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zipfile.c
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zipfile.c
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/**
* @file zipfile.c
* SQLite extension module for mapping a ZIP file as a read-only
* SQLite virtual table plus some supporting SQLite functions.
*
* 2012 September 12
*
* The author disclaims copyright to this source code.
* In place of a legal notice, here is a blessing:
*
* May you do good and not evil.
* May you find forgiveness for yourself and forgive others.
* May you share freely, never taking more than you give.
*
********************************************************************
*/
#ifdef linux
#define _GNU_SOURCE
#endif
#ifdef STANDALONE
#include <sqlite3.h>
#else
#include <sqlite3ext.h>
static SQLITE_EXTENSION_INIT1
#endif
#if defined(_WIN32) || defined(_WIN64)
#include <windows.h>
#else
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <zlib.h>
#define ZIP_SIG_LEN 4
#define ZIP_LOCAL_HEADER_SIG 0x04034b50
#define ZIP_LOCAL_HEADER_FLAGS 6
#define ZIP_LOCAL_HEADER_LEN 30
#define ZIP_LOCAL_EXTRA_OFFS 28
#define ZIP_CENTRAL_HEADER_SIG 0x02014b50
#define ZIP_CENTRAL_HEADER_FLAGS 8
#define ZIP_CENTRAL_HEADER_LEN 46
#define ZIP_CENTRAL_COMPMETH_OFFS 10
#define ZIP_CENTRAL_MTIME_OFFS 12
#define ZIP_CENTRAL_MDATE_OFFS 14
#define ZIP_CENTRAL_CRC32_OFFS 16
#define ZIP_CENTRAL_COMPLEN_OFFS 20
#define ZIP_CENTRAL_UNCOMPLEN_OFFS 24
#define ZIP_CENTRAL_PATHLEN_OFFS 28
#define ZIP_CENTRAL_EXTRALEN_OFFS 30
#define ZIP_CENTRAL_COMMENTLEN_OFFS 32
#define ZIP_CENTRAL_LOCALHDR_OFFS 42
#define ZIP_CENTRAL_END_SIG 0x06054b50
#define ZIP_CENTRAL_END_LEN 22
#define ZIP_CENTRAL_ENTS_OFFS 8
#define ZIP_CENTRAL_DIRSTART_OFFS 16
#define ZIP_COMPMETH_STORED 0
#define ZIP_COMPMETH_DEFLATED 8
#define zip_read_int(p) \
((p)[0] | ((p)[1] << 8) | ((p)[2] << 16) | ((p)[3] << 24))
#define zip_read_short(p) \
((p)[0] | ((p)[1] << 8))
/**
* @typedef zip_file
* @struct zip_file
* Structure to implement ZIP file handle.
*/
typedef struct zip_file {
off_t length; /**< length of ZIP file */
unsigned char *data; /**< mmap()'ed ZIP file */
#if defined(_WIN32) || defined(_WIN64)
HANDLE h; /**< Windows file handle */
HANDLE mh; /**< Windows file mapping */
#endif
int nentries; /**< Number of directory entries */
unsigned char *entries[1]; /**< Pointer to first entry */
} zip_file;
/**
* @typedef zip_vtab
* @struct zip_vtab
* Structure to describe a ZIP virtual table.
*/
typedef struct zip_vtab {
sqlite3_vtab vtab; /**< SQLite virtual table */
sqlite3 *db; /**< Open database */
zip_file *zip; /**< ZIP file handle */
int sorted; /**< 1 = sorted by path, -1 = sorting, 0 = unsorted */
char tblname[1]; /**< Name, format "database"."table" */
} zip_vtab;
/**
* @typedef zip_cursor
* @struct zip_cursor
* Structure to describe ZIP virtual table cursor.
*/
typedef struct {
sqlite3_vtab_cursor cursor; /**< SQLite virtual table cursor */
int pos; /**< ZIP file position */
int nmatches; /**< For filter EQ */
int *matches; /**< For filter EQ */
} zip_cursor;
#ifdef SQLITE_OPEN_URI
/**
* @typedef mem_blk
* @struct mem_blk
* Structure to describe in-core SQLite database read from BLOB.
