common.c

Common functions for tools

Copyright (c) 2016 Bartek Fabiszewski http://www.fabiszewski.net

Licensed under LGPL, either version 3, or any later. See http://www.gnu.org/licenses/

 
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <mobi.h>
#include "common.h"
 
#ifdef _WIN32
# include <direct.h>
# define mkdir(path,flags) _mkdir(path)
const char separator = '\\';
#else
const char separator = '/';
#endif
bool outdir_opt = false;
char outdir[FILENAME_MAX];
 
#define UNUSED(x) (void)(x)
 
#ifndef min
# define min(a, b) ((a) < (b) ? (a) : (b))
#endif
 
const char *libmobi_messages[] = {
    "Success",
    "Generic error",
    "Wrong function parameter",
    "Corrupted data",
    "File not found",
    "Document is encrypted",
    "Unsupported document format",
    "Memory allocation error",
    "Initialization error",
    "Buffer error",
    "XML error",
    "Invalid DRM pid",
    "DRM key not found",
    "DRM support not included",
    "Write failed",
    "DRM expired"
};
 
#define LIBMOBI_MSG_COUNT ARRAYSIZE(libmobi_messages)
 
const char * libmobi_msg(const MOBI_RET ret) {
    size_t index = ret;
    if (index < LIBMOBI_MSG_COUNT) {
        return libmobi_messages[index];
    }
    return "Unknown error";
}
 
void split_fullpath(const char *fullpath, char *dirname, char *basename, const size_t buf_len) {
    if (buf_len == 0) {
        return;
    }
    char *p = strrchr(fullpath, separator);
    if (p) {
        p += 1;
        if (dirname) {
            size_t dirlen = min(buf_len - 1, (size_t) (p - fullpath));
            strncpy(dirname, fullpath, dirlen);
            dirname[dirlen] = '\0';
        }
        if (basename) {
            strncpy(basename, p, buf_len - 1);
            basename[buf_len - 1] = '\0';
        }
    }
    else {
        if (dirname) {
            dirname[0] = '\0';
        }
        if (basename) {
            strncpy(basename, fullpath, buf_len - 1);
            basename[buf_len - 1] = '\0';
        }
    }
    if (basename) {
        p = strrchr(basename, '.');
        if (p) {
            *p = '\0';
        }
    }
}
 
int make_directory(const char *path) {
    errno = 0;
    if (mkdir(path, S_IRWXU) != 0 && errno != EEXIST) {
        int errsv = errno;
        printf("Creating directory \"%s\" failed (%s)\n", path, strerror(errsv));
        return ERROR;
    }
    return SUCCESS;
}
 
int create_subdir(char *newdir, const size_t buf_len, const char *parent_dir, const char *subdir_name) {
    int n = snprintf(newdir, buf_len, "%s%c%s", parent_dir, separator, subdir_name);
    if (n < 0) {
        printf("Creating file name failed\n");
        return ERROR;
    }
    if ((size_t) n >= buf_len) {
        printf("File name too long: %s\n", newdir);
        return ERROR;
    }
    return make_directory(newdir);
}
 
int write_file(const unsigned char *buffer, const size_t len, const char *path) {
    errno = 0;
    FILE *file = fopen(path, "wb");
    if (file == NULL) {
        int errsv = errno;
        printf("Could not open file for writing: %s (%s)\n", path, strerror(errsv));
        return ERROR;
    }
    size_t n = fwrite(buffer, 1, len, file);
    if (n != len) {
        int errsv = errno;
        printf("Error writing to file: %s (%s)\n", path, strerror(errsv));
        fclose(file);
        return ERROR;
    }
    fclose(file);
    return SUCCESS;
}
 
int write_to_dir(const char *dir, const char *name, const unsigned char *buffer, const size_t len) {
    char path[FILENAME_MAX];
    int n = snprintf(path, sizeof(path), "%s%c%s", dir, separator, name);
    if (n < 0) {
        printf("Creating file name failed\n");
        return ERROR;
    }
    if ((size_t) n >= sizeof(path)) {
        printf("File name too long\n");
        return ERROR;
    }
    return write_file(buffer, len, path);
}
 
