diff options
Diffstat (limited to 'lib/libpgm1.c')
| -rw-r--r-- | lib/libpgm1.c | 221 |
1 files changed, 131 insertions, 90 deletions
diff --git a/lib/libpgm1.c b/lib/libpgm1.c index 75fa365b..4d93e4be 100644 --- a/lib/libpgm1.c +++ b/lib/libpgm1.c @@ -10,7 +10,7 @@ ** implied warranty. */ -/* See libpbm.c for the complicated explanation of this 32/64 bit file +/* See pmfileio.c for the complicated explanation of this 32/64 bit file offset stuff. */ #define _FILE_OFFSET_BITS 64 @@ -28,6 +28,7 @@ #include "libpam.h" #include "fileio.h" #include "mallocvar.h" +#include "nstring.h" gray * @@ -49,13 +50,14 @@ void pgm_init(int * const argcP, char ** const argv) { - pbm_init( argcP, argv ); + pbm_init(argcP, argv); } void -pgm_nextimage(FILE * const file, int * const eofP) { +pgm_nextimage(FILE * const file, + int * const eofP) { pm_nextimage(file, eofP); } @@ -121,11 +123,6 @@ pgm_readpgminit(FILE * const fileP, /* Check magic number. */ realFormat = pm_readmagicnumber(fileP); switch (PAM_FORMAT_TYPE(realFormat)) { - case PGM_TYPE: - *formatP = realFormat; - pgm_readpgminitrest(fileP, colsP, rowsP, maxvalP); - break; - case PBM_TYPE: *formatP = realFormat; pbm_readpbminitrest(fileP, colsP, rowsP); @@ -149,6 +146,15 @@ pgm_readpgminit(FILE * const fileP, *maxvalP = PGM_MAXMAXVAL; break; + case PGM_TYPE: + *formatP = realFormat; + pgm_readpgminitrest(fileP, colsP, rowsP, maxvalP); + break; + + case PPM_TYPE: + pm_error("Input file is a PPM, which this program cannot process. " + "You may want to convert it to PGM with 'ppmtopgm'"); + case PAM_TYPE: pnm_readpaminitrestaspnm(fileP, colsP, rowsP, maxvalP, formatP); @@ -158,40 +164,106 @@ pgm_readpgminit(FILE * const fileP, break; default: - pm_error("bad magic number - not a pgm or pbm file"); + pm_error("bad magic number - not a Netpbm file"); } validateComputableSize(*colsP, *rowsP); } -gray -pgm_getrawsample(FILE * const file, - gray const maxval) { +static void +readRpgmRow(FILE * const fileP, + gray * const grayrow, + int const cols, + gray const maxval, + int const format) { + + unsigned int const bytesPerSample = maxval < 256 ? 1 : 2; + int const bytesPerRow = cols * bytesPerSample; + + unsigned char * rowBuffer; + const char * error; + + MALLOCARRAY(rowBuffer, bytesPerRow); + if (rowBuffer == NULL) + asprintfN(&error, "Unable to allocate memory for row buffer " + "for %u columns", cols); + else { + ssize_t rc; + rc = fread(rowBuffer, 1, bytesPerRow, fileP); + if (rc == 0) + asprintfN(&error, "Error reading row. fread() errno=%d (%s)", + errno, strerror(errno)); + else if (rc != bytesPerRow) + asprintfN(&error, "Error reading row. Short read of %u bytes " + "instead of %u", rc, bytesPerRow); + else { + error = NULL; + if (maxval < 256) { + unsigned int col; + for (col = 0; col < cols; ++col) + grayrow[col] = (gray)rowBuffer[col]; + } else { + unsigned int bufferCursor; + unsigned int col; + + bufferCursor = 0; /* Start at beginning of rowBuffer[] */ + + for (col = 0; col < cols; ++col) { + gray g; + + g = rowBuffer[bufferCursor++] << 8; + g |= rowBuffer[bufferCursor++]; + + grayrow[col] = g; + } + } + } + free(rowBuffer); + } + if (error) { + pm_errormsg("%s", error); + strfree(error); + pm_longjmp(); + } +} + + - if (maxval < 256) { - /* The sample is just one byte. Read it. */ - return(pm_getrawbyte(file)); +static void +readPbmRow(FILE * const fileP, + gray * const grayrow, + int const cols, + gray const maxval, + int const format) { + + jmp_buf jmpbuf; + jmp_buf * origJmpbufP; + bit * bitrow; + + bitrow = pbm_allocrow(cols); + if (setjmp(jmpbuf) != 0) { + pbm_freerow(bitrow); + pm_setjmpbuf(origJmpbufP); + pm_longjmp(); } else { - /* The sample is two bytes. Read both. */ - unsigned char byte_pair[2]; - size_t