Create Subversion repository

git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@1 9d0c8265-081b-0410-96cb-a4ca84ce46f8

1 files changed, 222 insertions, 0 deletions

diff --git a/lib/libpnm1.c b/lib/libpnm1.c
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+++ b/lib/libpnm1.c
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+/* libpnm1.c - pnm utility library part 1
+**
+** Copyright (C) 1989 by Jef Poskanzer.
+**
+** Permission to use, copy, modify, and distribute this software and its
+** documentation for any purpose and without fee is hereby granted, provided
+** that the above copyright notice appear in all copies and that both that
+** copyright notice and this permission notice appear in supporting
+** documentation.  This software is provided "as is" without express or
+** implied warranty.
+*/
+
+#include <string.h>
+#include <errno.h>
+
+#include "pnm.h"
+
+#include "ppm.h"
+#include "libppm.h"
+
+#include "pgm.h"
+#include "libpgm.h"
+
+#include "pbm.h"
+#include "libpbm.h"
+
+#include "pam.h"
+#include "libpam.h"
+
+#include "mallocvar.h"
+
+
+
+xel *
+pnm_allocrow(unsigned int const cols) {
+
+    xel * xelrow;
+
+    MALLOCARRAY(xelrow, cols);
+
+    if (xelrow == NULL)
+        pm_error("Unable to allocate space for a %u-column xel row", cols);
+
+    return xelrow;
+}
+
+
+
+void
+pnm_init( argcP, argv )
+    int* argcP;
+    char* argv[];
+    {
+    ppm_init( argcP, argv );
+    }
+
+void
+pnm_nextimage(FILE *file, int * const eofP) {
+    pm_nextimage(file, eofP);
+}
+
+
+
+static void
+validateComputableSize(unsigned int const cols,
+                       unsigned int const rows) {
+/*----------------------------------------------------------------------------
+   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.
+
+   A common operation is adding 1 or 2 to the highest row or
+   column number in the image, so we make sure that's possible.
+-----------------------------------------------------------------------------*/
+    if (cols > INT_MAX - 2)
+        pm_error("image width (%u) too large to be processed", cols);
+    if (rows > INT_MAX - 2)
+        pm_error("image height (%u) too large to be processed", rows);
+}
+
+
+
+void
+pnm_readpnminit(FILE *   const fileP,
+                int *    const colsP,
+                int *    const rowsP,
+                xelval * const maxvalP,
+                int *    const formatP) {
+
+    int realFormat;
+
+    /* Check magic number. */
+    realFormat = pm_readmagicnumber(fileP);
+    switch (PAM_FORMAT_TYPE(realFormat)) {
+    case PPM_TYPE: {
+        pixval maxval;
+        *formatP = realFormat;
+        ppm_readppminitrest(fileP, colsP, rowsP, &maxval);
+        *maxvalP = maxval;
+    }
+    break;
+
+    case PGM_TYPE: {
+        gray maxval;
+
+        *formatP = realFormat;
+        pgm_readpgminitrest(fileP, colsP, rowsP, &maxval);
+        *maxvalP = maxval;
+    }
+    break;
+
+    case PBM_TYPE:
+        *formatP = realFormat;
+        pbm_readpbminitrest(fileP, colsP, rowsP);
+        *maxvalP = 1;
+    break;
+
+    case PAM_TYPE: {
+        gray maxval;
+        pnm_readpaminitrestaspnm(fileP, colsP, rowsP, &maxval, formatP);
+        *maxvalP = maxval;
+    }
+    break;
+
+    default:
+        pm_error("bad magic number - not a ppm, pgm, or pbm file");
+    }
+    validateComputableSize(*colsP, *rowsP);
+}
+
+
+
+void
+pnm_readpnmrow(FILE * const fileP,
+               xel *  const xelrow,
+               int    const cols,
+               xelval const maxval,
+               int    const format) {
+
+    switch (PNM_FORMAT_TYPE(format)) {
+    case PPM_TYPE:
+        ppm_readppmrow(fileP, (pixel*) xelrow, cols, (pixval) maxval, format);
+        break;
+
+    case PGM_TYPE: {
+        gray * grayrow;
+        unsigned int col;
+
+        grayrow = pgm_allocrow(cols);
+        pgm_readpgmrow(fileP, grayrow, cols, (gray) maxval, format);
+        for (col = 0; col < cols; ++col)
+            PNM_ASSIGN1(xelrow[col], grayrow[col]);
+        pgm_freerow(grayrow);
+    }
+    break;
+        
+    case PBM_TYPE: {
+        bit * bitrow;
+        unsigned int col;
+        bitrow = pbm_allocrow(cols);
+        pbm_readpbmrow(fileP, bitrow, cols, format);
+        for (col = 0; col < cols; ++col)
+            PNM_ASSIGN1(xelrow[col], bitrow[col] == PBM_BLACK ? 0: maxval);
+        pbm_freerow(bitrow);
+    }
+    break;
+
+    default:
+        pm_error("INTERNAL ERROR.  Impossible format.");
+    }
+}
+
+
+
+xel **
+pnm_readpnm(FILE *   const fileP,
+            int *    const colsP,
+            int *    const rowsP,
+            xelval * const maxvalP,
+            int *    const formatP) {
+
+    xel ** xels;
+    int row;
+
+    pnm_readpnminit(fileP, colsP, rowsP, maxvalP, formatP);
+
+    xels = pnm_allocarray(*colsP, *rowsP);
+
+    for (row = 0; row < *rowsP; ++row)
+        pnm_readpnmrow(fileP, xels[row], *colsP, *maxvalP, *formatP);
+
+    return xels;
+}
+
+
+
+void
+pnm_check(FILE *               const fileP,
+          enum pm_check_type   const check_type, 
+          int                  const format,
+          int                  const cols,
+          int                  const rows,
+          int                  const maxval,
+          enum pm_check_code * const retvalP) {
+
+    switch (PNM_FORMAT_TYPE(format)) {
+    case PBM_TYPE:
+        pbm_check(fileP, check_type, format, cols, rows, retvalP);
+        break;
+    case PGM_TYPE: 
+        pgm_check(fileP, check_type, format, cols, rows, maxval, retvalP);
+        break;
+    case PPM_TYPE:
+        ppm_check(fileP, check_type, format, cols, rows, maxval, retvalP);
+        break;
+    default:
+        pm_error("pnm_check() called with invalid format parameter");
+    }
+}