diff options
Diffstat (limited to 'converter/other/pstopnm.c')
| -rw-r--r-- | converter/other/pstopnm.c | 285 |
1 files changed, 181 insertions, 104 deletions
diff --git a/converter/other/pstopnm.c b/converter/other/pstopnm.c index 19b1630a..f5342655 100644 --- a/converter/other/pstopnm.c +++ b/converter/other/pstopnm.c @@ -14,8 +14,9 @@ -----------------------------------------------------------------------------*/ +#define _DEFAULT_SOURCE 1 /* New name for SVID & BSD source defines */ #define _BSD_SOURCE 1 /* Make sure strdup() is in string.h */ -#define _XOPEN_SOURCE 500 +#define _XOPEN_SOURCE 500 /* Make sure fdopen() is in stdio.h and strdup() is in string.h */ #include <assert.h> @@ -24,7 +25,7 @@ #include <stdlib.h> #include <stdio.h> #include <signal.h> -#include <sys/wait.h> +#include <sys/wait.h> #include <sys/stat.h> #include "pm_c_util.h" @@ -37,17 +38,32 @@ static bool verbose; enum Orientation {PORTRAIT, LANDSCAPE, UNSPECIFIED}; struct Box { - /* Description of a rectangle within an image; all coordinates - measured in points (1/72") with lower left corner of page being the - origin. + /* Description of a rectangle within an image; all coordinates + measured in points (1/72") with lower left corner of page being the + origin. Negative values are OK. */ + bool isDefined; + + /* Nothing below is meaningful unless 'isDefined' is true */ int llx; /* lower left X coord */ - /* -1 for llx means whole box is undefined. */ int lly; /* lower left Y coord */ int urx; /* upper right X coord */ int ury; /* upper right Y coord */ }; + + +static void +assertValidBox(struct Box const box) { + + if (box.isDefined) { + assert(box.urx >= box.llx); + assert(box.ury >= box.lly); + } +} + + + struct Dimensions { /*---------------------------------------------------------------------------- Horizontal and vertical dimensions of something, both in pixels and @@ -106,7 +122,7 @@ parseCommandLine(int argc, char ** argv, unsigned int textalphabitsSpec; MALLOCARRAY_NOFAIL(option_def, 100); - + option_def_index = 0; /* incremented by OPTENTRY */ OPTENT3(0, "forceplain", OPT_FLAG, NULL, &cmdlineP->forceplain, 0); OPTENT3(0, "llx", OPT_FLOAT, &llx, &llxSpec, 0); @@ -150,7 +166,7 @@ parseCommandLine(int argc, char ** argv, if (ymaxSpec) { if (cmdlineP->ymax == 0) pm_error("zero is not a valid value for -ymax"); - } else + } else cmdlineP->ymax = 792; if (xsizeSpec) { @@ -162,7 +178,7 @@ parseCommandLine(int argc, char ** argv, if (ysizeSpec) { if (cmdlineP->ysize == 0) pm_error("zero is not a valid value for -ysize"); - } else + } else cmdlineP->ysize = 0; if (portraitOpt && !landscapeOpt) @@ -184,9 +200,11 @@ parseCommandLine(int argc, char ** argv, cmdlineP->formatType = PPM_TYPE; /* If any one of the 4 bounding box coordinates is given on the - command line, we default any of the 4 that aren't. + command line, we default any of the 4 that aren't. */ if (llxSpec || llySpec || urxSpec || urySpec) { + cmdlineP->extractBox.isDefined = true; + if (!llxSpec) cmdlineP->extractBox.llx = 72; else cmdlineP->extractBox.llx = llx * 72; if (!llySpec) cmdlineP->extractBox.lly = 72; @@ -196,7 +214,7 @@ parseCommandLine(int argc, char ** argv, if (!urySpec) cmdlineP->extractBox.ury = 720; else cmdlineP->extractBox.ury = ury * 72; } else { - cmdlineP->extractBox.llx = -1; + cmdlineP->extractBox.isDefined = false; } if (dpiSpec) { @@ -224,7 +242,7 @@ parseCommandLine(int argc, char ** argv, cmdlineP->inputFileName = "-"; /* stdin */ else if (argc-1 == 1) cmdlineP->inputFileName = argv[1]; - else + else pm_error("Too many arguments (%d). " "Only need one: the Postscript file name", argc-1); @@ -248,7 +266,7 @@ addPsToFileName(char const origFileName[], int statRc; statRc = lstat(origFileName, &statbuf); - + if (statRc == 0) *newFileNameP = strdup(origFileName); else { @@ -269,34 +287,62 @@ addPsToFileName(char const origFileName[], +static unsigned int +resolution(unsigned int const dotCt, + unsigned int const pointCt) { +/*---------------------------------------------------------------------------- + The resolution in dots per inch