/* This file is part of libmspack. * (C) 2003-2004 Stuart Caie. * * libmspack is free software; you can redistribute it and/or modify it under * the terms of the GNU Lesser General Public License (LGPL) version 2.1 * * For further details, see the file COPYING.LIB distributed with libmspack */ #ifdef HAVE_CONFIG_H # include #endif #include #if !LARGEFILE_SUPPORT const char *largefile_msg = "library not compiled to support large files."; #endif int mspack_version(int entity) { switch (entity) { /* CHM decoder version 1 -> 2 changes: * - added mschmd_sec_mscompressed::spaninfo * - added mschmd_header::first_pmgl * - added mschmd_header::last_pmgl * - added mschmd_header::chunk_cache; */ case MSPACK_VER_MSCHMD: /* CAB decoder version 1 -> 2 changes: * - added MSCABD_PARAM_SALVAGE */ case MSPACK_VER_MSCABD: return 2; case MSPACK_VER_LIBRARY: case MSPACK_VER_SYSTEM: case MSPACK_VER_MSSZDDD: case MSPACK_VER_MSKWAJD: case MSPACK_VER_MSOABD: return 1; case MSPACK_VER_MSCABC: case MSPACK_VER_MSCHMC: case MSPACK_VER_MSLITD: case MSPACK_VER_MSLITC: case MSPACK_VER_MSHLPD: case MSPACK_VER_MSHLPC: case MSPACK_VER_MSSZDDC: case MSPACK_VER_MSKWAJC: case MSPACK_VER_MSOABC: return 0; } return -1; } int mspack_sys_selftest_internal(int offt_size) { return (sizeof(off_t) == offt_size) ? MSPACK_ERR_OK : MSPACK_ERR_SEEK; } /* validates a system structure */ int mspack_valid_system(struct mspack_system *sys) { return (sys != NULL) && (sys->open != NULL) && (sys->close != NULL) && (sys->read != NULL) && (sys->write != NULL) && (sys->seek != NULL) && (sys->tell != NULL) && (sys->message != NULL) && (sys->alloc != NULL) && (sys->free != NULL) && (sys->copy != NULL) && (sys->null_ptr == NULL); } /* returns the length of a file opened for reading */ int mspack_sys_filelen(struct mspack_system *system, struct mspack_file *file, off_t *length) { off_t current; if (!system || !file || !length) return MSPACK_ERR_OPEN; /* get current offset */ current = system->tell(file); /* seek to end of file */ if (system->seek(file, (off_t) 0, MSPACK_SYS_SEEK_END)) { return MSPACK_ERR_SEEK; } /* get offset of end of file */ *length = system->tell(file); /* seek back to original offset */ if (system->seek(file, current, MSPACK_SYS_SEEK_START)) { return MSPACK_ERR_SEEK; } return MSPACK_ERR_OK; } /* definition of mspack_default_system -- if the library is compiled with * MSPACK_NO_DEFAULT_SYSTEM, no default system will be provided. Otherwise, * an appropriate default system (e.g. the standard C library, or some native * API calls) */ #ifdef MSPACK_NO_DEFAULT_SYSTEM struct mspack_system *mspack_default_system = NULL; #else /* implementation of mspack_default_system for standard C library */ #include #include #include #include struct mspack_file_p { FILE *fh; const char *name; }; static struct mspack_file *msp_open(struct mspack_system *self, const char *filename, int mode) { struct mspack_file_p *fh; const char *fmode; switch (mode) { case MSPACK_SYS_OPEN_READ: fmode = "rb"; break; case MSPACK_SYS_OPEN_WRITE: fmode = "wb"; break; case MSPACK_SYS_OPEN_UPDATE: fmode = "r+b"; break; case MSPACK_SYS_OPEN_APPEND: fmode = "ab"; break; default: return NULL; } if ((fh = (struct mspack_file_p *) malloc(sizeof(struct mspack_file_p)))) { fh->name = filename; if ((fh->fh = fopen(filename, fmode))) return (struct mspack_file *) fh; free(fh); } return NULL; } static void msp_close(struct mspack_file *file) { struct mspack_file_p *self = (struct mspack_file_p *) file; if (self) { fclose(self->fh); free(self); } } static int msp_read(struct mspack_file *file, void *buffer, int bytes) { struct mspack_file_p *self = (struct mspack_file_p *) file; if (self && buffer && bytes >= 0) { size_t count = fread(buffer, 1, (size_t) bytes, self->fh); if (!ferror(self->fh)) return (int) count; } return -1; } static int msp_write(struct mspack_file *file, void *buffer, int bytes) { struct mspack_file_p *self = (struct mspack_file_p *) file; if (self && buffer && bytes >= 0) { size_t count = fwrite(buffer, 1, (size_t) bytes, self->fh); if (!ferror(self->fh)) return (int) count; } return -1; } static int msp_seek(struct mspack_file *file, off_t offset, int mode) { struct mspack_file_p *self = (struct mspack_file_p *) file; if (self) { switch (mode) { case MSPACK_SYS_SEEK_START: mode = SEEK_SET; break; case MSPACK_SYS_SEEK_CUR: mode = SEEK_CUR; break; case MSPACK_SYS_SEEK_END: mode = SEEK_END; break; default: return -1; } #if HAVE_FSEEKO return fseeko(self->fh, offset, mode); #else return fseek(self->fh, offset, mode); #endif } return -1; } static off_t msp_tell(struct mspack_file *file) { struct mspack_file_p *self = (struct mspack_file_p *) file; #if HAVE_FSEEKO return (self) ? (off_t) ftello(self->fh) : 0; #else return (self) ? (off_t) ftell(self->fh) : 0; #endif } static void msp_msg(struct mspack_file *file, const char *format, ...) { va_list ap; if (file) fprintf(stderr, "%s: ", ((struct mspack_file_p *) file)->name); va_start(ap, format); vfprintf(stderr, format, ap); va_end(ap); fputc((int) '\n', stderr); fflush(stderr); } static void *msp_alloc(struct mspack_system *self, size_t bytes) { #if DEBUG /* make uninitialised data obvious */ char *buf = malloc(bytes + 8); if (buf) memset(buf, 0xDC, bytes); *((size_t *)buf) = bytes; return &buf[8]; #else return malloc(bytes); #endif } static void msp_free(void *buffer) { #if DEBUG char *buf = buffer; size_t bytes; if (buf) { buf -= 8; bytes = *((size_t *)buf); /* make freed data obvious */ memset(buf, 0xED, bytes); free(buf); } #else free(buffer); #endif } static void msp_copy(void *src, void *dest, size_t bytes) { memcpy(dest, src, bytes); } static struct mspack_system msp_system = { &msp_open, &msp_close, &msp_read, &msp_write, &msp_seek, &msp_tell, &msp_msg, &msp_alloc, &msp_free, &msp_copy, NULL }; struct mspack_system *mspack_default_system = &msp_system; #endif