seahag/src/haggis.c

/*                 _,.---._    .-._        .--.-. ,--.--------.
 *   _,..---._   ,-.' , -  `. /==/ \  .-._/==/  //==/,  -   , -\
 * /==/,   -  \ /==/_,  ,  - \|==|, \/ /, |==\ -\\==\.-.  - ,-./
 * |==|   _   _\==|   .=.     |==|-  \|  | \==\- \`--`\==\- \
 * |==|  .=.   |==|_ : ;=:  - |==| ,  | -|  `--`-'     \==\_ \
 * |==|,|   | -|==| , '='     |==| -   _ |             |==|- |
 * |==|  '='   /\==\ -    ,_ /|==|  /\ , |             |==|, |
 * |==|-,   _`/  '.='. -   .' /==/, | |- |             /==/ -/
 * `-.`.____.'     `--`--''   `--`./  `--`             `--`--`
 *                    _ __    ,---.      .-._         .=-.-.  _,.----.
 *                 .-`.' ,`..--.'  \    /==/ \  .-._ /==/_ /.' .' -   \
 *                /==/, -   \==\-/\ \   |==|, \/ /, /==|, |/==/  ,  ,-'
 *               |==| _ .=. /==/-|_\ |  |==|-  \|  ||==|  ||==|-   |  .
 *               |==| , '=',\==\,   - \ |==| ,  | -||==|- ||==|_   `-' \
 *               |==|-  '..'/==/ -   ,| |==| -   _ ||==| ,||==|   _  , |
 *               |==|,  |  /==/-  /\ - \|==|  /\ , ||==|- |\==\.       /
 *               /==/ - |  \==\ _.\=\.-'/==/, | |- |/==/. / `-.`.___.-'
 *               `--`---'   `--`        `--`./  `--``--`-`
 *
 *	@(#)Copyright (c) 2023, Nathan D. Fisher.
 *
 *      This is free software.  It comes with NO WARRANTY.
 *      Permission to use, modify and distribute this source code
 *      is granted subject to the following conditions.
 *      1/ that the above copyright notice and this notice
 *      are preserved in all copies and that due credit be given
 *      to the author.
 *      2/ that any changes to this code are clearly commented
 *      as such so that the author does not get blamed for bugs
 *      other than his own.
 */

#include <stdio.h>
#include <string.h>

#include "haggis.h"

static unsigned char header[7] = {0x89, 'h', 'a', 'g', 'g', 'i', 's'};

int haggis_store_header(FILE *stream) {
    if (fwrite(header, 1, 7, stream) < 7)
        return 1;
    return 0;
}

int haggis_check_header(FILE *stream) {
    unsigned char *buf[7];
    if (fread(buf, 1, 7, stream) < 7)
        return 1;
    if (memcmp(buf, header, 7))
        return 2;
    return 1;
}

int haggis_store_device(FILE *stream, struct haggis_device *dev) {
    u8 major[4];
    u8 minor[4];
    u32_to_le_bytes(dev->major, major);
    u32_to_le_bytes(dev->minor, minor);
    if (fwrite(major, 1, 4, stream) != 4)
        return 1;
    if (fwrite(minor, 1, 4, stream) != 4)
        return 1;
    return 0;
}

int haggis_load_device(FILE *stream, struct haggis_device *dev) {
    u8 major[4];
    u8 minor[4];
    if (fread(major, 1, 4, stream) != 4)
        return 1;
    if (fread(minor, 1, 4, stream) != 4)
        return 1;
    dev->major = le_bytes_to_u32(major);
    dev->minor = le_bytes_to_u32(minor);
    return 0;
}

int haggis_store_cksum(FILE *stream, struct haggis_checksum *cksum) {
    char flag;
    switch (cksum->tag) {
    case md5:
        flag = 0;
        if (fwrite(&flag, 1, 1, stream) != 1)
            return 1;
        if (fwrite(cksum->sum->md5, 1, 16, stream) != 16)
            return 1;
        break;
    case sha1:
        flag = 1;
        if (fwrite(&flag, 1, 1, stream) != 1)
            return 1;
        if (fwrite(cksum->sum->sha1, 1, 20, stream) != 20)
            return 1;
        break;
    case sha256:
        flag = 2;
        if (fwrite(&flag, 1, 1, stream) != 1)
            return 1;
        if (fwrite(cksum->sum->sha256, 1, 32, stream) != 32)
            return 1;
        break;
    case skip:
        flag = 3;
        if (fwrite(&flag, 1, 1, stream) != 1)
            return 1;
        break;
    }
    return 0;
}

int haggis_load_cksum(FILE *stream, struct haggis_checksum *cksum) {
    // todo
    char flag;
    if (fread(&flag, 1, 1, stream) != 1)
        return 1;
    switch (flag) {
    case md5:
        cksum->tag = 0;
        if (fread(&cksum->sum->md5, 1, 16, stream) != 16)
            return 1;
        break;
    case sha1:
        cksum->tag = 1;
        if (fread(&cksum->sum->sha1, 1, 20, stream) != 20)
            return 1;
        break;
    case sha256:
        cksum->tag = 2;
        if (fread(&cksum->sum->sha256, 1, 32, stream) != 32)
            return 1;
        break;
    case skip:
        cksum->tag = 3;
        break;
    }
    return 0;
}

int haggis_store_file(FILE *stream, struct haggis_normal *file) {
    // todo
    return 0;
}

int haggis_load_file(FILE *stream, struct haggis_normal *file) {
    // todo
    return 0;
}

int haggis_store_filetype(FILE *stream, struct haggis_filetype *filetype) {
    // todo
    return 0;
}

int haggis_load_filetype(FILE *stream, struct haggis_filetype *filetype) {
    // todo
    return 0;
}

int haggis_store_node(FILE *stream, struct haggis_node *node) {
    // todo
    return 0;
}

int haggis_load_node(FILE *stream, struct haggis_node *node) {
    // todo
    return 0;
}