when 'dotCt' dots print 'pointCt' points + long. + + When this would round to zero, we return 1 dot per inch instead so it + doesn't play havoc with arithmetic - it's never going to happen unless + something is broken anyway. +-----------------------------------------------------------------------------*/ + return MAX(1, (unsigned int)((float)dotCt * 72 / pointCt + 0.5)); +} + + + static void computeSizeResFromSizeSpec(unsigned int const requestedXsize, unsigned int const requestedYsize, unsigned int const imageWidth, unsigned int const imageHeight, struct Dimensions * const imageDimP) { +/*---------------------------------------------------------------------------- + Compute output image size and assumed Postscript input resolution, assuming + user requested a specific size for at least one of the dimensions and the + input is 'imageWidth' x 'imageHeight' points. + + 'requestedXsize' is what the user requested for output image width in + pixels, or zero if he made no request. 'requestedYsize' is analogous + for the height. +-----------------------------------------------------------------------------*/ + assert(requestedXsize || requestedYsize); + + assert(imageWidth > 0); if (requestedXsize) { imageDimP->xsize = requestedXsize; - imageDimP->xres = (unsigned int) - (requestedXsize * 72 / imageWidth + 0.5); + imageDimP->xres = resolution(requestedXsize, imageWidth); if (!requestedYsize) { imageDimP->yres = imageDimP->xres; imageDimP->ysize = (unsigned int) (imageHeight * (float)imageDimP->yres/72 + 0.5); - } } + } + + assert(imageHeight > 0); if (requestedYsize) { imageDimP->ysize = requestedYsize; - imageDimP->yres = (unsigned int) - (requestedYsize * 72 / imageHeight + 0.5); + imageDimP->yres = resolution(requestedYsize, imageHeight); if (!requestedXsize) { imageDimP->xres = imageDimP->yres; imageDimP->xsize = (unsigned int) (imageWidth * (float)imageDimP->xres/72 + 0.5); } - } + } } @@ -312,8 +358,9 @@ computeSizeResBlind(unsigned int const xmax, if (imageWidth == 0 || imageHeight == 0) { imageDimP->xres = imageDimP->yres = 72; } else { - imageDimP->xres = imageDimP->yres = MIN(xmax * 72 / imageWidth, - ymax * 72 / imageHeight); + imageDimP->xres = imageDimP->yres = + MIN(resolution(xmax, imageWidth), + resolution(ymax, imageHeight)); } if (nocrop) { @@ -330,17 +377,17 @@ computeSizeResBlind(unsigned int const xmax, static void -computeSizeRes(struct CmdlineInfo const cmdline, +computeSizeRes(struct CmdlineInfo const cmdline, struct Box const borderedBox, struct Dimensions * const imageDimP) { /*---------------------------------------------------------------------------- Figure out how big the output image should be and what output device resolution Ghostscript should assume (return as *imageDimP). - A resolution number is the number of pixels per inch that the a + A resolution number is the number of pixels per inch that the printer prints. Since we're emulating a printed page with a PNM image, and a PNM image has no spatial dimension (you can't say how - many inches wide a PNM image is), it's kind of confusing. + many inches wide a PNM image is), it's kind of confusing. If the user doesn't select a resolution, we choose the resolution that causes the image to be a certain number of pixels, knowing how @@ -349,8 +396,8 @@ computeSizeRes(struct CmdlineInfo const cmdline, inches wide. We want the PNM image to be 1000 pixels wide. So we tell Ghostscript that our horizontal output device resolution is 500 pixels per inch. - - X and Y in all returned values is with respect to the image, not the + + X and Y in all returned values are with respect to the image, not the page. Note that the image might be placed sideways on the page, so that page X and Y would be reversed from image X and Y. -----------------------------------------------------------------------------*/ @@ -360,6 +407,8 @@ computeSizeRes(struct CmdlineInfo const cmdline, unsigned int const sx = borderedBox.urx - borderedBox.llx; unsigned int const sy = borderedBox.ury - borderedBox.lly; + assertValidBox(borderedBox); assert(borderedBox.isDefined); + if (cmdline.dpi) { /* User gave resolution; we figure out output image size */ imageDimP->xres = imageDimP->yres = cmdline.dpi; @@ -369,6 +418,7 @@ computeSizeRes(struct CmdlineInfo const cmdline, if (sx == 0 || sy == 0) pm_error("Input image is zero size; we cannot satisfy your " "produce your requested output dimensions"); + computeSizeResFromSizeSpec(cmdline.xsize, cmdline.ysize, sx, sy, imageDimP); } else @@ -397,7 +447,7 @@ languageDeclaration(char const inputFileName[]) { enum PostscriptLanguage language; if (streq(inputFileName, "-")) - /* Can't read stdin, because we need it to remain positioned for the + /* Can't read stdin, because we need it to remain positioned for the Ghostscript interpreter to read it. */ language = COMMON_POSTSCRIPT; @@ -430,12 +480,57 @@ languageDeclaration(char const inputFileName[]) { static struct Box +boundingBoxFmPostscriptFile(FILE * const ifP) { + + struct Box retval; + bool eof; + + for (retval.isDefined = false, eof = false; !retval.isDefined && !eof; ) { + char line[200]; + char * fgetsRc; + + fgetsRc = fgets(line, sizeof(line), ifP); + + if (fgetsRc == NULL) + eof = true; + else { + int rc; + int llx, lly, urx, ury; + + rc = sscanf(line, "%%%%BoundingBox: %d %d %d %d", + &llx, &lly, &urx, &ury); + if (rc == 4) { + /* We found a BoundingBox statement */ + + if (llx > urx) + pm_error("%%%%BoundingBox statement in input file has " + "lower left corner to the right of the " + "upper right corner"); + if (lly > ury) + pm_error("%%%%BoundingBox statement in input file has " + "lower left corner above the " + "upper right corner"); + + retval.llx = llx; retval.lly = lly; + retval.urx = urx; retval.ury = ury; + retval.isDefined = true; + } + } + } + fclose(ifP); + + return retval; +} + + + +static struct Box computeBoxToExtract(struct Box const cmdlineExtractBox, char const inputFileName[]) { struct Box retval; - if (cmdlineExtractBox.llx != -1) + if (cmdlineExtractBox.isDefined) /* User told us what box to extract, so that's what we'll do */ retval = cmdlineExtractBox; else { @@ -446,54 +541,37 @@ computeBoxToExtract(struct Box const cmdlineExtractBox, if (streq(inputFileName, "-")) /* Can't read stdin, because we need it to remain - positioned for the Ghostscript interpreter to read it. + positioned for the Ghostscript interpreter to read it. */ - psBb.llx = -1; + psBb.isDefined = false; else { FILE * ifP; - bool foundBb; - bool eof; ifP = pm_openr(inputFileName); - - for (foundBb = FALSE, eof = FALSE; !foundBb && !eof; ) { - char line[200]; - char * fgetsRc; - - fgetsRc = fgets(line, sizeof(line), ifP); - - if (fgetsRc == NULL) - eof = TRUE; - else { - int rc; - rc = sscanf(line, "%%%%BoundingBox: %d %d %d %d", - &psBb.llx, &psBb.lly, - &psBb.urx, &psBb.ury); - if (rc == 4) - foundBb = TRUE; - } - } - fclose(ifP); - if (!foundBb) { - psBb.llx = -1; + psBb = boundingBoxFmPostscriptFile(ifP); + + if (!psBb.isDefined) pm_message("Warning: no %%%%BoundingBox statement " "in the input or command line. " "Will use defaults"); - } } - if (psBb.llx != -1) { + if (psBb.isDefined) { if (verbose) pm_message("Using %%%%BoundingBox statement from input."); retval = psBb; - } else { + } else { /* Use the center of an 8.5" x 11" page with 1" border all around*/ + retval.isDefined = true; retval.llx = 72; retval.lly = 72; retval.urx = 540; retval.ury = 720; } } + + assert(retval.isDefined); + if (verbose) pm_message("Extracting the box ((%d,%d),(%d,%d))", retval.llx, retval.lly, retval.urx, retval.ury); @@ -503,7 +581,7 @@ computeBoxToExtract(struct Box const cmdlineExtractBox, static enum Orientation -computeOrientation(struct CmdlineInfo const cmdline, +computeOrientation(struct CmdlineInfo const cmdline, struct Box const extractBox) { /*---------------------------------------------------------------------------- The proper orientation of the image on the page, given the user's @@ -531,7 +609,7 @@ computeOrientation(struct CmdlineInfo const cmdline, /* Dimensions of image to print, in points */ unsigned int const imageWidPt = extractBox.urx - extractBox.llx; unsigned int