/*---------------------------------------------------------------------------- libpam.c ------------------------------------------------------------------------------ These are the library functions, which belong in the libnetpbm library, that deal with the PAM (Portable Arbitrary Format) image format. -----------------------------------------------------------------------------*/ /* See pmfileio.c for the complicated explanation of this 32/64 bit file offset stuff. */ #define _FILE_OFFSET_BITS 64 #define _LARGE_FILES #define _BSD_SOURCE 1 /* Make sure strdup() is in string.h */ #define _XOPEN_SOURCE 500 /* Make sure strdup() is in string.h */ #include #include #include #include #include #include "pm_c_util.h" #include "mallocvar.h" #include "nstring.h" #include "pam.h" #include "ppm.h" #include "libpbm.h" #include "libpgm.h" #include "libppm.h" #include "colorname.h" #include "fileio.h" #include "libpam.h" static unsigned int allocationDepth(const struct pam * const pamP) { unsigned int retval; if (pamP->len >= PAM_STRUCT_SIZE(allocation_depth)) { if (pamP->allocation_depth == 0) retval = pamP->depth; else { if (pamP->depth > pamP->allocation_depth) pm_error("'allocationDepth' (%u) is smaller than 'depth' (%u)", pamP->allocation_depth, pamP->depth); retval = pamP->allocation_depth; } } else retval = pamP->depth; return retval; } static const char ** pamCommentP(const struct pam * const pamP) { const char ** retval; if (pamP->len >= PAM_STRUCT_SIZE(comment_p)) retval = pamP->comment_p; else retval = NULL; return retval; } static void validateComputableSize(struct pam * const pamP) { /*---------------------------------------------------------------------------- Validate that the dimensions of the image are such that it can be processed in typical ways on this machine without worrying about overflows. Note that in C, arithmetic is always modulus arithmetic, so if your values are too big, the result is not what you expect. That failed expectation can be disastrous if you use it to allocate memory. It is very normal to allocate space for a tuplerow, so we make sure the size of a tuple row, in bytes, can be represented by an 'int'. Another common operation is adding 1 or 2 to the highest row, column, or plane number in the image, so we make sure that's possible. -----------------------------------------------------------------------------*/ if (pamP->width == 0) pm_error("Width is zero. Image must be at least one pixel wide"); else if (pamP->height == 0) pm_error("Height is zero. Image must be at least one pixel high"); else { unsigned int const depth = allocationDepth(pamP); if (depth > INT_MAX/sizeof(sample)) pm_error("image depth (%u) too large to be processed", depth); else if (depth * sizeof(sample) > INT_MAX/pamP->width) pm_error("image width and depth (%u, %u) too large " "to be processed.", pamP->width, depth); else if (pamP->width * (depth * sizeof(sample)) > INT_MAX - depth * sizeof(tuple *)) pm_error("image width and depth (%u, %u) too large " "to be processed.", pamP->width, depth); if (depth > INT_MAX - 2) pm_error("image depth (%u) too large to be processed", depth); if (pamP->width > INT_MAX - 2) pm_error("image width (%u) too large to be processed", pamP->width); if (pamP->height > INT_MAX - 2) pm_error("image height (%u) too large to be processed", pamP->height); } } tuple pnm_allocpamtuple(const struct pam * const pamP) { tuple retval; retval = malloc(allocationDepth(pamP) * sizeof(retval[0])); if (retval == NULL) pm_error("Out of memory allocating %u-plane tuple", allocationDepth(pamP)); return retval; } int pnm_tupleequal(const struct pam * const pamP, tuple const comparand, tuple const comparator) { unsigned int plane; bool equal; equal = TRUE; /* initial value */ for (plane = 0; plane < pamP->depth; ++plane) if (comparand[plane] != comparator[plane]) equal = FALSE; return equal; } void pnm_assigntuple(const struct pam * const pamP, tuple const dest, tuple