/* * Copyright (c) 2007 Vreixo Formoso * Copyright (c) 2007 Mario Danic * * This file is part of the libisofs project; you can redistribute it and/or * modify it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. See COPYING file for details. */ #include "rockridge.h" #include "node.h" #include "ecma119_tree.h" #include "error.h" #include "writer.h" #include "messages.h" #include "image.h" #include static int susp_append(Ecma119Image *t, struct susp_info *susp, uint8_t *data) { susp->n_susp_fields++; susp->susp_fields = realloc(susp->susp_fields, sizeof(void*) * susp->n_susp_fields); if (susp->susp_fields == NULL) { return ISO_MEM_ERROR; } susp->susp_fields[susp->n_susp_fields - 1] = data; susp->suf_len += data[2]; return ISO_SUCCESS; } static int susp_append_ce(Ecma119Image *t, struct susp_info *susp, uint8_t *data) { susp->n_ce_susp_fields++; susp->ce_susp_fields = realloc(susp->ce_susp_fields, sizeof(void*) * susp->n_ce_susp_fields); if (susp->ce_susp_fields == NULL) { return ISO_MEM_ERROR; } susp->ce_susp_fields[susp->n_ce_susp_fields - 1] = data; susp->ce_len += data[2]; return ISO_SUCCESS; } static uid_t px_get_uid(Ecma119Image *t, Ecma119Node *n) { if (t->replace_uid) { return t->uid; } else { return n->node->uid; } } static uid_t px_get_gid(Ecma119Image *t, Ecma119Node *n) { if (t->replace_gid) { return t->gid; } else { return n->node->gid; } } static mode_t px_get_mode(Ecma119Image *t, Ecma119Node *n) { if ((n->type == ECMA119_DIR || n->type == ECMA119_PLACEHOLDER)) { if (t->replace_dir_mode) { return (n->node->mode & S_IFMT) | t->dir_mode; } } else { if (t->replace_file_mode) { return (n->node->mode & S_IFMT) | t->file_mode; } } return n->node->mode; } /** * Add a PX System Use Entry. The PX System Use Entry is used to add POSIX * file attributes, such as access permissions or user and group id, to a * ECMA 119 directory record. (RRIP, 4.1.1) */ static int rrip_add_PX(Ecma119Image *t, Ecma119Node *n, struct susp_info *susp) { uint8_t *PX = malloc(44); if (PX == NULL) { return ISO_MEM_ERROR; } PX[0] = 'P'; PX[1] = 'X'; PX[2] = 44; PX[3] = 1; iso_bb(&PX[4], px_get_mode(t, n), 4); iso_bb(&PX[12], n->nlink, 4); iso_bb(&PX[20], px_get_uid(t, n), 4); iso_bb(&PX[28], px_get_gid(t, n), 4); iso_bb(&PX[36], n->ino, 4); return susp_append(t, susp, PX); } /** * Add to the given tree node a TF System Use Entry, used to record some * time stamps related to the file (RRIP, 4.1.6). */ static int rrip_add_TF(Ecma119Image *t, Ecma119Node *n, struct susp_info *susp) { uint8_t *TF = malloc(5 + 3 * 7); if (TF == NULL) { return ISO_MEM_ERROR; } TF[0] = 'T'; TF[1] = 'F'; TF[2] = 5 + 3 * 7; TF[3] = 1; TF[4] = (1 << 1) | (1 << 2) | (1 << 3); iso_datetime_7(&TF[5], n->node->mtime); iso_datetime_7(&TF[12], n->node->atime); iso_datetime_7(&TF[19], n->node->ctime); return susp_append(t, susp, TF); } /** * Add a PL System Use Entry, used to record the location of the original * parent directory of a directory which has been relocated. * * This is special because it doesn't modify the susp fields of the directory * that gets passed to it; it modifies the susp fields of the ".." entry in * that directory. * * See RRIP, 4.1.5.2 for more details. */ static int rrip_add_PL(Ecma119Image *t, Ecma119Node *n, struct susp_info *susp) { uint8_t *PL; if (n->type != ECMA119_DIR || n->info.dir->real_parent == NULL) { /* should never occur */ return ISO_ERROR; } PL = malloc(12); if (PL == NULL) { return ISO_MEM_ERROR; } PL[0] = 'P'; PL[1] = 'L'; PL[2] = 12; PL[3] = 1; /* write the location of the real parent, already computed */ iso_bb(&PL[4], n->info.dir->real_parent->info.dir->block, 