*/
typedef struct mem_blk {
#define MEM_MAGIC "MVFS"
char magic[4]; /**< magic number */
int opened; /**< open counter */
#if defined(_WIN32) || defined(_WIN64)
HANDLE mh; /**< handle for memory mapping */
#else
long psize; /**< page size */
#ifdef linux
sqlite3_mutex *mutex; /**< mutex to protect mapping */
int lcnt; /**< lock counter */
#endif
#endif
unsigned long size; /**< size of memory mapped area */
unsigned long length; /**< real length of data area */
unsigned char *data; /**< data area */
} mem_blk;
/**
* @typedef mem_file
* @struct mem_file
* SQLite3 file structure enhanced by mem_blk.
*/
typedef struct mem_file {
sqlite3_file base; /**< sqlite3_file base structure */
#ifdef linux
int lock; /**< lock state */
#endif
mem_blk *mb; /**< pointer to memory block */
} mem_file;
/*
* Private VFS name
*/
static char mem_vfs_name[64];
#endif /* SQLITE_OPEN_URI */
/**
* Memory map ZIP file for reading and return handle to it.
* @param filename name of ZIP file
* @result ZIP file handle
*/
static zip_file *
zip_open(const char *filename)
{
#if defined(_WIN32) || defined(_WIN64)
HANDLE h, mh = INVALID_HANDLE_VALUE;
DWORD n, length;
unsigned char *data = 0;
#else
int fd;
off_t length;
unsigned char *data = MAP_FAILED;
#endif
int nentries, i;
zip_file *zip = 0;
unsigned char *p, *q, magic[ZIP_SIG_LEN];
if (!filename) {
return 0;
}
#if defined(_WIN32) || defined(_WIN64)
h = CreateFile(filename, GENERIC_READ, 0, 0, OPEN_EXISTING, 0, 0);
if (h == INVALID_HANDLE_VALUE) {
goto error;
}
if (!ReadFile(h, magic, sizeof (magic), &n, 0) ||
(n != sizeof (magic))) {
goto error;
}
if (zip_read_int(magic) != ZIP_LOCAL_HEADER_SIG) {
goto error;
}
length = GetFileSize(h, 0);
if ((length == INVALID_FILE_SIZE) || (length < ZIP_CENTRAL_END_LEN)) {
goto error;
}
mh = CreateFileMapping(h, 0, PAGE_READONLY, 0, length, 0);
if (mh == INVALID_HANDLE_VALUE) {
goto error;
}
data = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, length);
if (!data) {
goto error;
}
#else
fd = open(filename, O_RDONLY);
if (fd < 0) {
goto error;
}
if (read(fd, magic, ZIP_SIG_LEN) != ZIP_SIG_LEN) {
goto error;
}
if (zip_read_int(magic) != ZIP_LOCAL_HEADER_SIG) {
goto error;
}
length = lseek(fd, 0, SEEK_END);
if ((length == -1) || (length < ZIP_CENTRAL_END_LEN)) {
goto error;
}
data = (unsigned char *) mmap(0, length, PROT_READ,
MAP_FILE | MAP_PRIVATE, fd, 0);
if (data == MAP_FAILED) {
goto error;
}
close(fd);
fd = -1;
#endif
p = data + length - ZIP_CENTRAL_END_LEN;
while (p >= data) {
if (*p == (ZIP_CENTRAL_END_SIG & 0xFF)) {
if (zip_read_int(p) == ZIP_CENTRAL_END_SIG) {
break;
}
p -= ZIP_SIG_LEN;
} else {
--p;
}
}
if (p < data) {
goto error;
}
nentries = zip_read_short(p + ZIP_CENTRAL_ENTS_OFFS);
if (nentries == 0) {
goto error;
}
p = data + zip_read_int(p + ZIP_CENTRAL_DIRSTART_OFFS);
q = p;
for (i = 0; i < nentries; i++) {
int pathlen, comlen, extra;
if ((q + ZIP_CENTRAL_HEADER_LEN) > (data + length)) {
goto error;
}
if (zip_read_int(q) != ZIP_CENTRAL_HEADER_SIG) {
goto error;
}
pathlen = zip_read_short(q + ZIP_CENTRAL_PATHLEN_OFFS);
comlen = zip_read_short(q + ZIP_CENTRAL_COMMENTLEN_OFFS);
extra = zip_read_short(q + ZIP_CENTRAL_EXTRALEN_OFFS);
q += pathlen + comlen + extra + ZIP_CENTRAL_HEADER_LEN;
}
zip = sqlite3_malloc(sizeof (zip_file) +
nentries * sizeof (unsigned char *));
if (!zip) {
goto error;
}
#if defined(_WIN32) || defined(_WIN64)
zip->h = zip->mh = INVALID_HANDLE_VALUE;
#endif
zip->length = length;
zip->data = data;
zip->nentries = nentries;
q = p;
for (i = 0; i < nentries; i++) {
int pathlen, comlen, extra;
if ((q + ZIP_CENTRAL_HEADER_LEN) > (data + length)) {
goto error;
}
if (zip_read_int(q) != ZIP_CENTRAL_HEADER_SIG) {
goto error;
}