const source) { unsigned int plane; for (plane = 0; plane < pamP->depth; ++plane) { dest[plane] = source[plane]; } } static void scaleTuple(const struct pam * const pamP, tuple const dest, tuple const source, sample const newmaxval) { unsigned int plane; for (plane = 0; plane < pamP->depth; ++plane) dest[plane] = pnm_scalesample(source[plane], pamP->maxval, newmaxval); } void pnm_scaletuple(const struct pam * const pamP, tuple const dest, tuple const source, sample const newmaxval) { scaleTuple(pamP, dest, source, newmaxval); } void pnm_createBlackTuple(const struct pam * const pamP, tuple * const blackTupleP) { /*---------------------------------------------------------------------------- Create a "black" tuple. By that we mean a tuple all of whose elements are zero. If it's an RGB, grayscale, or b&w pixel, that means it's black. -----------------------------------------------------------------------------*/ unsigned int i; *blackTupleP = pnm_allocpamtuple(pamP); for (i = 0; i < pamP->depth; ++i) (*blackTupleP)[i] = 0; } void createBlackTuple(const struct pam * const pamP, tuple * const blackTupleP) { /* This is poorly named, because it lacks the "pnm" prefix. But for some reason, this is how we originally named this. So to maintain backward compatibility with binaries that refer to "createBlackTuple", we define this. The preferred name, pnm_createBlackTuple() was new in Netpbm 10.20, January 2004. We should eventually retire createBlackTuple(). */ pnm_createBlackTuple(pamP, blackTupleP); } static tuple * allocPamRow(const struct pam * const pamP) { /*---------------------------------------------------------------------------- We assume that the dimensions of the image are such that arithmetic overflow will not occur in our calculations. NOTE: pnm_readpaminit() ensures this assumption is valid. -----------------------------------------------------------------------------*/ /* The tuple row data structure starts with 'width' pointers to the tuples, immediately followed by the 'width' tuples themselves. Each tuple consists of 'depth' samples. */ int const bytesPerTuple = allocationDepth(pamP) * sizeof(sample); tuple * tuplerow; tuplerow = malloc(pamP->width * (sizeof(tuple *) + bytesPerTuple)); if (tuplerow != NULL) { /* Now we initialize the pointers to the individual tuples to make this a regulation C two dimensional array. */ char * p; unsigned int col; p = (char*) (tuplerow + pamP->width); /* location of Tuple 0 */ for (col = 0; col < pamP->width; ++col) { tuplerow[col] = (tuple) p; p += bytesPerTuple; } } return tuplerow; } tuple * pnm_allocpamrow(const struct pam * const pamP) { tuple * const tuplerow = allocPamRow(pamP); if (tuplerow == NULL) pm_error("Out of memory allocating space for a tuple row of\n" "%d tuples by %d samples per tuple by %d bytes per sample.", pamP->width, allocationDepth(pamP), sizeof(sample)); return tuplerow; } static unsigned int rowimagesize(const struct pam * const pamP) { /* If repeatedly calculating this turns out to be a significant performance problem, we could keep this in struct pam like bytes_per_sample. */ if (PAM_FORMAT_TYPE(pamP->format) == PBM_TYPE) return pbm_packed_bytes(pamP->width); else return (pamP->width * pamP->bytes_per_sample * pamP->depth); } unsigned char * pnm_allocrowimage(const struct pam * const pamP) { unsigned int const rowsize = rowimagesize(pamP); unsigned int const overrunSpaceNeeded = 8; /* This is the number of extra bytes of space libnetpbm needs to have at the end of the buffer so it can use fast, lazy algorithms. */ unsigned int const size = rowsize + overrunSpaceNeeded; unsigned char * retval; retval = malloc(size); if (retval == NULL) pm_error("Unable to allocate %u bytes for a row image buffer", size); return retval; } void pnm_freerowimage(unsigned char * const rowimage) { free(rowimage); } void pnm_scaletuplerow(const struct pam * const pamP, tuple * const destRow, tuple * const sourceRow, sample