pairs_read; - - pairs_read = fread(&byte_pair, 2, 1, file); - if (pairs_read == 0) - pm_error("EOF /read error while reading a long sample"); - /* This could be a few instructions faster if exploited the internal - format (i.e. endianness) of a pixval. Then we might be able to - skip the shifting and oring. - */ - return((byte_pair[0]<<8) | byte_pair[1]); + unsigned int col; + + pm_setjmpbufsave(&jmpbuf, &origJmpbufP); + + pbm_readpbmrow(fileP, bitrow, cols, format); + for (col = 0; col < cols; ++col) + grayrow[col] = (bitrow[col] == PBM_WHITE ) ? maxval : 0; + + pm_setjmpbuf(origJmpbufP); } + pbm_freerow(bitrow); } void -pgm_readpgmrow(FILE * const file, +pgm_readpgmrow(FILE * const fileP, gray * const grayrow, int const cols, gray const maxval, @@ -201,7 +273,7 @@ pgm_readpgmrow(FILE * const file, case PGM_FORMAT: { unsigned int col; for (col = 0; col < cols; ++col) { - grayrow[col] = pm_getuint(file); + grayrow[col] = pm_getuint(fileP); if (grayrow[col] > maxval) pm_error("value out of bounds (%u > %u)", grayrow[col], maxval); @@ -209,86 +281,56 @@ pgm_readpgmrow(FILE * const file, } break; - case RPGM_FORMAT: { - unsigned int const bytesPerSample = maxval < 256 ? 1 : 2; - int const bytesPerRow = cols * bytesPerSample; - - unsigned char * rowBuffer; - ssize_t rc; - - MALLOCARRAY(rowBuffer, bytesPerRow); - if (rowBuffer == NULL) - pm_error("Unable to allocate memory for row buffer " - "for %u columns", cols); - - rc = fread(rowBuffer, 1, bytesPerRow, file); - if (rc == 0) - pm_error("Error reading row. fread() errno=%d (%s)", - errno, strerror(errno)); - else if (rc != bytesPerRow) - pm_error("Error reading row. Short read of %u bytes " - "instead of %u", rc, bytesPerRow); - - if (maxval < 256) { - unsigned int col; - for (col = 0; col < cols; ++col) - grayrow[col] = (gray)rowBuffer[col]; - } else { - unsigned int bufferCursor; - unsigned int col; - - bufferCursor = 0; /* Start at beginning of rowBuffer[] */ - - for (col = 0; col < cols; ++col) { - gray g; - - g = rowBuffer[bufferCursor++] << 8; - g |= rowBuffer[bufferCursor++]; - - grayrow[col] = g; - } - } - free(rowBuffer); - } + case RPGM_FORMAT: + readRpgmRow(fileP, grayrow, cols, maxval, format); break; case PBM_FORMAT: - case RPBM_FORMAT: { - bit * bitrow; - int col; - - bitrow = pbm_allocrow(cols); - pbm_readpbmrow( file, bitrow, cols, format ); - for (col = 0; col < cols; ++col) - grayrow[col] = (bitrow[col] == PBM_WHITE ) ? maxval : 0; - pbm_freerow(bitrow); - } + case RPBM_FORMAT: + readPbmRow(fileP, grayrow, cols, maxval, format); break; default: - pm_error( "can't happen" ); + pm_error("can't happen"); } } gray ** -pgm_readpgm(FILE * const file, +pgm_readpgm(FILE * const fileP, int * const colsP, int * const rowsP, gray * const maxvalP) { - gray** grays; - int row; + gray ** grays; + int rows, cols; + gray maxval; int format; + jmp_buf jmpbuf; + jmp_buf * origJmpbufP; - pgm_readpgminit( file, colsP, rowsP, maxvalP, &format ); + pgm_readpgminit(fileP, &cols, &rows, &maxval, &format); - grays = pgm_allocarray( *colsP, *rowsP ); - - for ( row = 0; row < *rowsP; ++row ) - pgm_readpgmrow( file, grays[row], *colsP, *maxvalP, format ); + grays = pgm_allocarray(cols, rows); + + if (setjmp(jmpbuf) != 0) { + pgm_freearray(grays, rows); + pm_setjmpbuf(origJmpbufP); + pm_longjmp(); + } else { + unsigned int row; + pm_setjmpbufsave(&jmpbuf, &origJmpbufP); + + for (row = 0; row < rows; ++row) + pgm_readpgmrow(fileP, grays[row], cols, maxval, format); + + pm_setjmpbuf(origJmpbufP); + } + *colsP = cols; + *rowsP = rows; + *maxvalP = maxval; return grays; } @@ -319,6 +361,5 @@ pgm_check(FILE * const file, pm_filepos const need_raster_size = rows * bytes_per_row; pm_check(file, check_type, need_raster_size, retval_p); - } } |