zip->entries[i] = q;
pathlen = zip_read_short(q + ZIP_CENTRAL_PATHLEN_OFFS);
comlen = zip_read_short(q + ZIP_CENTRAL_COMMENTLEN_OFFS);
extra = zip_read_short(q + ZIP_CENTRAL_EXTRALEN_OFFS);
q += pathlen + comlen + extra + ZIP_CENTRAL_HEADER_LEN;
}
zip->entries[i] = 0;
#if defined(_WIN32) || defined(_WIN64)
zip->h = h;
zip->mh = mh;
#endif
return zip;
error:
if (zip) {
sqlite3_free(zip);
}
#if defined(_WIN32) || defined(_WIN64)
if (data) {
UnmapViewOfFile(data);
}
if (mh != INVALID_HANDLE_VALUE) {
CloseHandle(mh);
}
if (h != INVALID_HANDLE_VALUE) {
CloseHandle(h);
}
#else
if (data != MAP_FAILED) {
munmap(data, length);
}
if (fd >= 0) {
close(fd);
}
#endif
return 0;
}
/**
* Close ZIP file handle.
* @param zip ZIP file handle
*/
static void
zip_close(zip_file *zip)
{
if (zip) {
#if defined(_WIN32) || defined(_WIN64)
if (zip->data) {
UnmapViewOfFile(zip->data);
}
if (zip->mh != INVALID_HANDLE_VALUE) {
CloseHandle(zip->mh);
}
if (zip->h != INVALID_HANDLE_VALUE) {
CloseHandle(zip->h);
}
#else
if (zip->data) {
munmap(zip->data, zip->length);
}
#endif
zip->length = 0;
zip->data = 0;
zip->nentries = 0;
sqlite3_free(zip);
}
}
/**
* Strip off quotes given string.
* @param in string to be processed
* @result new string to be free'd with sqlite3_free()
*/
static char *
unquote(char const *in)
{
char c, *ret;
int i;
ret = sqlite3_malloc(strlen(in) + 1);
if (ret) {
c = in[0];
if ((c == '"') || (c == '\'')) {
i = strlen(in + 1);
if ((i > 0) && (in[i] == c)) {
strcpy(ret, in + 1);
ret[i - 1] = '\0';
return ret;
}
}
strcpy(ret, in);
}
return ret;
}
/**
* Connect to virtual table
* @param db SQLite database pointer
* @param aux user specific pointer (unused)
* @param argc argument count
* @param argv argument vector
* @param vtabp pointer receiving virtual table pointer
* @param errp pointer receiving error messag
* @result SQLite error code
*
* Argument vector contains:
*
* argv[0] - module name<br>
* argv[1] - database name<br>
* argv[2] - table name (virtual table)<br>
* argv[3] - filename of ZIP file<br>
*/
static int
zip_vtab_connect(sqlite3* db, void *aux, int argc, const char * const *argv,
sqlite3_vtab **vtabp, char **errp)
{
zip_file *zip = 0;
int rc = SQLITE_ERROR;
char *filename;
zip_vtab *vtab;
if (argc < 4) {
*errp = sqlite3_mprintf("input file name missing");
return SQLITE_ERROR;
}
filename = unquote(argv[3]);
if (filename) {
zip = zip_open(filename);
sqlite3_free(filename);
}
if (!zip) {
*errp = sqlite3_mprintf("unable to open input file");
return rc;
}
vtab = sqlite3_malloc(sizeof(zip_vtab) + 6 +
strlen(argv[1]) + strlen(argv[2]));
if (!vtab) {
zip_close(zip);
*errp = sqlite3_mprintf("out of memory");
return rc;
}
memset(vtab, 0, sizeof (*vtab));
strcpy(vtab->tblname, "\"");
strcat(vtab->tblname, argv[1]);
strcat(vtab->tblname, "\".\"");
strcat(vtab->tblname, argv[2]);
strcat(vtab->tblname, "\"");
vtab->db = db;
vtab->zip = zip;
rc = sqlite3_declare_vtab(db, "CREATE TABLE x(path, comp, mtime, "
"crc32, length, data, clength, cdata)");
if (rc != SQLITE_OK) {
zip_close(zip);
sqlite3_free(vtab);
*errp = sqlite3_mprintf("table definition failed (error %d)", rc);
return rc;
}
*vtabp = &vtab->vtab;
*errp = 0;
return SQLITE_OK;
}
/**
* Create virtual table
* @param db SQLite database pointer
* @param aux user specific pointer (unused)
* @param argc argument count
* @param argv argument vector
* @param vtabp pointer receiving virtual table pointer
* @param errp pointer receiving error messag
* @result SQLite error code
*/
static int
zip_vtab_create(sqlite3* db, void *aux, int argc,
const char *const *argv,
sqlite3_vtab **vtabp, char **errp)
{
return zip_vtab_connect(db, aux, argc, argv, vtabp, errp);
}
/**
* Disconnect virtual table.
