/* * This software is copyrighted as noted below. It may be freely copied, * modified, and redistributed, provided that the copyright notice is * preserved on all copies. * * There is no warranty or other guarantee of fitness for this software, * it is provided solely "as is". Bug reports or fixes may be sent * to the author, who may or may not act on them as he desires. * * You may not include this software in a program or other software product * without supplying the source, or without informing the end-user that the * source is available for no extra charge. * * If you modify this software, you should include a notice giving the * name of the person performing the modification, the date of modification, * and the reason for such modification. */ /* * rle_hdr.c - Functions to manipulate rle_hdr structures. * * Author: Spencer W. Thomas * EECS Dept. * University of Michigan * Date: Mon May 20 1991 * Copyright (c) 1991, University of Michigan */ #include #include "nstring.h" #include "mallocvar.h" #include "rle_config.h" #include "rle.h" void rle_names(rle_hdr * const hdrP, const char * const pgmname, const char * const fname, int const imgNum) { /*---------------------------------------------------------------------------- * Load program and file names into header. * Inputs: * hdrP: Header to modify. * pgmname: The program name. * fname: The file name. * imgNum: Number of the image within the file. * Outputs: * *hdrP: Modified header. -----------------------------------------------------------------------------*/ /* Algorithm: If values previously filled in (by testing is_init field), free them. Make copies of file name and program name, modifying file name for standard i/o. Set is_init field. */ const char * newFname; const char * newPgmname; /* Mark as filled in. */ hdrP->is_init = RLE_INIT_MAGIC; /* Default file name for stdin/stdout. */ if (!fname || streq(fname, "-") || strlen(fname) == 0) newFname = "Standard I/O"; else newFname = fname; if (pgmname) newPgmname = pgmname; else newPgmname = rle_dflt_hdr.cmd; /* Fill in with copies of the strings. */ if (hdrP->cmd != newPgmname) hdrP->cmd = pm_strdup(newPgmname); if (hdrP->file_name != newFname) hdrP->file_name = pm_strdup(newFname); hdrP->img_num = imgNum; } /* Used by rle_hdr_cp and rle_hdr_init to avoid recursion loops. */ static int noRecurse = 0; rle_hdr * rle_hdr_cp(rle_hdr * const fromHdrP, rle_hdr * const toHdrArgP) { /*---------------------------------------------------------------------------- * Make a "safe" copy of a rle_hdr structure. * Inputs: * *fromHdrP: Header to be copied. * Outputs: * *toHdrPd: Copy of from_hdr, with all memory referred to * by pointers copied. Also returned as function * value. If NULL, a static header is used. * Assumptions: * It is safe to call rle_hdr_init on *toHdrP. -----------------------------------------------------------------------------*/ /* Algorithm: Initialize *toHdrP, copy *fromHdrP to it, then copy the memory referred to by all non-null pointers. */ static rle_hdr dfltHdr; rle_hdr * toHdrP; const char * cmd; const char * file; unsigned int num; /* Save command, file name, and image number if already initialized. */ if (toHdrArgP && toHdrArgP->is_init == RLE_INIT_MAGIC) { cmd = toHdrArgP->cmd; file = toHdrArgP->file_name; num = toHdrArgP->img_num; } else { cmd = file = NULL; num = 0; } if (!noRecurse) { ++noRecurse; rle_hdr_init(toHdrArgP); --noRecurse; } toHdrP = toHdrArgP ? toHdrArgP : &dfltHdr; *toHdrP = *fromHdrP; if (toHdrP->bg_color) { unsigned int i; MALLOCARRAY(toHdrP->bg_color, toHdrP->ncolors); if (!toHdrP->bg_color) pm_error("Failed to allocate array for %u background colors", toHdrP->ncolors); for (i = 0; i < toHdrP->ncolors; ++i) toHdrP->bg_color[i] = fromHdrP->bg_color[i]; } if (toHdrP->cmap) { size_t const size = toHdrP->ncmap * (1 << toHdrP->cmaplen) * sizeof(rle_map); toHdrP->cmap = malloc(size); if (!toHdrP->cmap) pm_error("Failed to allocate memory for %u color maps " "of length %u", toHdrP->ncmap, 1 << toHdrP->cmaplen); memcpy(toHdrP->cmap, fromHdrP->cmap, size); } /* Only copy array of pointers, as the original comment memory * never gets overwritten. */ if (toHdrP->comments) { unsigned int size; const char ** cp; /* Count the comments. */ for (cp = toHdrP->comments, size = 0; *cp; ++cp) ++size; /* Check if there are really any comments. */ if (size > 0) { ++size; /* Copy the NULL pointer, too. */ size *= sizeof(char *); toHdrP->comments = malloc(size); if (!toHdrP->comments) pm_error("Failed to allocation %u bytes for comments", size); memcpy(toHdrP->comments, fromHdrP->comments, size); } else toHdrP->comments = NULL; /* Blow off empty comment list. */ } /* Restore the names to their original values. */ toHdrP->cmd = cmd; toHdrP->file_name = file; /* Lines above mean nothing much happens if cmd and file are != NULL. */ rle_names(toHdrP, toHdrP->cmd, toHdrP->file_name, num); return toHdrP; } void rle_hdr_clear(rle_hdr * const hdrP) { /*---------------------------------------------------------------------------- * Clear out the allocated memory pieces of a header. * * This routine is intended to be used internally by the library, to * clear a header before putting new data into it. It clears all the * fields that would be set by reading in a new image header. * Therefore, it does not clear the program and file names. * * Inputs: * hdrP: To be cleared. * Outputs: * *hdrP: After clearing. * Assumptions: * If is_init field is RLE_INIT_MAGIC, the header has been * properly initialized. This will fail every 2^(-32) times, on * average. -----------------------------------------------------------------------------*/ /* Algorithm: Free memory and set to zero all pointers, except program and file name. */ /* Try to free memory. Assume if is_init is properly set that this * header has been previously initialized, therefore it is safe to * free memory. */ if (hdrP && hdrP->is_init == RLE_INIT_MAGIC) { if (hdrP->bg_color ) free(hdrP->bg_color); hdrP->bg_color = NULL; if (hdrP->cmap ) free(hdrP->cmap); hdrP->cmap = NULL; /* Unfortunately, we don't know how to free the comment memory. */ if (hdrP->comments) free(hdrP->comments); hdrP->comments = NULL; } } rle_hdr * rle_hdr_init(rle_hdr * const hdrP) { /*---------------------------------------------------------------------------- * Initialize a rle_hdr structure. * Inputs: * hdrP: Header to be initialized. * Outputs: * *hdrP: Initialized header. * Assumptions: * If hdrP->is_init is RLE_INIT_MAGIC, the header has been * previously initialized. * If the_hdr is a copy of another rle_hdr structure, the copy * was made with rle_hdr_cp. -----------------------------------------------------------------------------*/ /* Algorithm: Fill in fields of rle_dflt_hdr that could not be set by the loader If the_hdr is rle_dflt_hdr, do nothing else Else: If hdrP is NULL, return a copy of rle_dflt_hdr in static storage If hdrP->is_init is RLE_INIT_MAGIC, free all memory pointed to by non-null pointers. If this is a recursive call to rle_hdr_init, clear *hdrP and return hdrP. Else make a copy of rle_dflt_hdr and return its address. Make the copy in static storage if hdrP is NULL, and in *hdrP otherwise. */ rle_hdr * retval; rle_dflt_hdr.rle_file = stdout; /* The rest of rle_dflt_hdr is set by the loader's data initialization */ if (hdrP == &rle_dflt_hdr) retval = hdrP; else { rle_hdr_clear(hdrP); /* Call rle_hdr_cp only if not called from there. */ if (!noRecurse) { ++noRecurse; retval = rle_hdr_cp(&rle_dflt_hdr, hdrP); --noRecurse; } else retval = hdrP; } return retval; }