const imageHgtPt = extractBox.ury - extractBox.lly; - + /* Dimensions of image to print, in pixels (possibly of assumed resolution) */ @@ -579,31 +657,30 @@ computeOrientation(struct CmdlineInfo const cmdline, static struct Box -addBorders(struct Box const inputBox, +addBorders(struct Box const inputBox, float const xborderScale, float const yborderScale) { /*---------------------------------------------------------------------------- Return a box which is 'inputBox' plus some borders. Add left and right borders that are the fraction 'xborderScale' of the - width of the input box; likewise for top and bottom borders with + width of the input box; likewise for top and bottom borders with 'yborderScale'. -----------------------------------------------------------------------------*/ - unsigned int const leftRightBorderSize = + unsigned int const leftRightBorderSize = ROUNDU((inputBox.urx - inputBox.llx) * xborderScale); - unsigned int const topBottomBorderSize = + unsigned int const topBottomBorderSize = ROUNDU((inputBox.ury - inputBox.lly) * yborderScale); struct Box retval; - - assert(inputBox.urx >= inputBox.llx); - assert(inputBox.ury >= inputBox.lly); + assertValidBox(inputBox); assert(inputBox.isDefined); retval.llx = inputBox.llx - (int)leftRightBorderSize; retval.lly = inputBox.lly - (int)topBottomBorderSize; retval.urx = inputBox.urx + (int)leftRightBorderSize; retval.ury = inputBox.ury + (int)topBottomBorderSize; + retval.isDefined = true; if (verbose) pm_message("With borders, extracted box is ((%d,%d),(%d,%d))", @@ -627,6 +704,8 @@ writePstrans(struct Box const box, const char * pstrans; + assert(xres > 0); assert(yres > 0); + switch (orientation) { case PORTRAIT: { int llx, lly; @@ -647,7 +726,7 @@ writePstrans(struct Box const box, if (pstrans == pm_strsol) pm_error("Unable to allocate memory for pstrans"); - if (verbose) + if (verbose) pm_message("Postscript prefix command: '%s'", pstrans); fprintf(pipeToGsP, "%s\n", pstrans); @@ -678,10 +757,10 @@ computeOutfileArg(struct CmdlineInfo const cmdline) { else { char * basename; const char * suffix; - + basename = strdup(cmdline.inputFileName); - if (strlen(basename) > 3 && - streq(basename+strlen(basename)-3, ".ps")) + if (strlen(basename) > 3 && + streq(basename+strlen(basename)-3, ".ps")) /* The input file name ends in ".ps". Chop it off. */ basename[strlen(basename)-3] = '\0'; @@ -729,7 +808,7 @@ computeGsDevice(int const formatType, static void findGhostscriptProg(const char ** const retvalP) { - + *retvalP = NULL; /* initial assumption */ if (getenv("GHOSTSCRIPT")) *retvalP = strdup(getenv("GHOSTSCRIPT")); @@ -739,7 +818,7 @@ findGhostscriptProg(const char ** const retvalP) { const char * candidate; pathwork = strdup(getenv("PATH")); - + candidate = strtok(pathwork, ":"); *retvalP = NULL; @@ -773,7 +852,7 @@ findGhostscriptProg(const char ** const retvalP) { static void execGhostscript(int const inputPipeFd, char const ghostscriptDevice[], - char const outfileArg[], + char const outfileArg[], struct Dimensions const pageDim, unsigned int const textalphabits) { /*---------------------------------------------------------------------------- @@ -791,12 +870,11 @@ execGhostscript(int const inputPipeFd, const char * gopt; const char * ropt; const char * textalphabitsopt; - int rc; findGhostscriptProg(&ghostscriptProg); /* Put the input pipe on Standard Input */ - rc = dup2(inputPipeFd, STDIN_FILENO); + dup2(inputPipeFd, STDIN_FILENO); close(inputPipeFd); pm_asprintf(&arg0, "gs"); @@ -817,13 +895,13 @@ execGhostscript(int const inputPipeFd, "'%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s'", ghostscriptProg, arg0, deviceopt, outfileopt, gopt, ropt, textalphabitsopt, - "-q", "-dNOPAUSE", + "-q", "-dNOPAUSE", "-dSAFER", "-"); } execl(ghostscriptProg, arg0, deviceopt, outfileopt, gopt, ropt, textalphabitsopt, "-q", "-dNOPAUSE", "-dSAFER", "-", NULL); - + pm_error("execl() of Ghostscript ('%s') failed, errno=%d (%s)", ghostscriptProg, errno, strerror(errno)); } @@ -852,26 +930,26 @@ feedPsToGhostScript(const char * const inputFileName, bool