4); return susp_append(t, susp, PL); } /** * Add a RE System Use Entry to the given tree node. The purpose of the * this System Use Entry is to indicate to an RRIP-compliant receiving * system that the Directory Record in which an "RE" System Use Entry is * recorded has been relocated from another position in the original * Directory Hierarchy. * * See RRIP, 4.1.5.3 for more details. */ static int rrip_add_RE(Ecma119Image *t, Ecma119Node *n, struct susp_info *susp) { uint8_t *RE = malloc(4); if (RE == NULL) { return ISO_MEM_ERROR; } RE[0] = 'R'; RE[1] = 'E'; RE[2] = 4; RE[3] = 1; return susp_append(t, susp, RE); } /** * Add a PN System Use Entry to the given tree node. * The PN System Use Entry is used to store the device number, and it's * mandatory if the tree node corresponds to a character or block device. * * See RRIP, 4.1.2 for more details. */ static int rrip_add_PN(Ecma119Image *t, Ecma119Node *n, struct susp_info *susp) { IsoSpecial *node; uint8_t *PN; node = (IsoSpecial*)n->node; if (node->node.type != LIBISO_SPECIAL) { /* should never occur */ return ISO_ERROR; } PN = malloc(20); if (PN == NULL) { return ISO_MEM_ERROR; } PN[0] = 'P'; PN[1] = 'N'; PN[2] = 20; PN[3] = 1; iso_bb(&PN[4], node->dev >> 32, 4); iso_bb(&PN[12], node->dev & 0xffffffff, 4); return susp_append(t, susp, PN); } /** * Add to the given tree node a CL System Use Entry, that is used to record * the new location of a directory which has been relocated. * * See RRIP, 4.1.5.1 for more details. */ static int rrip_add_CL(Ecma119Image *t, Ecma119Node *n, struct susp_info *susp) { uint8_t *CL; if (n->type != ECMA119_PLACEHOLDER) { /* should never occur */ return ISO_ERROR; } CL = malloc(12); if (CL == NULL) { return ISO_MEM_ERROR; } CL[0] = 'C'; CL[1] = 'L'; CL[2] = 12; CL[3] = 1; iso_bb(&CL[4], n->info.real_me->info.dir->block, 4); return susp_append(t, susp, CL); } static char *get_rr_name(Ecma119Image *t, Ecma119Node *n) { int ret; char *name; if (!strcmp(t->input_charset, t->output_charset)) { /* no conversion needed */ return strdup(n->node->name); } ret = strconv(n->node->name, t->input_charset, t->output_charset, &name); if (ret < 0) { iso_msg_sorry(t->image->messenger, LIBISO_CHARSET_ERROR, "Charset conversion error. Can't convert %s from %s to %s", n->node->name, t->input_charset, t->output_charset); /* use the original name, it's the best we can do */ name = strdup(n->node->name); } return name; } /** * Add a NM System Use Entry to the given tree node. The purpose of this * System Use Entry is to store the content of an Alternate Name to support * POSIX-style or other names. * * See RRIP, 4.1.4 for more details. * * @param size * Length of the name to be included into the NM * @param flags * @param ce * Whether to add or not to CE */ static int rrip_add_NM(Ecma119Image *t, struct susp_info *susp, char *name, int size, int flags, int ce) { uint8_t *NM = malloc(size + 5); if (NM == NULL) { return ISO_MEM_ERROR; } NM[0] = 'N'; NM[1] = 'M'; NM[2] = size + 5; NM[3] = 1; NM[4] = flags; if (size) { memcpy(&NM[5], name, size); } if (ce) { return susp_append_ce(t, susp, NM); } else { return susp_append(t, susp, NM); } } /** * Add a new SL component (RRIP, 4.1.3.1) to a list of components. * * @param n * Number of components. It will be updated. * @param compos * Pointer to the list of components. * @param s * The component content * @param size * Size of the component content * @param fl * Flags * @return * 1 on success, < 0 on error */ static int rrip_SL_append_comp(size_t *n, uint8_t ***comps, char *s, int size, char fl) { uint8_t *comp = malloc(size + 2); if (comp == NULL) { return ISO_MEM_ERROR; } (*n)++; comp[0] = fl; comp[1] = size; *comps = realloc(*comps, (*n) * sizeof(void*)); if (*comps == NULL) { free(comp); return ISO_MEM_ERROR; } (*comps)[(*n) - 1] = comp; if (size) { memcpy(&comp[2], s, size); } return ISO_SUCCESS; } /** * Add a SL System Use Entry to the given tree node. This is used to store * the content of a symbolic link, and is mandatory if the tree node * indicates a symbolic link (RRIP, 4.1.3). * * @param comp * Components of the SL System Use Entry. If they don't fit in a single * SL, more than one SL will be added. * @param n * Number of components in comp * @param ce * Whether to add to a continuation area or system use field. */ static int rrip_add_SL(Ecma119Image *t, struct susp_info *susp, uint8_t **comp, size_t n, int ce) { int ret, i, j; int total_comp_len = 0; size_t pos, written = 0; uint8_t *SL; for (i = 0; i < n; i++) { total_comp_len += comp[i][1] + 2; if (total_comp_len > 250) { /* we need a new SL entry */ total_comp_len -= comp[i][1] + 2; SL = malloc(total_comp_len + 5); if (SL == NULL) { return ISO_MEM_ERROR; } SL[0] = 'S'; SL[1] = 'L'; SL[2] = total_comp_len + 5; SL[3] = 1; SL[4] = 1; /* CONTINUE */ pos = 5; for (j = written; j < i; j++) { memcpy(&SL[pos], comp[j], comp[j][1] + 2); pos += comp[j][1] + 2; } /* * In this case we are sure we're writting to CE. Check for * debug purposes */ if (ce == 0) { return ISO_ERROR; /* unexpected */ } ret = susp_append_ce(t, susp, SL); if (ret < 0) { return ret; } written = i; total_comp_len = comp[i][1] + 2; } } SL = malloc(total_comp_len + 5); if (SL == NULL) { return ISO_MEM_ERROR; } SL[0] = 'S'; SL[1] = 'L'; SL[2] = total_comp_len + 5; SL[3] = 1; SL[4] = 0; pos = 5; for (j = written; j < n; j++) { memcpy(&SL[pos], comp[j], comp[j][1] + 2); pos += comp[j][1] + 2; } if (ce) { ret = susp_append_ce(t, susp, SL); } else { ret = susp_append(t, susp, SL); } return ret; } /** * Add a SUSP "ER" System Use Entry to identify the Rock Ridge specification. * * The "ER" System Use Entry is used to uniquely identify a specification * compliant with SUSP. This method adds to the given tree node "." entry * the "ER" corresponding to the RR protocol. * * See SUSP, 5.5 and RRIP, 4.3 for more details. */ static int rrip_add_ER(Ecma119Image *t, struct susp_info *susp) { unsigned char *ER = malloc(182); if (ER == NULL) { return ISO_MEM_ERROR; } ER[0] = 'E'; ER[1] = 'R'; ER[2] = 182; ER[3] = 1; ER[4] = 9; ER[5] = 72; ER[6] = 93; ER[7] = 1; memcpy(&ER[8], "IEEE_1282", 9); memcpy(&ER[17], "THE IEEE 1282 PROTOCOL PROVIDES SUPPORT FOR POSIX " "FILE SYSTEM SEMANTICS.", 72); memcpy(&ER[89], "PLEASE CONTACT THE IEEE STANDARDS DEPARTMENT, " "PISCATAWAY, NJ, USA FOR THE 1282 SPECIFICATION.", 93); /** This always goes to continuation area */ return susp_append_ce(t, susp, ER); } /** * Add a CE System Use Entry to the given tree node. A "CE" is used to add * a continuation area, where additional System Use Entry can be written. * (SUSP, 5.1). */ static int susp_add_CE(Ecma119Image *t, size_t ce_len, struct susp_info *susp) { uint8_t *CE = malloc(28); if (CE == NULL) { return ISO_MEM_ERROR; } CE[0] = 'C'; CE[1] = 'E'; CE[2] = 28; CE[3] = 1; iso_bb(&CE[4], susp->ce_block, 4); iso_bb(&CE[12], susp->ce_len, 4); iso_bb(&CE[20], ce_len, 4); return susp_append(t, susp, CE); } /** * Add a SP System Use Entry. The SP provide an identifier that the SUSP is * used within the volume. The SP shall be recorded in the "." entry of the * root directory. See SUSP, 5.3 for more details. */ static int susp_add_SP(Ecma119Image *t, struct susp_info *susp) { unsigned char *SP = malloc(7); if (SP == NULL) { return ISO_MEM_ERROR; } SP[0] = 'S'; SP[1] = 'P'; SP[2] = (char)7; SP[3] = (char)1; SP[4] = 0xbe; SP[5] = 0xef; SP[6] = 0; return susp_append(t, susp, SP); } /** * Compute the length needed for write all RR and SUSP entries for a given * node. * * @param type * 0 normal entry, 1 "." entry for that node (it is a dir), 2 ".." * for that node (i.e., it will refer to the parent) * @param space * Available space in the System Use Area for the directory record. * @param ce * Will be filled with the space needed in a CE * @return * The size needed for the RR entries in the System Use Area */ size_t rrip_calc_len(Ecma119Image *t, Ecma119Node *n, int type, size_t space, size_t *ce) { size_t su_size; /* space min is 255 - 33 - 37 = 185 * At the same time, it is always an odd number, but we need to pad it * propertly to ensure the length of a directory record is a even number * (ECMA-119, 9.1.13). Thus, in fact the real space is always space - 1 */ space--; *ce = 0; /* PX and TF, we are sure they always fit in SUA */ su_size = 44 + 26; if (n->type == ECMA119_DIR) { if (n->info.dir->real_parent != NULL) { /* it is a reallocated entry */ if (type == 2) { /* we need to add a PL entry */ su_size += 12; } else if (type == 0) { /* we need to add a RE entry */ su_size += 4; } } } else if (n->type == ECMA119_SPECIAL) { if (S_ISBLK(n->node->mode) || S_ISCHR(n->node->mode)) { /* block or char device, we need a PN entry */ su_size += 20; } } else if (n->type == ECMA119_PLACEHOLDER) { /* we need the CL entry */ su_size += 12; } if (type == 0) { char *name = get_rr_name(t, n); size_t namelen = strlen(name); free(name); /* NM entry */ if (su_size + 5 + namelen <= space) { /* ok, it fits in System Use Area */ su_size += 5 + namelen; } else { /* the NM will be divided in a CE */ namelen = namelen - (space - su_size - 5 - 28); *ce = 5 + namelen; su_size = space; } if (n->type == ECMA119_SYMLINK) { /* * for symlinks, we also need to write the SL */ char *cur, *prev; size_t sl_len = 5; int cew = (*ce != 0); /* are we writing to CE? */ prev = ((IsoSymlink*)n->node)->dest; cur = strchr(prev, '/'); while (1) { size_t clen; if (cur) { clen = cur - prev; } else { /* last component */ clen = strlen(prev); } if (clen == 1 && prev[0] == '.') { clen = 0; } else if (clen == 2 && prev[0] == '.' && prev[1] == '.') { clen = 0; } /* flags and len for each component record (RRIP, 4.1.3.1) */ clen += 2; if (!cew) { /* we are still writing to the SUA */ if (su_size + sl_len + clen > space) { /* * ok, we need a Continuation Area anyway * TODO this can be handled better, but for now SL * will be completelly moved into the CA */ if (su_size + 28 <= space) { /* the CE entry fills without reducing NM */ su_size += 28; } else { /* we need to reduce NM */ *ce = (28 - (space - su_size)) + 5; su_size = space; } cew = 1; } else { sl_len += clen; } } if (cew) { if (sl_len + clen > 255) { /* we need an additional SL entry */ if (clen > 250) { /* * case 1, component too large to fit in a * single SL entry. Thus, the component need * to be divided anyway. * Note than clen can be up to 255 + 2 = 257. * * First, we check how many bytes fit in current * SL field */ int fit = 255 - sl_len - 2; if (clen - 250 <= fit) { /* * the component can be divided between this * and another SL entry */ *ce += 255; /* this SL, full */ sl_len = 5 + (clen - fit); } else { /* * the component will need a 2rd SL entry in * any case, so we prefer to don't write * anything in this SL */ *ce += sl_len + 255; sl_len = 5 + (clen - 250) + 2; } } else { /* case 2, create a new SL entry */ *ce += sl_len; sl_len = 5 + clen; } } else { sl_len += clen; } } if (!cur || cur[1] == '\0') { /* cur[1] can be \0 if dest ends with '/' */ break; } prev = cur + 1; cur = strchr(prev, '/'); } /* and finally write the pending SL field */ if (!cew) { /* the whole SL fits into the SUA */ su_size += sl_len; } else { *ce += sl_len; } } } else { /* "." or ".." entry */ su_size += 5; /* NM field */ if (type == 1 && n->parent == NULL) { /* * "." for root directory * we need to write SP and ER entries. The first fits in SUA, * ER needs a Continuation Area, thus we also need a CE entry */ su_size += 7 + 28; /* SP + CE */ *ce = 182; /* ER */ } } /* * The System Use field inside the directory record must be padded if * it is an odd number (ECMA-119, 9.1.13) */ su_size += (su_size % 2); return su_size; } /** * Free all info in a struct susp_info. */ static void susp_info_free(struct susp_info* susp) { size_t i; for (i = 0; i < susp->n_susp_fields; ++i) { free(susp->susp_fields[i]); } free(susp->susp_fields); for (i = 0; i < susp->n_ce_susp_fields; ++i) { free(susp->ce_susp_fields[i]); } free(susp->ce_susp_fields); } /** * Fill a struct susp_info with the RR/SUSP entries needed for a given * node. * * @param type * 0 normal entry, 1 "." entry for that node (it is a dir), 2 ".." * for that node (i.e., it will refer to the parent) * @param space * Available space in the System Use Area for the directory record. * @param info * Pointer to the struct susp_info where the entries will be stored. * If some entries need to go to a Continuation Area, they will be added * to the existing ce_susp_fields, and ce_len will be incremented * propertly. Please ensure ce_block is initialized propertly. * @return * 1 success, < 0 error */ int rrip_get_susp_fields(Ecma119Image *t, Ecma119Node *n, int type, size_t space, struct susp_info *info) { int ret; size_t i; Ecma119Node *node; char *name= NULL; if (t == NULL || n == NULL || info == NULL) { return ISO_NULL_POINTER; } if (type < 0 || type > 2 || space < 185) { /* space min is 255 - 33 - 37 = 185 */ return ISO_WRONG_ARG_VALUE; } if (type == 2 && n->parent != NULL) { node = n->parent; } else { node = n; } /* space min is 255 - 33 - 37 = 185 * At the same time, it is always an odd number, but we need to pad it * propertly to ensure the length of a directory record is a even number * (ECMA-119, 9.1.13). Thus, in fact the real space is always space - 1 */ space--; /* * SP must be the first entry for the "." record of the root directory * (SUSP, 5.3) */ if (type == 1 && n->parent == NULL) { ret = susp_add_SP(t, info); if (ret < 0) { goto add_susp_cleanup; } } /* PX and TF, we are sure they always fit in SUA */ ret = rrip_add_PX(t, node, info); if (ret < 0) { goto add_susp_cleanup; } ret = rrip_add_TF(t, node, info); if (ret < 0) { goto add_susp_cleanup; } if (n->type == ECMA119_DIR) { if (n->info.dir->real_parent != NULL) { /* it is a reallocated entry */ if (type == 2) { /* * we need to add a PL entry * Note that we pass "n" as parameter, not "node" */ ret = rrip_add_PL(t, n, info); if (ret < 0) { goto add_susp_cleanup; } } else if (type == 0) { /* we need to add a RE entry */ ret = rrip_add_RE(t, node, info); if (ret < 0) { goto add_susp_cleanup; } } } } else if (n->type == ECMA119_SPECIAL) { if (S_ISBLK(n->node->mode) || S_ISCHR(n->node->mode)) { /* block or char device, we need a PN entry */ ret = rrip_add_PN(t, node, info); if (ret < 0) { goto add_susp_cleanup; } } } else if (n->type == ECMA119_PLACEHOLDER) { /* we need the CL entry */ ret = rrip_add_CL(t, node, info); if (ret < 0) { goto add_susp_cleanup; } } if (type == 0) { size_t sua_free; /* free space in the SUA */ int