bool dir_exists(const char *path) {
    struct stat sb;
    if (stat(path, &sb) != 0) {
        int errsv = errno;
        printf("Path \"%s\" is not accessible (%s)\n", path, strerror(errsv));
        return false;
    }
    if (!S_ISDIR(sb.st_mode)) {
        printf("Path \"%s\" is not a directory\n", path);
        return false;
    }
    return true;
}
 
void normalize_path(char *path) {
#ifdef _WIN32
    if (path != NULL) {
        for (size_t i = 0; i <= strlen(path); i++) {
            if (path[i] == '/') {
                path[i] = separator;
            }
        }
    }
#else
    UNUSED(path);
#endif
}
 
 
void print_summary(const MOBIData *m) {
    char *title = mobi_meta_get_title(m);
    if (title) {
        printf("Title: %s\n", title);
        free(title);
    }
    char *author = mobi_meta_get_author(m);
    if (author) {
        printf("Author: %s\n", author);
        free(author);
    }
    char *contributor = mobi_meta_get_contributor(m);
    uint32_t major = 0, minor = 0, build = 0;
    bool is_calibre = false;
    if (contributor) {
        const char *calibre_contributor = "calibre (";
        if (strncmp(contributor, calibre_contributor, strlen(calibre_contributor)) == 0) {
            is_calibre = true;
            sscanf(contributor, "calibre (%u.%u.%u)", &major, &minor, &build);
        } else {
            printf("Contributor: %s\n", contributor);
        }
        free(contributor);
    }
    char *subject = mobi_meta_get_subject(m);
    if (subject) {
        printf("Subject: %s\n", subject);
        free(subject);
    }
    char *publisher = mobi_meta_get_publisher(m);
    if (publisher) {
        printf("Publisher: %s\n", publisher);
        free(publisher);
    }
    char *date = mobi_meta_get_publishdate(m);
    if (date) {
        printf("Publishing date: %s\n", date);
        free(date);
    }
    char *description = mobi_meta_get_description(m);
    if (description) {
        printf("Description: %s\n", description);
        free(description);
    }
    char *review = mobi_meta_get_review(m);
    if (review) {
        printf("Review: %s\n", review);
        free(review);
    }
    char *imprint = mobi_meta_get_imprint(m);
    if (imprint) {
        printf("Imprint: %s\n", imprint);
        free(imprint);
    }
    char *copyright = mobi_meta_get_copyright(m);
    if (copyright) {
        printf("Copyright: %s\n", copyright);
        free(copyright);
    }
    char *isbn = mobi_meta_get_isbn(m);
    if (isbn) {
        printf("ISBN: %s\n", isbn);
        free(isbn);
    }
    char *asin = mobi_meta_get_asin(m);
    if (asin) {
        printf("ASIN: %s\n", asin);
        free(asin);
    }
    char *language = mobi_meta_get_language(m);
    if (language) {
        printf("Language: %s", language);
        free(language);
        if (m->mh && m->mh->text_encoding) {
            uint32_t encoding = *m->mh->text_encoding;
            if (encoding == MOBI_CP1252) {
                printf(" (cp1252)");
            } else if (encoding == MOBI_UTF8) {
                printf(" (utf8)");
            }
        }
        printf("\n");
    }
    if (mobi_is_dictionary(m)) {
        printf("Dictionary");
        if (m->mh && m->mh->dict_input_lang && m->mh->dict_output_lang &&
            *m->mh->dict_input_lang && *m->mh->dict_output_lang) {
            const char *locale_in = mobi_get_locale_string(*m->mh->dict_input_lang);
            const char *locale_out = mobi_get_locale_string(*m->mh->dict_output_lang);
            printf(": %s => %s", locale_in ? locale_in : "unknown", locale_out ? locale_out : "unknown");
        }
        printf("\n");
    }
    printf("__\n");
    if (strcmp(m->ph->type, "TEXt") == 0) {
        if (strcmp(m->ph->creator, "TlDc") == 0) {
            printf("TealDoc\n");
        } else {
            printf("PalmDoc\n");
        }
    } else {
        printf("Mobi version: %zu", mobi_get_fileversion(m));
        if (mobi_is_hybrid(m)) {
            size_t version = mobi_get_fileversion(m->next);
            if (version != MOBI_NOTSET) {
                printf(" (hybrid with version %zu)", version);
            }
        }
        printf("\n");
    }
    if (mobi_is_replica(m)) {
        printf("Print Replica\n");
    }
    if (mobi_is_encrypted(m)) {
        printf("Document is encrypted\n");
    }
    if (is_calibre) {
        printf("Creator software: calibre %u.%u.%u\n", major, minor, build);
    } else {
        MOBIExthHeader *exth = mobi_get_exthrecord_by_tag(m, EXTH_CREATORSOFT);
        if (exth) {
            printf("Creator software: ");
            uint32_t creator = mobi_decode_exthvalue(exth->data, exth->size);
            exth = mobi_get_exthrecord_by_tag(m, EXTH_CREATORMAJOR);
            if (exth) {
                major = mobi_decode_exthvalue(exth->data, exth->size);
            }
            exth = mobi_get_exthrecord_by_tag(m, EXTH_CREATORMINOR);
            if (exth) {
                minor = mobi_decode_exthvalue(exth->data, exth->size);
            }
            exth = mobi_get_exthrecord_by_tag(m, EXTH_CREATORBUILD);
            if (exth) {
                build = mobi_decode_exthvalue(exth->data, exth->size);
            }
            exth = mobi_get_exthrecord_by_tag(m, EXTH_CREATORBUILDREV);
            if (major == 2 && minor == 9 && build == 0 && exth) {
                char *rev = mobi_decode_exthstring(m, exth->data, exth->size);
                if (rev) {
                    if (strcmp(rev, "0730-890adc2") == 0) {
                        is_calibre = true;
                    }
                    free(rev);
                }
            }
            switch (creator) {
                case 0:
                    printf("mobipocket reader %u.%u.%u", major, minor, build);
                    break;
                case 1:
                case 101:
                    printf("mobigen %u.%u.%u", major, minor, build);
                    break;
                case 2:
                    printf("mobipocket creator %u.%u.%u", major, minor, build);
                    break;
                case 200:
                    printf("kindlegen %u.%u.%u (windows)", major, minor, build);
                    if (is_calibre) {
                        printf(" or calibre");
                    }
                    break;
                case 201:
                    printf("kindlegen %u.%u.%u (linux)", major, minor, build);
                    if ((major == 1 && minor == 2 && build == 33307) ||
                        (major == 2 && minor == 0 && build == 101) ||
                        is_calibre) {
                        printf(" or calibre");
                    }
                    break;
                case 202:
                    printf("kindlegen %u.%u.%u (mac)", major, minor, build);
                    if (is_calibre) {
                        printf(" or calibre");
                    }
                    break;
                default:
                    printf("unknown");
                    break;
            }
            printf("\n");
        }
    }
}
 