eof; /* End of file on input */ pipeToGsP = fdopen(pipeToGhostscriptFd, "w"); - if (pipeToGsP == NULL) + if (pipeToGsP == NULL) pm_error("Unable to open stream on pipe to Ghostscript process."); - + ifP = pm_openr(inputFileName); /* In encapsulated Postscript, we the encapsulator are supposed to handle showing the page (which we do by passing a showpage - statement to Ghostscript). Any showpage statement in the + statement to Ghostscript). Any showpage statement in the input must be defined to have no effect. - + See "Enscapsulated PostScript Format File Specification", v. 3.0, 1 May 1992, in particular Example 2, p. 21. I found - it at + it at http://partners.adobe.com/asn/developer/pdfs/tn/5002.EPSF_Spec.pdf The example given is a much fancier solution than we need - here, I think, so I boiled it down a bit. JM + here, I think, so I boiled it down a bit. JM */ if (language == ENCAPSULATED_POSTSCRIPT) fprintf(pipeToGsP, "\n/b4_Inc_state save def /showpage { } def\n"); - + writePstrans(borderedBox, imageDim, orientation, pipeToGsP); /* If our child dies, it closes the pipe and when we next write to it, @@ -884,11 +962,11 @@ feedPsToGhostScript(const char * const inputFileName, while (!eof) { char buffer[4096]; size_t readCt; - + readCt = fread(buffer, 1, sizeof(buffer), ifP); - if (readCt == 0) + if (readCt == 0) eof = TRUE; - else + else fwrite(buffer, 1, readCt, pipeToGsP); } pm_close(ifP); @@ -897,7 +975,7 @@ feedPsToGhostScript(const char * const inputFileName, fprintf(pipeToGsP, "\nb4_Inc_state restore showpage\n"); fclose(pipeToGsP); -} +} @@ -940,7 +1018,7 @@ executeGhostscript(char const inputFileName[], struct Dimensions const imageDim, enum Orientation const orientation, char const ghostscriptDevice[], - char const outfileArg[], + char const outfileArg[], unsigned int const textalphabits, enum PostscriptLanguage const language) { @@ -949,12 +1027,12 @@ executeGhostscript(char const inputFileName[], if (strlen(outfileArg) > 80) pm_error("output file spec too long."); - + rc = pm_pipe(pipefd); if (rc < 0) pm_error("Unable to create pipe to talk to Ghostscript process. " "errno = %d (%s)", errno, strerror(errno)); - + rc = fork(); if (rc < 0) pm_error("Unable to fork a Ghostscript process. errno=%d (%s)", @@ -986,13 +1064,13 @@ executeGhostscript(char const inputFileName[], if (gsTermStatus != 0) { if (WIFEXITED(gsTermStatus)) - pm_error("Ghostscript failed. Exit code=%d\n", + pm_error("Ghostscript failed. Exit code=%d\n", WEXITSTATUS(gsTermStatus)); else if (WIFSIGNALED(gsTermStatus)) pm_error("Ghostscript process died because of a signal %d.", WTERMSIG(gsTermStatus)); - else - pm_error("Ghostscript process died with exit code %d", + else + pm_error("Ghostscript process died with exit code %d", gsTermStatus); } } @@ -1010,7 +1088,7 @@ main(int argc, char ** argv) { /* Size and resolution of the input image */ struct Box extractBox; /* coordinates of the box within the input we are to extract; i.e. - that will become the output. + that will become the output. */ struct Box borderedBox; /* Same as above, but expanded to include borders */ @@ -1031,32 +1109,31 @@ main(int argc, char ** argv) { extractBox = computeBoxToExtract(cmdline.extractBox, inputFileName); language = languageDeclaration(inputFileName); - + orientation = computeOrientation(cmdline, extractBox); borderedBox = addBorders(extractBox, cmdline.xborder, cmdline.yborder); + assertValidBox(borderedBox); assert(borderedBox.isDefined); + computeSizeRes(cmdline, borderedBox, &imageDim); - if (imageDim.xres == 0) - imageDim.xres = 1; - if (imageDim.yres == 0) - imageDim.yres = 1; - + assert(imageDim.xres > 0); assert(imageDim.yres > 0); + outfileArg = computeOutfileArg(cmdline); - ghostscriptDevice = + ghostscriptDevice = computeGsDevice(cmdline.formatType, cmdline.forceplain); - + pm_message("Writing %s format", ghostscriptDevice); - + executeGhostscript(inputFileName, borderedBox, imageDim, orientation, ghostscriptDevice, outfileArg, cmdline.textalphabits, language); pm_strfree(ghostscriptDevice); pm_strfree(outfileArg); - + return 0; } |