* @param vtab virtual table pointer
* @result always SQLITE_OK
*/
static int
zip_vtab_disconnect(sqlite3_vtab *vtab)
{
zip_vtab *tab = (zip_vtab *) vtab;
zip_close(tab->zip);
sqlite3_free(tab);
return SQLITE_OK;
}
/**
* Destroy virtual table.
* @param vtab virtual table pointer
* @result always SQLITE_OK
*/
static int
zip_vtab_destroy(sqlite3_vtab *vtab)
{
return zip_vtab_disconnect(vtab);
}
/**
* Determines information for filter function according to constraints.
* @param vtab virtual table
* @param info index/constraint information
* @result SQLite error code
*/
static int
zip_vtab_bestindex(sqlite3_vtab *vtab, sqlite3_index_info *info)
{
zip_vtab *tab = (zip_vtab *) vtab;
int i;
info->idxNum = 0;
if (tab->sorted == 0) {
char *sql = 0;
unsigned char **entries = 0;
sqlite3_stmt *stmt = 0;
int rc, count, i;
size_t tmp;
/* perform sorting on 0th column (path, string) */
tab->sorted = -1;
entries = sqlite3_malloc(tab->zip->nentries * sizeof (entries));
sql = sqlite3_mprintf("SELECT rowid FROM %s ORDER BY path",
tab->tblname);
if (sql && entries) {
rc = sqlite3_prepare_v2(tab->db, sql, -1, &stmt, 0);
if ((rc == SQLITE_OK) && stmt) {
count = 0;
while (1) {
rc = sqlite3_step(stmt);
if (rc != SQLITE_ROW) {
break;
}
tmp = sqlite3_column_int(stmt, 0);
entries[count++] = (unsigned char *) tmp;
}
if ((rc == SQLITE_DONE) && (count == tab->zip->nentries)) {
for (i = 0; i < count; i++) {
tmp = (size_t) entries[i];
tmp = (size_t) tab->zip->entries[tmp];
entries[i] = (unsigned char *) tmp;
}
memcpy(tab->zip->entries, entries, i * sizeof (entries));
tab->sorted = 1;
}
}
}
if (stmt) {
sqlite3_finalize(stmt);
}
if (sql) {
sqlite3_free(sql);
}
if (entries) {
sqlite3_free(entries);
}
}
/* no optimization while table is being sorted or is unsorted */
if (tab->sorted != 1) {
return SQLITE_OK;
}
/* support EQ or simple MATCH constraint on 0th column (path) */
for (i = 0; i < info->nConstraint; i++) {
if (info->aConstraint[i].usable &&
(info->aConstraint[i].iColumn == 0)) {
if (info->aConstraint[i].op == SQLITE_INDEX_CONSTRAINT_EQ) {
info->idxNum = 1;
info->aConstraintUsage[i].argvIndex = 1;
info->aConstraintUsage[i].omit = 1;
info->estimatedCost = 1.0;
break;
} else if (info->aConstraint[i].op ==
SQLITE_INDEX_CONSTRAINT_MATCH) {
info->idxNum = 2;
info->aConstraintUsage[i].argvIndex = 1;
info->aConstraintUsage[i].omit = 1;
info->estimatedCost = 2.0;
break;
}
}
}
/* ORDER BY is ascending on 0th column (path) when table is sorted */
if (info->nOrderBy > 0) {
if ((info->aOrderBy[0].iColumn == 0) && !info->aOrderBy[0].desc) {
info->orderByConsumed = 1;
}
}
return SQLITE_OK;
}
/**
* Open virtual table and return cursor.