const newMaxval) { if (pamP->maxval == newMaxval) { /* Fast path for common case: no scaling needed */ if (destRow != sourceRow) { /* Fast path for common case: it's already what it needs to be */ unsigned int col; for (col = 0; col < pamP->width; ++col) pnm_assigntuple(pamP, destRow[col], sourceRow[col]); } } else { unsigned int col; for (col = 0; col < pamP->width; ++col) scaleTuple(pamP, destRow[col], sourceRow[col], newMaxval); } } tuple ** pnm_allocpamarray(const struct pam * const pamP) { tuple **tuplearray; /* If the speed of this is ever an issue, it might be sped up a little by allocating one large chunk. */ MALLOCARRAY(tuplearray, pamP->height); if (tuplearray == NULL) pm_error("Out of memory allocating the row pointer section of " "a %u row array", pamP->height); else { int row; bool outOfMemory; outOfMemory = FALSE; for (row = 0; row < pamP->height && !outOfMemory; ++row) { tuplearray[row] = allocPamRow(pamP); if (tuplearray[row] == NULL) { unsigned int freerow; outOfMemory = TRUE; for (freerow = 0; freerow < row; ++freerow) pnm_freepamrow(tuplearray[row]); } } if (outOfMemory) { free(tuplearray); pm_error("Out of memory allocating the %u rows %u columns wide by " "%u planes deep", pamP->height, pamP->width, allocationDepth(pamP)); } } return tuplearray; } void pnm_freepamarray(tuple ** const tuplearray, const struct pam * const pamP) { int row; for (row = 0; row < pamP->height; row++) pnm_freepamrow(tuplearray[row]); free(tuplearray); } void pnm_setminallocationdepth(struct pam * const pamP, unsigned int const allocationDepth) { if (pamP->len < PAM_STRUCT_SIZE(allocation_depth)) pm_error("Can't set minimum allocation depth in pam structure, " "because the structure is only %u bytes long, and to " "have an allocation_depth field, it must bea at least %u", pamP->len, PAM_STRUCT_SIZE(allocation_depth)); pamP->allocation_depth = MAX(allocationDepth, pamP->depth); validateComputableSize(pamP); } void pnm_setpamrow(const struct pam * const pamP, tuple * const tuplerow, sample const value) { int col; for (col = 0; col < pamP->width; ++col) { int plane; for (plane = 0; plane < pamP->depth; ++plane) tuplerow[col][plane] = value; } } #define MAX_LABEL_LENGTH 8 #define MAX_VALUE_LENGTH 255 static void parse_header_line(const char buffer[], char label[MAX_LABEL_LENGTH+1], char value[MAX_VALUE_LENGTH+1]) { int buffer_curs; buffer_curs = 0; /* Skip initial white space */ while (ISSPACE(buffer[buffer_curs])) buffer_curs++; { /* Read off label, put as much as will fit into label[] */ int label_curs; label_curs = 0; while (!ISSPACE(buffer[buffer_curs]) && buffer[buffer_curs] != '\0') { if (label_curs < MAX_LABEL_LENGTH) label[label_curs++] = buffer[buffer_curs]; buffer_curs++; } label[label_curs] = '\0'; /* null terminate it */ } /* Skip white space between label and value */ while (ISSPACE(buffer[buffer_curs])) buffer_curs++; /* copy value into value[] */ strncpy(value, buffer+buffer_curs, MAX_VALUE_LENGTH+1); { /* Remove trailing white space from value[] */ int value_curs; value_curs = strlen(value)-1; while (value_curs >= 0 && ISSPACE(value[value_curs])) value[value_curs--] = '\0'; } } struct headerSeen { /*---------------------------------------------------------------------------- This structure tells what we've seen so far in our progress through the PAM header -----------------------------------------------------------------------------*/ bool width; bool height; bool depth; bool maxval; bool endhdr; }; static void process_header_line(char const buffer[], struct pam * const pamP, struct headerSeen * const headerSeenP) { /*---------------------------------------------------------------------------- Process a line from the PAM header. The line is buffer[], and it is not a comment or blank. Put the value that the line defines in *pamP (unless it's ENDHDR). Update *headerSeenP with whatever we see. -----------------------------------------------------------------------------*/ char label[MAX_LABEL_LENGTH+1]; char value[MAX_VALUE_LENGTH+1]; parse_header_line(buffer, label, value); if (strcmp(label, "ENDHDR") == 0) headerSeenP->endhdr = TRUE; else { if (strcmp(label, "WIDTH") == 0 || strcmp(label, "HEIGHT") == 0 || strcmp(label, "DEPTH") == 0 || strcmp(label, "MAXVAL") == 0) { if (strlen(value) == 0) pm_error("Missing value for %s in PAM file header.", label); else { char *endptr; long int numeric_value; errno = 0; /* Clear errno so we can detect strtol() failure */ numeric_value = strtol(value, &endptr, 10); if (errno != 0) pm_error("Too-large value for %s in " "PAM file header: '%s'", label, value); if (*endptr != '\0') pm_error("Non-numeric value for %s in " "PAM file header: '%s'", label, value); else if (numeric_value < 0) pm_error("Negative value for %s in " "PAM file header: '%s'", label, value); } } if (strcmp(label, "WIDTH") == 0) { pamP->width = atoi(value); headerSeenP->width = TRUE; } else if (strcmp(label, "HEIGHT") == 0) { pamP->height = atoi(value); headerSeenP->height = TRUE; } else if (strcmp(label, "DEPTH") == 0) { pamP->depth = atoi(value); headerSeenP->depth = TRUE; } else if (strcmp(label, "MAXVAL") == 0) { pamP->maxval = atoi(value); headerSeenP->maxval = TRUE; } else if (strcmp(label, "TUPLTYPE") == 0) { if (strlen(value) == 0) pm_error("TUPLTYPE header does not have any tuple type text"); else { size_t const oldLen = strlen(pamP->tuple_type); if (oldLen + strlen(value) + 1 > sizeof(pamP->tuple_type)-1) pm_error("TUPLTYPE value too long in PAM header"); if (oldLen == 0) strcpy(pamP->tuple_type, value); else { strcat(pamP->tuple_type, " "); strcat(pamP->tuple_type, value); } pamP->tuple_type[sizeof(pamP->tuple_type)-1] = '\0'; } } else pm_error("Unrecognized header line: '%s'. " "Possible missing ENDHDR line?", label); } } static void appendComment(char ** const commentsP, const char * const commentHeader) { const char * const commentLine = &commentHeader[1]; size_t commentLen = strlen(*commentsP) + strlen(commentLine) + 1; assert(commentHeader[0] == '#'); REALLOCARRAY(*commentsP, commentLen); if (*commentsP == NULL) pm_error("Couldn't get storage for %u characters of comments from " "the PAM header", commentLen); strcat(*commentsP, commentLine); } static void disposeOfComments(const struct pam * const pamP, const char * const comments) { const char ** const retP = pamCommentP(pamP); if (retP) *retP = comments; else strfree(comments); } static void readpaminitrest(struct pam * const pamP) { /*---------------------------------------------------------------------------- Read the rest of the PAM header (after the first line -- the magic number line). Fill in all the information in *pamP. -----------------------------------------------------------------------------*/ struct headerSeen headerSeen; char * comments; headerSeen.width = FALSE; headerSeen.height = FALSE; headerSeen.depth = FALSE; headerSeen.maxval = FALSE; headerSeen.endhdr = FALSE; pamP->tuple_type[0] = '\0'; comments = strdup(""); { int c; /* Read off rest of 1st line -- probably just the newline after the magic number */ while ((c = getc(pamP->file)) != -1 && c != '\n'); } while (!headerSeen.endhdr) { char buffer[256]; char * rc; rc = fgets(buffer, sizeof(buffer), pamP->file); if (rc == NULL) pm_error("EOF or error reading file while trying to read the " "PAM header"); else { buffer[256-1-1] = '\n'; /* In case fgets() truncated */ if (buffer[0] == '#') appendComment(&comments, buffer); else if (stripeq(buffer, "")); /* Ignore it; it's a blank line */ else process_header_line(buffer, pamP, &headerSeen); } } disposeOfComments(pamP, comments); if (!headerSeen.height) pm_error("No HEIGHT header line in PAM header"); if (!headerSeen.width) pm_error("No WIDTH header line in PAM header"); if (!headerSeen.depth) pm_error("No DEPTH header line in PAM header"); if (!headerSeen.maxval) pm_error("No MAXVAL header line in PAM header"); if (pamP->height == 