nm_type = 0; /* 0 whole entry in SUA, 1 part in CE */ size_t ce_len = 0; /* len of the CE */ size_t namelen; /* this two are only defined for symlinks */ uint8_t **comps= NULL; /* components of the SL field */ size_t n_comp = 0; /* number of components */ name = get_rr_name(t, n); namelen = strlen(name); sua_free = space - info->suf_len; /* NM entry */ if (5 + namelen <= sua_free) { /* ok, it fits in System Use Area */ sua_free -= (5 + namelen); nm_type = 0; } else { /* the NM will be divided in a CE */ nm_type = 1; namelen = namelen - (sua_free - 5 - 28); ce_len = 5 + namelen; sua_free = 0; } if (n->type == ECMA119_SYMLINK) { /* * for symlinks, we also need to write the SL */ char *cur, *prev; size_t sl_len = 5; int cew = (nm_type == 1); /* are we writing to CE? */ prev = ((IsoSymlink*)n->node)->dest; cur = strchr(prev, '/'); while (1) { size_t clen; char cflag = 0; /* component flag (RRIP, 4.1.3.1) */ if (cur) { clen = cur - prev; } else { /* last component */ clen = strlen(prev); } if (clen == 0) { /* this refers to the roor directory, '/' */ cflag = 1 << 3; } if (clen == 1 && prev[0] == '.') { clen = 0; cflag = 1 << 1; } else if (clen == 2 && prev[0] == '.' && prev[1] == '.') { clen = 0; cflag = 1 << 2; } /* flags and len for each component record (RRIP, 4.1.3.1) */ clen += 2; if (!cew) { /* we are still writing to the SUA */ if (sl_len + clen > sua_free) { /* * ok, we need a Continuation Area anyway * TODO this can be handled better, but for now SL * will be completelly moved into the CA */ if (28 <= sua_free) { /* the CE entry fills without reducing NM */ sua_free -= 28; cew = 1; } else { /* we need to reduce NM */ nm_type = 1; ce_len = (28 - sua_free) + 5; sua_free = 0; cew = 1; } } else { /* add the component */ ret = rrip_SL_append_comp(&n_comp, &comps, prev, clen - 2, cflag); if (ret < 0) { goto add_susp_cleanup; } sl_len += clen; } } if (cew) { if (sl_len + clen > 255) { /* we need an addition SL entry */ if (clen > 250) { /* * case 1, component too large to fit in a * single SL entry. Thus, the component need * to be divided anyway. * Note than clen can be up to 255 + 2 = 257. * * First, we check how many bytes fit in current * SL field */ int fit = 255 - sl_len - 2; if (clen - 250 <= fit) { /* * the component can be divided between this * and another SL entry */ ret = rrip_SL_append_comp(&n_comp, &comps, prev, fit, 0x01); if (ret < 0) { goto add_susp_cleanup; } /* * and another component, that will go in * other SL entry */ ret = rrip_SL_append_comp(&n_comp, &comps, prev + fit, clen - fit - 2, 0); if (ret < 0) { goto add_susp_cleanup; } ce_len += 255; /* this SL, full */ sl_len = 5 + (clen - fit); } else { /* * the component will need a 2rd SL entry in * any case, so we prefer to don't write * anything in this SL */ ret = rrip_SL_append_comp(&n_comp, &comps, prev, 248, 0x01); if (ret < 0) { goto add_susp_cleanup; } ret = rrip_SL_append_comp(&n_comp, &comps, prev + 248, strlen(prev + 248), 0x00); if (ret < 0) { goto add_susp_cleanup; } ce_len += sl_len + 255; sl_len = 5 + (clen - 250) + 2; } } else { /* case 2, create a new SL entry */ ret = rrip_SL_append_comp(&n_comp, &comps, prev, clen - 2, cflag); if (ret < 0) { goto add_susp_cleanup; } ce_len += sl_len; sl_len = 5 + clen; } } else { /* the component fit in the SL entry */ ret = rrip_SL_append_comp(&n_comp, &comps, prev, clen - 2, cflag); if (ret < 0) { goto add_susp_cleanup; } sl_len += clen; } } if (!cur || cur[1] == '\0') { /* cur[1] can be \0 if dest ends with '/' */ break; } prev = cur + 1; cur = strchr(prev, '/'); } if (cew) { ce_len += sl_len; } } /* * We we reach here: * - We