void print_exth(const MOBIData *m) {
    if (m->eh == NULL) {
        return;
    }
    /* Linked list of MOBIExthHeader structures holds EXTH records */
    const MOBIExthHeader *curr = m->eh;
    if (curr != NULL) {
        printf("\nEXTH records:\n");
    }
    uint32_t val32;
    while (curr != NULL) {
        /* check if it is a known tag and get some more info if it is */
        MOBIExthMeta tag = mobi_get_exthtagmeta_by_tag(curr->tag);
        if (tag.tag == 0) {
            /* unknown tag */
            /* try to print the record both as string and numeric value */
            char *str = malloc(curr->size + 1);
            if (!str) {
                printf("Memory allocation failed\n");
                exit(1);
            }
            unsigned i = 0;
            unsigned char *p = curr->data;
            while (i < curr->size && isprint(*p)) {
                str[i] = (char)*p++;
                i++;
            }
            str[i] = '\0';
            val32 = mobi_decode_exthvalue(curr->data, curr->size);
            printf("Unknown (%i): %s (%u)\n", curr->tag, str, val32);
            free(str);
        } else {
            /* known tag */
            size_t size = curr->size;
            unsigned char *data = curr->data;
            switch (tag.type) {
                    /* numeric */
                case EXTH_NUMERIC:
                    val32 = mobi_decode_exthvalue(data, size);
                    printf("%s (%i): %u\n", tag.name, tag.tag, val32);
                    break;
                    /* string */
                case EXTH_STRING:
                {
                    char *exth_string = mobi_decode_exthstring(m, data, size);
                    if (exth_string) {
                        printf("%s (%i): %s\n", tag.name, tag.tag, exth_string);
                        free(exth_string);
                    }
                    break;
                }
                    /* binary */
                case EXTH_BINARY:
                {
                    unsigned i = 0;
                    const size_t str_len = 2 * size + 1;
                    char *str = malloc(str_len);
                    if (!str) {
                        printf("Memory allocation failed\n");
                        exit(1);
                    }
                    str[0] = '\0';
                    while (size) {
                        uint8_t val8 = *data++;
                        snprintf(&str[i], str_len - i, "%02x", val8);
                        i += 2;
                        size--;
                    }
                    printf("%s (%i): 0x%s\n", tag.name, tag.tag, str);
                    free(str);
                    break;
                }
                default:
                    break;
            }
        }
        curr = curr->next;
    }
}
 
