(longlength);
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printf("%ld\t", longlength);
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fread(&shortlength, 2, 1, img); // length of filesystem type
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shortlength = be16toh(shortlength);
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fread(fstype, 1, shortlength, img);
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fstype[shortlength] = 0;
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fread(&shortlength, 2, 1, img); // length of DEVICE
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shortlength = be16toh(shortlength);
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fread(devpath, 1, shortlength, img);
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devpath[shortlength] = 0;
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fread(&shortlength, 2, 1, img);
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shortlength = be16toh(shortlength);
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fseek(img, shortlength, SEEK_CUR); // Skip the padding
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fread(&longlength, 8, 1, img);
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longlength = be64toh(longlength);
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printf("%ld\t", ftell(img) / 512);
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printf("%ld\t", longlength / 512);
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printf("%s\t%s\t%s\n", fstype, devpath, mountpath);
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fseek(img, longlength, SEEK_CUR);
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return (ftell(img) < imgsize);
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}
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int main(int argc, char* argv[]) {
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FILE* img;
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long int imgsize;
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char buffer[20];
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img = fopen(argv[1], "rb");
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fseek(img, 0, SEEK_END);
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imgsize = ftell(img);
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fseek(img, 0, SEEK_SET);
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if (fread(buffer, 1, 16, img) < 16) {
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fprintf(stderr, "Unable to read header of image\n");
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exit(1);
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}
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if ((memcmp(buffer, "hsqs", 4) == 0) || (memcmp(buffer, "sqsh", 4) == 0)) {
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printf("Format: squashfs\n");
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exit(0);
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}
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if (memcmp(buffer, "\x63\x7b\x9d\x26\xb7\xfd\x48\x30\x89\xf9\x11\xcf\x18\xfd\xff\xa1", 16) != 0) {
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fprintf(stderr, "Unrecognized image format\n");
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exit(1);
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}
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printf("Format: confluent_multisquash\nminsize\tdefsize\toffset\tsize\tfstype\torigdev\tmount\n");
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fseek(img, 31, SEEK_SET);
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while (read_part(img, imgsize));
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}
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