know if NM fill in the SUA (nm_type == 0) * - If SL needs an to be written in CE (ce_len > 0) * - The components for SL entry (or entries) */ if (nm_type == 0) { /* the full NM fills in SUA */ ret = rrip_add_NM(t, info, name, strlen(name), 0, 0); if (ret < 0) { goto add_susp_cleanup; } } else { /* * Write the NM part that fits in SUA... Note that CE * entry and NM in the continuation area is added below */ namelen = space - info->suf_len - 28 - 5; ret = rrip_add_NM(t, info, name, namelen, 1, 0); if (ret < 0) { goto add_susp_cleanup; } } if (ce_len > 0) { /* Add the CE entry */ ret = susp_add_CE(t, ce_len, info); if (ret < 0) { goto add_susp_cleanup; } } if (nm_type == 1) { /* * ..and the part that goes to continuation area. */ ret = rrip_add_NM(t, info, name + namelen, strlen(name + namelen), 0, 1); if (ret < 0) { goto add_susp_cleanup; } } if (n->type == ECMA119_SYMLINK) { /* add the SL entry (or entries) */ ret = rrip_add_SL(t, info, comps, n_comp, (ce_len > 0)); /* free the components */ for (i = 0; i < n_comp; i++) { free(comps[i]); } free(comps); if (ret < 0) { goto add_susp_cleanup; } } } else { /* "." or ".." entry */ /* write the NM entry */ ret = rrip_add_NM(t, info, NULL, 0, 1 << type, 0); if (ret < 0) { goto add_susp_cleanup; } if (type == 1 && n->parent == NULL) { /* * "." for root directory * we need to write SP and ER entries. The first fits in SUA, * ER needs a Continuation Area, thus we also need a CE entry. * Note that SP entry was already added above */ ret = susp_add_CE(t, 182, info); /* 182 is ER length */ if (ret < 0) { goto add_susp_cleanup; } ret = rrip_add_ER(t, info); if (ret < 0) { goto add_susp_cleanup; } } } /* * The System Use field inside the directory record must be padded if * it is an odd number (ECMA-119, 9.1.13) */ info->suf_len += (info->suf_len % 2); free(name); return ISO_SUCCESS; add_susp_cleanup: ; free(name); susp_info_free(info); return ret; } /** * Write the given SUSP fields into buf. Note that Continuation Area * fields are not written. * If info does not contain any SUSP entry this function just return. * After written, the info susp_fields array will be freed, and the counters * updated propertly. */ void rrip_write_susp_fields(Ecma119Image *t, struct susp_info *info, uint8_t *buf) { size_t i; size_t pos = 0; if (info->n_susp_fields == 0) { return; } for (i = 0; i < info->n_susp_fields; i++) { memcpy(buf + pos, info->susp_fields[i], info->susp_fields[i][2]); pos += info->susp_fields[i][2]; } /* free susp_fields */ for (i = 0; i < info->n_susp_fields; ++i) { free(info->susp_fields[i]); } free(info->susp_fields); info->susp_fields = NULL; info->n_susp_fields = 0; info->suf_len = 0; } /** * Write the Continuation Area entries for the given struct susp_info, using * the iso_write() function. * After written, the ce_susp_fields array will be freed. */ int rrip_write_ce_fields(Ecma119Image *t, struct susp_info *info) { size_t i; uint8_t padding[BLOCK_SIZE]; int ret= ISO_SUCCESS; if (info->n_ce_susp_fields == 0) { return ret; } for (i = 0; i < info->n_ce_susp_fields; i++) { ret = iso_write(t, info->ce_susp_fields[i], info->ce_susp_fields[i][2]); if (ret < 0) { goto write_ce_field_cleanup; } } /* pad continuation area until block size */ i = BLOCK_SIZE - (info->ce_len % BLOCK_SIZE); if (i > 0 && i < BLOCK_SIZE) { memset(padding, 0, i); ret = iso_write(t, padding, i); } write_ce_field_cleanup: ; /* free ce_susp_fields */ for (i = 0; i < info->n_ce_susp_fields; ++i) { free(info->ce_susp_fields[i]); } free(info->ce_susp_fields); info->ce_susp_fields = NULL; info->n_ce_susp_fields = 0; info->ce_len = 0; return ret; }