* @param vtab virtual table pointer
* @param cursorp pointer receiving cursor pointer
* @result SQLite error code
*/
static int
zip_vtab_open(sqlite3_vtab *vtab, sqlite3_vtab_cursor **cursorp)
{
zip_cursor *cur = sqlite3_malloc(sizeof(*cur));
if (!cur) {
return SQLITE_ERROR;
}
cur->cursor.pVtab = vtab;
cur->pos = -1;
cur->nmatches = 0;
cur->matches = 0;
*cursorp = &cur->cursor;
return SQLITE_OK;
}
/**
* Close virtual table cursor.
* @param cursor cursor pointer
* @result SQLite error code
*/
static int
zip_vtab_close(sqlite3_vtab_cursor *cursor)
{
zip_cursor *cur = (zip_cursor *) cursor;
if (cur->matches) {
sqlite3_free(cur->matches);
}
sqlite3_free(cur);
return SQLITE_OK;
}
/**
* Retrieve next row from virtual table cursor
* @param cursor virtual table cursor
* @result SQLite error code
*/
static int
zip_vtab_next(sqlite3_vtab_cursor *cursor)
{
zip_cursor *cur = (zip_cursor *) cursor;
if (cur->nmatches >= 0) {
cur->pos++;
}
return SQLITE_OK;
}
/**
* Filter function for virtual table.
* @param cursor virtual table cursor
* @param idxNum used for expression (1 -> EQ, 2 -> MATCH, 0 else)
* @param idxStr nod used
* @param argc number arguments (1 -> EQ/MATCH, 0 else)
* @param argv argument (nothing or RHS of filter expression)
* @result SQLite error code
*/
static int
zip_vtab_filter(sqlite3_vtab_cursor *cursor, int idxNum,
const char *idxStr, int argc, sqlite3_value **argv)
{
zip_cursor *cur = (zip_cursor *) cursor;
zip_vtab *tab = (zip_vtab *) cur->cursor.pVtab;
if (cur->matches) {
sqlite3_free(cur->matches);
cur->matches = 0;
}
cur->nmatches = 0;
/* if EQ or MATCH constraint is active, add match array to cursor */
if (idxNum && (argc > 0)) {
int i, k, d, found, leneq, len;
unsigned char *eq;
eq = (unsigned char *) sqlite3_value_text(argv[0]);
if (!eq) {
cur->nmatches = -1;
goto done;
}
if (idxNum > 1) {
unsigned char *p = (unsigned char *) strrchr((char *) eq, '*');
if (!p || (p[1] != '\0')) {
return SQLITE_ERROR;
}
leneq = p - eq;
} else {
leneq = sqlite3_value_bytes(argv[0]);
if (leneq == 0) {
cur->nmatches = -1;
goto done;
}
}
cur->matches = sqlite3_malloc(tab->zip->nentries * sizeof (int));
if (!cur->matches) {
return SQLITE_NOMEM;
}
memset(cur->matches, 0, tab->zip->nentries * sizeof (int));
for (k = found = 0; k < tab->zip->nentries; k++) {
len = zip_read_short(tab->zip->entries[k] +
ZIP_CENTRAL_PATHLEN_OFFS);
if (idxNum > 1) {
if (len < leneq) {
continue;
}
} else if (len != leneq) {
if (found) {
break;
}
continue;
}
d = memcmp(tab->zip->entries[k] + ZIP_CENTRAL_HEADER_LEN,
eq, leneq);
if (d == 0) {
found++;
cur->matches[k] = 1;
} else if (d > 0) {
break;
}
}
for (i = k = 0; i < tab->zip->nentries; i++) {
if (cur->matches[i]) {
cur->matches[k++] = i;
}
}
cur->nmatches = k;
}
done:
cur->pos = -1;
return zip_vtab_next(cursor);
}
/**
* Return end of table state of virtual table cursor
* @param cursor virtual table cursor
* @result true/false
*/
static int
zip_vtab_eof(sqlite3_vtab_cursor *cursor)
{
zip_cursor *cur = (zip_cursor *) cursor;
zip_vtab *tab = (zip_vtab *) cur->cursor.pVtab;
if (cur->nmatches < 0) {
return 1;
}
if (cur->nmatches) {
return cur->pos >= cur->nmatches;
}
return cur->pos >= tab->zip->nentries;
}
/**
* Return column data of virtual table.