int set_decryption_pid(MOBIData *m, const char *pid) {
    printf("\nVerifying PID %s...", pid);
    MOBI_RET mobi_ret = mobi_drm_setkey(m, pid);
    if (mobi_ret != MOBI_SUCCESS) {
        printf("failed (%s)\n", libmobi_msg(mobi_ret));
        return (int) mobi_ret;
    }
    printf("ok\n");
    return SUCCESS;
}
 
int set_decryption_serial(MOBIData *m, const char *serial) {
    printf("\nVerifying serial %s... ", serial);
    MOBI_RET mobi_ret = mobi_drm_setkey_serial(m, serial);
    if (mobi_ret != MOBI_SUCCESS) {
        printf("failed (%s)\n", libmobi_msg(mobi_ret));
        return (int) mobi_ret;
    }
    printf("ok\n");
    return SUCCESS;
}
 
int set_decryption_key(MOBIData *m, const char *serial, const char *pid) {
 
    if (!pid && !serial) {
        return SUCCESS;
    }
    if (!mobi_is_encrypted(m)) {
        printf("\nDocument is not encrypted, ignoring PID/serial\n");
        return SUCCESS;
    }
    if (m->rh && m->rh->encryption_type == MOBI_ENCRYPTION_V1) {
        printf("\nEncryption type 1, ignoring PID/serial\n");
        return SUCCESS;
    }
    int ret = SUCCESS;
    if (pid && (ret = set_decryption_pid(m, pid)) == SUCCESS) {
        return SUCCESS;
    }
    if (serial) {
        ret = set_decryption_serial(m, serial);
    }
    return ret;
}
 
int save_mobi(MOBIData *m, const char *fullpath, const char *suffix) {
    char outfile[FILENAME_MAX];
    char basename[FILENAME_MAX];
    char dirname[FILENAME_MAX];
    split_fullpath(fullpath, dirname, basename, FILENAME_MAX);
    const char *ext = (mobi_get_fileversion(m) >= 8) ? "azw3" : "mobi";
    int n;
    if (outdir_opt) {
        n = snprintf(outfile, sizeof(outfile), "%s%s-%s.%s", outdir, basename, suffix, ext);
    } else {
        n = snprintf(outfile, sizeof(outfile), "%s%s-%s.%s", dirname, basename, suffix, ext);
    }
    if (n < 0) {
        printf("Creating file name failed\n");
        return ERROR;
    }
    if ((size_t) n >= sizeof(outfile)) {
        printf("File name too long\n");
        return ERROR;
    }
    
    /* write */
    printf("Saving %s...\n", outfile);
    FILE *file_out = fopen(outfile, "wb");
    if (file_out == NULL) {
        int errsv = errno;
        printf("Error opening file: %s (%s)\n", outfile, strerror(errsv));
        return ERROR;
    }
    MOBI_RET mobi_ret = mobi_write_file(file_out, m);
    fclose(file_out);
    if (mobi_ret != MOBI_SUCCESS) {
        printf("Error writing file (%s)\n", libmobi_msg(mobi_ret));
        return ERROR;
    }
    return SUCCESS;
}