0) pm_error("HEIGHT value is zero in PAM header"); if (pamP->width == 0) pm_error("WIDTH value is zero in PAM header"); if (pamP->depth == 0) pm_error("DEPTH value is zero in PAM header"); if (pamP->maxval == 0) pm_error("MAXVAL value is zero in PAM header"); if (pamP->maxval > PAM_OVERALL_MAXVAL) pm_error("MAXVAL value (%lu) in PAM header is greater than %u", pamP->maxval, PAM_OVERALL_MAXVAL); } void pnm_readpaminitrestaspnm(FILE * const fileP, int * const colsP, int * const rowsP, gray * const maxvalP, int * const formatP) { /*---------------------------------------------------------------------------- Read the rest of the PAM header (after the first line) and return information as if it were PPM or PGM. Die if it isn't a PAM of the sort we can treat as PPM or PGM. -----------------------------------------------------------------------------*/ struct pam pam; pam.size = sizeof(struct pam); pam.file = fileP; pam.len = PAM_STRUCT_SIZE(tuple_type); pam.format = PAM_FORMAT; readpaminitrest(&pam); /* A PAM raster of depth 1 is identical to a PGM raster. A PAM raster of depth 3 is identical to PPM raster. So ppm_readppmrow() will be able to read the PAM raster as long as the format it thinks it is (PGM or PPM) corresponds to the PAM depth. Similar for pgm_readpgmrow(). */ switch (pam.depth) { case 3: *formatP = RPPM_FORMAT; break; case 1: *formatP = RPGM_FORMAT; break; default: pm_error("Cannot treat PAM image as PPM or PGM, " "because its depth (%u) " "is not 1 or 3.", pam.depth); } *colsP = pam.width; *rowsP = pam.height; *maxvalP = (gray)pam.maxval; } unsigned int pnm_bytespersample(sample const maxval) { assert(sizeof(maxval) * 8 <= 32); if (maxval >> 8 == 0) return 1; else if (maxval >> 16 == 0) return 2; else if (maxval >> 24 == 0) return 3; else return 4; } void pnm_readpaminit(FILE * const file, struct pam * const pamP, int const size) { if (size < PAM_STRUCT_SIZE(tuple_type)) pm_error("pam object passed to pnm_readpaminit() is too small. " "It must be large\n" "enough to hold at least up to the " "'tuple_type' member, but according\n" "to the 'size' argument, it is only %d bytes long.", size); pamP->size = size; pamP->file = file; pamP->len = MIN(pamP->size, sizeof(struct pam)); if (size >= PAM_STRUCT_SIZE(allocation_depth)) pamP->allocation_depth = 0; /* Get magic number. */ pamP->format = pm_readmagicnumber(file); switch (PAM_FORMAT_TYPE(pamP->format)) { case PAM_TYPE: readpaminitrest(pamP); break; case PPM_TYPE: { pixval maxval; ppm_readppminitrest(pamP->file, &pamP->width, &pamP->height, &maxval); pamP->maxval = (sample) maxval; pamP->depth = 3; strcpy(pamP->tuple_type, PAM_PPM_TUPLETYPE); if (pamCommentP(pamP)) *pamP->comment_p = strdup(""); } break; case PGM_TYPE: { gray maxval; pgm_readpgminitrest(pamP->file, &pamP->width, &pamP->height, &maxval); pamP->maxval = (sample) maxval; pamP->depth = 1; strcpy(pamP->tuple_type, PAM_PGM_TUPLETYPE); if (pamCommentP(pamP)) *pamP->comment_p = strdup(""); } break; case PBM_TYPE: pbm_readpbminitrest(pamP->file, &pamP->width,&pamP->height); pamP->maxval = (sample) 1; pamP->depth = 1; strcpy(pamP->tuple_type, PAM_PBM_TUPLETYPE); if (pamCommentP(pamP)) *pamP->comment_p = strdup(""); break; default: pm_error("bad magic number 0x%x - not a PAM, PPM, PGM, or PBM file", pamP->format); } pamP->bytes_per_sample = pnm_bytespersample(pamP->maxval); pamP->plainformat = FALSE; /* See below for complex explanation of why this is FALSE. */ validateComputableSize(pamP); } static void writeComments(const struct pam * const pamP) { /*---------------------------------------------------------------------------- Write comments for a PAM header, insofar as *pamP specifies comments. -----------------------------------------------------------------------------*/ const char ** const commentP = pamCommentP(pamP); if (commentP) { const char * const comment = *commentP; const char * p; bool startOfLine; for (p = &comment[0], startOfLine = TRUE; *p; ++p) { if (startOfLine) fputc('#', pamP->file); fputc(*p, pamP->file); if (*p == '\n') startOfLine = TRUE; else startOfLine = FALSE; } if (!startOfLine) fputc('\n', pamP->file); } } /* About the 'plainformat' member on image input operations: 'plainformat' is meaningless when reading an image, but we always set it FALSE anyway. That's because it is common for a program to copy a pam structure used for input as a pam structure for output, and just update the few fields it cares about -- mainly 'file'. We want a program like that to write a raw format image, and 'plainformat' in an output pam structure is what determines whether it is raw or plain. So we set it false here so that it is false in the copied output pam structure. Before 10.32, we set 'plainformat' according to the plainness of the input image, and thought it was a good idea for a program that reads a plain format input image to write a plain format output image. But that is not what the older libnetpbm facilities (e.g. pnm_writepnm()) do, so for compatibility, the pam facility shouldn't either. This came to light as we converted programs from the pnm/pbm/ppm facilities to pam. */ void pnm_writepaminit(struct pam * const pamP) { const char * tupleType; if (pamP->size < pamP->len) pm_error("pam object passed to pnm_writepaminit() is smaller " "(%u bytes, according to its 'size' element) " "than the amount of data in it " "(%u bytes, according to its 'len' element).", pamP->size, pamP->len); if (pamP->size < PAM_STRUCT_SIZE(bytes_per_sample)) pm_error("pam object passed to pnm_writepaminit() is too small. " "It must be large\n" "enough to hold at least up through the " "'bytes_per_sample' member, but according\n" "to its 'size' member, it is only %u bytes long.", pamP->size); if (pamP->len < PAM_STRUCT_SIZE(maxval)) pm_error("pam object must contain members at least through 'maxval', " "but according to the 'len' member, it is only %u bytes " "long.", pamP->len); if (pamP->maxval > PAM_OVERALL_MAXVAL) pm_error("maxval (%lu) passed to pnm_writepaminit() " "is greater than %u", pamP->maxval, PAM_OVERALL_MAXVAL); if (pamP->len < PAM_STRUCT_SIZE(tuple_type)) tupleType = ""; else tupleType = pamP->tuple_type; if (pamP->len < PAM_STRUCT_SIZE(bytes_per_sample)) pamP->len = PAM_STRUCT_SIZE(bytes_per_sample); pamP->bytes_per_sample = pnm_bytespersample(pamP->maxval); switch (PAM_FORMAT_TYPE(pamP->format)) { case PAM_TYPE: if (pm_plain_output) pm_error("There is no plain version of PAM. -plain option " "is not allowed"); fprintf(pamP->file, "P7\n"); writeComments(pamP); fprintf(pamP->file, "WIDTH %u\n", (unsigned)pamP->width); fprintf(pamP->file, "HEIGHT %u\n", (unsigned)pamP->height); fprintf(pamP->file, "DEPTH %u\n", pamP->depth); fprintf(pamP->file, "MAXVAL %lu\n", pamP->maxval); if (!stripeq(tupleType, "")) fprintf(pamP->file, "TUPLTYPE %s\n", pamP->tuple_type); fprintf(pamP->file, "ENDHDR\n"); break; case PPM_TYPE: /* The depth must be exact, because pnm_writepamrow() is controlled by it, without regard to format. */ if (pamP->depth != 3) pm_error("pnm_writepaminit() got PPM format, but depth = %d " "instead of 3, as required for PPM.", pamP->depth); if (pamP->maxval > PPM_OVERALLMAXVAL) pm_error("pnm_writepaminit() got PPM format, but maxval = %ld, " "which exceeds the maximum allowed for PPM: %d", pamP->maxval, PPM_OVERALLMAXVAL); ppm_writeppminit(pamP->file, pamP->width, pamP->height, (pixval) pamP->maxval, pamP->plainformat); break; case PGM_TYPE: if (pamP->depth != 1) pm_error("pnm_writepaminit() got PGM format, but depth = %d " "instead of 1, as required for PGM.", pamP->depth); if (pamP->maxval > PGM_OVERALLMAXVAL) pm_error("pnm_writepaminit() got PGM format, but maxval = %ld, " "which exceeds the maximum allowed for PGM: %d", pamP->maxval, PGM_OVERALLMAXVAL); pgm_writepgminit(pamP->file, pamP->width, pamP->height, (gray) pamP->maxval, pamP->plainformat); break; case PBM_TYPE: if (pamP->depth != 