* @param cursor virtual table cursor
* @param ctx SQLite function context
* @param n column index
* @result SQLite error code
*/
static int
zip_vtab_column(sqlite3_vtab_cursor *cursor, sqlite3_context *ctx, int n)
{
zip_cursor *cur = (zip_cursor *) cursor;
zip_vtab *tab = (zip_vtab *) cur->cursor.pVtab;
unsigned char *data = 0;
unsigned char *dest = 0;
int length;
if (cur->nmatches) {
int pos;
if ((cur->pos < 0) || (cur->pos >= cur->nmatches)) {
sqlite3_result_error(ctx, "out of bounds", -1);
return SQLITE_ERROR;
}
pos = cur->matches[cur->pos];
data = tab->zip->entries[pos];
} else {
if ((cur->pos < 0) || (cur->pos >= tab->zip->nentries)) {
sqlite3_result_error(ctx, "out of bounds", -1);
return SQLITE_ERROR;
}
data = tab->zip->entries[cur->pos];
}
switch (n) {
case 0: /* "path": pathname */
length = zip_read_short(data + ZIP_CENTRAL_PATHLEN_OFFS);
data += ZIP_CENTRAL_HEADER_LEN;
sqlite3_result_text(ctx, (char *) data, length, SQLITE_TRANSIENT);
return SQLITE_OK;
case 1: /* "comp": compression method */
length = zip_read_short(data + ZIP_CENTRAL_COMPMETH_OFFS);
sqlite3_result_int(ctx, length);
return SQLITE_OK;
case 2: /* "mtime": modification time/date */
{
int time = zip_read_short(data + ZIP_CENTRAL_MTIME_OFFS);
int date = zip_read_short(data + ZIP_CENTRAL_MDATE_OFFS);
char mtbuf[64];
sprintf(mtbuf, "%04d-%02d-%02d %02d:%02d:%02d",
(date >> 9) + 1980, (date >> 5) & 0xf, date & 0x1f,
time >> 11, (time >> 5) & 0x3f, (time & 0x1f) << 1);
sqlite3_result_text(ctx, mtbuf, -1, SQLITE_TRANSIENT);
return SQLITE_OK;
}
case 3: /* "crc32": CRC32 of uncompress data */
length = zip_read_int(data + ZIP_CENTRAL_CRC32_OFFS);
sqlite3_result_int(ctx, length);
return SQLITE_OK;
case 4: /* "length": uncompress length of data */
length = zip_read_int(data + ZIP_CENTRAL_UNCOMPLEN_OFFS);
sqlite3_result_int(ctx, length);
return SQLITE_OK;
case 5: /* "data": uncompressed data */
{
int clength, offs, extra, pathlen, cmeth;
offs = zip_read_int(data + ZIP_CENTRAL_LOCALHDR_OFFS);
if ((offs + ZIP_LOCAL_HEADER_LEN) > tab->zip->length) {
goto donull;
}
extra = zip_read_short(tab->zip->data +
offs + ZIP_LOCAL_EXTRA_OFFS);
pathlen = zip_read_short(data + ZIP_CENTRAL_PATHLEN_OFFS);
length = zip_read_int(data + ZIP_CENTRAL_UNCOMPLEN_OFFS);
clength = zip_read_int(data + ZIP_CENTRAL_COMPLEN_OFFS);
cmeth = zip_read_short(data + ZIP_CENTRAL_COMPMETH_OFFS);
offs += ZIP_LOCAL_HEADER_LEN + pathlen + extra;
if ((offs + clength) > tab->zip->length) {
goto donull;
}
data = tab->zip->data + offs;
if (cmeth == ZIP_COMPMETH_STORED) {
sqlite3_result_blob(ctx, data, clength, SQLITE_TRANSIENT);
return SQLITE_OK;
} else if (cmeth == ZIP_COMPMETH_DEFLATED) {
z_stream stream;
int err;
stream.zalloc = Z_NULL;
stream.zfree = Z_NULL;
stream.next_in = data;
stream.avail_in = clength;
stream.next_out = dest = sqlite3_malloc(length);
stream.avail_out = length;
stream.opaque = 0;
if (!dest) {
goto donull;
}
if (inflateInit2(&stream, -15) != Z_OK) {
goto donull;
}
err = inflate(&stream, Z_SYNC_FLUSH);
inflateEnd(&stream);
if ((err == Z_STREAM_END) ||
((err == Z_OK) && (stream.avail_in == 0))) {
sqlite3_result_blob(ctx, dest, length, sqlite3_free);
return SQLITE_OK;
}
}
donull:
if (dest) {
sqlite3_free(dest);
}
sqlite3_result_null(ctx);
return SQLITE_OK;
}
case 6: /* "clength": compressed length */
length = zip_read_int(data + ZIP_CENTRAL_COMPLEN_OFFS);
sqlite3_result_int(ctx, length);
return SQLITE_OK;
case 7: /* "cdata": raw data */
{
int clength, offs, extra, pathlen;
offs = zip_read_int(data + ZIP_CENTRAL_LOCALHDR_OFFS);
if ((offs + ZIP_LOCAL_HEADER_LEN) > tab->zip->length) {
goto donull;
}
extra = zip_read_short(tab->zip->data +
offs + ZIP_LOCAL_EXTRA_OFFS);
pathlen = zip_read_short(data + ZIP_CENTRAL_PATHLEN_OFFS);
length = zip_read_int(data + ZIP_CENTRAL_UNCOMPLEN_OFFS);
clength = zip_read_int(data + ZIP_CENTRAL_COMPLEN_OFFS);
offs += ZIP_LOCAL_HEADER_LEN + pathlen + extra;
if ((offs + clength) > tab->zip->length) {
goto donull;
}
data = tab->zip->data + offs;
sqlite3_result_blob(ctx, data, clength, SQLITE_TRANSIENT);
return SQLITE_OK;
}
}
sqlite3_result_error(ctx, "invalid column number", -1);
return SQLITE_ERROR;
}
/**
* Return current rowid of virtual table cursor
* @param cursor virtual table cursor
* @param rowidp value buffer to receive current rowid
* @result SQLite error code
*/
static int
zip_vtab_rowid(sqlite3_vtab_cursor *cursor, sqlite_int64 *rowidp)
{
zip_cursor *cur = (zip_cursor *) cursor;
if (cur->nmatches < 0) {
*rowidp = -1;
} else if ((cur->pos >= 0) && (cur->nmatches > 0)) {
*rowidp = cur->matches[cur->pos];
} else {
*rowidp = cur->pos;
}
return SQLITE_OK;
}
/**
* Internal MATCH function for virtual table.
* @param ctx SQLite function context
* @param argc number of arguments
* @param argv argument vector
*/
static void
zip_vtab_matchfunc(sqlite3_context *ctx, int argc, sqlite3_value **argv)
{
int ret = 0;
if (argc == 2) {
unsigned char *q = (unsigned char *) sqlite3_value_text(argv[0]);
unsigned char *p = (unsigned char *) sqlite3_value_text(argv[1]);
if (p && q) {
unsigned char *eq = (unsigned char *) strrchr((char *) q, '*');
int lenq, lenp;
if (eq && (eq[1] == '\0')) {
lenq = eq - q;
if (lenq) {
lenp = strlen((char *) p);
if ((lenp >= lenq) && !memcmp(p, q, lenq)) {
ret = 1;
}
}
}
}
}
sqlite3_result_int(ctx, ret);
}
/**
* Find overloaded function on virtual table.
* @param vtab virtual table
* @param narg number arguments
* @param name function name
* @param pfunc pointer to function (value return)
* @param parg pointer to function's argument (value return)
* @result 0 or 1
*/
static int
zip_vtab_findfunc(sqlite3_vtab *vtab, int narg, const char *name,
void (**pfunc)(sqlite3_context *, int, sqlite3_value **),
void **parg)
{
if ((narg == 2) && !strcmp(name, "match")) {
*pfunc = zip_vtab_matchfunc;
*parg = 0;
return 1;
}
return 0;
}
#if (SQLITE_VERSION_NUMBER > 3004000)
/**
* Rename virtual table.
* @param newname new name for table
* @result SQLite error code
*/
static int
zip_vtab_rename(sqlite3_vtab *vtab, const char *newname)