1) pm_error("pnm_writepaminit() got PBM format, but depth = %d " "instead of 1, as required for PBM.", pamP->depth); if (pamP->maxval != 1) pm_error("pnm_writepaminit() got PBM format, but maxval = %ld " "instead of 1, as required for PBM.", pamP->maxval); pbm_writepbminit(pamP->file, pamP->width, pamP->height, pamP->plainformat); break; default: pm_error("Invalid format passed to pnm_writepaminit(): %d", pamP->format); } } void pnm_checkpam(const struct pam * const pamP, enum pm_check_type const checkType, enum pm_check_code * const retvalP) { if (checkType != PM_CHECK_BASIC) { if (retvalP) *retvalP = PM_CHECK_UNKNOWN_TYPE; } else switch (PAM_FORMAT_TYPE(pamP->format)) { case PAM_TYPE: { pm_filepos const need_raster_size = pamP->width * pamP->height * pamP->depth * pamP->bytes_per_sample; pm_check(pamP->file, checkType, need_raster_size, retvalP); } break; case PPM_TYPE: pgm_check(pamP->file, checkType, pamP->format, pamP->width, pamP->height, pamP->maxval, retvalP); break; case PGM_TYPE: pgm_check(pamP->file, checkType, pamP->format, pamP->width, pamP->height, pamP->maxval, retvalP); break; case PBM_TYPE: pbm_check(pamP->file, checkType, pamP->format, pamP->width, pamP->height, retvalP); break; default: if (retvalP) *retvalP = PM_CHECK_UNCHECKABLE; } } void pnm_maketuplergb(const struct pam * const pamP, tuple const tuple) { if (allocationDepth(pamP) < 3) pm_error("allocation depth %u passed to pnm_maketuplergb(). " "Must be at least 3.", allocationDepth(pamP)); if (pamP->depth < 3) tuple[2] = tuple[1] = tuple[0]; } void pnm_makerowrgb(const struct pam * const pamP, tuple * const tuplerow) { if (pamP->depth < 3) { unsigned int col; if (allocationDepth(pamP) < 3) pm_error("allocation depth %u passed to pnm_makerowrgb(). " "Must be at least 3.", allocationDepth(pamP)); if (strncmp(pamP->tuple_type, "RGB", 3) != 0) { for (col = 0; col < pamP->width; ++col) { tuple const thisTuple = tuplerow[col]; thisTuple[2] = thisTuple[1] = thisTuple[0]; } } } } void pnm_makearrayrgb(const struct pam * const pamP, tuple ** const tuples) { if (pamP->depth < 3) { unsigned int row; if (allocationDepth(pamP) < 3) pm_error("allocation depth %u passed to pnm_makearrayrgb(). " "Must be at least 3.", allocationDepth(pamP)); for (row = 0; row < pamP->height; ++row) { tuple * const tuplerow = tuples[row]; unsigned int col; for (col = 0; col < pamP->width; ++col) { tuple const thisTuple = tuplerow[col]; thisTuple[2] = thisTuple[1] = thisTuple[0]; } } } } void pnm_getopacity(const struct pam * const pamP, bool * const haveOpacityP, unsigned int * const opacityPlaneP) { /* Design note; If use of this information proliferates, we should probably add it to struct pam as convenience values analogous to bytes_per_sample. */ if (strcmp(pamP->tuple_type, "RGB_ALPHA") == 0) { *haveOpacityP = TRUE; *opacityPlaneP = PAM_TRN_PLANE; } else if (strcmp(pamP->tuple_type, "GRAYSCALE_ALPHA") == 0) { *haveOpacityP = TRUE; *opacityPlaneP = PAM_GRAY_TRN_PLANE; } else *haveOpacityP = FALSE; } /*============================================================================= pm_system() Standard Input feeder and Standard Output accepter functions. =============================================================================*/ void pm_feed_from_pamtuples(int const pipeToFeedFd, void * const feederParm) { struct pamtuples * const inputTuplesP = feederParm; struct pam outpam; outpam = *inputTuplesP->pamP; outpam.file = fdopen(pipeToFeedFd, "w"); /* The following signals (and normally kills) the process with SIGPIPE if the pipe does not take all the data. */ pnm_writepam(&outpam, *inputTuplesP->tuplesP); pm_close(outpam.file); } void pm_accept_to_pamtuples(int const pipeToSuckFd, void * const accepterParm ) { struct pamtuples * const outputTuplesP = accepterParm; struct pam * const inpamP = outputTuplesP->pamP; *outputTuplesP->tuplesP = pnm_readpam(fdopen(pipeToSuckFd, "r"), inpamP, PAM_STRUCT_SIZE(tuple_type)); pm_close(inpamP->file); }